MIC2025/2075 Micrel, Inc. MIC2025/2075 Single-Channel Power Distribution Switch MM8® General Description Features The MIC2025 and MIC2075 are high-side MOSFET switches • 140mΩ maximum on-resistance optimized for general-purpose power distribution requiring • 2.7V to 5.5V operating range circuit protection. • 500mA minimum continuous output current • Short-circuit protection with thermal shutdown The MIC2025/75 are internally current limited and have • Fault status flag with 3ms filter eliminates false asser- thermal shutdown that protects the device and load. The tions MIC2075 offers “smart” thermal shutdown that reduces cur- • Undervoltage lockout rent consumption in fault modes. When a thermal shutdown • Reverse current flow blocking (no “body diode”) fault occurs, the output is latched off until the faulty load is • Circuit breaker mode (MIC2075) reduces power removed. Removing the load or toggling the enable input will consumption reset the device output. • Logic-compatible input Both devices employ soft-start circuitry that minimizes inrush • Soft-start circuit current in applications where highly capacitive loads are em- • Low quiescent current ployed. A fault status output flag is provided that is asserted • Pin-compatible with MIC2525 during overcurrent and thermal shutdown conditions. • UL File # E179633 The MIC2025/75 is available in the MM8® 8-lead MSOP and 8-lead SOP. Applications • USB peripherals • General purpose power switching • ACPI power distribution • Notebook PCs • PDAs • PC card hot swap Typical Application V CC 2.7V to 5.5V 10k Logic Controller MIC2025/75 VIN ON/OFF EN OUT Load OVERCURRENT FLG IN 1µF GND GND OUT NC NC 0.1µF UL Recognized Component MM8 is a registered trademark of Micrel, Inc. Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com June 2010 1 MIC2025/2075

MIC2025/2075 Micrel, Inc. Ordering Information Part Number Enable Temperature Range Package Standard Pb-Free MIC2025-1BM MIC2025-1YM Active High -40°C to +85°C 8-Lead SOIC MIC2025-2BM MIC2025-2YM Active Low -40°C to +85°C 8-Lead SOIC MIC2025-1BMM MIC2025-1YMM Active High -40°C to +85°C 8-Pin MSOP MIC2025-2BMM MIC2025-2YMM Active Low -40°C to +85°C 8-Pin MSOP MIC2075-1BM MIC2075-1YM Active High -40°C to +85°C 8-Lead SOIC MIC2075-2BM MIC2075-2YM Active Low -40°C to +85°C 8-Lead SOIC MIC2075-1BMM MIC2075-1YMM Active High -40°C to +85°C 8-Pin MSOP MIC2075-2BMM MIC2075-2YMM Active Low -40°C to +85°C 8-Pin MSOP Pin Configuration MIC2025/75 EN 1 8 OUT FLG 2 7 IN GND 3 6 OUT NC 4 5 NC 8-Lead SOIC (BM) 8-Lead MSOP (BMM) Pin Description Pin Number Pin Name Pin Function 1 EN Switch Enable (Input): Active-high (-1) or active-low (-2). 2 FLG Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent or thermal shutdown conditions. Overcurrent condition must exceed t in order D to assert FLG. 3 GND Ground 4 NC not internally connected 5 NC not internally connected 6, 8 OUT Supply (Output): Pins must be connected together. 7 IN Supply Voltage (Input). MIC2025/2075 2 June 2010

