MP2681 – CC/CV CONTROLLER WITH FULL PROTECTION

MP2681 Rev.1.01

www.MonolithicPower.com

8

12/25/2013

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PIN FUNCTIONS

Package

Pin #

Name

Description

1

VDD

Power Supply Input. Bypass VDD to GND with a capacitor, at least 4.7μF.

2

NC

No Connected.

3

GND

Ground

4

VFB

Voltage feedback pin. Connect this pin to the compensation of the voltage regulation loop

externally.

5

COMP

Output pin common to voltage regulation and current limitation loops. Connect to the cathode

of the opto-coupler.

6

IFB

Current feedback. Connect to current sense resistor.

7

LEDR Charging status Indicator. (See table 3 for indication)

8

LEDG Charging status Indicator. (See table 3 for indication)

9

CR

Charge Rate Setting Pin. Pull it to logic high to set the charger in fast charge or logic low to

set the charger in slow charge. Floating this pin sets the charger in fast charge as default

setting.

10

ID

Connect to the ID resistor output pin of the battery pack. This pin is used to detect the battery

type.

11

NTC

Battery temperature monitoring pin. Please see Fig 2 for proper connection.

12

TMR

Timer setting pin. Connect a capacitor from this pin to GND to set the oscillator cycle. The

Timer setting period changes according to oscillation cycle. Short this pin to ground to

disable the timer.

13

LDO

LDO output for pulling high voltage of NTC, FLT and ID pins.

14

FLT

Drain output pin to detect a charge fault condition. . It is pulled low when any fault happens.

Connect this pin to the battery pack pin if available. Pull FLT high to LDO pin through a

resistor.

15

BATT

Battery Sense Voltage input.

16

CCON

External charge on/off control MOSFET gate control pin. This pin cuts off the charge path

when any fault happens or protection is triggered.