RT5072 datasheet(39/68 Pages) RICHTEK

39 / 68 page

RT5072

DS5072-00

March 2015

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

When external EN pin go high, WAKE UP impulse would be masked off. WAKE impulse width 90ms can not be cut by

EN = H

90ms

WAKE

No WAKE

impulse

BAT plug in

BAT exists

VIN plug in

BAT/VIN plug in

ISETA [3:0]

RT5072 allows user to set the battery charge current level and the list as below. The default

value is 0.5A.

Code

BAT Charge

Current

Code

BAT Charge

Current

Code

BAT Charge

Current

Code

BAT Charge

Current

0000

0.1A

0001

0.2A

0010

0.3A

0011

0.4A

0100

0.5A

0101

0.6A

0110

0.7A

0111

0.8A

1000

0.9A

1001

1010

1.1A

1011

1.2A

1100

1.2A

1101

1.2A

1110

1.2A

1111

1.2A

CDP/DCP

Suspend Mode

When USUS = 1, the charger will enter Suspend Mode. In Suspend Mode, the CHG pin is high impedance and

IUSUS(MAX) < 300

μA.

Charging Current Decision

The charge current can be set according to the I

2C register A8.ISETA [3:0] setting :

VIN

90ms

3.1V

BAT

WAKE

BAT > 3.1V

VIN > 3.75V when BAT >3.1V

WAKE UP

3.1V

20ms

90ms

3.75V

VIN > 3.75V

2.82V

< 90ms

20ms

90ms

300ms

20ms

BAT <2.82V (3.1V–0.28V)

When VIN <3.15V (3.75V-0.24V)

Disable WAKE Up Suddenly

RT5072 needs 300mSec to

do charging type detection

after VIN plug in and larger

than threshold.

20ms

90ms

3.1V

20ms

BAT > 3.1V

WAKE go low

as VIN go low

3.51V

BAT > 3.1V

WAKE Up



BAT > 3.1V

WAKE Up



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