MP2606 datasheet(6/10 Pages) MPS

6 / 10 page

MP2606 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE

MP2606 Rev. 1.0

www.MonolithicPower.com

1/25/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

BLOCK DIAGRAM

BATTERY

CHARGE

CONTROL

CSS

RCHG

RBFL

BATT

CHG

ACOK

GND

VIN

CIN

COUT

VBATT

OFF ON

IBATT

RBFH

IBFH

IBFL

ISET

Figure 1—Functional Block Diagram

OPERATION

Input Voltage Range

The MP2606 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.

The open-drain pin ACOK is used to indicate

input

power

good

condition

(i.e.

2.5V<VIN<7.0V). If the input voltage is lower

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 MP2606. Figure 3 shows the

typical charging procedure. For a depleted

battery the MP2606 will start with the constant

current of the programmed value (ICHG). This is

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

programmed full battery current (IBFL). After

battery full is asserted, the output current needs

to reach IBFH threshold to re-assert ”In-charge”

status.

The MP2606 can start up with heavy load and

is stable without a battery connected to the

BATT pin.

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