MP2602 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE

MP2602 Rev.1.3

www.MonolithicPower.com

6

1/25/2010

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BLOCK DIAGRAM

BATTERY

CHARGE

CONTROL

7

9

8

5

1

10

2

3

6

4

SS

ISET

IBF

NTC

R1

IN

BATT

CHG

ACOK

GND

EN

+

_

OFF ON

Figure 1—Functional Block Diagram

OPERATION

Input Voltage Range

The MP2602 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 2.5V or higher than 6.0V.

an

input

power

good

condition

(i.e.

than the battery voltage, the IC 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 MP2602. Figure 3 shows the

typical charging procedure. For a fully depleted

battery with a terminal voltage lower than 2.6V,

the MP2602 will start with the trickle charge

(preconditioning) at 10% of the programmed full

charge current. After the battery voltage

reaches 2.6V, the charger 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 constant

voltage (CV) mode until the battery is fully

charged. The charge current drops during CV

mode, and the battery full indication is set when

the charge current in the CV mode is reduced