MCP73837-AMISLASHMF datasheet(13/36 Pages) MICROCHIP

13 / 36 page

 2007-2015 Microchip Technology Inc.

DS20002071C-page 13

MCP73837/8

3.0

PIN DESCRIPTION

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

TABLE 3-1:

PIN FUNCTION TABLE

3.1

AC Adapter Supply Input (VAC)

A supply voltage of VREG + 0.3V to 6V from the AC/DC

wall-adapter is recommended. When both the AC

adapter and the USB port supply voltages are present

at the same time, the AC adapter dominates the regu-

lated 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 the 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

microcontroller.

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 the negative terminal of the battery and

input supply.

3.6

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

 is applied to

PROG1. When PROG1 is floating, the MCP73837/8

enters into Stand-By mode.

Pin Number

Symbol I/O

Function

DFN-10

MSOP-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 (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 PCB.

MCP73837-AMI/MF Datasheet(PDF) 13 Page - Microchip Technology

MCP73837-AMI/MF Datasheet(HTML) 13 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

Datasheet Download

Link URL