LP3913 datasheet(37/70 Pages) TI1

37 / 70 page

Li-Ion Cell

USBPWR

VDD

VBATT

CHG_DET

Adapter

USB

LP3913

www.ti.com

SNVS489I – NOVEMBER 2006 – REVISED SEPTEMBER 2013

Charge Status Indication

Two LEDs connected to the LP3913 are used to indicate the status of the charging. The CHG pin is connected to

a red LED that is enabled when an external power source is connected and the battery is charging. The second

STAT pin is connected to a green LED. When the battery charging transitions from CC to CV mode, then the

green LED is blinking with a 50% duty cycle and a period of 1 second. When the battery is fully charged, then the

green LED is always on.

Both LEDs are off when there is no external power connected.

Table 3. Truth Table for the LED Status Indicators

Condition

RED LED

GREEN LED

No Charger or USB

OFF

Charger off

OFF

Pre-Qualification

OFF

Constant Current CC

OFF

Constant Voltage CV

50% duty cycle

EOC / Top-OFF charging

Charge cycle complete

ERROR (Battery Temp, Thermal shutdown)

50% duty cycle

OFF

Safety Timer Expired

50% duty cycle

OFF

50% duty cycle indicates the LED is pulsed on/off for equal times at a frequency of 1 Hz.

The RED pin and GREEN pin are connected to a regulated driver to ensure that the brightness is independent

from the external power. The LEDs need to be connected between the CHG / STAT pins and GND.

Thermal Charger Power FET Regulation

The internal power FET Q2 in the linear charger module is thermally regulated to the junction temperature of

115°C to ensure optimal charging of the battery. The charge current is limited by the charge current selected in

the Charger Control Register but is also thermally limited to prevent the junction from overheating during high

charge currents at high ambient temperatures as the package power dissipation is limited.

Thermal regulation ensures maximum charge current and superior charge rate without exceeding the power

dissipation limits of LP3913.

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