MP2631 datasheet(7/9 Pages) MPS

7 / 9 page

MP2631–28V, 1A LINEAR LI-ION BATTERY CHARGER WITH 10MA HIGH VOLTAGE LDO

MP2631 Rev.0.9

www.MonolithicPower.com

9/15/2008

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

BLOCK DIAGRAM

BATTERY

CHARGE

CONTROL

VIN

LDO

ISET

RPGM

Battery

SHDN

SS/NC

ACOK

CHG

GND

Figure 1—Functional Block Diagram

OPERATION

Input Voltage Range

The MP2631 has built-in input voltage surge

protection as high as +28V. The charger IC will

be automatically disabled when the input

voltage is lower than 2.1V or higher than 7.0V.

For MP2631, the open-drain pin ACOK is

used to indicate an input power good condition

(i.e. 3.5V<VIN<6.5V). If the input voltage is lower

than the battery voltage, the charge function is

also disabled to prevent the battery from

draining.

Charge Cycle (Mode Change: Trickle->CC-> CV)

Figure 2 below shows the typical charging

profile for the MP2631. It begins charging at the

constant current of the programmed value

(ICHG). This is referred to as Constant Current

(CC) mode. For a deeply discharged battery, it

will start trickle at 10% of the programmed

charge current until battery voltage reaches

2.6V. Once the battery voltage reaches 4.2V,

the charger will operate in the constant voltage

(CV) charge mode. The charge current drops

during CV mode, and the battery full indication

is set when the charge current reduces to the

battery full value (IBF) at 10% of the nominal

charge current.

2.6V

4.2V

VBATT

ICHG

10% of ICHG

IBATT

Charging

Complete

Charging

Trickle

Charging

Figure 2—MP2631 Typical Charging Profile

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