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LX
ENBAT
V33
V33BD
CL33
GND
GND
VREG
V5D
NFAULT
NPOR
V5A
VBB
CP2
CP1
VCP
VREG11
GND
GND
ENB
CPOR
CLADJ
VADJBD
FB
VIN
H.V.
A8450
VADJ
CIN
D2
D1
L1
C8
C7
C10
C9
C4
C2
C3
COUT
C1
R1
R2
R3
Q2
Q1
R4
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 糀 of current.
A POR (power-on-reset) block monitors the supply voltages
and provides a reset signal, with an adjustable delay, for
A8450-DS, Rev. 8
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 ?%, 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
Automotive Multioutput Voltage Regulator
Continued on the next page&
Package: 24 pin SOIC (suffix LB)
Typical Application
Not to scale
A8450
Continued on the next page&
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