DATA SHEET AAT3221/AAT3222: 150 mA NanopowerTM LDO Linear Regulator Applications Description • Cellular phones The AAT3221 and AAT3222 NanoPower™ Low Drop Out (LDO) linear regulators are ideal for portable applications where • Digital cameras extended battery life is critical. These devices feature extremely • Handheld electronics low quiescent current, typically 1.1 µA. Dropout voltage is also • Notebook computers very low, typically less than 200 mV at the maximum output current of 150 mA. The AAT3221/3222 have an enable pin which, • PDAs when asserted, places the LDO regulator into shutdown mode, • Portable communication devices removing power from its load and offering extended power • Remote controls conservation capabilities for portable battery-powered applications. The AAT3221/3222 have output short-circuit and over-current Features protection. In addition, the devices also have an over-temperature • Quiescent current: 1.1 µA protection circuit that shuts down the LDO regulator during • Low dropout: 200 mV (typical) extended over-current events. Both devices are available with active high or active low enable input. • Guaranteed output: 150 mA The AAT3221 and AAT3222 are available in Pb-free, space-saving • High accuracy: ±2% 5-pin SOT23 packages. The AAT3221 is also available in a • Current limit protection Pb-free, 8-pin SC70JW package. Since only a small, 1 µF • Over-temperature protection ceramic output capacitor is recommended, often the only space used is that occupied by the AAT3221 or AAT3222. The • Extremely low power shutdown mode AAT3221/3222 provide a compact and cost-effective voltage • Low temperature coefficient conversion solution. • Factory-programmed output voltages: 1.5 V to 3.5 V Both devices are similar to the AAT3220, with the exception that • Stable operation with virtually any output capacitor type they offer further power savings with an enable pin. • Active high or low enable pin A typical application circuit is shown in Figure 1. The pin configuration is shown in Figures 2, 3, and 4. Signal pin • Small, 5-pin SOT23 or 8-pin SC70JW (AAT3221 only) package assignments and functional pin descriptions are provided in (MSL1, 260 °C per JEDEC-J-STD-020) Table 1. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 1

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Figure 1. AAT3221/3222 Typical Application Circuit Figure 4. AAT3222 Pinout Figure 2. AAT3221 Pinout Figure 3. AAT3221 Pinout 5-Pin SOT23-5 (Top View) 5-Pin SOT23-5 (Top View) 8-Pin SC70JW-8 (Top View) Table 1. AAT3221/3222 Signal Descriptions Pin # AAT3221 Name Description AAT3222 SOT23-5 SC70JW-8 1 2 2 IN Input pin. 2 5, 6, 7, 8 1 GND Ground connection pin. EN(EN) Enable input. Logic compatible enable with active high or active low option 3 4 5 available; see Ordering Information and Applications Information for details. 4 3 4 NC Not connected. 5 1 3 OUT Output pin; should be decoupled with 1 µF or greater capacitor. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 2 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Electrical and Mechanical Specifications Typical performance characteristics of the AAT3221/3222 are illustrated in Figures 5 through 22. The absolute maximum ratings of the AAT3221/3222 are provided in Table 2. The recommended operating conditions are specified in Table 3, and electrical specifications are provided in Table 4. Table 2. AAT3221/3222 Absolute Maximum Ratings (Note 1) Parameter Symbol Minimum Typical Maximum Units Input Voltage, <30 ms, 10% DC (continuous max. = 6.0 V) VIN –0.3 +7 V EN(EN) to GND Voltage VEN –0.3 +6 V Maximum EN(EN) to Input Voltage VENIN(MAX) 0.3 V Maximum DC Output Current IOUT PD/(VIN – VO) mA Operating Junction Temperature Range TJ –40 +150 ºC Thermal Resistance (Note 2) θJA SOT23-5 150 ºC/W SC70JW-8 160 ºC/W Power Dissipation (Note 2) PD SOT23-5 667 mW SC70JW-8 625 mW Electrostatic Discharge: ESD 4000 V Human Body Model, Class 3A Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device. Note 2: Support IN high voltage pulse up to 7 V lasting 8 µs. CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. Table 3. AAT3221/3222 Recommended Operating Conditions Parameter Symbol Minimum Typical Maximum Units Input voltage (Note 1) VIN (VOUT + VDO) 5.5 V Ambient temperature range TA –40 +85 °C Note 1: To calculate minimum input voltage, use the following equation: VIN(MIN) = VOUT(MAX) + VDO(MAX) as long as VIN ≥ 2.5 V. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 3

