AAT3603 Datasheet, PDF (19/35 Pages) Advanced Analogic Technologies – Total Power Solution for Portable Applications

Functional Block Diagram
CHGIN
PRODUCT DATASHEET
AAT3603178
Total Power Solution for Portable Applications
BAT
ENBAT
Charger
Control
Ref
ADPP
STAT
ISET
TS
CT
SDA
SCL
EN_TEST
EN_HOLD
EN_KEY
ON_KEY
EN2
EN3
EN4
EN5
AVIN2
I²C
and
Enable
Control
UVLO
VIN
BUCK
Ref
Enable
VIN
REF
RESET
PVIN
LX
OUTBUCK
PGND
CNOISE
AVIN1
AGND
Functional Description
The AAT3603 is a complete power management solution.
It seamlessly integrates an intelligent, stand-alone CC/
CV (Constant Current/Constant Voltage), linear-mode
single-cell battery charger with one step-down Buck con-
verter and five low-dropout (LDO) regulators to provide
power from either a wall adapter or a single-cell Lithium
Ion/Polymer battery.
If only the battery is available, then the voltage regula-
tors and converter are powered directly from the battery.
(The charger is put into sleep mode and draws less than
1μA quiescent current.)
Typical Power Up Sequence
The AAT3603 supports a variety of push-button or
enable/disable schemes. A typical startup and shutdown
process proceeds as follows (referring to Figures 1 and
2): System startup is initiated whenever one of the fol-
lowing conditions occurs:
1) A push-button is used to assert EN_KEY low.
2) A valid supply (>CHGIN UVLO) is connected to the
charger input CHGIN.
3) A hands free device or headset is connected, assert-
ing EN_TEST high.
3603.2008.06.1.0
www.analogictech.com
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