AAT2601 Power Management Chip for GSM and CDMA Cellphones - AnalogicTech

AnalogicTech introduced the AAT2601 power management chip designed for
CDMA and GSM cellphones. The power management chip integrates all
the power requirements of next-gen CDMA handsets, including: a
single-cell Lithium-ion battery charger, five low dropout (LDO)
regulators, a 300 mA step-down converter, an I2C interface and a reset function. AAT2601
power management chip also includes 2 load switches for dynamic power path/sleep
mode operation, applicable for CDMA or GSM cellphones.

AnalogicTech’s AAT2601 Power Management Chip

Applications of AAT2601 power management chip includes:

• GSM or CDMA Cellphones
• Digital Cameras
• Personal Digital Assistants (PDAs)
• Handheld Computers
• Handheld Instruments
• Portable Media Players

The AAT2601’s battery charger is a dynamic device that has capability in
providing power to the system while charging the battery. This regulated
(thermally) constant current/constant voltage linear charger combines a pass
device, high accuracy current and voltage regulation, reverse blocking
protection, charge status and charge termination functions. To optimize the
system performance, designer can adjust the charging current, recharge voltage
and charge termination current parameters through I2C 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 I2C interface.

To power noise-sensitive circuits, the AAT2601’s five LDOs offer 60 dB Power
Supply Rejection Ration (PSRR) and low noise operation. One of the LDOs outputs
300 mA for digital circuit applications. Other four LDOs output 150 mA each.

AAT2601 Power Management Chip - Block Diagram

Features of AAT2601 power management chip:

• Voltage Regulator VIN Range: 4.5V to 6V
• Complete Power Integration
  • Integrated Load Switches to Power Converters from
  • AC Adapter or Battery Automatically
• Low Standby Current
  • 170µA (typ) w/ Buck (Core), LDO1 (PowerDigital),and LDO2 (PowerAnalog)
    Active, No Load
• Five LDOs Programmable with I2C
  • LDO1: 3.0V, 300mA (PowerDigital)
  • LDO2: 3.0V, 150mA (PowerAnalog or PLL)
  • LDO3: 3.0V, 150mA (TCXO)
  • LDO4: 3.0V, 150mA (TX)
  • LDO5: 3.0V, 150mA (RX)
• One Step-Down Buck Converter (Core)
  • 1.8V, 300mA Output
  • 1.5MHz Switching Frequency
  • Fast Turn-On Time (120µs typ)
• Noise: 50µVrms for LDO3, LDO4, and LDO5
• PSRR: 60dB@10kHz
• 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)
• Separate Enable Pins for Supply Outputs
• Adapter OK (ADPP) and Reset (RESET) Timer Outputs
• Over-Current Protection
• Over-Temperature Protection

The AAT2601 is a member of company’s Total Power Management ICTM (TPMICTM)
product family

The AAT2601 power management chip is available in a 36-pin, 0.8-mm high TQFN
package with price: US$ 1.81 (1000 unit qty).

More info: AnalogicTech