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Table 4. AAT3221/3222 Electrical Specifications (1 of 2) (Note 1) (VIN = VOUT(NOM) + 1 V, IOUT = 1 mA, COUT = 1 µF, TA = 25 °C, Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units DC output voltage tolerance VOUT –2.0 +2.0 % Output current IOUT VOUT > 1.2 V 150 mA Short-circuit current ISC VOUT < 0.4 V 350 mA Ground current IQ VIN = 5 V, no load 1.1 2.5 µA Shutdown current ISD EN = inactive 20 nA Line regulation ∆Vout/Vout Х ∆Vin VIN = 4.0 V to 5.5 V 0.15 0.4 %/V VOUT = 1.5 1.3 1.72 VOUT = 1.6 1.2 1.69 VOUT = 1.7 1.1 1.67 VOUT = 1.8 1.0 1.65 VOUT = 1.9 1.0 1.62 VOUT = 2.0 0.9 1.58 VOUT = 2.3 0.8 1.45 VOUT = 2.4 0.8 1.40 VOUT = 2.5 0.8 1.35 Load regulation ∆VOUT/VOUT IOUT = 1 to 100 mA % VOUT = 2.6 0.8 1.30 VOUT = 2.7 0.7 1.25 VOUT = 2.8 0.7 1.20 VOUT = 2.85 0.7 1.20 VOUT = 2.9 0.7 1.18 VOUT = 3.0 0.6 1.15 VOUT = 3.1 0.6 1.06 VOUT = 3.3 0.5 1.00 VOUT = 3.5 0.5 1.00 VOUT = 2.3 230 275 VOUT = 2.4 220 265 VOUT = 2.5 210 255 VOUT = 2.6 205 247 VOUT = 2.7 200 240 VOUT = 2.8 190 235 Dropout voltage (Note 2, 3) VDO IOUT = 100 mA mV VOUT = 2.85 190 230 VOUT = 2.9 190 228 VOUT = 3.0 190 225 VOUT = 3.1 188 222 VOUT = 3.3 180 220 VOUT = 3.5 180 220 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 4 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Table 4. AAT3221/3222 Electrical Specifications (2 of 2) (Note 1) (VIN = VOUT(NOM) + 1 V, IOUT = 1 mA, COUT = 1 µF, TA = 25 °C, Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units EN Input low voltage VEN(L) 0.8 V VIN = 2.7 V to 3.6 V 2.0 EN Input high voltage VEN(H) V VIN = 5 V 2.4 EN Input leakage IEN(SINK) VON = 5.5 V 0.01 1 µA Power supply rejection ratio PSRR @ 100 HZ 50 dB Over-temperature shutdown threshold TSD 140 ºC Over-temperature shutdown hysteresis THYS 20 ºC Output noise eN f = 10 Hz to 10 kHz 350 µVRMS Output voltage temperature coefficient TC 80 PPM/°C Note 1: Performance is guaranteed only under the conditions listed in this Table. Note 2: VDO is defined as VIN - VOUT when VOUT is 98% of nominal. Note 3: For VOUT < 2.3 V, VDO = 2.5 V – VOUT. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 5

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Typical Performance Characteristics (VIN = VOUT + 1 V, TA = 25 °C, COUT = 5.6 µF Ceramic, IOUT = 1 mA, Unless Otherwise Noted) Figure 5. Output Voltage vs Output Current Figure 6. Output Voltage vs Input Voltage Figure 7. Output Voltage vs Input Voltage Figure 8. Dropout Voltage vs Output Current Figure 9. Supply Current vs Input Voltage Figure 10. PSRR with 10 mA Load Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 6 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Typical Performance Characteristics (VIN = VOUT + 1 V, TA = 25 °C, COUT = 5.6 µF Ceramic, IOUT = 1 mA, Unless Otherwise Noted) Figure 11. Noise Spectrum Figure 12. Line Response with 1 mA Load Figure 13. Line Response with 10 mA Load Figure 14. Line Response with 100 mA Load Figure 15. Load Transient – 1 mA/40 mA Figure 16. Load Transient – 1 mA/80 mA Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 7

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Typical Performance Characteristics (VIN = VOUT + 1 V, TA = 25 °C, COUT = 5.6 µF Ceramic, IOUT = 1 mA, Unless Otherwise Noted) Figure 17. Power-Up with 1 mA Load Figure 18. Turn-On with 1 mA Load Figure 19. Power-Up with 10 mA Load Figure 20. Turn-On with 10 mA Load Figure 21. Power-Up with 100 mA Load Figure 22. Turn-On with 100 mA Load Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 8 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Figure 23. AAT3221/3222 Functional Block Diagram Functional Description thermal dissipation properties. Refer to the Thermal Considerations and High Output Current Applications section