MP26028 – 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE

MP26028 Rev.1.01

www.MonolithicPower.com

4

10/28/2011

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© 2011 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

IN

Input Supply Pin. IN receives the AC adapter or USB supply voltage.

2

CHG

Open-Drain Charge Status Indicator. This pin is low during charging.

3

ACOK

Open-Drain Input ACOK Indicator. This pin is low if the voltage at the IN pin is between

2.5V and 6.5V.

4

EN

Charger IC Enable. An input “Low” signal at this pin or if the pin is floating will enable the

IC.

5

Bias Voltage for internal circuitry. To generate the bias voltage, connect a 500kΩ resistor

(R1) from this pin to the IN pin and a 100kΩ resistor (R2) from this pin to ground. Shown

in Typical Application circuit on front page

6

Exposed Pad

GND

Ground. Connect exposed pad to the GND pin

7

SS

Soft-Start Timer. Connect this pin to an external capacitor to program the soft-start

startup time using the equation:

sec

m

20

F

1

.

0

C

T

SS

SS







.

8

IBF

Charge Status Threshold Program. Connect this pin to an external resistor to program

the charge termination current or battery full charge current.

9

ISET

Constant Charge Current Program. Connect this pin to an external resistor to program

the charging current in CC Mode.

10

BATT

Charger Output.