A8591: Wide Input Voltage, 2 A Buck Regulator Family with Low-IQ Mode

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Packaging

The A8591 is designed to provide the power supply requirements of next generation car audio and infotainment systems. The A8591 provides all the control and protection circuitry to produce a high-current regulator with ±1% output voltage accuracy.

The A8591 employs current-mode control to provide simple compensation, excellent stability, and fast transient response. The A8591 employs pulse-frequency modulation (PFM) to draw less than 33 μA from 12 VIN while supplying 5 V/40 μA (A8591, 5 VOUT), or less than 24 μA from 12 VIN while supplying 3.3 V/40 μA (A8591-1, 3.3 VOUT). When operational, the A8591 operates down to at least 3.6 VIN (VIN falling). The Sleep feature allows for very low standby current.

Features of the A8591 include a programmable PWM switching frequency. The regulator switching frequency can be synchronized to an external clock. The A8591 has external compensation to optimize stability and transient response for a wide range of external components and applications. The A8591 has a fixed soft-start time of 5 ms.

Extensive protection features of the A8591 include pulse-by-pulse current limit, hiccup mode short-circuit protection, open/short asynchronous diode protection, BOOT open/short voltage protection, VIN undervoltage lockout, and thermal shutdown.

The A8591 is supplied in a 10-pin wettable flank DFN package (suffix EJ) with exposed power pad. It is lead (Pb) free, with 100% matte-tin leadframe plating.

  • Automotive AEC-Q100 qualified
  • Withstands surge input to 40 VIN for load dump
  • Operates down to 3.4 VIN (typ), 3.6 VIN (max) for idle stop
  • Utilizes pulse-frequency modulation (PFM) for low-IQ mode
  • 10 μA Sleep mode (automatic PWM / Low-IQ PFM mode selection)
  • Fixed output voltage options: 3.3 or 5 V with ±1% accuracy
  • Delivers up to 2 A of output current
  • Integrated 110 mΩ high-side MOSFET
  • Adjustable switching frequency from 300 kHz to 2.4 MHz
  • EMI reduction features:
    • Frequency dithering
    • Controlled switching node
  • External synchronization capability
  • Maximum duty cycle for low dropout
  • Active low NPOR output with 7.5 ms delay
  • Pre-bias startup capable: VOUT increases monotonically, will not cause a reset
  • External compensation for maximum flexibility
  • Stable with ceramic or electrolytic output capacitors
  • Internally fixed soft-start time of 5 ms
  • Pulse-by-pulse current limit, hiccup mode short-circuit, and thermal protections
  • Pin open/short and component fault tolerant
  • –40°C to 150°C operating junction temperature range
  • Thermally enhanced DFN-10 surface-mount package

Typical Applications

Automotive:

10-contact DFN  EJ Package

The A8591 is supplied in a 10-pin wettable flank DFN package (suffix EJ) with exposed power pad. It is lead (Pb) free, with 100% matte-tin leadframe plating.

EJ Package Documentation

Part Number Specifications and Availability