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Micro PMIC supports Li-Ion powered devices

Posted: 11 May 2011 ?? ?Print Version ?Bookmark and Share

Keywords:single-cell Li-Ion? power management integrated circuit? portable devices?

austriamicrosystems introduces the AS3605, a power management integrated circuit (PMIC) designed specifically for portable devices powered by a single-cell Li-Ion battery. The device integrates seven low dropout regulators (LDOs), a DC/DC converter, a complete battery charger, LED backlight driver and an audio power amplifier on one die.

The features and performance of the cost-efficient AS3605 Micro PMIC allow it to be used in many portable devices powered by one Li-Ion battery such as high-end blood glucose meters, high-end remote controls, GPS equipment, mobile meters, e-dictionaries and entry-level mobile phones. It can be used for any entry-level mobile phone handset standard, including CDMA, WCDMA, GSM, GPRS, EDGE, UTMS and other American and Japanese standards.

The seven programmable LDOs feature low noisetypically 30?V RMS from 100HzC100kHzas well as line/load regulation of


Processor and memory power supplies must follow precise startup sequences to prevent serious damage. Therefore it is critical that the voltages are switched on and off in the correct order. Compared to a discrete solution consisting of a collection of standalone DC/DC converters, LDOs and chargers, the task is greatly simplified with the AS3605. With its software-programmable startup sequences, the AS3605 brings new flexibility to the market for Micro PMICs. Other competitors offer PMICs with fixed startup sequences that must be selected with external resistors.

The AS3605's output voltage and the timing of all regulators are programmed via software. With the software and demo board, the AS3605's OTP memory can be easily programmed, enabling fast prototype runs for quick market introduction. The slope of the ramp can be set for the step-down converters. The user can program the startup sequence with timing steps of 1ms or 4ms. In order to control other parts of the system, the general purpose I/O pins can be programmed to a specific timing.

The AS3605 is controlled via a serial interface and integrates all necessary system specific functions such as Reset, Watchdog, and Power-On Detection. Output voltages and startup timings can be programmed via the internal OTP memory.

Housed in a 40-pin 5x5mm QFN package, the AS3605 Micro Power Management Unit is specified for operation from a battery supply range of 3.0C5.5V over an ambient temperature range of -40C85C.

The AS3605 Micro PMIC is available now.

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