A8450 Datasheet, PDF (1/17 Pages) Allegro MicroSystems – Automotive Multioutput Voltage Regulator

A8450
Automotive Multioutput Voltage Regulator
Features and Benefits
▪ 6 V to 45 V input range
▪ DC-to-DC buck converter with 5.7 V output
▪ Overcurrent protection with foldback, and undervoltage
lockout (UVLO)
▪ Dual 5 V outputs
▫ Digital 5 V ±2%, 200 mA
▫ Analog 5 V, 200 mA
▫ Short-to-supply protection on analog regulator
▫ Analog to digital regulator output tracking < 0.5%
throughout operating temperature range
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Package: 24 pin SOIC (suffix LB)
Description
The A8450 is a multioutput power supply intended for
automotive applications. The A8450 operates from a wide
input supply range and is designed to satisfy the requirements
of high ambient temperature environments.
Four regulated voltage outputs provide multiple options. The
3.3 V regulator and the 1.2 to 3.3 V adjustable regulator can be
used to power microcontroller or DSP cores, or for I/O, sensing,
and A-to-D conversion. Two 5 V outputs, one digital and the
other analog, feature output tracking within 0.5% of each other
over the operating temperature range. In addition, the analog
regulator is protected against short-to-battery conditions. All
four regulators feature foldback current limit protection.
The device can be enabled or disabled using two input pins.
The high voltage input, on the ENBAT pin, allows enable/
disable using an engine ignition or battery switch signal. The
logic-level input, on the ENB pin, allows enable/disable by
microcontroller or DSP signals.
When disabled, the A8450 draws less than 10 μA of current.
A POR (power-on-reset) block monitors the supply voltages
and provides a reset signal, with an adjustable delay, for
Not to scale
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Typical Application
VIN D2
CIN
C8
C7
C10
C9
R4
Q2
VADJ
R1
R2
C4
H.V.
VBB
LX
CP2
ENBAT
CP1
V33
VCP
V33BD
VREG11
CL33
GND _A8450 GND
GND
GND
ENB
VREG
CPOR
V5D
CLADJ
NFAULT
VADJBD
NPOR
FB
V5A
L1
D1
COUT
Q1
C3
R3
C1
C2
A8450-DS, Rev. 8