MIC5022BWM datasheet(2/10 Pages) MICREL

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MIC5022

Micrel, Inc.

MIC5022

July 2005

Pin Description

DIP Pin No.

SOIC Pin No.

Pin Name

Pin Function

VDD

Supply: +12V to +36V. Decouple with ≥ 10µF capacitor.

Input

TTL Compatible Input: Logic high turns the high-side external MOSFET

on and the low-side external MOSFET off. Logic low turns the high-side

external MOSFET off and the low-side external MOSFET on. An internal

pull-down returns an open pin to logic low.

Fault

When either sense voltage exceeds threshold, open collector output is open

circuit for 5µs (tG(ON)), then pulled low for tG(OFF). tG(OFF) is adjustable from

CT.

CTH

Retry Trimming Capacitor, High Side: Controls the off time (tG(OFF)) of the

overcurrent retry cycle. (Duty cycle adjustment.)

• Open = approx. 20% duty cycle.

• Capacitor to Ground = approx. 20% to < 1% duty cycle.

• Pullup resistor = approx. 20% to approx. 75% duty cycle.

• Ground = maintained shutdown upon overcurrent condition.

Enable

Output Enable: Disables operation of the output drivers; active high. An

internal pull-down returns an open pin to logic low.

CTL

Retry Trimming Capacitor, Low Side: Same function as CTH.

Gnd

Circuit Ground

Sense L +

Current Sense Comparator (+) Input, Low Side: Connect to source of low-

side MOSFET. A built-in offset (nominal 50mV) in conjunction with RSENSE

sets the load overcurrent trip point.

Sense L –

Current Sense Comparator (–) Input, Low Side: Connect to the negative

side of the low-side sense resistor.

Gate L

Gate Drive, Low Side: Drives the gate of an external power MOSFET. Also

limits VGS to 15V max. to prevent Gate to Source damage. Will sink and

source current.

Sense H +

Current Sense Comparator (+) Input, High Side: Connect to source of high-

side MOSFET. A built-in offset (nominal 50mV) in conjunction with RSENSE

sets the load overcurrent trip point.

Source H –

Current Sense Comparator (–) Input, High Side: Connect to the negative

side of the high-side sense resistor.

Gate H

Gate Drive, High Side: Drives the gate of an external power MOSFET. Also

limits VGS to 15V max. to prevent Gate to Source damage. Will sink and

source current.

VBOOST

Charge Pump Boost Capacitor: A bootstrap capacitor from VBOOST to

the MOSFET source pin supplies charge to quickly enhance the external

MOSFET’s gate .

Pin Conﬁguration

DIP Package

SOIC Package

(N)

(WM)

VDD

VBOOST

Input

Fault

CTH

Enable

CTL

Gnd

Gate H

Sense H–

Sense H+

Gate L

Sense L–

Sense L+

VDD

VBOOST

Input

Fault

CTH

Enable

CTL

Gnd

Gate H

Sense H–

Sense H+

Gate L

Sense L–

Sense L+

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