MP2604 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE

MP2604 Rev. 1.2

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 MP2604 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 7.0V.

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: CC-> CV)

Figure 2 below shows the typical charging

profile for the MP2604. Figure 3 shows the

typical charging procedure. For a depleted

battery the MP2604 will start with the constant

referred to as Constant Current (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 to the

The MP2604 can start up with heavy load and

is stable without a battery connected to the

BATT pin.