TPS65013RGZR Datasheet, PDF(20/59 Page) Texas Instruments

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TPS65013RGZR Datasheet, PDF (20/59 Pages) Texas Instruments – POWER AND BATTERY MANAGEMENT IC

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TPS65013

SLVS517A â AUGUST 2004 â REVISED JANUARY 2005

DETAILED DESCRIPTION (continued)

bqTINY II

I(TS)

LTF

V(LTF)

HTF

V(HTF)

Pack+

Packâ

TEMP

NTC

Battery Pack

Figure 28. TS Pin Configuration

bqTINY II

LTF

HTF

I(TS)

V(LTF)

V(HTF)

Pack+

Packâ

RT1 TEMP

NTC

RT2

Battery Pack

www.ti.com

Figure 29. TS Pin Threshold

Battery Preconditioning

On power up, if the battery voltage is below the V(LOWV) threshold, the TPS65013 applies a precharge current,

I(PRECHG), to the battery. This feature revives deeply discharged cells. The charge current during this phase is

one-tenth of the value in current regulation phase which is set with IO(out) = KSET Ã V(SET)/R(SET). The load current

in preconditioning phase must be lower than I(PRECHG) and must allow the battery voltage to rise above V(LOWV)

within t(Prechg). VBAT_A is the sense pin to the voltage comparator for the battery voltage. This allows a power-on

sense measurement if the VBAT_A and VBAT_B pins are connected together at the battery.

The TPS65013 activates a safety timer, t(PRECHG), during the conditioning phase. If V(LOWV) threshold is not

reached within the timer period, the TPS65013 turns off the charger and indicates the fault condition in the

CHGSTATUS register. In the case of a fault condition, the TPS65013 reduces the current to I(DETECT). I(DETECT) is

used to detect a battery replacement condition. Fault condition is cleared by POR or battery replacement or via

the serial interface.

Battery Charge Current

TPS65013 offers on-chip current regulation. When charging from an ac adapter, a resistor connected between

the ISET1 and AGND pins determines the charge rate. A maximum of 1-A charger current from the ac adapter is

allowed. When charging from a USB port either a 100-mA or 500-mA charge rate can be selected via the serial

interface, default is 100 mA maximum. Two bits are available in the CHGCONFIG register in the serial interface

to reduce the charge current in 25% steps. These only influence charging from the ac input and may be of use if

charging is often suspended due to excessive junction temperature in the TPS65013 (e.g., at high ac input

voltages) and low battery voltages.

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