MIC59150 Ultra High Speed 1.5A LDO General Description Features The MIC59150 is a high-bandwidth, low-dropout, 1.5A • Input voltage range: linear voltage regulator ideal for powering core voltages of – V = 1.0V to 3.8V IN low-power microprocessors. The MIC59150 implements a – V = 3.0V to 5.5V dual supply configuration allowing for a very low output BIAS • Stable with 1µF ceramic capacitor impedance and a very fast transient response. • Maximum dropout voltage of 250mV over temperature The MIC59150 requires a bias input supply and a main input supply, allowing for ultra-low input voltages on the • Adjustable output voltage down to 0.5V main supply rail. The device operates from an input supply • Ultra fast transient response of 1.0V to 3.8V and bias supply between 3V and 5.5V. The • Excellent line and load regulation specifications MIC59150 offers adjustable output voltages down to 0.5V. • Logic controlled shutdown option The MIC59150 requires a minimum output capacitance for • Thermal shutdown and current limit protection stability, working optimally with small ceramic capacitors. • Junction temperature range: –40°C to +125°C The MIC59150 is available in an 8-pin EPAD SOIC • 8-pin EPAD SOIC package and its junction temperature range is –40°C to +125°C. Data sheets and support documentation can be found on Applications Micrel’s web site at: www.micrel.com. • Telecommunications processors • Graphics processors • Computer peripheral cards • Logic IC power supply • SMPS post regulators • Microprocessors • Digital TV’s _________________________________________________________________________________________________________ Typical Application MIC59150YME VIN VIN VOUT VOUT CIN=1µF (Ceramic) R1 VBIAS VBIAS COUT=1µF ADJ (Ceramic) EN EN CBIAS=1µF GND R2 (Ceramic) Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com December 2008 M9999-121808-A

Micrel, Inc. MIC59150 Ordering Information Part Number Voltage(1) Junction Temperature Range Package Lead Finish MIC59150YME Adj. –40°C to +125°C 8-Pin EPAD SOIC RoHS Compliant Note: 1. Other Voltage available. Contact Micrel for detail. Pin Configuration EN 1 8 GND VBIAS 2 7 ADJ VIN 3 6 VIN VOUT 4 5 VOUT 8-Pin EPAD SOIC (ME) Pin Description Pin Number Pin Name Pin Function 1 EN Enable (Input): CMOS compatible input. Logic high = enable, logic low = shutdown. 2 VBIAS Input bias voltage for powering all circuitry on the regulator with the exception of the output power device. 3, 6 VIN Input voltage needed for the output power device. 4, 5 VOUT Regulator Output. 7 ADJ Adjustable regulator feedback input. Connect to resistor voltage divider. 8 GND Ground. December 2008 2 M9999-121808-A

Micrel, Inc. MIC59150 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (V )........................................–0.3V to +4V Supply Voltage (V )............................................1V to 3.8V IN IN Bias Supply Voltage (V ).............................–0.3V to +6V Bias Supply Voltage (V ).................................3V to 5.5V BIAS BIAS Enable Input Voltage (V ).............................–0.3V to V Enable Input Voltage (V )..................................0V to V EN BIAS EN BIAS Power Dissipation.....................................Internally Limited Junction Temperature (T )..................–40°C ≤ T ≤ +125°C J J Storage Temperature (T ).........................–65°C to +150°C Package Thermal Resistance s ESD Rating(3)................................................................+3kV EPAD SOIC (θ )...............................................41°C/W JA Electrical Characteristics(4) T = 25°C with V = V + 2.2V; V = V + 1V; bold values indicate 0°C ≤ T ≤ 85°C, unless otherwise specified. A BIAS OUT IN OUT J Parameter Condition Min Typ Max Units Line Regulation (V ) V = V + 1V to 3.8V, I = 10mA 0.002 ±0.1 %/V IN IN OUT LOAD Line Regulation (V ) V = 3V to 5.5V (V < 0.8V), I = 10mA 0.026 ±0.3 %/V BIAS BIAS OUT LOAD V = V + 2.2V to 5.5V (V ≥ 0.8V), I = 10mA BIAS OUT OUT LOAD Feedback Voltage Room temperature 0.495 0.5 0.505 V (Adjustable Output Voltage) Over temperature range 0.490 0.5 0.510 V Output Voltage Load Regulation I = 10mA to 1.5A 0.1 0.5 % L V – V ; Dropout Voltage I = 750mA 65 150 mV IN OUT L I = 1.5A 100 250 mV L V – V ; Dropout Voltage I = 1.5A 0.85 2.1 V BIAS OUT L V supply current V = 2V, I = 100mA 1.3 7.5 mA BIAS EN L V = 2V, I = 1.5A 12.5 75 mA EN L V shutdown current V = 0V 0.02 1 µA BIAS EN V shutdown current V = 0V 0.04 1 µA IN EN FB bias current 0.03 1 µA UVLO V rising 2.7 2.84 3.0 V BIAS Hysteresis 100 mV Current Limit V = 0V 1.8 3.1 6.0 A OUT Enable Input Enable Input Threshold Regulator enable 1.6 0.85 V Regulator shutdown 0.75 0.3 V Enable Pin Input Current Independent of state 0.012 1 µA AC Response Large signal bandwidth 1 MHz PSRR (BIAS) at 10kHz V = 3.3V, I = 750mA 46 dB BIAS OUT PSRR (IN) at 10kHz V = V + 1V, I = 750mA 60 dB IN OUT OUT V = V + 0.3V, I = 750mA 55 dB IN OUT OUT Thermal Shutdown 145 °C Thermal Shutdown Hysteresis 12 °C Turn-on Time 85 300 µs Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 4. Specification for packaged product only. December 2008 3 M9999-121808-A