MIC2025/2075 Micrel, Inc. Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Voltage (V ) ..........................................–0.3V to 6V Supply Voltage (V ) ...................................+2.7V to +5.5V IN IN Fault Flag Voltage (V ) ..............................................+6V Ambient Temperature (T ) ..........................–40°C to +85°C FLG A Fault Flag Current (I ).............................................25mA Junction Temperature (T ) ........................Internally Limited FLG J Output Voltage (V ) ...................................................+6V Thermal Resistance OUT Output Current (IOUT) ...............................Internally Limited SOP (θJA) ..........................................................160°C/W MSOP(θ ) ........................................................206°C/W Enable Input (I ) .....................................–0.3V to V +3V JA EN IN Storage Temperature (T ) ........................–65°C to +150°C S ESD Rating, Note 3 Electrical Characteristics V = +5V; T = 25°C, bold values indicate –40°C ≤ T ≤ +85°C; unless noted IN A A Symbol Parameter Condition Min Typ Max Units I Supply Current MIC20x5-1, V ≤ 0.8V,(switch off), 0.75 5 µA DD EN OUT = open MIC20x5-2, V ≥ 2.4V,(switch off), 0.75 5 µA EN OUT = open MIC20x5-1, V ≥ 2.4V,(switch on), 160 µA EN OUT = open MIC20x5-2, V ≤ 0.8V,(switch on), 160 µA EN OUT = open V Enable Input Voltage low-to-high transition 2.1 2.4 V EN high-to-low transition 0.8 1.9 V Enable Input Hysteresis 200 mV I Enable Input Current V = 0V to 5.5V –1 0.01 1 µA EN EN Control Input Capacitance 1 pF R Switch Resistance V = 5V, I = 500mA 90 140 mΩ DS(on) IN OUT V = 3.3V, I = 500mA 100 160 mΩ IN OUT Output Leakage Current MIC2025/2075 (output off) 10 µA OFF Current in Latched MIC2075 50 µA Thermal Shutdown (during thermal shutdown state) t Output Turn-On Delay R = 10Ω, C = 1µF, see “Timing Diagrams” 1 2.5 6 ms ON L L t Output Turn-On Rise Time R = 10Ω, C = 1µF, see “Timing Diagrams” 0.5 2.3 5.9 ms R L L t Output Turnoff Delay R = 10Ω, C = 1µF, see “Timing Diagrams” 50 100 µs OFF L L t Output Turnoff Fall Time R = 10Ω, C = 1µF, see “Timing Diagrams” 50 100 µs F L L I Short-Circuit Output Current V = 0V, enabled into short-circuit. 0.5 0.7 1.25 A LIMIT OUT Current-Limit Threshold ramped load applied to output, Note 4 0.60 0.85 1.25 A Short-Circuit Response Time V = 0V to I = I 24 µs OUT OUT LIMIT (Short applied to output) t Overcurrent Flag Response V = 5V, apply V = 0V until FLG low 1.5 3 7 ms D IN OUT Delay V = 3.3V, apply V = 0V until FLG low 1.5 3 8 ms IN OUT Undervoltage Lockout V rising 2.2 2.5 2.7 V IN Threshold V falling 2.0 2.3 2.5 V IN June 2010 3 MIC2025/2075

MIC2025/2075 Micrel, Inc. Symbol Parameter Condition Min Typ Max Units Error Flag Output I = 10mA, V = 5V 8 25 Ω L IN Resistance I = 10mA, V = 3.3V 11 40 Ω L IN Error Flag Off Current V = 5V 10 µA FLAG Overtemperature Threshold T increasing 140 °C J T decreasing 120 °C J Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. Devices are ESD sensitive. Handling precautions recommended. Note 4. See “Functional Characteristics: Current-Limit Response” graph. Test Circuit V OUT Device IOUT Under OUT Test R C L L Timing Diagrams tR tF 90% 90% VOUT 10% 10% Output Rise and Fall Times 50% VEN tOFF tON V 90% OUT 10% Active-Low Switch Delay Times (MIC20x5-2) VEN 50% tOFF tON 90% VOUT 10% Active-High Switch Delay Times (MIC20x5-1) MIC2025/2075 4 June 2010

