Automotive Multioutput Voltage Regulator
A8450
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS at T
A
= 40篊 to 135癈, V
BB
= 6 to 45 V, V
ENB
= 5 V, unless otherwise noted
Continued on next page
Characteristics
Symbol
Test Conditions
Min. Typ. Max. Units
Supply Quiescent Current
I
BB
Enabled mode: V
ENBAT
or V
ENB
= HIGH,
I
OUT
= 0 mA: V
BB
= 14 V
6
10
mA
Enabled mode: V
ENBAT
or V
ENB
= HIGH,
I
OUT
= 0 mA; V
BB
= 6 V
10
15
mA
Disabled mode: V
ENBAT
and V
ENB
= LOW
10
糀
Regulated Output Voltage
V
REG
I
LOAD
= 550 mA = I
LOADV5D
+ I
LOADV5A
+ I
LOADV33
+ I
LOADVADJ
; V
BB
> 6.5 V
5.50
5.80
V
Dropout: 6 V d V
BB
< 6.5 V
5.00
5.80
V
Buck Switch On-Resistance
R
DSON
T
J
= 25癈
415
500
m?/DIV>
T
J
= 135癈
650
750
m?/DIV>
Buck Switch Current Limit
I
DSLIM
1.0
1.2
2.2
A
DC-to-DC Fixed Off-Time
t
OFF
V
BB
= 14 V
4.75
約
Soft Start Time
t
SS
V
BB
= 14 V
5
10
15
ms
Logic Inputs
ENBAT Logic Input Voltage
V
ENBAT
HIGH input level
2.7
45
V
LOW input level
0.3
0.8
V
ENBAT Input Current
I
ENBAT
HIGH input level, V
ENBAT
= 45 V
300
糀
HIGH input level, V
ENBAT
= 14 V
70
糀
LOW input level, V
ENBAT
= 0.8 V
1
10
糀
ENB Logic Input Voltage
V
ENB
HIGH input level
2.7
6.5
V
LOW input level
0.3
0.8
V
ENB Input Current
I
ENB
HIGH input level, V
ENB
e 2.7 V
50
糀
LOW input level, V
ENB
d 0.8 V
1
10
糀
Linear Regulator Outputs
*
V5D Output Voltage
V
OUTV5D
1 mA d I
LOADV5D
d 200 mA
4.9
5.0
5.1
V
V5A Output Voltage
V
OUTV5A
1 mA d I
LOADV5A
d 200 mA
4.9
5.0
5.1
V
V33 Output Voltage
V
OUTV33
3.234 3.300 3.366
V
V5A to V5D Tracking
V
TRACK
50 mA d I
LOADV5A
, I
LOADV5D
d 200mA;
V
BB
> 6.5 V
25
25
mV
V5D Current Limit
I
OUTV5DLIM
200
300
mA
V5A Current Limit
I
OUTV5ALIM
200
300
mA
Base Drive Output Current
I
BD
1 V d V
OUTVADJ
, V
OUTV33
d 4 V
5.0
10.0 16.0
mA
Feedback Voltage
V
FB
1.16
1.20 1.24
V
Feedback Input Bias Current
I
FB
400 100 100
nA
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