A8450KLB Allegro Microsystems Inc, A8450KLB Datasheet - Page 7

• 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
10%
V
V5D Regulator
V5A Regulator
t (50 μs/Div.)
t (50 μs/Div.)
IN
t (0.2 μs/Div.)
= 12 V; I
I
LOAD
t
RISE
LOAD
= 100 mA; T
Load Transients Diagrams
Automotive Multioutput Voltage Regulator
90%
A
= 25°C; ac-coupled; C1, C2, C3 and C4 = 1 μF
*For the adjustable regulator, the transient load response
is improved as the voltage is reduced. This is due to the
ability of the regulator to provide more base drive (V ADJBD )
because of more available voltage. When the adjustable
regulator approaches 3.3 V, its transient load response is
equivalent to the response of the V33 regulator.
For all regulators, load transients can be improved by
increasing the output capacitance (C1, C2, C3, and C4).
In order to keep ESR down it is best to use ceramic type
capacitors. However, large values in ceramic type capacitors
are either not available or very expensive. If larger values are
needed, above 22 μF, electrolytic capacitors with low ESR
ratings can be used. Performance can be improved further
by adding a 1 μF ceramic in parallel with the electrolytic.
Adjustable Regulator, at 1.8 V*
3.3 V Regulator
t (50 μs/Div.)
t (50 μs/Div.)
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
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