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Automotive Multioutput Voltage Regulator
A8450
15
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Terminal List Table
Name
Description
Number
VBB
Supply input
1
CP2
Charge pump capacitor, positive side
2
CP1
Charge pump capacitor, negative side
3
VCP
Charge pump output used to drive N-channel buck converter
transistor
4
VREG11
Internal reference
5
GND
Power ground
6
GND
Power ground
7
ENB
Logic control
8
CPOR
Connection for POR adjustment
9
CLADJ
Current limit for adjustable regulator
10
VADJBD
Base drive for adjustable regulator pass transistor
11
FB
Feedback for adjustable regulator
12
V5A
5 V analog regulator output
13
NPOR
Power on Reset logic output
14
NFAULT
Diagnostic output; open drain; low during fault condition
15
V5D
5 V digital regulator output
16
VREG
DC-to-DC converter supply output
17
GND
Power ground
18
GND
Power ground
19
CL33
Current limit for 3.3 V regulator
20
V33BD
Base drive for 3.3 V regulator pass transistor
21
V33
3.3 V regulator output
22
ENBAT
High voltage logic control
23
LX
Buck converter switching regulator output
24
Pin-Out Diagram
 3
 4
 5
 6
 7
 8
 2
 1
22
21
20
19
18
17
23
24
10
 9
11
15
14
13
16
12
VBB
CP2
CP1
VCP
VREG11
GND
GND
ENB
LX
ENBAT
V33
V33BD
CL33
GND
GND
VREG
CPOR
CLADJ
VADJBD
FB
V5D
NFAULT
NPOR
V5A
1.2 V to
3.3 V
Lin Reg
Control
5 V
Dig/Anlg
Lin Reg
5 V Reg
Track
Control
3.3 V
Lin Reg
Control
Charge
Pump
Buck
Converter
Soft
Start
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