MP2631 datasheet(8/9 Pages) MPS

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

MP2631 Rev.0.9

www.MonolithicPower.com

9/15/2008

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

Programming of Charge Current and Battery

Full Current

The charge current (ICHG) is set by a resistor

(RPGM) connecting from the ISET pin to GND. The

relationship of the charge current and the

programming resistance is established by the

following table and graph.

Table 1—RPGM and ICHG Relationship

RPGM (kΩ)

ICHG (mA)

1.55

1000

1.72

900

1.94

800

2.21

700

2.58

600

3.1

500

3.87

400

5.16

300

7.75

200

15.5

100

The open-drain pin CHG is used to indicate

charging status. When the battery full condition is

reached or any other condition prevents the

charger from charging, CHG will become floating

and the charge function is terminated. The

charger will begin recharging when the battery

voltage is reduced to 4.0V due to any kind of

leakage.

LDO Operation

The on-chip current limited LDO will regulate its

output at 5V for the input voltage from 5.1V to

6.5V. When VIN is below 5.1V, it will work in the

dropout mode. LDO is always ON no matter what

state of SHDN is, unless OVP is reached. It can

handle a maximum load of 10mA. A 0.1uF -1uF

cap at the output is recommended.

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