MP2636 datasheet(10/40 Pages) MPS

10 / 40 page

MP2636 –3.0A SINGLE CELL SW MODE BATTERY CHARGER WITH PPM AND 3.0A BOOST

MP2636 Rev.1.01

www.MonolithicPower.com

5/1/2018

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

PIN FUNCTIONS

Pin #

Name

Description

Charge Current Represent. The voltage at this pin indicates the charge current to the battery

in charge mode and discharge current out of the battery in boost mode.

2, 21

Switch Output Node. It is recommended not to place Via

’s on the SW plane during PCB

layout.

3, 20,

SYS

System Output. A minimum of 22

μF ceramic cap is required to be put as close as

possible to the SYS and PGND pins. Total capacitance should NOT be lower than

μF.

4, 19,

VIN

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

VCC

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

Pin CANNOT carry any external load.

ILIM

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

charge mode.

PWIN

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

IN-to-SYS pass through MOSFET.

TMR

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

oscillator period for charge timer. Short to GND to disable the Timer function.

REG

Input voltage feedback for the 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.

ACOK

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

Valid Input Supply Indicator. Logic LOW at this pin indicates the presence of a valid power

supply.

System Voltage Feedback Input.

NTC

Negative Temperature Coefficient (NTC) Thermistor

ISET

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

OLIM

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

program the system current in Boost mode.

AGND

Analog Ground

Programmable Battery-Full Voltage. Connect to GND for 4.3V, leave floating to 4.35V, and

connect to logic HIGH for 4.2V.

BATT

Positive Battery Terminal / Battery Charge Current Sense Negative Input.

CSP

Battery Charge Current Sense Positive Input.

BOOST

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

Boost operation indicator. Logic LOW indicates boost operation. The pin becomes an open

drain when the part operates at charge mode or sleep mode.

CHG

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

Charging Completion Indicator. Logic LOW indicates charge mode. The pin becomes an

open drain once the charging has completed or is suspended.

MODE

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

__________

is high (Input power is not available).

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