AnalogicTech Introduces Power Management ICs To Simplify CDMA Phone Designs
Advanced Analogic Technologies Inc. (AnalogicTech) announced the AAT2601, the company’s first power management IC designed for the specific requirements of mid-tier CDMA handsets. Integrating a single-cell Lithium-ion battery charger, a 300mA step-down converter, five low dropout (LDO) regulators, a reset function and an I²C interface, the latest addition to AnalogicTech’s Total Power Management IC product family is said to supply all the power requirements of next-generation CDMA handsets.
"As core currents rise in CDMA chipsets for mid range handset phones, it is essential that designers use more efficient power solutions with dynamic voltage adjustment to maximize system performance." says Siamak Bastami, Product Line Director for AnalogicTech. "By bringing together a battery charger, a low-noise 300 mA buck converter to power the baseband core, five LDOs for all critical digital, analog, transmit and receive functions, and an I2C interface to control voltages dynamically, the AAT2601 allows designers of CDMA handsets, including those targeted at the Chinese market, to optimize performance, reduce footprint and drive down cost."
The battery charger in the AAT2601 is a dynamic device capable of powering the system while charging the battery. This thermally regulated constant current/constant voltage linear charger combines a pass device, reverse blocking protection, high accuracy current and voltage regulation, charge status and charge termination functions. Charging current, charge termination current and recharge voltage are programmable via an external resistor or by a standard I²C interface. The company claims that, by using the I²C interface to program output voltages, designers can easily optimize system performance.
The 1.8V step-down converter delivers an output of 300mA. A 1.5 MHz switching frequency helps minimize the size of supporting external components while keeping switching losses low. Efficiency is greater than 95%. Turn-on time is a fast 120µs typical.
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. The other four output 150mA each. The AAT2601 also integrates two load switches to support dynamic power path/sleep mode operation. Total no-load current when the step-down converter and two LDOs are enabled is only 170µA. The chip also features both over-current and over-temperature protection.
The AAT2601 is qualified across the -40 to +85°C temperature range. It is available in a 36-pin, 0.8mm high TQFN package. The device sells for $1.81 in 1K quantities.
