A8450KLB Allegro Microsystems Inc, A8450KLB Datasheet - Page 6

• Manufacturer Part Number: A8450KLB
• Description: IC REG MULTI-OUT AUTO 24-SOIC
• Manufacturer: Allegro Microsystems Inc
• Type: Step-Down (Buck)r

Specifications of A8450KLB

• Topology: Step-Down (Buck) (1), Linear (LDO) (4)
• Function: Automotive
• Number Of Outputs: 4
• Voltage/current - Output 1: 5.7V, 1.2A
• Voltage/current - Output 2: 5V, 200mA
• Voltage/current - Output 3: 5V, 200mA
• W/led Driver: No
• W/supervisor: No
• W/sequencer: Yes
• Voltage - Supply: 6 V ~ 45 V
• Operating Temperature: -40°C ~ 135°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Current - Output: 200mA, 550mA
• Voltage - Output: 3.3V, 5V, 5.7V, Adj
• Voltage - Input: 6 ~ 45 V
• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Frequency - Switching: -

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