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

A8585

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A8585 ECAD Model
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Description

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Packaging

The A8585 family is designed to provide the power supply requirements of next generation car audio and infotainment systems. The A8585 family provides all the control and protection circuitry to produce a high current regulator with ±1% output voltage accuracy.

In PWM mode, the A8585 family employs current mode control to provide simple compensation, excellent stability, and fast transient response. In Low IQ mode, the A8585 family employs pulse frequency modulation (PFM) to draw less than 33 μA from 12 VIN while supplying 5 V/40 μA.

When operational, the A8585 family operates down to at least 3.6 VIN (VIN falling). The selectable Sleep mode feature allows for very low standby current.

Features of the A8585 family include a programmable PWM switching frequency. The regulator switching frequency can be synchronized to an external clock. The A8585 has external compensation to optimize stability and transient response for a wide range of external components and applications. The A8585 has a fixed soft start time of 5 ms.

Extensive protection features of the A8585 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 A8585 is supplied in a 10-pin SOIC package (suffix LK) 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
  • Function options:
    • Selectable PWM / Low IQ PFM mode, or
    • Selectable 10 μA Sleep mode (automatic PWM / Low IQ PFM mode selection)
  • Fixed output voltage options: 3.3 V or 5 V with ±1.0% accuracy
  • Delivers up to 2 A of output current
  • Integrated 110 mΩ high-side MOSFET
  • Adjustable switching frequency from 300 to 550 kHz (to 605 kHz with sync)
  • EMI Reduction Features:
    • Frequency dithering
    • Controlled switching node
  • External synchronization capability
  • 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 SOIC-10 surface mount package

Typical Applications

The A8585 is supplied in a 10-pin SOIC package (suffix LK) with exposed power pad. It is lead (Pb) free, with 100% matte-tin leadframe plating.

LK Package Documentation

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Part Number Specifications and Availability