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Automotive Multioutput Voltage Regulator
A8450
6
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
V
REG
V
OUTV33
V
OUTVADJ
V
OUTVADJ
V
ENBAT
V
ENBAT
VENB
V
ENB
V
NPOR
V
NPOR
V
NPOR
V
BB
V
REG
V
OUTV33
V
OUTV5A/V5D
VREG Monitor
V
CP
V
REG
V
OUTV33
V
OUTVADJ
V
UVLOV33
t
POR
t
POR
t
POR
t
POR
V
HYSV33
V
UVLOV33
V
BB
> 6 V
V
REG
= 1.8 V
V
UVLOVREG
V
UVLOVADJ
V
HYSVADJ
A B
POR event initiates
+7 V
Slope of VOUTV33 and VOUTVADJ from A to B determined by ILOAD and output capacitor (C3, C4).
ENBAT signals power-on
Charge pump ramping
Charge pump OK flag set
V
UVLOV33
 exceeded; VADJ enabled
V
UVLO(33)
ENB signals power-off
V33 can sustain regulation with normal load by bulk capacitor (COUT) on V
REG
.
Slope of V
REG 
(which controls V
OUTV5A/V5D
,
 
V
OUTV33
, and V
OUTVADJ
) from A to B determined by I
LOAD
 and COUT.
A
B
t
POR
t
SS
Timing Diagrams
Figure 1a. NPOR fault due to undervoltage lockout on the V33 or FB pins
Figure 1b. Power-off using V
BB
Figure 1c. Power-on using ENBAT, followed by power-off using ENB
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