Micrel, Inc. MIC59150 Typical Characteristics Power Supply Power Supply Dropout Voltage Rejection Ratio (V ) Rejection Ratio (V ) (V ) 80 IN 90 BIAS 160 IN 70 80 V)140 m 60 70 E (120 PSRR (dB)345000 VBIAS = 3.3V PSRR (dB)34560000 VBIAS = 3.3V OUT VOLTAG1068000 20 VIN = 1.8V 20 VIN = 1.8V OP 40 V = 1V V = 1V R V = 3.3V 10 OUT 10 OUT D 20 BIAS I = 0.75A I = 0.75A V = 1V OUT OUT OUT 0 0 0 0.01 0.1 1 10 100 1000 0.01 0.1 1 10 100 1000 0.75 1 1.25 1.5 FREQUENCY (kHz) FREQUENCY (kHz) OUTPUT CURRENT (A) Dropout Voltage Dropout Voltage vs. Dropout Voltage vs. (V ) Temperature (V ) Temperature (V ) 1.2 BIAS 160 IN 1.2 BIAS V) 1 mV)140 V) 1 DROPOUT VOLTAGE (0000....2468 VVIN = =3 V2.5V DROPOUT VOLTAGE (11022468000000 VVIBOIUAT S= == 1 35.5..45A5VV DROPOUT VOLTAGE (0000....2468 VVIIONU =T = =3 1 .38.5.V4A5V OUT OUT OUT 0 0 0 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 2 2 4 6 8 0 2 4 2 2 4 6 8 0 2 OUTPUT CURRENT (A) - - 1 1 - - 1 1 TEMPERATURE (°C) TEMPERATURE (°C) Dropout Characteristics Load Regulation Bias Current (V ) vs. Temperature 3 BIAS 1.005 30 V = 3V 10mA 1.004 BIAS AGE (V)2.52 1.5A AGE (V)11..000023 T (mA)2205 IOUT=0.75A VVIONU =T =1 .05.V5V T T1.001 N L L E VO1.5 VO 1 RR15 IOUT=1.5A PUT 1 PUT 00..999989 S CU10 OUT0.5 VVIONU =T =3 V2.5V OUT00..999967 VVVBIONIUA =TS =1= . 153VV.3V BIA 5 IOUT=100mA 0 0.995 0 0 1 2 3 4 5 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0 0 0 0 0 0 0 0 0 4 2 2 4 6 8 0 2 BIAS VOLTAGE (V) OUTPUT CURRENT (A) - - 1 1 TEMPERATURE (°C) Bias Current Ground Current Feedback Voltage vs. Output Current vs. Bias Voltage vs. Input Voltage 20 0.6 0.502 mA)16 T (mA)0.5 GE (V)0.501 T ( EN0.4 TA N12 R L E R O R U0.3 V 0.5 BIAS CUR 48 VVBINIA =S =1 .35V.3V GROUND C00..12 VIN = 1.8V FEEDBACK 0.499 VBIAS = 3.3V V = 1V V = 1V V = 1V OUT OUT OUT 0 0 0.498 0 0.2 0.4 0.6 0.8 1 1.2 1.4 3 3.5 4 4.5 5 5.5 1.5 1.9 2.3 2.7 3.1 3.5 3.9 OUTPUT CURRENT (A) BIAS VOLTAGE (V) INPUT VOLTAGE (V) December 2008 4 M9999-121808-A

