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Multiple-output regulator aimed at automotive LCDs

Posted: 30 Jan 2015     Print Version  Bookmark and Share

Keywords:Allegro MicroSystems  regulator  LCD  MCU 

Allegro MicroSystems LLC has introduced an AEC-Q100 qualified, multiple-output regulator geared to power car LCD panels. The A8603 operates with fixed switching frequency that can be either programmed or synchronised with an external clock signal between 350kHz and 2.25MHz which will reduce interference with AM and FM radio bands, according to the company.

An I2C-compliant serial interface allows a system MCU to configure the A8603 by writing into its internal registers. A system controller can also access A8603's status registers in case of fault conditions.


The A8603 incorporates a boost stage followed by two linear regulators and two charge-pump regulators. Each output voltage can be programmed independently through the I2C serial interface. During power-up and shutdown, the outputs are turned on and off in pre-programmed sequences with adjustable delay. This allows the user to meet the sequencing requirements for specific LCD panels. Short circuit protection is provided for all outputs. The internal boost switch is protected against overcurrent and overvoltage.

The A8603 is available in a 24-pin, 4mm x 4mm QFN package. It has an exposed thermal pad to allow operation at high ambient temperatures and is lead-free with 100 per cent matte-tin lead frame plating.

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