MIC5021 查看數據表（PDF） - Microchip Technology

零件编号

产品描述 (功能)

生产厂家

MIC5021

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

Microchip Technology 

MIC5021

High-Speed, High-Side MOSFET Driver with Charge Pump

and Overcurrent Limit

Features

• 12V to 36V Operation

• 550 ns Rise/Fall Time Driving 2000 pF

• TTL-Compatible Input with Internal Pull-Down

Resistor

• Overcurrent Limit

• Gate-to-Source Protection

• Internal Charge Pump

• 100 kHz Operation Guaranteed Over Full Tem-

perature and Operating Voltage Range

• Compatible with Current-Sensing MOSFETs

• Current-Source Drive Reduces EMI

Applications

• Lamp Control

• Heater Control

• Motor Control

• Solenoid Switching

• Switch-Mode Power Supplies

• Circuit Breaker

General Description

The MIC5021 high-side MOSFET driver is designed to

operate at frequencies up to 100 kHz (5 kHz PWM for

2% to 100% duty cycle) and is an ideal choice for high

speed applications such as motor control, SMPS

(switch mode power supplies), and applications using

IGBTs. The MIC5021 can also operate as a circuit

breaker with or without automatic retry.

A rising or falling edge on the input results in a current

source pulse or sink pulse on the gate output. This out-

put current pulse can turn on a 2000 pF MOSFET in

approximately 550 ns. The MIC5021 then supplies a

limited current (<2 mA), if necessary, to maintain the

output state.

An overcurrent comparator with a trip voltage of 50 mV

makes the MIC5021 ideal for use with a current-sens-

ing MOSFET. An external low value resistor may be

used instead of a sensing MOSFET for more precise

overcurrent control. An optional external capacitor

placed from the CT pin to ground may be used to con-

trol the current shutdown duty cycle (dead time) from

20% to <1%. A duty cycle from 20% to about 75% is

possible with an optional pull-up resistor from CT to

VDD. Additional parts of the MIC502x family include the

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

10μF

TTL INPUT

OPTIONAL*

MIC5021

1

8

V DD V BOOST

2

INPUT

7

GATE

3

CT

4

GND

6

SENSE-

5

SENSE+

N-CHANNEL

POWER MOSFET

2.7

nF

RS E N S E

LOAD

RS E N S E

=

50mV

IT R I P

* INCREASES TIME BEFORE RETRY

 2016 Microchip Technology Inc.

DS20005677A-page 1

Share Link: