A4492 Datasheet, PDF (1/16 Pages) Allegro MicroSystems – Designed to provide the power supply requirements for automotive applications, the A4492 provides three high current, high performance, switching regulator outputs with independent soft start.

A4492
Triple Output Step-Down Switching Regulator
for Automotive Applications
Features and Benefits
▪ 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
Package: 20-contact QFN (suffix ES)
Approximate size
Description
Designed to provide the power supply requirements for
automotive 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.
Apower-on-reset circuit with user configurable delay indicates
when enabled regulators are in specification. The power-on-
reset 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.
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4492-DS
V_BB
Microcontroller or
Controller Logic
Typical Application
VDD CP1 CP2
PORZ
CPOR
VCP _VBB1
LX1
ENB1
ENB2
ENB3
A4492
FB1
VBB2
LX2
PGND
FB2
VBB3
LX3
GND
FB3
V_REG1
V_REG2
V_REG3