of The AAT3221 and AAT3222 are intended for LDO regulator this document for details on device operation at maximum output applications where output current load requirements range from load levels. no load to 150 mA. The advanced circuit design of the AAT3221/3222 has been optimized for very low quiescent or ground current consumption, making these devices ideal for use Application Information in power management systems for small battery-operated To ensure that the maximum possible performance is obtained devices. from the AAT3221 or AAT3222, please refer to the following The typical quiescent current level is just 1.1 µA. Both devices application recommendations. also contain an enable circuit that has been provided to shut down the LDO regulator for additional power conservation in Input Capacitor portable products. In the shutdown state, the LDO draws less than A 1 µF or larger capacitor is typically recommended for CIN in 1 µA from the input supply. most applications. A CIN capacitor is not required for basic LDO The LDO also demonstrates excellent Power Supply Ripple regulator operation. However, if the AAT3221/3222 are physically Rejection (PSRR), and load and line transient response located more than one or two centimeters from the input power characteristics. The AAT3221/3222 high performance LDO source, a CIN capacitor is needed for stable operation. CIN should regulators are especially well suited for circuit applications that be located as closely to the device VIN pin as practically possible. are sensitive to load circuit power consumption and extended CIN values greater than 1 µF offer superior input line transient battery life. response and helps to maximize the power supply ripple The LDO regulator output has been specifically optimized to rejection. function with low-cost, low Equivalent Series Resistance (ESR) Ceramic, tantalum, or aluminum electrolytic capacitors may be ceramic capacitors. However, the design allows for operation with selected for CIN, as there is no specific capacitor ESR a wide range of capacitor types. requirement. For 150 mA LDO regulator output operation, ceramic The AAT3221/3222 have complete short-circuit and thermal capacitors are recommended for CIN due to their inherent protection. The integral combination of these two internal capability over tantalum capacitors to withstand input current protection circuits gives each device a comprehensive safety surges from low impedance sources such as batteries in portable system to guard against extreme adverse operating conditions. devices. Device power dissipation is limited to the package type and Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 9

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Output Capacitor Equivalent Series Resistance (ESR) For proper load voltage regulation and operational stability, a ESR is a very important characteristic to consider when selecting capacitor is required between pins VOUT and GND. The COUT a capacitor. ESR is the internal series resistance associated with capacitor connection to the LDO regulator ground pin should be a capacitor, which includes lead resistance, internal connections, made as direct as practically possible for maximum device capacitor size and area, material composition, and ambient performance. temperature. Typically, capacitor ESR is measured in milliOhms for ceramic capacitors and can range to more than several Ohms The AAT3221/3222 have been specifically designed to function for tantalum or aluminum electrolytic capacitors. with very low ESR ceramic capacitors. Although the devices are intended to operate with these low ESR capacitors, they are Ceramic Capacitor Materials stable over a wide range of capacitor ESRs. Therefore, they can also work with some higher ESR tantalum or aluminum Ceramic capacitors less than 0.1 µF are typically made from NPO electrolytic capacitors. However, for best performance, ceramic or C0G materials. NPO and C0G materials have a typically tight capacitors are recommended. tolerance and are very stable over temperature ranges. Larger capacitor values are typically composed of