4.2V Default

VRESTART (4.10V Default)

1C

IEOC (0.15C Default)

50 mA

VFULLRATE

TIME

Battery Voltage

Charging Current

Full Rate Mode

4.2V constant voltage

Full Rate Mode

selectable constant current (C)

VBATT < VTERM

ICHG > EOC

VBATT = VTERM

ICHG 7 EOC

VBATT < VFULL_RATE

VBATT < VRESTART

Maintenance Mode

zero current

Precharge Mode

50 mA constant current

4.5V

7 VCHG_IN 7 6.8V

Charger OFF

zero current

From any mode:

or I

2

C disable received

VCHG_IN < 4.5V

or VCHG_IN > 6.8V

VBATT < VFULL_RATE

LP3923

SNVS567B – APRIL 2010 – REVISED MAY 2013

www.ti.com

TERMINATION AND RESTART

The termination and restart voltage levels are determined by the data in the VTERM[1:0] and PROG_VSTRT[1:0]

bits in the control register. The restart voltage is programmed relative to the selected termination voltage.

Figure 2. Simplified Charger Functional State Diagram (when EOC is enabled)

Figure 3. Charging Cycle Diagram

20

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