Quad-output power management solution for automotive infotainment
The A8600 includes control circuitry to implement three adjustable, asynchronous buck regulators with integrated MOSFETs. It also provides the control circuitry, gate drivers, and current sensing to implement a synchronous buck regulator with external MOSFETs.
Of the three asynchronous regulators, one is an “always on” type of buck regulator that operates down to at least 3.6 V input voltage (with the voltage falling). In standby mode, the “always on” regulator draws less than 50 µA from 12 V while employing pulse frequency modulation (PFM) to deliver 3.3 V at 40 µA via the regulator.
Features of the A8600 include an enable/synchronisation input to either turn the A8600 on and off or increase or decrease the base PWM frequency, four adjustable soft-start times and four external compensation pins. Output voltage monitoring of the three switching regulators is provided by a single, open-drain, “power OK” output.
In addition, the A8600 also incorporates two high-voltage high-side switches with foldback overcurrent protection for passing a voltage while passing a current of up to 450 mA and limiting the current to 100 mA during foldback. The two high-side switches actively block reverse current.
The A8600 also features direct battery and switched accessory battery detectors and a mute pulse output with an adjustable delay. Additional protection capabilities include pulse-by-pulse current limit, “hiccup” mode short-circuit protection, asynchronous diode protection, “boot” voltage protection, undervoltage lockout, overvoltage protection and thermal shutdown.
The A8600KLPTR-T device is available in a 48-pin LQFP package with exposed pad (suffix JP) for enhanced thermal performance.
For more information visit www.allegromicro.com