X7R, X5R, Z5U, and The value of COUT typically ranges from 0.47 µF to 10 µF; Y5V dielectric materials. Large ceramic capacitors, typically however, 1 µF is sufficient for most operating conditions. greater than 2.2 µF, are often available in low-cost Y5V and Z5U If large output current steps are required by an application, then dielectrics. These two material types are not recommended for an increased value for COUT should be considered. The amount of use with LDO regulators since the capacitor tolerance can vary capacitance needed can be calculated from the step size of the more than ±50% over the operating temperature range of the change in output load current expected and the voltage excursion device. that the load can tolerate. A 2.2 µF, Y5V capacitor could be reduced to 1 µF over the full The total output capacitance required can be calculated using the operating temperature range. This can cause problems for circuit following formula: operation and stability. X7R and X5R dielectrics are much more desirable. The temperature tolerance of X7R dielectric is better than ±15%. Where: Capacitor area is another contributor to ESR. Capacitors that are physically large in size have a lower ESR when compared to a ∆I = maximum step of output current smaller sized capacitor of equivalent material and capacitance ∆V = maximum excursion voltage that the load can tolerate value. These larger devices can also improve circuit transient Note that use of this equation results in capacitor values response when compared to an equal value capacitor in a smaller approximately two to four times the typical value needed for an package size. AAT3221 or AAT3222 at room temperature. The increased Consult capacitor vendor Data Sheets carefully when selecting capacitor value is recommended if tight output tolerances must capacitors for use with LDO regulators. be maintained over extreme operating conditions and maximum operational temperature excursions. If tantalum or aluminum Enable Function electrolytic capacitors are used, the capacitor value should be The AAT3221/3222 devices feature an LDO regulator increased to compensate for the substantial ESR inherent to these enable/disable function. This pin (EN) is compatible with CMOS capacitor types. logic. Active high or active low options are available (see Ordering Information). Capacitor Characteristics For a logic high signal, the EN control level must be greater than Ceramic composition capacitors are highly recommended over all 2.4 V. A logic low signal is asserted when the voltage on the EN other types of capacitors for use with the AAT3221/3222. pin falls below 0.8 V. For example, the active high versions of the Ceramic capacitors offer many advantages over their tantalum AAT3221 and AAT3222 turns on when a logic high is applied to and aluminum electrolytic counterparts. A ceramic capacitor the EN pin. If the enable function is not needed in a specific typically has a very low ESR, a lower cost, a smaller PCB application, it may be tied to the respective voltage level to keep footprint, and is non-polarized. Line and load transient response the LDO regulator in a continuously “on” state (e.g., the active of the LDO regulator is improved by using low-ESR ceramic high version AAT3221/3222 can tie VIN to EN to remain on). capacitors. Since ceramic capacitors are non-polarized, they are less prone to damage if incorrectly connected. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 10 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Constants for the AAT3221/3222 are TJ(MAX), the maximum Short-Circuit Protection and Thermal Protection junction temperature for the device, which is 125 °C, and The AAT3221/2 is protected by both current limit and over- QJA = 150 °C/W, the package thermal resistance. Typically, the temperature protection circuitry. The internal short-circuit current maximum package power is calculated at the maximum operating limit is designed to activate when the output load demand temperature where TA = 85 °C, and under normal ambient exceeds the maximum rated output. conditions TA = 25 °C. Given TA = 85 °C, the maximum