MCP73837AMIMF datasheet(13/30 Pages) MICROCHIP

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DS22071A-page 13

MCP73837/8

3.0

PIN DESCRIPTION

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

TABLE 3-1:

PIN FUNCTION TABLES

3.1

AC-Adapter Supply Input (VAC)

A supply voltage of VREG + 0.3V to 6V from ac-dc wall-

adapter is recommended. When both the AC-Adapter

and the USB-Port supply voltages are present at same

time, the AC-Adapter dominates the regulated charge

current with the maximum value of 1A. Bypass to VSS

with a minimum of 4.7 µF is recommended.

3.2

USB-Port Supply Input (VUSB)

A supply voltage of VREG + 0.3V to 6V from USB-Port is

recommended. When no supply voltage from VAC pin is

available, the Li-Ion battery is charged directly from

USB-Port. Bypass to VSS with a minimum of 1 µF is

recommended.

3.3

Charge Status Output 1 (STAT1)

STAT1 is an open-drain logic output for connection to a

LED for charge status indication. Alternatively, a pull-up

resistor can be applied for interfacing to a host micro-

controller.

3.4

Charge Status Output 2 (STAT2)

STAT2 is an open-drain logic output for connection to a

LED for charge status indication. Alternatively, a pull-up

resistor can be applied for interfacing to a host

microcontroller.

3.5

Battery Management 0V Reference

(VSS)

Connect to negative terminal of battery and input

supply.

3.6

Battery Charge Control Output

(VBAT)

Connect to the positive terminal of Li-Ion / Li-Polymer

batteries. Bypass to VSS with a minimum of 1 µF to

ensure loop stability when the battery is disconnected.

3.7

AC-Adapter Current Regulation

Set (PROG1)

The AC-Adapter constant charge current is set by

placing a resistor from PROG1 to VSS. PROG1 is the

set point of precondition and termination when the AC-

Adapter is present.

PROG1 also functions as device charge control

enable. The MCP73837/8 is shut down when an

impedance value greater than 70 k

Ω is applied to

PROG1. When PROG1 is floating, the MCP73837/8

enters stand-by mode.

Pin Number

Symbol

I/O

Function

MSOP-10

DFN-10

VAC

AC-Adapter Supply Input

VUSB

USB-Port Supply Input

STAT1

Charge Status Output 1 (Open-Drain)

STAT2

Charge Status Output 2 (Open-Drain)

VSS

—

Battery Management 0V Reference

PROG1

I/O

Current Regulation Setting With AC-Adapter; Device Charge

Control Enable; Precondition Set Point for AC control

PROG2

Current Regulation Setting With USB-Port; Precondition Set Point

for USB control.

Available on MCP73837: Power-Good Status Output (Open-Drain)

Available on MCP73838: Timer Enable; Enables Safety Timer

(Active Low)

THERM

I/O

Thermistor Monitoring Input and Bias current; System Test (LDO)

Mode Input

VBAT

I/O

Battery Positive Input and Output Connection

—EP

VSS

—

EP (Exposed Thermal Pad); There is an internal electrical

connection between the exposed thermal pad and VSS. The EP

must be connected to the same potential as the VSS pin on the

Printed Circuit Board (PCB).

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