AAT3601_08 Datasheet, PDF (1/37 Pages) Advanced Analogic Technologies – Total Power Solution for Portable Applications

PRODUCT DATASHEET
AAT3601178
Total Power Solution for Portable Applications
General Description
The AAT3601 is a member of AnalogicTech’s 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 portable short-range communications
enabled mobile devices and 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 and the charge termination current as well as
recharge voltage are programmable with either an exter-
nal resistor and/or by a standard I²C interface.
The step-down DC/DC converter is integrated with inter-
nal compensation and operates at a switching frequency
of 1.5MHz, thus minimizing the size of external compo-
nents while keeping switching losses low and efficiency
greater than 95%. All LDO output voltages are program-
mable using the I²C interface.
The five LDOs offer 60dB power supply rejection ratio
(PSRR) and low noise operation making them suitable for
powering noise-sensitive loads. The LDOs and DC/DC
converter are separated into Permanent-Enabled (PE)
and Non-Permanent (NP) enabled supplies.
All six voltage regulators operate with low quiescent cur-
rent. The total no load current when the 3 PE LDOs are
enabled is only 200μA.
The device includes a watchdog timer input and two
reset outputs for the watchdog and LDO regulation. The
device also can be programmed through a standard I²C
interface.
The AAT3601 is available in a thermally enhanced low
profile 5x5x0.8mm 36-pin TQFN package.
Features
• Voltage Regulator V_IN Range: 4.5V to 6V
• Complete Power Integration
▪ Integrated Load Switches to Power Converters from
AC Adapter or Battery Automatically
• Low Standby Current
▪ 200μA (typ) w/LDO1, LDO2 and LDO5 Active,
No Load
• One Step-Down Buck Converter (NP)
▪ 1.24V, 300mA Output
▪ 1.5MHz Switching Frequency
▪ ^{Fast Turn-On Time (120μs typ)}
• Five LDOs Programmable by I²_C
▪ ^{LDO1: 3.4V, 150mA (PE)}
▪ LDO2: 3.4V, 300mA (NP)
▪ LDO3: 1.24V, 300mA (PE)
▪ LDO4: 1.85V, 300mA (NP)
▪ LDO5: 1.85V, 300mA (PE)
▪ PSRR: 60dB @10kHz
▪ Noise: 50μVrms
• One Battery Charger
▪ Digitized Thermal Regulation
▪ Charge Current Programming up to 1.4A
▪ Charge Current Termination Programming
▪ Automatic Trickle Charge for Battery Preconditioning
(2.8V Cutoff)
• Watchdog (WDI) Timer Input
▪ Two Reset (RSTIN, RSTLPW) Timer Outputs
• Separate Enable Pins for PE and NP Supplies
• Digital Programming of Major Parameters via I²_C
• Over-Current Protection
• Over-Temperature Protection
• 5x5mm TQFN55-36 Package
Applications
• Digital Cameras
• GSM or CDMA Cellular Phones
• Handheld Instruments
• PDAs and Handheld Computers
• Portable Media Players
• Short-Range Communication Headsets
3601.2008.07.1.1
www.analogictech.com
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