MCP73123T datasheet(13/34 Pages) MICROCHIP

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DS22191A-page 13

MCP73123/223

3.0

PIN DESCRIPTION

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

TABLE 3-1:

PIN FUNCTION TABLES

3.1

Battery Management Input Supply

(VDD)

A supply voltage of [VREG (Typical) + 0.3V] to 6.0V is

recommended for MCP73123, while a supply voltage

of [VREG (Typical) + 0.3V] to 12.0V is recommended for

MCP73223. Bypass to VSS with a minimum of 1 µF.

The VDD pin is rated 18V absolute maximum to prevent

suddenly rise of input voltage from spikes or low cost

ac-dc wall adapter.

3.2

Battery Charge Control Output

(VBAT)

Connect to the positive terminal of the battery. Bypass

to VSS with a minimum of 1 µF to ensure loop stability

when the battery is disconnected. The MCP73123 is

designed to provide 3.6V battery regulation voltage for

LiFePO4 batteries. Undercharge may occur if a typical

Li-Ion or Li-Poly battery is used.

3.3

No Connect (NC)

No connect.

3.4

Status Output (STAT)

STAT is an open-drain logic output for connection to an

LED for charge status indication in standalone

applications. Alternatively, a pull-up resistor can be

applied for interfacing to a host microcontroller. Refer to

Table 5-1 for a summary of the status output during a

charge cycle.

3.5

Battery Management 0V Reference

(VSS)

Connect to the negative terminal of the battery and

input supply.

3.6

Current Regulation Set (PROG)

The fast charge current is set by placing a resistor from

PROG to VSS during constant current (CC) mode.

PROG pin also serves as charge control enable.

When a typical 200 k

Ω impedance is applied to PROG

pin, the MCP73123/223 is disabled until the high

impedance

removed.

Refer

Section 5.5

“Constant Current MODE - Fast Charge” for details.

3.7

Exposed Pad (EP)

The Exposed Thermal Pad (EP) shall be connected to

the exposed copper area on the Printed Circuit Board

(PCB) for the thermal enhancement. Additional vias on

the copper area under the MCP73123/223 device can

improve the performance of heat dissipation and

simplify the assembly process.

MCP73123/223

Symbol

I/O

Description

DFN-10

1, 2

VDD

Battery Management Input Supply

3, 4

VBAT

I/O

Battery Charge Control Output

5, 6

No Connection

STAT

Battery Charge Status Output

8, 9

VSS

Battery Management 0V Reference

PROG

I/O

Battery Charge Current Regulation Program and Charge Control Enable

—

Exposed Pad

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