MIC2025/2075 Micrel, Inc. Supply On-Current On-Resistance Turn-OnRiseTime vs. Temperature vs. Temperature vs. Temperature 180 160 5 160 140 µCURRENT(A)11102424680000000 35.3VV ΩON-RESISTANCE (m)11022468000000 IOUT3=.35V00m5VA RISE TIME (ms)1234 VIN=3.3VVIN=R5CVL==110µΩF L 0 0 0 -40 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 TEMPERATURE(°C) TEMPERATURE(°C) TEMPERATURE(°C) Supply On-Current On-Resistance Turn-OnRiseTime vs. InputVoltage vs. InputVoltage vs. InputVoltage 200 200 5.0 4.0 +85°C 150 150 µCURRENT(A)10500 +85°C -40+°2C5°C ΩRESISTANCE (m)10500 ++-482055°°°CCC RISE TIME (ms)123...000 -40°C +R25=°1C0Ω L IOUT=500mA CL=1µF 0 0 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) Short-CircuitCurrent-Limit Current-LimitThreshold EnableThreshold vs. Temperature vs. Temperature vs. Temperature 1000 1200 2.5 800 VIN=3.3V mA)1000 VIN=3.3V 2.0 RENT LIMIT (mA) 460000 VIN=5V MIT THRESHOLD ( 468000000 VIN=5V E THRESHOLD (V)11..05 VENFAVLELNINRGISING CUR 200 RENT LI 200 ENABL0.5 VIN=5V R 0 U 0 0 -40 -20 0 20 40 60 80 100 C -40 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 TEMPERATURE(°C) TEMPERATURE(°C) TEMPERATURE(°C) Short-CircuitCurrent-Limit Current-LimitThreshold EnableThreshold vs. InputVoltage vs. InputVoltage vs. InputVoltage 800 1200 2.5 700 +25°C mA)11010000 2.0 RENT LIMIT (mA)345600000000 +85°C -40°C MIT THRESHOLD ( 456789000000000000 +85°C +25°C -40°C E THRESHOLD (V)11..05 VVEENNFRAISLLININGG CUR120000 RENT LI 123000000 ENABL0.5 TA=25°C R 0 U 0 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 C 2.5 3.0 3.5 4.0 4.5 5.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) June 2010 5 MIC2025/2075

MIC2025/2075 Micrel, Inc. Flag Delay Flag Delay UVLO Threshold vs. Temperature vs. InputVoltage vs. Temperature 5 5 3.0 V RISING VIN=3.3V +85°C 2.5 IN 4 4 ME (ms)3 VIN=5V ME (ms)3 +25°C HOLD (V)12..50 VINFALLING DELAY TI12 DELAY TI12 -40°C UVLO THRES01..50 0 0 0 -40 -20 0 20 40 60 80 100 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -40 -20 0 20 40 60 80 100 TEMPERATURE(°C) INPUT VOLTAGE (V) TEMPERATURE(°C) MIC2025/2075 6 June 2010

MIC2025/2075 Micrel, Inc. Functional Characteristics June 2010 7 MIC2025/2075

MIC2025/2075 Micrel, Inc. MIC2025/2075 8 June 2010

MIC2025/2075 Micrel, Inc. Block Diagram EN THERMAL 1.2V OSC. UVLO IN SHUTDOWN REFERENCE CHARGE CURRENT PUMP LIMIT GATE CONTROL FLAG OUT RESPONSE DELAY FLG GND Functional Description Power Dissipation Input and Output The device’s junction temperature depends on several fac- tors such as the load, PCB layout, ambient temperature IN is the power supply connection to the logic circuitry and and package type. Equations that can be used to calculate the drain of the output MOSFET. OUT is the source of the power dissipation of each channel and junction temperature output MOSFET. In a typical circuit, current flows from IN to are found below. OUT toward the load. If V is greater than V , current will OUT IN flow from OUT to IN since the switch is bidirectional when P D = RDS(on) × IOUT2 enabled. The output MOSFET and driver circuitry are also Total power dissipation of the device will be the summation of designed to allow the MOSFET source to be externally forced P for both channels. To relate this to junction temperature, D to a higher voltage than the drain (V > V ) when the the following equation can be used: OUT IN switch is disabled. In this situation, the MIC2025/75 avoids T = P × θ + T J D JA A undesirable current flow from OUT to IN. where: Thermal Shutdown T = junction temperature J Thermal shutdown is employed to protect the device from T = ambient temperature damage should the die temperature exceed safe margins A due mainly to short circuit faults. Each channel employs its θJA = is the thermal resistance of the package own thermal sensor. Thermal shutdown shuts off the output Current Sensing and Limiting MOSFET and asserts the FLG output if the die temperature The current-limit threshold is preset internally. The preset reaches 140°C. The MIC2025 will automatically reset its output level prevents damage to the device and external load but should the die temperature cool down to 120°C. The MIC2025 still allows a minimum current of 500mA to be delivered to output and FLG signal will continue to cycle on and off until the load. the device is disabled or the fault is removed. Figure 2 depicts The current-limit circuit senses a portion of the output MOSFET typical timing. If the MIC2075 goes into thermal shutdown, its switch current. The current-sense resistor shown in the block output will latch off and a pull-up current source is activated. diagram is virtual and has no voltage drop. The reaction to This allows the output latch to automatically reset when the an overcurrent condition varies with three scenarios: load (such as a USB device) is removed. The output can also be reset by toggling EN. Refer to Figure 1 for details. Switch Enabled into Short-Circuit Depending on PCB layout, package, ambient temperature, If a switch is enabled into a heavy load or short-circuit, the etc., it may take several hundred milliseconds from the in- switch immediately enters into a constant-current mode, cidence of the fault to the output MOSFET being shut off. reducing the output voltage. The FLG signal is asserted The worst-case scenario of thermal shutdown is that of a indicating an overcurrent condition. See the Short-Circuit short-circuit fault and is shown in the in the “Function Char- Response graph under Functional Characteristics. acteristics: Thermal Shutdown Response” graph. June 2010 9 MIC2025/2075

