MCP1631-ESLASHML datasheet(15/34 Pages) MICROCHIP

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DS22063B-page 15

MCP1631/HV/MCP1631V/VHV

3.0

PIN DESCRIPTIONS

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

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Power Ground (PGND)

Connect power ground return pin to power ground

plane, high peak current flows through the PGND during

the turn on and turn off the external MOSFET devices.

3.2

Shutdown Input (SHDN)

Shutdown input logic low disables device and lowers IQ

to minimum value, amplifier A3 (VS) remains functional

for battery voltage sense applications.

3.3

Oscillator Input (OSCIN)

External Oscillator Input, used to set power train

switching frequency and maximum duty cycle, VEXT

enabled while low and disabled while high.

3.4

Oscillator Disable (OSCDIS)

Oscillator disable input, used to asycnronously

terminate the VEXT duty cycle. Commonly used to

modulate current for LED driver applications.For

minimum shutdown IQ, connect OSCDIS to SHDN.

3.5

Overvoltage Input (OVIN)

Overvoltage Comparator input, connect to voltage

divider, internal comparator terminates VEXT output in

50 ns to limit output voltage to predetermined value.

3.6

External Reference Voltage Input

(VREF)

External Voltage Reference input, connect fixed or

variable external reference to VREF, with A1 configured

as an error amplifier, the power supply output variable

(voltage or current) will follow this input.

MCP1631/MCP1631V

MCP1631HV/

MCP1631VHV

Sym

Description

TSSOP/SSOP

4x4

QFN

TSSOP/SSOP

1151

PGND

Power ground return

2162

SHDN

Shutdown input

3173

OSCIN

External oscillator input

4184

OSCDIS Oscillator disable input

5195

OVIN

Overvoltage comparator input

6206

VREF

External voltage reference input

717

AGND

Quiet or analog ground

8,9,10

2,4,12

8,9

No connection

——

VIN

High voltage input

—

AVDD_IN Analog bias voltage input

——

AVDD_OUT Regulated VDD output

12512

VSIN

Voltage sense amplifier (A3) input

13613

ISIN

Current sense input

14714

VSOUT

Voltage sense amplifier output

15815

ISOUT

Current sense amplifier output

COMP

Error amplifier (A1) output

Error amplifier inverting input (A1)

CS/VRAMP CS - current sense input; VRAMP voltage ramp input

PVDD

Power VDD input

VEXT

External driver output

—

Exposed Thermal Pad (EP); must be connected to AGND

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