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Automotive Multioutput Voltage Regulator
A8450
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Functional Block Diagram
Internal
Reference
Adjustable
Delay
VREG11
VBB
LX
Soft Start
V5D
VREG
C8
C7
D1
L1
COUT
C1
ENB
VIN
CLADJ
VADJBD
FB
Q2
C4
VREG
CL33
V33BD
V33
Q1
C3
R3
R4
VADJ
R1
R2
V5A
C2
Short-to-Supply
Protection
5V Analog
Linear Regulator
and V5D to V5A
Tracking Control
5 V Digital Linear
Regulator
Current
Limiting
1.2 V to 3.3 V
Adjustable Linear
Regulator Control
3.3 V Linear
Regulator Control
CIN
D2
Buck Converter with
Switching Regulator
High
Voltage
Switch
CP2
CP1
VCP
Charge Pump
C10
ENBAT
High V
Protection
VREG
VBB
V
REF
V
UVLOREG
V
UVLOADJ
V
UVLO33
NPOR
C9
CPOR
NFAULT
POR Block
Fault
V5A Short to Supply
UVLO V5D, V5A
TSD Warning
GND
CPOK
ID
Characteristics
Representative Device
C1, C2, C3, C4
1 糉, 25 V ceramic X7R
COUT
100 糉, 35 V low-ESR electrolytic
UHC1V101M, Nichicon
CIN
47 糉, 63 V electrolytic
C7, C8
0.1 糉, 50 V ceramic X7R (for 14 V applications), or
0.1 糉, 100 V ceramic X7R (for 42 V applications)
C10
0.22 糉, 10 V X7R
D1, D2
1 A, 40 V Schottky (for 14 V applications)
EKO4, Sanken
L1
100 糎, 1.2 A
D03316HT, Coilcraft
Q1, Q2 pass transistors    npn transistor, h
FE
 > 50
MPSW06
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