Micrel, Inc. MIC59150 Typical Characteristics (continued) Feedback Voltage FeedbackVoltage Enable Threshold vs. Bias Voltage vs. Temperature vs. Bias Voltage 0.505 0.51 1.2 E (V)00..550034 E (V)00..550068 D (V) 1 AG0.502 AG0.504 OL0.8 LT0.501 LT0.502 SH O O E V 0.5 V 0.5 R0.6 K K H C0.499 C0.498 T BA0.498 BA0.496 LE 0.4 D D B FEE00..449967 VVIN = =1 .18VV FEE00..449924 VVBIA =S =1. 53V.3V ENA0.2 VVIN = =1 .18VV OUT IN OUT 0.495 0.49 0 3 3.5 4 4.5 5 5.5 0 0 0 0 0 0 0 0 0 3 3.5 4 4.5 5 5.5 4 2 2 4 6 8 0 2 BIAS VOLTAGE (V) - -TEMPERATURE (°C)1 1 BIAS VOLTAGE (V) December 2008 5 M9999-121808-A

Micrel, Inc. MIC59150 Functional Characteristics December 2008 6 M9999-121808-A

Micrel, Inc. MIC59150 Functional Diagram V BIAS V IN EN Enable Bandgap ADJ Ilimit V OUT MIC59150 Block Diagram December 2008 7 M9999-121808-A

Micrel, Inc. MIC59150 Application Information type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60% The MIC59150 is an ultra-high performance, low-dropout respectively over their operating temperature ranges. To linear regulator designed for high current applications use a ceramic chip capacitor with Y5V dielectric, the requiring a fast transient response. The MIC59150 value must be much higher than an X7R ceramic or a utilizes two input supplies, significantly reducing dropout tantalum capacitor to ensure the same capacitance voltage, making it perfect for low-voltage, DC-to-DC value over the operating temperature range. Tantalum conversion. The MIC59150 requires a minimum number capacitors have a very stable dielectric (10% over their of external components, and as a μCap regulator, the operating temperature range) and can also be used with output is tolerant of virtually any type of capacitor, this device. including ceramic type and tantalum type capacitors. The MIC59150 regulator is fully protected from damage Input Capacitor due to fault conditions, offering linear current limiting and An input capacitor of 1μF or greater is recommended thermal shutdown. when the device is more than 4 inches away from the bulk supply capacitance, or when the supply is a battery. Bias Supply Voltage Small, surface-mount, ceramic chip capacitors can be VBIAS, requiring relatively light current, provides power to used for the bypassing. The capacitor should be placed the control portion of the MIC59150. VBIAS requires within 1" of the device for optimal performance. Larger approximately 12mA for a 1.5A load current. Dropout values will help to improve ripple rejection by bypassing conditions require higher currents. Most of the biasing the input to the regulator, further improving the integrity current is used to supply the base current to the pass of the output voltage. transistor. This allows the pass element to be driven into saturation, reducing the dropout to 100mV at a 1.5A load Thermal Design current. Bypassing on the bias pin is recommended to Linear regulators are simple to use. The most improve performance of the regulator during line and complicated design parameters to consider are thermal load transients. Small ceramic capacitors from VBIAS to characteristics. Thermal design requires the following ground help reduce high frequency noise from being application-specific parameters: injected into the control circuitry from the bias rail and • Maximum ambient temperature (T ) A are good design practice. Good bypass techniques • Output current (I ) typically include one larger capacitor such as 1μF OUT ceramic and smaller valued capacitors such as 0.01μF • Output voltage (V ) OUT or 0.001μF in parallel with that larger capacitor to • Input voltage (V ) IN decouple the bias supply. The VBIAS input voltage must • Ground current (I ) be 2.1V above the output voltage with a minimum VBIAS GND input voltage of 3V. First, calculate the power dissipation (P ) of the D regulator from these numbers and the device Input Supply Voltage parameters from this datasheet. VIN provides the high current to the collector of the pass PD =VIN ×IIN +VBIAS ×IBIAS −VOUT ×IOUT transistor. The minimum input voltage is 1.0V, allowing The input current will be less than the output current at conversion from low voltage supplies. high output currents as the load increases. The bias Output Capacitor current is a sum of base drive and ground current. Ground current is constant over load current. Then the The MIC59150 requires a minimum of output heat sink thermal resistance is determined with this capacitance to maintain stability. However, proper formula: capacitor selection is important to ensure desired transient response. The MIC59150 is specifically ⎛T −T ⎞ designed to be stable with virtually any capacitance θSA =⎜⎜ J(MAPX) A ⎟⎟−(θJC +θCS) value and ESR. A 1μF ceramic chip capacitor should ⎝ D ⎠ satisfy most applications. Output capacitance can be The heat sink may be significantly reduced in increased without bound. See the “Functional applications where the maximum input voltage is known Characteristics” subsection for examples of load and large compared with the dropout voltage. Use a transient response. series input resistor to drop excessive voltage and X7R dielectric ceramic capacitors are recommended distribute the heat between this resistor and the because of their temperature performance. X7R-type regulator. The low-dropout properties of the MIC59150 capacitors change capacitance by 15% over their allow significant reductions in regulator power dissipation operating temperature range and are the most stable and the associated heat sink without compromising December 2008 8 M9999-121808-A

