MP26028 datasheet(8/11 Pages) MPS

8 / 11 page

MP26028 – 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE

MP26028 Rev.1.01

www.MonolithicPower.com

10/28/2011

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

2.6V

4.2V

VBATT

10% of ICHG

IBF

Trickle

Charging

Complete

Charging

ICHG

IBATT

Figure 2—Typical Charging Profile

Trickle

Charging

Charge

Start

Charge

End

Soft-Start

Time

Mode

10% of ICHG (IBF)

90% of ICHG

ICHG

2.6V

4.2V

VBATT

IBATT

CHG

Figure 3—Typical Charging Procedure

Battery Over-Voltage Protection and

Automatic Recharge

At any time when VBATT is 50mV higher than the

trimmed charge target, the MP26028 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.

See Table 1 and Figure 4. The relationship of

the charge current and the programming

resistance is established by:

CHR

CHG





(A)

Table 1—RPGM and ICHG Relationship

RCHG (kΩ)

ICHG (mA)

2.32

700

2.74

600

3.3

500

4.12

400

5.6

300

Charge Current vs

1/RPGM Resistance

1000

900

800

700

600

500

400

300

200

0.2

0.1

0.3 0.4

0.6 0.7

0.5

Figure 4—Charge Current vs 1/RPGM

Resistance

The recommended resistance for programming

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

battery full charge current threshold (IBF) is

programmed by connecting a resistor RBF from

the IBF pin to GND:







Where 2RCHG<RBF<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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