MCP73123-22SSLASHMF datasheet(10/28 Pages) MICROCHIP

10 / 28 page

MCP73123/223

DS22191E-page 10

 2009-2013 Microchip Technology Inc.

3.0

PIN DESCRIPTION

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

TABLE 3-1:

PIN FUNCTION TABLE

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

sudden 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 stand-alone

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.

The PROG pin also serves as a charge control enable

pin. Allowing the PROG pin to float or connecting the

pin to an impedance greater than 200 k

 will disable

the MCP73123/223 charger. Refer to

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)

enhance

thermal

power

dissipation.

Additional vias on the copper area under the

MCP73123/223 device will improve the performance of

heat dissipation and simplify the assembly process.

Connecting EP to VSS is recommended.

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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