MIC2025/2075 Micrel, Inc. Short-Circuit Applied to Enabled Output Fault Flag When a heavy load or short-circuit is applied, a large transient The FLG signal is an N-channel open-drain MOSFET output. current may flow until the current-limit circuitry responds. Once FLG is asserted (active-low) when either an overcurrent this occurs the device limits current to less than the short-cir- or thermal shutdown condition occurs. In the case where cuit current limit specification. See the Short-Circuit Transient an overcurrent condition occurs, FLG will be asserted only Response graph under Functional Characteristics. after the flag response delay time, t , has elapsed. This D ensures that FLG is asserted only upon valid overcurrent Current-Limit Response—Ramped Load conditions and that erroneous error reporting is eliminated. The MIC2025/75 current-limit profile exhibits a small foldback For example, false overcurrent conditions can occur during effect of about 200mA. Once this current-limit threshold is hot-plug events when a highly capacitive load is connected exceeded the device switches into a constant current mode. and causes a high transient inrush current that exceeds the It is important to note that the device will supply current until current-limit threshold. The FLG response delay time t is the current-limit threshold is exceeded. See the Current-Limit D typically 3ms. Response graph under Functional Characteristics. Undervoltage Lockout Undervoltage lockout (UVLO) prevents the output MOS- FET from turning on until V exceeds approximately 2.5V. IN Undervoltage detection functions only when the switch is enabled. Load Removed (Output Reset) Short-Circuit Fautl VEN VOUT ILIMIT IDC Thermal Shutdown IOUT Reached VFLG tD Figure 1. MIC2075-2 Timing: Output Reset by Removing Load Short-Circuit Fautl VEN Load/Fault VOUT Removed ILIMIT IDC Thermal Shutdown IOUT Reached VFLG tD Figure 2. MIC2025-2 Timing MIC2025/2075 10 June 2010

