Designed to provide the power supply requirements of next generation car audio and infotainment systems, the A8590 provides all the control and protection circuitry to produce a high current regulator with ±1.0% output voltage accuracy. The A8590 employs pulse frequency modulation (PFM) to draw less than 50 μA from 12 VIN while supplying 3.3 V/40 μA. After startup, the A8590 operates down to at least 3.6 VIN (VIN falling).
Features of the A8590 include a PWM/PFM mode control input to enable PWM (logic high) or PFM (logic low). If the PWM/PFM input is driven by an external clock signal higher than the base frequency (fOSC) the PWM frequency synchronizes to the incoming clock frequency. The SLEEP input pin commands an ultra-low current shutdown mode requiring less than 5 μA for internal circuitry and 10 μA (max) for MOSFET leakage at 16 VIN, 85ºC. The A8590 has external compensation to accommodate a wide range of frequencies and external components, and provides a power-on reset (NPOR) signal validated by the output voltage. The A8590 utilizes Enhanced Idle/Stop-Start Recovery technique to reduce or eliminate output overshoot when VIN recovers from levels below VIN minimum (i.e. VOUT drops out of regulation).
Extensive protection features of the A8590 include pulse-by-pulse current limit, hiccup mode short circuit protection, open/short asynchronous diode protection, BOOT open/short voltage protection, VIN undervoltage lockout, VOUT overvoltage protection and thermal shutdown.
The A8590 is supplied in a low profile 16-pin TSSOP package with exposed power pad (suffix LP). It is lead (Pb) free, with 100% matte-tin leadframe plating.
