LP3913 datasheet(40/70 Pages) TI1

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LP3913

SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013

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The Safety timer resets and starts counting from zero upon the following events:

1. Power ON (through connecting valid power to either USBPWR or CHGN_IN pins).

2. Interchanging USBPWR and CHG_IN sources

3. The voltage of a charged battery drops below the restart value and the charger is enabled

4. Disabling and re-enabling of the charger by toggling bit D1 of the Charge Control Register

5. Emerging from Thermal Shutdown

6. Emerging from a battery temperature out-of-range and the charger is enabled

7. Emerging from USB suspend mode when charging with USB power

Charging Maintenance

When a fully charged battery is being loaded by the system while the external power is present and while bit D1

in the charge control register is set to a 1 (Charge enable) then the charging will restart when the battery voltage

drops below the charging restart threshold. The value of the threshold depends on the termination voltage

according to the following table:

Vterm

Charging restart voltage

4.1V

3.9V

4.2V

4.0V

4.38V

4.2V

CHSPV Register (02)h Charger Supervisor Register

D7–6

D2–0

Access

Read only

r/w

Data

Reserved

LED Current

LED ENABLE

Battery

Charger status

0: Disabled

temperature

1:Enabled

range

0: 5 mA

0: 0°C–50°C

Stat2

Stat1

Stat0

1: 10 mA

1: 0°C–45°C

Charger is off

Prequalification

Constant current

charging

Constant voltage

charging

Error

Charge cycle

complete

Safety Timer

Expired

EOC / Top-off

Reset

n/a

2’b000

Power Routing

The LP3913 power can originate from three different sources: Adapter power, USB power or battery power. The

objective of the power routing is to be able to:

•

Operate the portable system from external power regardless of the battery voltage.

•

Operate the portable system from USBPWR when the battery exceeds the Full Rate Qualification Threshold

voltage (Vfullrate).

•

Concurrently charging and operating the system when external power is present

•

Seamless selection of Adapter or USB power as the primary external power source

Power Routing supports 4 modes:

1. A regulated external adapter power is present and concurrently supplies the system power and the battery

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