MP26058-28V, 1A LI + LINEAR BATTERY CHARGER WITH TIMER AND LDO MODE

MP26058 Rev. 0.91

www.MonolithicPower.com

7

1/25/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

BLOCK DIAGRAM

BATTERY

CHARGE

CONTROL

8

9

4

1

10

3

2

5

6

TMR

ISET

NTC

7

IBF

R1

IN

BATT

CHG

8.2V

8.2V

ACOK

GND

SHDN

+

_

OFF

ON

Figure 1—Functional Block Diagram

OPERATION

Input Voltage Range

The MP26058 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 2.2V or higher than 7.0V.

For MP26058, the open-drain pin

ACOK is

used to indicate an input power good condition

than the battery voltage, the IC is also disabled

to prevent the battery from draining.

Charge Cycle (Mode Change: CC-> LDO)

Figure 2 below shows the typical charging

profile for the MP26058. It begins charging at

the constant current of the programmed value

(CC) mode. Once the battery voltage reaches

4.2V, the charger will operate in the LDO mode

to keep the battery is fully charged. The charge

current drops during LDO mode, and the

battery full indication is set when the charge

current reduced to the preset value based on

if the battery is still not reaching IBF condition,

the on-chip timer will terminate the charger to

prevent charging the dead battery for excessive

long time and the fault condition will be flagged

by flashing the CHG LED.

4.2V

IBF

IBF

C.C

Charging

C.V

Charging

Figure 2—MP26058 Typical Charging Profile