MCP1631VHVT-ESLASHST datasheet(16/34 Pages) MICROCHIP

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MCP1631/HV/MCP1631V/VHV

DS22063B-page 16

3.7

Analog Ground (AGND)

Quiet or analog ground, connect to analog ground

plane to minimize noise on sensitive MCP1631

circuitry.

3.8

No Connection (NC)

No connection.

3.9

Input Voltage (VIN)

High voltage input for MCP1631HV/MCP1631VHV

devices, operates from 3.5V to 16V input supply.

3.10

Analog supply Input (AVDD_IN)

Analog bias input, minimum 3.0V to 5.5V operation for

MCP1631/MCP1631V devices.

3.11

Analog Supply Output (AVDD_OUT)

Regulated VDD output used to power internal

MCP1631 HV/MC P 16 31VHV a nd extern al

microcontroller, supplies up to 250 ma of bias current at

3.3V or 5.0V regulated low drop out rail.

3.12

Voltage Sense Input (VSIN)

Voltage sense amplifier (A3) input, connect to high

impedance battery voltage resistor divider to sense

battery voltage with minimal loading.

3.13

Current Sense Input (ISIN)

Connect to SEPIC secondary side sense resistor to

develop a regulated current source used to charge

multi-chemistry batteries.

3.14

Voltage Sense Output (VSOUT)

Voltage

sense

amplifier

output,

connect

microcontroller analog to digital converter to measure

battery voltage.

3.15

Current Sense Output (ISOUT)

Current sense amplifier output, connect to error

amplifier (A1) inverting input (FB) to regulate SEPIC

output current.

3.16

Error Amplifier Output (COMP)

Error amplifier (A1) output, connect control loop

compensation from FB input to COMP output pin.

3.17

Feedback (FB)

Error amplifier input (A1), connect to current sense

output amplifier (A2) to regulate current.

3.18

Current Sense or Voltage Ramp

(CS/VRAMP)

For MCP1631/MCP1631HV applications, connect to

low side current sense of SEPIC switch for current

mode control and peak current limit. For MCP1631/

MCP1631HV application, connect artificial ramp

voltage to VRAMP input for voltage mode PWM control.

3.19

Power VDD (PVDD)

Power VDD input, VEXT gate drive supply input, connect

to +5.0V or +3.3V supply for driving external MOSFET.

3.20

External Driver (VEXT)

High current driver output used to drive external

MOSFET at high frequency, capable of 1A peak

currents with +5.0V PVDD.

3.21

Exposed PAD 4x4 QFN (EP)

There is an internal electrical connection between the

Exposed Thermal Pad (EP) and the AGND pin; they

must be connected to the same potential on the Printed

Circuit Board (PCB).

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