MP2633 – 1.5A SINGLE CELL SWITCH MODE BATTERY CHARGER

MP2633 Rev. 1.05

www.MonolithicPower.com

12

4/19/2013

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2013 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1

FREQ

Connect to GND to program the operating frequency to 600kHz. Leave floating or connect to

HIGH to program the operating frequency to 1.2MHz.

2

VIN

Adapter Input. Place a bypass capacitor close to this pin to prevent large input voltage spikes.

3

VCC

Internal Circuit Power Supply. Bypass to GND with a 100nF ceramic capacitor. This pin

CANNOT carry any load.

4

ILIM

Input Current Set. Connect to GND with an external resistor to program input current limit in

charge mode.

5

PWIN

AC Input Detect. Detect the presence of valid input power.

6

TMR

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

oscillator period. Short to GND to disable the Timer function.

7

REG

Input Voltage Feedback for input voltage regulation loop. Connect to tap of an external resistor

divider from VIN to GND to program the input voltage regulation. Once the voltage at REG pin

drops to the inner threshold, the charge current is reduced to maintain the input voltage at the

regulation value.

8

ACOK

----------------

Valid Input Supply Indicator. Logic LOW indicates the presence of a valid power supply.

9

FB

System Voltage Feedback.

10

NTC

Negative Temperature Coefficient (NTC) Thermistor.

11

ISET

Charge Current Set. Connect an external resistor to GND to program the charge current.

12

OLIM

Boost-Output-Current Limit Set. Connect an external resistor to GND to program the system

current in boost mode.

13

AGND Analog Ground

14

VB

Programmable Battery-Full Voltage. Connect to GND for 3.6V. Leave floating or connect to

logic HIGH for 4.2V.

15

BATT

Positive Battery Terminal / Battery Charge Current Sense Negative Input.

16

CSP

Battery Charge Current Sense, Positive Input.

17

BOOST

-------------------

Boost Mode Indicator. Logic LOW indicates boost mode in operation. This pin becomes an

open drain when the part operates in charge mode or sleep mode.

18

CHG

------------

Charge Completion indicator. Logic LOW indicates charge mode. The pin becomes an open

drain once the charging has completed or is suspended.

19

PGND,

Exposed

Pad

Power Ground. Connect the exposed pad and GND pin to the same ground plane.

20

SW

Switch Output Node.

21, 22

SYS

System Output. Please make sure the enough bulk capacitors from SYS to GND. Suggest

4.7uF at least.

23

MODE Mode Select. Logic HIGH→boost mode. Logic LOW→sleep mode. Active only when ACOK

__________

is

HIGH (input power is not available).

24

EN

Charge Control Input. Logic HIGH enables charging. Logic LOW disables charging. Active only

when ACOK

__________

is low (input power is OK)