MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER

MP2605 Rev. 0.94

www.MonolithicPower.com

5

1/25/2010

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PIN FUNCTIONS

Pin #

Name

Description

1

VIN

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

2

ACOK

Open-Drain Fault Status Indicator. This pin is high under any fault conditions.

3

CHG

Open-Drain Charge Indicator. This pin is low during charging, is high after battery full

or termination, and is toggling when the battery is in fault condition.

4

TMR

Oscillator Period Timer. Connect a timing capacitor between this pin and GND to set

the oscillator period.

5

GND, Exposed

Pad

The exposed pad and GND pin must be connected to the same ground plane.

6

SHDN

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

7

SS

Soft-Start. Connect a capacitor to ground to set the soft-start time. The rising time

constant is

SS

3

C

10

400

×

×

8

ISET

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

program the charging current in CC Mode.

9

NTC

Negative Temperature Coefficient (NTC) Thermistor Pin. Connect a 500kΩ resistor

from this pin to the VIN pin and a 100kΩ NTC resistor (within the battery pack) from

this pin to ground. If NTC function is not used, replace NTC resistor with a regular

100kΩ resistor from this pin to ground. Do not leave this pin floating.

10

BATT

Charger Output.