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AAT2601 Datasheet

  • AAT2601

  • Total Power Solution for Portable Applications

  • 38頁

  • ANALOGICTECH

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PRODUCT DATASHEET
AAT2601178
Total Power Solution for Portable Applications
General Description
The AAT2601 is a member of AnalogicTech鈥檚 Total Power
Management IC
TM
(TPMIC
TM
) product family. It contains
a single-cell Lithium Ion/Polymer battery charger, a fully
integrated step-down converter and 5 low dropout (LDO)
regulators. The device also includes 2 load switches for
dynamic power path/sleep mode operation, making it
ideal for small handheld portable GSM or CDMA mobile
telephones.
The battery charger is a complete thermally regulated
constant current/constant voltage linear charger. It
includes an integrated pass device, reverse blocking pro-
tection, high accuracy current and voltage regulation,
charge status, and charge termination. The charging
current, charge termination current, and recharge volt-
age are programmable with an external resistor and/or
by a standard I
2
C interface.
The step-down DC/DC converter is integrated with internal
compensation and operates at a switching frequency of
1.5MHz, thus minimizing the size of external components
while keeping switching losses low and efficiency greater
than 95%. All LDO output voltages are programmable
using the I
2
C interface.
The five LDOs offer 60dB power supply rejection ratio
(PSRR) and low noise operation making them suitable for
powering noise-sensitive loads.
All six voltage regulators operate with low quiescent cur-
rent. The total no load current when the step-down con-
verter and 2 LDOs are enabled is only 170渭A.
The AAT2601 is available in a thermally enhanced low
profile 5x5x0.8mm 36-pin TQFN package.
Features
鈥?Voltage Regulator V
IN
Range: 4.5V to 6V
鈥?Complete Power Integration
鈻?/div>
Integrated Load Switches to Power Converters from
AC Adapter or Battery Automatically
鈥?Low Standby Current
鈻?/div>
170渭A (typ) w/ Buck (Core), LDO1 (PowerDigital),
and LDO2 (PowerAnalog) Active, No Load
鈥?One Step-Down Buck Converter (Core)
鈻?/div>
1.8V, 300mA Output
鈻?/div>
1.5MHz Switching Frequency
鈻?/div>
Fast Turn-On Time (120渭s typ)
鈥?Five LDOs Programmable with I
2
C
鈻?/div>
LDO1: 3.0V, 300mA (PowerDigital)
鈻?/div>
LDO2: 3.0V, 150mA (PowerAnalog or PLL)
鈻?/div>
LDO3: 3.0V, 150mA (TCXO)
鈻?/div>
LDO4: 3.0V, 150mA (TX)
鈻?/div>
LDO5: 3.0V, 150mA (RX)
鈻?/div>
PSRR: 60dB@10kHz
鈻?/div>
Noise: 50渭Vrms for LDO3, LDO4, and LDO5
鈥?One Battery Charger
鈻?/div>
Digitized Thermal Regulation
鈻?/div>
Charge Current Programming up to 1.4A
鈻?/div>
Charge Current Termination Programming
鈻?/div>
Automatic Trickle Charge for Battery Preconditioning
(2.8V Cutoff)
鈥?Adapter OK (ADPP) and Reset (RESET) Timer Outputs
鈥?Separate Enable Pins for Supply Outputs
鈥?Over-Current Protection
鈥?Over-Temperature Protection
鈥?5x5mm TQFN55-36 Package
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Digital Cameras
GSM or CDMA Cellular Phones
Handheld Instruments
PDAs and Handheld Computers
Portable Media Players
2601.2008.01.1.0
www.analogictech.com
1

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