Micrel, Inc. MIC59150 performance. When this technique is employed, a values can cause instability. The resistor values are capacitor of at least 1μF is needed directly between the calculated by: input and regulator ground. Refer to “Application Note 9” ⎛V ⎞ (http://www.micrel.com/_PDF/App-Notes/an-9.pdf) for R =R ×⎜ OUT −1⎟ further details and examples on thermal design and heat 1 2 ⎜⎝ 0.5 ⎟⎠ sink specification. where VOUT is the desired output voltage. Minimum Load Current Enable The MIC59150, unlike most other high current An active high enable input (EN) allows on-off control of regulators, does not require a minimum load to maintain the regulator. Current drain reduces to “zero” when the output voltage regulation. device is shutdown, with only microamperes of leakage Adjustable Regulator Design current. The EN input has CMOS compatible thresholds for simple logic interfacing. EN may be directly tied to The MIC59150 adjustable version allows programming the output voltage anywhere between 0.5Vand 3.5V. VBIAS and pulled up to the maximum supply voltage. Two resistors are used. The resistor value between VOUT and the adjust pin should not exceed 10kΩ. Larger December 2008 9 M9999-121808-A

Micrel, Inc. MIC59150 U1 MIC59150YME J1 VIN 3 VIN VOUT 4 J4 1V to 3.8V C1 6 VIN VOUT 5 VOUT 1uF/6.3V C4 R1 C3 J2 OPEN 1K 1uF/6.3V GND C2 J5 J3 1uF/6.3V VBIAS 2 VBIAS ADJ 7 GND 3V to 5.5V 1 2 1 JP1 EN GND JP2 = Voltages Selector 3 8 R2 R3 R4 R5 A VOUT = 1.0V 1K 698 499 383 B VOUT = 1.2V C VOUT = 1.5V A B C D D VOUT = 1.8V 2 4 6 8 JP2 1 3 5 7 Bill of Materials Item Part Number Manufacturer Description Qty. C1,C2 C1608X5R0J105K TDK(1) 1uF Ceramic Capacitor X5R 0603 6.3V 3 C3 GRM188R60J105KA01D Murata(2) 0603D105KAT2A AVX(3) C4 Open 1 R1,R2 CRCW06031K00FKXX Vishay(4) 1kΩ 1% 0603 Resistor 2 R3 CRCW0603698RFKXX Vishay(4) 698Ω 1% 0603 Resistor 1 R4 CRCW0603499RFKXX Vishay(4) 499Ω 1% 0603 Resistor 1 R5 CRCW0603383RFKXX Vishay(4) 383Ω 1% 0603 Resistor 1 U1 MIC59150YME Micrel, Inc.(5) Ultra High Speed 1.5A LDO 1 Notes: 1. TDK: www.tdk.com 2. Murata Tel: www.murata.com 3. AVX Tel: www.avx.com 4. Vishay Tel: www.vishay.com 5. Micrel, Inc.: www.micrel.com December 2008 10 M9999-121808-A

Micrel, Inc. MIC59150 PCB Layout Recommendations Top Layer Bottom Layer December 2008 11 M9999-121808-A

Micrel, Inc. MIC59150 Package Information 8-Pin EPAD SOIC (ME) MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2008 Micrel, Incorporated. December 2008 12 M9999-121808-A

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