A4492: Triple Output Step-Down Switching Regulator


Designed to provide the power supply requirements for a wide range of applications, the A4492 provides three high current, high performance, switching regulator outputs with independent soft start.

High frequency switching allows selection of inexpensive inductors and small ceramic output capacitors. The turn-on cycles of the regulators are interleaved to minimize stresses on the input capacitors and to reduce EMI. A charge pump is used to provide the supply for driving the power switches, ensuring operation at very wide operating duty cycles and avoiding the need for power-draining clamp circuits.

A power-on-reset circuit with user configurable delay indicates when enabled regulators are in specification. The power-onreset flag also indicates when the input voltage drops below specification, giving the system controller advance warning while the switchers continue to operate down to the shutdown level.

Internal diagnostics provide comprehensive protection against overloads, input undervoltages, and overtemperatures.

The A4492 is provided in a 20-contact, 4 mm × 4 mm, 0.75 mm nominal overall height QFN, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.

DISCONTINUED: This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: December 28, 2019.

Recommended Substitutions: A4490.

Top Features

  • Three buck converters
  • 4.5 to 34 V input voltage range
  • 550 kHz fixed frequency
  • Multiphase switching
  • Independent control of each converter
  • Power-on-reset flag
  • Internal compensation
  • 4 × 4 mm QFN Package, small PCB footprint
  • RoHS compliant

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A4492EESTR-T 20-lead QFN -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Distributor Stock
APEK4492EES-01-T DEMO BOARD -40°C to 85°C No -- Discontinued Contact your
local sales rep
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.