A8450
Automotive Multioutput Voltage Regulator
ELECTRICAL CHARACTERISTICS (continued)
at T
A
= –40ºC to 135°C, V
BB
= 6 to 45 V, V
ENB
= 5 V, unless
otherwise noted
Characteristics
Protection
Symbol
V
ERRON
I
ERROFF
t
POR
V
UVLOV33
V
HYSV33
V
UVLOV5
V
HYSV5
V
UVLOVADJ
V
FB
rising
V
FB
falling
At FB pin
V
REG
rising
V
REG
falling
Test Conditions
Fault asserted;
I
NFAULT
, I
NPOR
= 1 mA
V
NFAULT
, V
NPOR
= 5 V
C9 = 0.47 µF
V
33
rising
V
33
falling
Min.
–
–
65
2.80
2.75
–
4.36
4.24
–
1.02
0.97
–
175
4.94
–
–
–
Typ.
–
–
100
2.95
2.90
80
4.50
4.38
125
1.07
1.02
70
200
5.15
160
175
15
Max.
400
1
135
3.10
3.05
–
4.75
4.63
–
1.12
1.07
–
225
5.36
–
–
–
Units
mV
µA
ms
V
V
mV
V
V
mV
V
V
mV
mV
V
°C
°C
°C
NFAULT, NPOR Output Voltage
NFAULT, NPOR Leakage Current
POR Delay
V33 Undervoltage Threshold
V33 Hysteresis
V5A, V5D Undervoltage Threshold
V5A, V5D Hysteresis
VADJ Undervoltage Threshold
VADJ Hysteresis
V
HYSVADJ
VADJ, V33 Overcurrent Threshold
V
OC
VREG Undervoltage Threshold
V
UVLOVREG
Thermal Warning Threshold
T
JTW
T
J
rising
Thermal Shutdown Threshold
T
JTSD
T
J
rising
Thermal Shutdown Hysteresis
T
HYSTSD
Recovery period = T
JTSD
– T
JTW
*
Linear regulator output specifications are only valid when V
REG
is in regulation (V
BB
≥
6.5).
Power Dissipation Versus Ambient Temperature
4.5
4.0
Power Dissipation, P
D
(W)
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
4-Layer PCB*
(R
θJA
= 35 ºC/W)
60
80
100
120
140
160
Ambient Temperature (°C)
*In still air; mounted on PCB based on JEDEC high-conductance standard PCB
(JESD51-7; High Effective Thermal Conductivity Test Board for Leaded Surface Mount
Packages); data on other PCB types is provided on the Allegro Web site.
20
40
A8450KLB-DS, Rev. 1
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
4
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
