MIC4607 datasheet(13/42 Pages) MICROCHIP

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DS20005610A-page 13

MIC4607

3.0

PIN DESCRIPTIONS

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

TABLE 3-1:

QFN PIN FUNCTION TABLE

Pin Number

QFN

Pin Name

Description

MIC4607-1

MIC4607-2

BHI

BPWM

High-side input (-1) or PWM input (-2) for Phase B.

ALI

Low-side input (-1) or no connect (-2) for Phase A.

AHI

APWM

High-side input (-1) or PWM input (-2) for Phase A.

4EN

Active high enable input. High input enables all outputs and initiates

normal operation. Low input shuts down device into a low LQ mode.

5FLT/

FLT/

Open Drain. FLT/ pin goes low when outputs are latched off due to an

overcurrent event. Must be pulled-up to an external voltage with a

resistor.

BHB

Phase B High-Side Bootstrap Supply. An external bootstrap capacitor

is required. Connect the bootstrap capacitor across this pin and BHS.

An on-board bootstrap diode is connected from VDD to BHB.

BHO

Phase B High-Side Drive Output. Connect to the gate of the external

high-side power MOSFET.

BHS

Phase B High-Side Driver Return. Connect to the bootstrap capacitor

and to a resistor that connect to the source of the external MOSFET.

See the Applications section for additional information on the resistor.

BLO

Phase B Low-Side Drive Output. Connect to the gate of the low-side

power MOSFET gate.

No Connect.

ILIM-

Differential Current-Limit Input. Connect to most negative end of the

external current-sense resistor.

VSS

Power Ground for Phase A and Phase B.

ILIM+

Differential Current-Limit Input. Connect to most positive end of the

external current-sense resistor.

ALO

Phase A Low-Side Drive Output. Connect to the gate of the low-side

power MOSFET gate.

AHS

Phase A High-Side Driver Return. Connect to the bootstrap capacitor

and to a resistor that connect to the source of the external MOSFET.

See the Applications section for additional information on the resistor.

AHO

Phase A High Side Drive Output. Connect to the gate of the external

high-side power MOSFET.

AHB

Phase A High-Side Bootstrap Supply. An external bootstrap capacitor

is required. Connect the bootstrap capacitor across this pin and AHS.

An on-board bootstrap diode is connected from VDD to AHB.

VDD

Input Supply for Gate Drivers and Internal Logic/Control Circuitry.

Decouple this pin to VSS with a minimum 2.2 μF ceramic capacitor.

DLY

Fault Delay. Connect an external capacitor from this pin to ground to

increase the current-limit reset delay. Leave open for minimum delay.

Do not externally drive this pin.

VSS

Phase C Power and Control Circuitry Ground.

CLO

Phase C Low-Side Drive Output. Connect to the gate of the low-side

power MOSFET gate.

CHS

Phase C High-Side Driver Return. Connect to the bootstrap capacitor

and to a resistor that connect to the source of the external MOSFET.

See the Applications section for additional information on the resistor.

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