MIC5021 查看數據表（PDF） - Microchip Technology

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MIC5021

High-Speed, High-Side MOSFET Driver with Charge Pump and Overcurrent Limit

Microchip Technology 

MIC5021

4.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 4-1.

TABLE 4-1: PIN FUNCTION TABLE

Pin Number Pin Name

Description

1

VDD Supply (+12V to 36V). Decouple with ≥ 10 μF capacitor.

2

INPUT

TTL-Compatible Input. Logic high turns the external MOSFET on. An internal

pull-down returns an open pin logic low.

Retry Timing Capacitor. Controls the off time (tG(OFF)) of the overcurrent retry cycle

(duty cycle adjustment):

3

CT

Open = Approximately 20% duty cycle.

Capacitor-to-Ground = Approximately 20% to <1% duty cycle.

Pull-Up Resistor = Approximately 20% to approximately 75% duty cycle.

Ground = Maintained shutdown upon overcurrent condition.

4

GND Circuit Ground.

Current-Sense Comparator (+) Input. Connect to high side of sense resistor or cur-

5

SENSE+ rent sensing MOSFET sense lead. A built-in offset in conjunction with RSENSE

sets the load overcurrent trip point.

6

SENSE–

Current-Sense Comparator (–) Input. Connect to the low side of the sense resistor

(usually the high side of the load).

7

GATE

Gate Drive. Drives the gate of an external power MOSFET. Also limits VGS to 15V

maximum to prevent gate-to-source damage. Will sink-and-source current.

8

VBOOST

Charge Pump Boost Capacitor. A bootstrap capacitor from VBOOST to the FET

source pin supplies charge to quickly enhance the gate output during turn-on.

 2016 Microchip Technology Inc.

DS20005677A-page 9

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