AAT3687(2006) 查看數據表（PDF） - Analog Technology Inc

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AAT3687
(Rev.:2006)

Lithium-Ion/Polymer Battery Charger

Analog Technology Inc 

System Operation Flow Chart

AAT3687

Lithium-Ion/Polymer Battery Charger

Output

ADPP

Yes

ADP

Voltage

ADP > VADPP

No

Yes

Yes

UVLO

VP > VUVLO

No

Switch

No

Sleep

Mode

Power On

Reset

ADP

Loop

Enable

Thermal

Loop

Fault

Yes

Conditions Monitor

OV, OT

No

Timing

Shut Down

Expire

No

Recharge Test

VRCH > VBAT

Yes

Battery

No

Temperature Monitor

Battery

VTS1 < TS < VTS2

Temperature

No

Device

Temperature

Monitor

TJ > 110°C

Yes

Thermal Loop

Current

Reduction

Yes (AAT3687)

Charge

Safety Timer

Yes

Preconditioning Test

Low Current

Set

VMIN > VBAT

Conditioning

No

Yes

Current Phase Test

VCH > VBAT

Current

Charging

Mode

No

Yes

Voltage Phase Test

IBAT > IMIN

No

Charge

Completed

Voltage

Charging

Mode

Application Information

Adapter Power Input

Constant current charge levels up to 1.5A may be

programmed by the user when powered from a suf-

ficient input power source. The AAT3687 will oper-

ate from the adapter input over a 4.0V to 5.5V

range.

The constant current fast charge current for the

adapter input is set by the RSET resistor connected

between the ADPSET and ground. Refer to Table 1

for recommended RSET values for a desired con-

stant current charge level. The presence of voltage

on the adapter input is indicated by the ADPP# pin

function. This indicator pin uses an internal open

drain device that will pull the ADPP# pin low when

3687.2006.06.1.5

11

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