TPS65721 datasheet(19/50 Pages) TI

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USB100

USB 500

V REF -

ILIM

USB- susp

ShortDetect

V IPRECHG

V ICHG

ShortDetect

IBAT(SC

)

T J(REG)

T J

V DPPM

VSYS

V BAT(REG

)

V BAT(SC)

V O(REG)

V O(SC1

)

OUT -SC1

BAT -SC

V REF- ITERM

V LOWV

V RCH

INTC

V HOT

V COL

tDGL(NO -

IN )

tDGL(PGOOD

)

tBLK(OVP )

V BAT +V AC -DT

V UVLO

V OVP

V AC

Dynamical

Controlled

Oscillator

V IPRECHG

V ICHG

V ISET

~100mV

Fast - Charge

Timer

Pre -Charge

Timer

Halt

timers

Timer

fault

EN2

SYS

BAT

ISET

ChargeControl

IBAT (DET)

V IN -LOW

V BAT

OUT-SC2

Reset

timers

tDGL(TS)

Timers

disabled

IBIAS -

ITERM

V OUT

Supplement

ITERM -

floating

tDGL(SC2)

250mV

40mV

V DIS(TS)

~3V

<I_TERM0>

<I_TERM1>

<IN_CUR_LIM>

<USB_SUSP>

<CH_VLT0>

<CH_VLT1>

< I_PR_CH0>

< I_PR_CH1>

<V_ DPM>

<TERM_DIS>

<USB_SUSP>

<CH_EN>

<DYN_TMR>

<TH_LOOP>

<SFTY_TMR_0>

<SFTY_TMR1>

<PR_ CH_TMR>

<TMR_F>

<VOUT_0>

<VOUT_1>

<TS_ON>

<TS_HOT>

<TS_COLD>

<E_I_TS>

<CH_DONE>

<PGOOD>

T3L : TD

T3L:/GHG

T3L:/PGOOD

T3L:ITERM

T3L:/CE

I_CH_SCL0

I_CH_SCL1

TPS65720

TPS65721

www.ti.com

SLVS979 – OCTOBER 2009

Figure 23. Charger Block Diagram

BATTERY CHARGING

When <CH_EN>=1, battery charging begins. First, the device checks for a short circuit on the BAT pin by

sourcing IBAT(SC) to the battery and monitoring the voltage. When the BAT voltage exceeds VBAT(SC), the battery

charging continues. The battery is charged in three phases: conditioning precharge, constant-current fast charge

(current regulation) and a constant-voltage tapering (voltage regulation). In all charge phases, an internal control

loop monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is

exceeded.

Figure 24 shows what happens in each of the three phases:

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