MP2606 datasheet(7/10 Pages) MPS

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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.

2.6V

4.2V

VBATT

10% of ICHG

IBFL

Charging

Complete

Charging

ICHG

IBATT

Figure 2—MP2606 Typical Charging Profile

Charge

Start

Charge

End

Soft-Start

Time

Mode

10% of ICHG (IBFL)

90% of ICHG

ICHG

4.2V

VBATT

IBATT

CHG

Figure 3—MP2606 Typical Charging

Procedure

Battery Over-Voltage Protection and

Automatic Recharge

At any time when VBATT is 50mV higher than the

trimmed charge target, the MP2606 reduces its

charge current to 0µA. This ensures the safety

of the battery. Also, the CV control loop always

monitors the battery voltage such that it will

automatically recharge the battery when it is

depleted below the target level.

Programming of Charge Current and Battery

Full Current

The charge current (ICHG) is set by a resistor

(RCHG) 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—RCHG and ICHG Relationship

RCHG (kΩ)

ICHG (mA)

1.82

913

835

2.16

778

2.5

677

3.32

521

4.32

410

357

7.5

236

8.45

208

176

Charge Current vs

1/RCHG Resistance

1000

900

800

700

600

500

400

300

200

0.00

0.20

0.10

0.30 0.40

0.60

0.50

1/RCHG

100

Figure 4—Charge Current vs 1/RCHG

Resistance

The recommended resistance for programming

the charge current is 2.3kΩ<RCHG<11kΩ. The

battery full charge current threshold (IBFL) is

programmed by connecting a resistor RBFL from

the IBFL pin to GND:

(1)

BFL

1.7kΩ

(2)

BFL

BFH

//R

1.7kΩ

Where 2RCHG<RBFL<10RCHG. 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 a floating pin.

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