MIC2025/2075 Micrel, Inc. Applications Information Universal Serial Bus (USB) Power Distribution Supply Filtering The MIC2025/75 is ideally suited for USB (Universal Serial Bus) power distribution applications. The USB specification A 0.1µF to 1µF bypass capacitor positioned close to V and IN defines power distribution for USB host systems such as GND of the device is strongly recommended to control sup- PCs and USB hubs. Hubs can either be self-powered or ply transients. Without a bypass capacitor, an output short bus-powered (that is, powered from the bus). Figure 5 below may cause sufficient ringing on the input (from supply lead shows a typical USB Host application that may be suited for inductance) to damage internal control circuitry. mobile PC applications employing USB. The requirements Printed Circuit Board Hot-Plug for USB host systems is that the port must supply a minimum The MIC2025/75 are ideal inrush current-limiters suitable for of 500mA at an output voltage of 5V ±5%. In addition, the hot-plug applications. Due to the integrated charge pump, output power delivered must be limited to below 25VA. Upon the MIC2025/75 presents a high impedance when off and an overcurrent condition, the host must also be notified. To slowly becomes a low impedance as it turns on. This “soft- support hot-plug events, the hub must have a minimum of start” feature effectively isolates power supplies from highly 120µF of bulk capacitance, preferably low-ESR electrolytic capacitive loads by reducing inrush current during hot-plug or tantulum. Refer to Application Note 17 for more details on events. Figure 3 shows how the MIC2075 may be used in a designing compliant USB hub and host systems. hot-plug application. For bus-powered hubs, USB requires that each downstream In cases of extremely large capacitive loads (>400µF), the port be switched on or off under control by the host. Up to four length of the transient due to inrush current may exceed the downstream ports each capable of supplying 100mA at 4.4V delay provided by the integrated filter. Since this inrush cur- minimum are allowed. In addition, to reduce voltage droop on rent exceeds the current-limit delay specification, FLG will the upstream V , soft-start is necessary. Although the hub BUS be asserted during this time. To prevent the logic controller can consume up to 500mA from the upstream bus the hub from responding to FLG being asserted, an external RC filter, must consume only 100mA max at start-up, until it enumer- as shown in Figure 4, can be used to filter out transient FLG ates with the host prior to requesting more power. The same assertion. The value of the RC time constant will be selected requirements apply for bus-powered peripherals that have no to match the length of the transient. downstream ports. Figure 6 shows a bus-powered hub. MIC2025-2 VCC 1 EN OUT 8 0.1 2 FLG IN 7 Backend µF to "Hot" 3 GND OUT 6 Function Receptacle 4 NC NC 5 CBULK GND Adaptor Card Figure 3. Hot Plug Application V+ Logic Controller 10k MIC2025 1 EN OUT 8 R OVERCURRENT 2 FLG IN 7 C 3 GND OUT 6 4 NC NC 5 Figure 4. Transient Filter June 2010 11 MIC2025/2075

MIC2025/2075 Micrel, Inc. V CC 5.0V 4.50V to 5.25V 3.3V 10k Ferrite Upstream V BUS Beads 100mA max. MIC5203-3.3 3.3V USB Controller MIC2025/75 VBUS IN OUT VIN ON/OFF EN OUT VBUS D+ D+ D– 1µF GND 1µF OVERGCNUDRRENT FGLNGD OUINT 120µF 0.01µF D– UPoSrBt GND GND NC NC 0.1µF Data Data Figure 5 USB Host Application USB Upstream 3.3V 1.5k Ferrite Connector MIC5203-3.3 Beads (LDO) USB Logic Controller MIC2025/75 VBUS IN OUT VIN ON/OFF EN OUT VBUS D+ D+ USB Downstream OVERCURRENT FLG IN Connector D– GND GND GND OUT 120µF 0.01µF D– (Up to four GND 0.1µF 0.1µF GND ganaged ports) NC NC 1.5K 0.1µF Data Data Figure 6. USB Bus-Powered Hub MIC2025/2075 12 June 2010

MIC2025/2075 Micrel, Inc. Package Information 8-Lead SOIC (M) MM8™ 8-Pin MSOP (MM) June 2010 13 MIC2025/2075

MIC2025/2075 Micrel, Inc. 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 This 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. © 2004 Micrel Incorporated MIC2025/2075 14 June 2010

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M icrel: MIC2025-2YM TR MIC2075-1YM TR M icrochip: MIC2075-2YMM MIC2075-1YMM MIC2025-2YM MIC2075-1YM MIC2025-1YM MIC2025-1YMM MIC2025-2YMM MIC2075-2YM MIC2025-1YMM-TR MIC2075-1YMM-TR MIC2075-1YM-TR MIC2075-2YMM-TR MIC2025-2YM-TR MIC2025-2YMM-TR MIC2025-1YM-TR