Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

A4405 Fiches technique(PDF) 14 Page - Allegro MicroSystems

No de pièce A4405
Description  The A4405 is an automotive power management IC that uses a high frequency constant on-time 5.45 V pre-regulator to supply two internal 5 V linear regulators and a 3.3 V linear DMOS driver.
Download  27 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  ALLEGRO [Allegro MicroSystems]
Site Internet  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A4405 Fiches technique(HTML) 14 Page - Allegro MicroSystems

Back Button A4405 Datasheet HTML 10Page - Allegro MicroSystems A4405 Datasheet HTML 11Page - Allegro MicroSystems A4405 Datasheet HTML 12Page - Allegro MicroSystems A4405 Datasheet HTML 13Page - Allegro MicroSystems A4405 Datasheet HTML 14Page - Allegro MicroSystems A4405 Datasheet HTML 15Page - Allegro MicroSystems A4405 Datasheet HTML 16Page - Allegro MicroSystems A4405 Datasheet HTML 17Page - Allegro MicroSystems A4405 Datasheet HTML 18Page - Allegro MicroSystems Next Button
Zoom Inzoom in Zoom Outzoom out
 14 / 27 page
background image
Constant On-Time Buck Regulator
With One External and Two Internal Linear Regulators
A4405
14
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
V5 Regulator
The 5 V linear regulator is provided to supply local circuitry. This
regulator can deliver 300 mA (typ), 215 mA (min). When a direct
short is applied to this regulator the output the current folds back
to 0 V at approximately 100 mA (typ) (figure 4).
V5P Tracking Regulator
The 5VP linear tracking regulator is provided to supply remote
circuitry such as off-board sensors. The V5P pin is monitored and
if a short to ground or a short to battery occurs the V5P output is
disabled and/or disconnected and the other outputs (VREG, V5,
and V33) remain active until the short is removed. The regulator
can deliver 375 mA (typ), 270 mA (min). When a direct short is
applied to this regulator the output the current folds back to 0 V
at approximately 112 mA (typ) (figure 5).
The V5P regulator is designed to track the V33 output during
power-up and when the device is completing a soft start ramp.
The V5P regulator tracks the 3.3 V output to within ±0.5% under
normal steady state operating conditions. If the V33 regulator is
decreasing, the V5P regulator accurately tracks the V33 output
down to the point at which a V33 undervoltage fault (2.825 V
nominally: 2.95 V – 125 mV) results in the NPOR output
going active.
The figures 6 and 7 show A4405 operation when the V5P pin
is shorted to ground and VIN (battery). In both cases, the V5P
output is disabled and/or disconnected while the other outputs
(VREG, V5, and V33) remain active.
Figure 6. V5P is shorted to ground in 5 μs (DV5P is populated); shows
VVREG (ch1, 2 V/div.), VV33 (ch2, 1 V/div.), VV5 (ch3, 2 V/div.), VV5P (ch4,
2 V /div.), t = 10 μs/div.
t
VV33
VV5
VV5P
VVREG
C1
C3
C4
C2
Figure 7. V5P is shorted to a 25 V battery; shows VVREG (ch1, 2 V/div.),
VV33 (ch2, 2 V/div.), VIN pin (ch3, 5 V/div.), VV5P (ch4, 5 V/div.),
t = 10 μs/div.
6
5
4
3
2
1
0
50
75 100 125 150 175 200 225 250 275 300 325 350 375 400
Output Current (mA)
Typical
Maximum
6
5
4
3
2
1
0
50
100
150
200
250
300
350
Output Current (mA)
400
450
500
Typical
Maximum
Figure 4. Foldback current limit of the 5V regulator
Figure 5. Foldback current limit of the 5VP regulator
t
VV33
VREG
VV5P
5 V
25 V
30 V
VIN pin
Ringing due to parasitics from a long wire
V5P is clamped to a safe level above VIN
by D2 (see application schematic)
All


Numéro de pièce similaire - A4405

FabricantNo de pièceFiches techniqueDescription
logo
Littelfuse
A440 LITTELFUSE-A440 Datasheet
204Kb / 2P
   GAS DISCHARGE TUBE - 8x10mm
logo
Allegro MicroSystems
A4401 ALLEGRO-A4401 Datasheet
417Kb / 17P
   This device provides all the necessary control functions to provide the power rails for driving a vacuum fluorescent display (VFD) using minimal external components.
A4401KL-T ALLEGRO-A4401KL-T Datasheet
416Kb / 17P
   Automotive Quasi-Resonant Flyback Control IC
A4402 ALLEGRO-A4402 Datasheet
378Kb / 15P
   Constant On-Time Buck Converter with Integrated Linear Regulator
A4402 ALLEGRO-A4402 Datasheet
378Kb / 15P
   Constant On-Time Buck Converter with Integrated Linear Regulator
More results

Description similaire - A4405

FabricantNo de pièceFiches techniqueDescription
logo
Allegro MicroSystems
A4406 ALLEGRO-A4406 Datasheet
1Mb / 27P
   The A4406 is an automotive power management IC that uses a high frequency constant on-time 5.45 V pre-regulator to supply an internal 5 V linear regulator and a 3.3 V linear DMOS driver.
A4407 ALLEGRO-A4407 Datasheet
1Mb / 29P
   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,
logo
ON Semiconductor
CS5204-1 ONSEMI-CS5204-1_06 Datasheet
239Kb / 9P
   4.0 A Adjustable, and 3.3 V and 5.0 V Fixed Linear Regulators
September, 2006 ??Rev. 9
CS5206-3 ONSEMI-CS5206-3 Datasheet
77Kb / 10P
   6.0 A Adjustable, and Fixed 3.3 V and 5.0 V Linear Regulators
January, 2004 ??Rev. 7
CS5204-1 ONSEMI-CS5204-1 Datasheet
73Kb / 10P
   4.0 A Adjustable, and 3.3 V and 5.0 V Fixed Linear Regulators
January, 2004 ??Rev. 8
CS5205-1 ONSEMI-CS5205-1 Datasheet
245Kb / 9P
   5.0 A Adjustable, and 3.3 V and 5.0 V Fixed Linear Regulators
September, 2006??Rev. 8
CS5203-3 ONSEMI-CS5203-3 Datasheet
172Kb / 6P
   3.0 A, 3.3 V Fixed Linear Regulator
September, 2006 ??Rev. 7
CS52015-3 ONSEMI-CS52015-3 Datasheet
217Kb / 8P
   1.5 A, 3.3 V Fixed Linear Regulator
September, 2006 ??Rev. 8
CS5201-3 ONSEMI-CS5201-3 Datasheet
191Kb / 8P
   1.0 A, 3.3 V Fixed Linear Regulator
September, 2006 ??Rev. 8
CS5203A-1 ONSEMI-CS5203A-1 Datasheet
86Kb / 10P
   3.0 A Adjustable, and Fixed 1.5 V, 3.3 V and 5.0 V Linear Regulators
June, 2004 ??Rev. 7
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com