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A4407 Fiches technique(PDF) 27 Page - Allegro MicroSystems

No de pièce A4407
Description  The A4407 is an automotive power management IC that uses a 2.2 MHz constant on-time (COT) buck pre-regulator to supply a 5 V linear regulator, a 5 V tracking/protected linear regulator,
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Fabricant  ALLEGRO [Allegro MicroSystems]
Site Internet  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A4407 Fiches technique(HTML) 27 Page - Allegro MicroSystems

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2.2 MHz Constant On-Time Buck Regulator
With Two External and Two Internal Linear Regulators
A4407
27
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
t
V3.3V
I3.3V
C1
C2
V3.3V transient response, 125 to 250 mA; shows V3.3V (ch1, 50 mV/div.),
I3.3V (ch2, 100 mA/div.), t = 50 μs/div.
t
V1.5V transient response, 225 to 450 mA; shows V1.5V (ch1, 50 mV/div.),
I1.5V (ch2, 200 mA/div.), t = 50 μs/div.
V1.5V
I1.5V
C1
C2
t
VV5
IV5
C1
C2
VV5 transient response, 100 to 200 mA; shows VV5 (ch1, 50 mV/div.),
IV5 (ch2, 100 mA/div.), t = 50 μs/div.
t
VREG
IL
C1
C2
VREG short circuit operation at VIN = 12 V; shows VREG (ch1, 2 V/div.),
IL (ch2, 500 mA/div.), t = 5 μs/div.
t
VV5P transient response, 125 to 250 mA; shows VV5P (ch1, 50 mV/div.),
IV5P (ch2, 100 mA/div.), t = 50 μs/div.
VV5P
IV5P
C1
C2
t
VREG normal (left) and overload (right) operation at VIN = 12 V; shows
VREG (ch1, 2 V/div.), IL (ch2, 250 mA/div.)
VREG
VREG
Normal operation
(before overcurrent event)
Overloaded operation
(during overcurrent condition)
IL
IL
C1
C2


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