package If a short-circuit condition was to continually draw more than the power dissipation is 267 mW. At TA = 25 °C, the maximum package power dissipation is 667 mW. current limit threshold, the LDO regulator output voltage drops to a level necessary to supply the current demanded by the load. The maximum continuous output current for the AAT3221/3222 is Under short-circuit or other over-current operating conditions, the a function of the package power dissipation and the input-to- output voltage drops and the device die temperature rapidly output voltage drop across the LDO regulator. Refer to the increases. following simple equation: Once the regulator’s power dissipation capacity is exceeded and the internal die temperature reaches approximately 140 °C, the system thermal protection circuit becomes active. The internal thermal protection circuit actively turns off the LDO regulator For example, if VIN = 5 V, VOUT = 2.5 V and TA = 25 °C, output pass device to prevent the possibility of over-temperature IOUT(MAX) < 267 mA. The output short-circuit protection threshold damage. The LDO regulator output remains in a shutdown state is set between 150 mA and 300 mA. If the output load current until the internal die temperature falls back below the 140 °C trip were to exceed 267 mA or if the ambient temperature were to point. increase, the internal die temperature would increase. If the condition remained constant and the short-circuit protection did The interaction between the short-circuit and thermal protection not activate, there would be a potential damage hazard to the systems allows the LDO regulator to withstand indefinite short- LDO regulator since the thermal protection circuit would only circuit conditions without sustaining permanent damage. activate after a short-circuit event occurred on the LDO regulator output. No-Load Stability To determine the maximum input voltage for a given load current, The AAT3221 and AAT3222 are designed to maintain output refer to the following equation. This calculation accounts for the voltage regulation and stability under operational no-load total power dissipation of the LDO regulator, including that caused conditions. This is an important characteristic for applications by ground current. where the output current may drop to zero. An output capacitor is required for stability under no-load operating conditions. Refer to the Output Capacitor section of this This formula can be solved for VIN to determine the maximum document for recommended typical output capacitor values. input voltage. Thermal Considerations and High Output Current Applications The AAT3221/3222 are designed to deliver a continuous output The following is an example of the AAT3221 or AAT3222 set for a load current of 150 mA under normal operating conditions. The 2.5 V output: limiting characteristic for the maximum output load safe operating VOUT = 2.5 V area is essentially package power dissipation and the internal IOUT = 150 mA preset thermal limit of the device. IGND = 1.1 µA To obtain high operating currents, careful device layout and circuit operating conditions need to be taken into account. The following discussion assumes that the LDO regulator is mounted on a printed circuit board using the minimum recommended footprint, and the printed circuit board is 0.062-inch thick FR4 material with one ounce copper. From the discussion above, PD(MAX) was determined to equal 667 mW at TA = 25 °C. Therefore, the AAT3221/3222 can sustain At any given ambient temperature (TA), the maximum package a constant 2.5 V output at a 150 mA load current as long as VIN ≤ power dissipation can be determined by the following equation: 6.95 V at an ambient temperature of 25 °C. The maximum input operating voltage is 5.5 V for the AAT3221/3222. Therefore, at 25 °C, the device would not have any thermal concerns or operational VIN(MAX) limits. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 11

