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© demarco dreamstime.com Components | July 03, 2013

Synchronous buck regulator IC

The new A8650 from Allegro MicroSystems Europe is a robust synchronous buck regulator IC designed for automotive power-supply applications in areas such as instrument clusters, HVAC, navigation, and audio systems.
The new AEC Q100 qualified device is an adjustable-frequency, high output current, PWM regulator that integrates a high-side P-channel MOSFET and a low-side N-channel MOSFET. It incorporates current-mode control to provide simple compensation, excellent loop stability, and fast transient response.

Key features of the A8650 include a switching frequency that is externally adjustable from 250 kHz to 2.4 MHz, an externally set soft-start time to minimise inrush currents, an enable/synchronisation input to either turn the output voltage on or off and/or synchronise the PWM switching frequency, and a “power OK” output to indicate when the output voltage is within its regulated limits. The sleep mode current of the A8650’s control circuitry is less than 3 µA.

Protection features include input undervoltage lockout, cycle-by-cycle overcurrent protection, “hiccup” mode short-circuit protection, overvoltage protection, and thermal shutdown. In addition, the A8650 provides open-circuit, adjacent pin short-circuit, and short-to-ground protection at every pin to satisfy the most demanding automotive applications.

The A8650 uses external compensation to accommodate a wide range of power components to optimise transient response without sacrificing stability. It regulates input voltages from 2.5 V to 5.5 V down to output voltages as low as 0.8 V, and is able to supply at least 2 A of load current.

The A8650 is available in a 10-pin eMSOP package (suffix LY) with exposed pad for enhanced thermal dissipation.

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