MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER

MP2610 Rev. 0.91

www.MonolithicPower.com

5

7/13/2010

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PIN FUNCTIONS

Pin #

Name

Description

1

NTC

Thermistor Input. Connect a resistor from this pin to the pin VREF33 and the Thermistor

from this pin to ground.

2

ACOK

Valid Input Supply Indicator. A logic LOW on this pin indicates the presence of a valid

input supply.

3

CHGOK

Charging Completion Indicator. A logic LOW indicates charging operation. The pin will

become an open drain once the charging is completed or suspended.

4

VREF33

Internal linear regulator 3.3V reference output. Bypass to GND with a 1μF ceramic

capacitor.

5

VREF25

Internal linear regulator 2.5V reference output.

6

EN

On/Off Control Input.

7

CELLS

Command Input for the Number of Li-Ion Cells. Connect this pin to VREF33 for 2-cell

operation or ground the pin for 1-cell operation. Do not leave this pin float.

8

COMPV

V-LOOP Compensation. Connect this pin with a capacitor and a resistor.

9

COMPI

I-LOOP Compensation. Connect this pin with a capacitor and a resistor.

10

BATT

Positive Battery Terminal.

11

CSP

Battery Current Sense Positive Input. Connect a resistor RS1 between CSP and BATT.

The full charge current is:

()

()

mΩ

RS1

200mV

A

I

CHG

=

.

12

GND,

Exposed

Pad

Ground. This pin is the voltage reference for the regulated output voltage. For this reason

care must be taken in its layout. This node should be placed outside of the switching

diode (D2) to the input ground path to prevent switching current spikes from inducing

voltage noise into the part. Connect exposed pad to ground plane for optional thermal

performance.

13

TMR

Set time constant. 0.1μA current charges and discharges the external cap.

14

BST

Bootstrap. This capacitor is needed to drive the power switch’s gate above the supply

voltage. It is connected between SW and BS pins to form a floating supply across the

power switch driver.

15

SW

Switch Output.

16

IN

Supply Voltage. The MP2610 operates from a 5V to 24V unregulated input to charge 1~2

cell li-ion battery. Capacitor is needed to prevent large voltage spikes from appearing at

the input.