Wide Input Voltage, 2.4 MHz, 3.0 A Asynchronous Buck Regulator With Low-IQ Standby, Sleep Mode, External Synchronization, and NPOR Output


Product Image


Top Features


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.

  • Automotive AEC-Q100 qualified
  • Withstands surge voltages up to 40 V
  • Operates as low as 3.4 VIN (typ) with VIN decreasing
  • Utilizes pulse frequency modulation (PFM) to draw only tens of microamperes from VIN while maintaining keep-alive VOUT
  • PWM/PFM mode control input pin
  • Delivers up to 3.0 A of output current with integrated 110 mΩ high voltage MOSFET
  • SLEEP input pin commands ultra-low current shutdown mode
  • Adjustable output voltage with ±1.0% accuracy from 0°C to 85°C, ±1.5% from –0°C to 150°C
  • Programmable switching frequency: 250 kHz to 2.4 MHz
  • Synchronization capability: applying a clock input to the PWM/PFM input pin will increase the PWM frequency
  • Active low, power-on reset (NPOR) open-drain output
  • Maximized duty cycle for low dropout
    • Enhanced recovery Idle-Stop Transients
  • Pre-bias startup capable, VOUT will not cause a reset
  • External compensation for maximum flexibility
  • Stable with ceramic or electrolytic output capacitors
  • Excellent set of protection features to satisfy the most demanding applications
  • Overvoltage, pulse-by-pulse current limit, hiccup mode short circuit, and thermal protection
  • Robust FMEA, with pin open/short and component faults
  • Thermally enhanced, surface mount package

Typical Applications

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.

LP Package Documentation

Part Number Specifications and Availability