AAT3680IKS-4.2-T1 View Datasheet(PDF) - Advanced Analog Technology, Inc.

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Description

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AAT3680IKS-4.2-T1

Lithium-Ion/Polymer Linear Battery Charge Controller

Advanced Analog Technology, Inc. 

Constant Voltage Charging

When the battery voltage reaches VCH during con-

stant current mode, the AAT3680 transitions to con-

stant voltage mode. The regulation voltage is fac-

tory programmed: 4.1V and 4.2V are available to

support different anode materials in lithium-ion/poly-

mer cells. In constant voltage operation, the

AAT3680 monitors the cell voltage and terminates

the charging cycle when the voltage across RSENSE

decreases to approximately 10mV.

AAT3680

Lithium-Ion/Polymer

Linear Battery Charge Controller

Charge Cycle Termination, Recharge

Sequence

After the charge cycle is complete, the AAT3680

latches off the pass device and automatically enters

power-saving sleep mode. Either of two possible

conditions will bring the IC out of sleep mode: the

battery voltage at the BAT pin drops below VRCH

(recharge threshold voltage) or the AAT3680 is reset

by cycling the input supply through the power-on

sequence. Falling below VRCH signals the IC that it

is time to initiate a new charge cycle.

PoPwoewr eOrnORneRseest et

UVLO

No

VP > VUVLO

ShSMuhMtouddtooeDdweonwn

Yes

TeTmeFpmaFeuparaleuttrlutarteure

No

Temperature Test

TS > VTS1

TS < VTS2

Yes

Preconditioning Test Yes

VMIN > VBAT

No

Current Phase Test

Yes

VCH > VBAT

< VRCH

No

Voltage

Phase Test

VTERM

RSENSE

< IBAT

Yes

No

ChCaLhragaLtecraghCtecOohCmfOfopmflfeptleete

Low Current

CoLnodwitiConuirnrgent

CCohnadrigtieoning

(TrickleChCahragrege)

Current

ChMCCaMhoruagdorrierdngeeginntg

CVhCoValhtoraagltgriangeggineg

MModoede

Figure 1: AAT3680 Operational Flow Chart.

6

3680.2006.03.1.6

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