4.5V < VCHG_IN < 6.0V

Charger OFF

Zero Current

Pre-Charge mode

50mA Constant current

Full-Rate Charge mode

Constant Current (ICHG)

Full-Rate Charge mode

Constant Voltage (VTERM)

Maintenance mode

Zero current

From any mode:

VCHG_IN < 4.5V

or VCHG_IN > 6.0V

or disabled via serial interface.

Yes

No

Yes

Yes

No

VBATT > 3.0V

VBATT = VTERM

ICHG < EOC

VBATT < VRSTRT

No

No

Yes

Yes

LP3918

www.ti.com

SNVS476D – AUGUST 2007 – REVISED MAY 2013

Programming Information

Table 12. Register Address 8h'12: CHGCNTL3

BIT

NAME

FUNCTION

4

VTERM[0]

Set the charging termination voltage.

See Table 5

5

VTERM[1]

Table 13. Register Address 8h'12: CHGCNTL3

BIT

NAME

FUNCTION

0

VRSTRT[0]

Set the charging restart voltage.

See Table 7

1

VRSTRT[1]

Charger Operation

The operation of the charger with EOC enabled is shown in this simplified flow diagram.

Figure 10. Simplified Charger Functional Flow Diagram (EOC is enabled)

The charger operation may be depicted by the following graphical representation of the voltage and current

profiles.

Copyright © 2007–2013, Texas Instruments Incorporated

Submit Documentation Feedback

23

Product Folder Links: LP3918