MP2626 – SINGLE CELL LI-ION SWITCHING CHARGER WITH USB OTG

MP2626 Rev. 1.0

www.MonolithicPower.com

14

2/28/2015

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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

Input pin to detect the presence of valid input power. Pulling this pin to GND will turn off the IN-

to-PMID pass through MOSFET.

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 on this pin indicates the presence of a valid power

supply.

9

FB

Boost Output Voltage Feedback.

10

NTC

Negative Temperature Coefficient (NTC) Thermistor.

11

ISET

Programmable Charge Current Pin. Connect an external resistor to GND to program the

charge current.

12

OLIM

Programmable Output-Current Limit for boost mode. Connect an external resistor to GND to

program the system current in boost mode.

13

AGND Analog Ground

14

VB

Programmable Battery-Full Voltage. Leave floating or connect to logic HIGH for 4.2V, while

Connect to GND for 3.6V.

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 is an open drain pin

during charge mode or sleep mode.

18

CHG

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

Charge Completion indicator. Logic LOW indicates charge mode. This is an open drain pin

during charge complete or suspended.

19

PGND,

Exposed

Pad

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

20

SW

Switch Output Node. It is recommended not to place vias on the SW plane during PCB layout.

21, 22

PMID

Connect Point of Blocking Switch and High-side switch. A minimum of 22μF ceramic cap is

required to be placed as close as possible to the PMID and GND pins.

23

MODE Mode Select. Logic HIGH→boost mode. Logic LOW→charge mode.

24

EN

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

when ACOK

__________

is low (input power is OK)