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Automotive Multioutput Voltage Regulator
A8450
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Selection Guide
Absolute Maximum Ratings
Part Number
Pb-free
Packing
Terminals
Package
A8450KLBTR-T
Yes
1000 pieces per 13-in. reel
24
SOIC-W surface mount, internally
fused power ground pins (6-7, 18-19)
Parameter
Symbol
Conditions
Rating
Units
Load Supply Voltage
V
BB
VBB pin
 40
V
Analog Output
V
5A
V5A pin
1 to 45
V
Logic Input Signal
V
ENBAT
ENBAT pin input
0.3 to 45
V
V
ENB
ENB pin input
0.3 to 6.5
V
LX Voltage
V
LX
LX pin
2 to V
BB
V
Operating Temperature Range
T
A
K range
40 to 135
癈
Junction Temperature
T
J
(max
)
150
癈
Storage Temperature Range
T
stg
55 to 150
癈
Description (continued)
microcontroller or DSP resets. A separate fault pin signals TSD
(thermal shutdown), 5 V analog short-to-supply, and 5 V analog or
digital undervoltage.
The A8450 is supplied in a 24-pin SOIC-W package (part number
suffix LB) with internally-fused power ground pins for enhanced
thermal performance. This provides an R
窲A
 of 35癈/W on a 4-layer
board (see chart on p. 5). The lead (Pb) free version has 100% matte
tin leadframe plating.
? 3.3 V linear regulator, with foldback current limit
? Adjustable 1.2 V to 3.3 V linear regulator, adjustable foldback
current limit
? Ignition switch enable; Sleep mode
? 100% duty cycle operation for low input voltages
? Power OK output
? 40癈 to 135癈 ambient operating temperature range
Features and Benefits (continued)
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