MIC5021YM

MIC5021 High-Speed, High-Side MOSFET Driver with Charge Pump and Overcurrent Limit Features General Description 12V to 36V Operation The MIC5021 high-side MOSFET driver is designed to operate at frequencies up to 100 kHz (5 kHz PWM for 550 ns Rise/Fall Time Driving 2000 pF 2% to 100% duty cycle) and is an ideal choice for high TTL-Compatible Input with Internal Pull-Down speed applications such as motor control, SMPS Resistor (switch mode power supplies), and applications using Overcurrent Limit IGBTs. The MIC5021 can also operate as a circuit Gate-to-Source Protection breaker with or without automatic retry. Internal Charge Pump A rising or falling edge on the input results in a current 100 kHz Operation Guaranteed Over Full Tem- source pulse or sink pulse on the gate output. This out- perature and Operating Voltage Range put current pulse can turn on a 2000 pF MOSFET in Compatible with Current-Sensing MOSFETs approximately 550 ns. The MIC5021 then supplies a limited current (<2 mA), if necessary, to maintain the Current-Source Drive Reduces EMI output state. Applications An overcurrent comparator with a trip voltage of 50 mV Lamp Control makes the MIC5021 ideal for use with a current-sens- Heater Control ing MOSFET. An external low value resistor may be Motor Control used instead of a sensing MOSFET for more precise overcurrent control. An optional external capacitor Solenoid Switching placed from the C pin to ground may be used to con- T Switch-Mode Power Supplies trol the current shutdown duty cycle (dead time) from Circuit Breaker 20% to <1%. A duty cycle from 20% to about 75% is possible with an optional pull-up resistor from C to T V . Additional parts of the MIC502x family include the DD MIC5020 low-side driver and the MIC5022 half-bridge driver with a cross-conduction interlock. The MIC5021 is available in 8-pin SOIC and plastic DIP packages. Typical Application Circuit MIC5021 PDIP & SOIC High-Side Driver with Overcurrent Trip and Retry +12V to +36V MIC5021 1 8 10F V V DD BOOST 2 7 N-CHANNEL TTL INPUT INPUT GATE POWER MOSFET 3 6 C SENSE- T 2.7 OPTIONAL* 4 5 nF GND SENSE+ R SENSE 50mV R SENSE = I TRIP LOAD * INCREASES TIME BEFORE RETRY 2016 Microchip Technology Inc. DS20005677A-page 1MIC5021 Package Types MIC5021 MIC5021 SOIC PDIP Top View Top View 1 V V 8 1 V V 8 DD BOOST DD BOOST GATE INPUT 2 INPUT 7 2 GATE 7 SENSE- SENSE- C C 3 6 3 6 T T 4 GND SENSE+ 5 4 GND SENSE+ 5 Functional Block Diagram 6V INTERNAL REGULATOR I 1 FAULT C T C V INT NORMAL DD 2I 1 CHARGE V BOOST PUMP Q1 SENSE+ 15V SENSE- ON 50mV OFF 6V ONE- 10I I GATE 2 2 INPUT SHOT TRANSISTOR: 106 DS20005677A-page 2 2016 Microchip Technology Inc.