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR This situation can be different at 85 °C. The following is an example for an AAT3221/3222 set for a 2.5 V output at 85 °C: VOUT = 2.5 V IOUT = 150 mA IGND = 1.1 µA Figure 24: Device Duty Cycle vs Voltage Drop From the discussion above, PD(MAX) was determined to equal 267 mW at TA = 85 °C. (VOUT = 2.5 V @ 25 °C) Higher input-to-output voltage differentials can be obtained with the AAT3221/3222, while maintaining device functions in the thermal safe operating area. To accomplish this, the device thermal resistance must be reduced by increasing the heat sink area or by operating the LDO regulator in a duty-cycled mode. For example, an application requires VIN = 5.0 V while VOUT = 2.5 V at a 150 mA load and TA = 85 °C. VIN is greater than 4.28 V, which is the maximum safe continuous input level for VOUT = 2.5 V at 150 mA for TA = 85 °C. To maintain this high input voltage and output current level, the LDO regulator must be operated in a duty-cycled mode. Refer to the following calculation Figure 25: Device Duty Cycle vs Voltage Drop for duty-cycle operation: (VOUT = 2.5 V @ 50 °C) IGND = 1.1 µA IOUT = 150 mA VIN = 5.0 V VOUT = 2.5 V Figure 26: Device Duty Cycle vs Voltage Drop PD(MAX) is assumed to be 267 mW. (VOUT = 2.5 V @ 85 °C) For a 150 mA output current and a 2.5 V drop across the AAT3221/3222 at an ambient temperature of 85 °C, the High Peak Output Current Applications maximum on-time duty cycle for the device is 71.2%. Some applications require the LDO regulator to operate at The following family of curves shows the safe operating area for continuous nominal levels with short duration, high-current duty-cycled operation from ambient room temperature to the peaks. The duty cycles for both output current levels must be maximum operating level. taken into account. To do so, one would first need to calculate the power dissipation at the nominal continuous level, then factor in the additional power dissipation due to the short duration, high- current peaks. For example, a 2.5 V system using an AAT3221/2IGV-2.5-T1 operates at a continuous 100 mA load current level and has short 150 mA current peaks. The current peak occurs for 378 µs out of a 4.61 ms period. It will be assumed the input voltage is 5.0 V. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 12 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR First, the current duty cycle percentage must be calculated: The maximum power dissipation for the AAT3221/3222 operating at an ambient temperature of 85 °C is 267 mW. The device in this % Peak duty cycle: x/100 = 378 µs/4.61 ms example has a total power dissipation of 260.25 mW. This is % Peak duty cycle = 8.2% within the thermal limits for safe operation of the device. The LDO regulator is under the 100 mA load for 91.8% of the 4.61 ms period and have 150 mA peaks occurring for 8.2% of the time. Next, the continuous nominal power dissipation for the Printed Circuit Board Layout Recommendations 100 mA load should be determined then multiplied by the duty To obtain the maximum performance from the AAT3221/3222 cycle to conclude the actual power dissipation over time. LDO regulator, very careful attention must be considered in PD(MAX) = (VIN – VOUT) IOUT + (VIN × IGND) regard to the printed circuit board layout. If grounding PD(100mA) = (5.0 V – 2.5 V) Х 100 mA + (5.0 V × 1.1 μA) connections are not properly made, power supply ripple rejection PD(100mA) = 250 mW and LDO regulator transient response can be compromised. PD(91.8%D/C) = %DC · PD(100mA) The LDO regulator external capacitors CIN and COUT should be PD(91.8%D/C) = 0.918 × 250 mW connected as directly as possible to the ground pin of the LDO PD(91.8%D/C) = 229.5 mW regulator. For maximum performance with the AAT3221/3222, the ground pin connection should then be made directly back to The power dissipation for a 100 mA load occurring for 91.8% of the ground or common of the source power supply. If a direct the duty cycle is 229.5 mW. Now, the power dissipation for the ground return path is not possible due to printed circuit board remaining 8.2% of the duty cycle at the 150 mA load can be layout limitations, the LDO ground pin should then be connected calculated: to the common ground plane in the application layout. PD(MAX) = (VIN – VOUT) IOUT + (VIN × IGND) PD(150MA) = (5.0 V – 2.5 V) × 150 mA + (5.0 V × 1.1 μA) PD(150mA) = 375 mW Evaluation Board Description PD(8.2%D/C) = %DC × PD(150mA) The AAT3221 Evaluation Board schematic diagrams are provided PD(8.2%D/C) = 0.082 × 375 mW in Figures 27 and 28. The PCB layout is illustrated in Figures 29 PD(8.2%D/C) = 30.75 mW and 30. Component values for the AAT3221 Evaluation Boards are listed in Tables 5 and 6. The power dissipation for a 150 mA load occurring for 8.2% of the duty cycle will be 30.75 mW. Finally, the two power dissipation levels can be summed to determine the total true power Package Information dissipation under the varied load: Package dimensions are shown in Figures 31 (SOT23-5) and 33 PD(total) = PD(100 mA) + PD(150 mA) (SC70JW-8), and tape and reel dimensions are provided in PD(total) = 229.5 mW + 30.75 mW Figures 32 (SOT23-5) and 34 (SC70JW-8). PD(total) = 260.25 mW Figure 27: AAT3221 (SOT23-5) Evaluation Board Schematic Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 13

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Figure 28: AAT3221 (SC70JW-8) Evaluation Board Schematic Figure 29: AAT3221 (SOT23-5) Evaluation Board Figure 30: AAT3221 (SC70JW-8) Evaluation Board Table 5. AAT3221 (SOT23-5) Evaluation Board Bill of Materials (BOM) Component Part Number Description Manufacturer U1 AAT3221IGV-XX-T1 150 mA, NanoPower low dropout linear regulator Skyworks R1 RC0603FR-07100KL Resistor, 100 kΩ, 1/10W, 1%, 0603 SMD Yageo C1, C2 GRM31MR71E105K Cap Ceramic, 1µF, 1206 X7R, 25V, 10% Murata Table 6. AAT3221 (SC70JW-8) Evaluation Board Bill of Materials (BOM) Component Part Number Description Manufacturer U1 AAT3221IJS-XX-T1 150 mA, NanoPower low dropout linear regulator Skyworks R1,R2 RC0603FR-07100KL Resistor, 100 kΩ, 1/10W, 1%, 0603 SMD Yageo C1,C2 GRM31MR71E105K Cap Ceramic, 1µF, 1206 X7R, 25V, 10% Murata Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 14 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Figure 31. AAT3221/3222 5-Pin SOT23-5 Package Dimensions Figure 32. AAT3221/3222 Tape and Reel Dimensions (SOT23-5) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 15

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Figure 33. AAT3221 8-Pin SC70JW-8 Package Dimensions Figure 34. AAT3221/3222 Tape and Reel Dimensions (SC70JW-8) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 16 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Ordering Information Output Voltage Enable Package Marking (Note 1) Part Number (Tape and Reel) (Note 2) 1.6V GYXYY AAT3221IGV-1.6-T1 1.7V GBXYY AAT3221IGV-1.7-T1 1.8V BBXYY AAT3221IGV-1.8-T1 1.9V CGXYY AAT3221IGV-1.9-T1 2.0V BLXYY AAT3221IGV-2.0-T1 2.3V FLXYY AAT3221IGV-2.3-T1 2.4V FMXYY AAT3221IGV-2.4-T1 2.5V AKXYY AAT3221IGV-2.5-T1 SOT23-5 2.6V GPXYY AAT3221IGV-2.6-T1 2.7V GDXYY AAT3221IGV-2.7-T1 2.8V AQXYY AAT3221IGV-2.8-T1 2.85V BYXYY AAT3221IGV-2.85-T1 2.9V JCXYY AAT3221IGV-2.9-T1 3.0V ALXYY AAT3221IGV-3.0-T1 3.1V GVXYY AAT3221IGV-3.1-T1 3.3V AMXYY AAT3221IGV-3.3-T1 1.5V CFXYY AAT3221IJS-1.5-T1 1.6V AAT3221IJS-1.6-T1 1.7V Active high AAT3221IJS-1.7-T1 1.8V BBXYY AAT3221IJS-1.8-T1 1.9V CGXYY AAT3221IJS-1.9-T1 2.0V BLXYY AAT3221IJS-2.0-T1 2.3V FLXYY AAT3221IJS-2.3-T1 2.4V FMXYY AAT3221IJS-2.4-T1 2.5V AKXYY AAT3221IJS-2.5-T1 2.6V SC70JW-8 GPXYY AAT3221IJS-2.6-T1 2.7V GDXYY AAT3221IJS-2.7-T1 2.8V AQXYY AAT3221IJS-2.8-T1 2.85V BYXYY AAT3221IJS-2.85-T1 2.9V JCXYY AAT3221IJS-2.9-T1 3.0V ALXYY AAT3221IJS-3.0-T1 3.1V GVXYY AAT3221IJS-3.1-T1 3.2V LEXYY AAT3221IJS-3.2-T1 3.3V AMXYY AAT3221IJS-3.3-T1 3.5V BMXYY AAT3221IJS-3.5-T1 2.8V BIXYY AAT3222IGV-2.8-T1 2.9V SOT23-5 AAT3222IGV-2.9-T1 2.8V Active low CXXYY AAT3221IGV-2.8-2 T1 Note 1: XYY = assembly and date code. Note 2: Sample stock is generally held on part numbers listed in BOLD. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 202251B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 17, 2013 17

DATA SHEET • AAT3221/AAT3222 150 mA NANOPOWERTM LDO LINEAR REGULATOR Copyright © 2013 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 18 May 17, 2013 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202251B