MIC4609 datasheet(14/34 Pages) MICROCHIP

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MIC4609

DS20005531A-page 14

 2016 Microchip Technology Inc.

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

SOICW-28LD

Symbol

I/O

Description

1VDD

Power Input Supply for Gate Drivers

Decouple this pin to VSS with a > 2.2 µF capacitor.

Connect anode of bootstrap diodes to this pin.

AHI

A-Phase High-Side Drive Input

BHI

B-Phase High-Side Drive Input

CHI

C-Phase High-Side Drive Input

ALI

A-Phase Low-Side Drive Input

BLI

B-Phase Low-Side Drive Input

CLI

C-Phase Low-Side Drive Input

8FAULT

OUT

Fault Output

Open drain asserts low to indicate Overcurrent or VDD Undervoltage condition.

ISNS

Current Sense Input for Overcurrent Shutdown

Enable Input

Logic high on the Enable pin results in normal operation.

Logic low forces the device to enter Shutdown mode.

RCIN

OUT

Overcurrent Fault Clear Delay Pin

Connect to an external capacitor to set the fault clear delay.

VSS

GND

Logic Ground Pin

COM

—

Low-Side Driver Return Pin

CLO

OUT

C-Phase Low-Side Drive Output

Connect to the gate of the external low-side power MOSFET or IGBT.

BLO

OUT

B-Phase Low-Side Drive Output

Connect to the gate of the external low-side power MOSFET or IGBT.

ALO

OUT

A-Phase Low-Side Drive Output

Connect to the gate of the external low-side power MOSFET or IGBT.

17, 21, 25

—

No Connect

CHS

—

C-Phase High-Side Drive Return Connection

Connect to the emitter or source of the external high-side power device.

Connect the bootstrap capacitor between this pin and the CHB pin.

CHO

OUT

C-Phase High-Side Drive Output

Connect to the gate of the external high-side power MOSFET or IGBT.

CHB

Power C-Phase High-Side Bootstrap Supply

External bootstrap capacitor is required.

Connect the bootstrap capacitor between this pin and CHS.

Connect to the anode of the external bootstrap diode.

BHS

—

B-Phase High-Side Drive Return Connection

Connect to the emitter or source of the external high-side power device.

Connect the bootstrap capacitor between this pin and the BHB pin.

BHO

OUT

B-Phase High-Side Drive Output

Connect to the gate of the external high-side power MOSFET or IGBT.

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