4.0V<V

<6.0V

CC

Charge

Initialization

BatteryVoltage(VoltageatBAT pin

checkedcontinuously.)

Sleep

Mode

V

<V

BAT

SLP

V

<

MCV

V

<V

BAT

SLP

Charge

Qualification

State

V

<V

BAT

MCV

Battery Temperature

(Temperatureat TSpinchecked

continuously.Sampledevery8seconds

for

T/ t.)

D D

V

Reset

or

BatteryReplacementatanytime

CC

Charge

Suspended

V

>V

TS

HTF

V

<V

TS

HTF

Battery

Conditioning

Current

Regulation

V

<V

BAT

LBAT or

V

>V

TS

LTF

V

<V

TS

HTF

V

>V

TS

LTF

V

V

V

<V

LBAT

BAT

HTF

TS

LTF

<

and

<V

V

<V

<V

and

V

<V

<V

LBAT

BAT

MCV

HTF

TS

LTF

D D

T/ t(afterhold-offperiod),

orV

<V

or

Time=MTO

TS

TCO

Voltage

Regulation

V

>V

TS

LTF

Top-Off

Selected?

Trickle

Maintenance

Charge

NO

YES

Top-Off

V

>V

TS

LTF

V

<V

TS

LTF and

Time<MTO

Time=MTO

Done

V

V

BAT

MCV

≥

V

V

BAT

MCV

≥

Charge

Suspended

(SeeNote)

V

<V

TS

HTF

V

>V

TS

HTF

and Time<MTO

V

<V

TS

HTF

V

>V

TS

HTF

V

ResetorBatteryReplacementorCapacityDepletion(Li-lon)

CC

Current Taper(I

<I

).

or

Time=2xMTOorV

<V

BAT

min

TS

TCO

Time<MTO

and

V

V

BAT

MCV

reaches

Fast Charge State

V

<

SLP

V

<V

BAT

CC

bq2000T

SLUS149D – MAY 1999 – REVISED JANUARY 2010

www.ti.com

NOTE: If VTS < VTCO at any time, may only return to Trickle Maintenance Charge state and not to Top-Off.

Figure 2. State Diagram

4

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