A8447 Просмотр технического описания (PDF) - Allegro MicroSystems
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A8447 Datasheet PDF : 9 Pages
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A8447
High Voltage Step Down Regulator
Package LJ 8 Pin SOIC
0.65 .025
NOM
C
5.4 .211
NOM
6 X 0.20 .008
MIN
1.27 .050
NOM
2X 0.20 .008
MIN
2.41 .094
NOM
5.00 .197
8
4.80 .189
B
A
6.20 .244
5.80 .228
0.25 [.010] M B M
A
B
4.00 .157
3.80 .150
2.41 .095
NOM
8º
0º
0.25 .010
0.17 .007
1.27 .050
0.40 .016
1.95 .076
NOM
3.3 .129
NOM
1
2
3.30 .130
NOM
8X
0.10 [.004] C
8X
0.51
0.31
.020
.012
0.25 [.010] M C A B
1.27 .050
Preliminary dimensions, for reference only
Dimensions in millimeters
U.S. Customary dimensions (in.) in brackets, for reference only
(reference JEDEC MS-012 AA)
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
SEATING C
PLANE
1.75 .069
1.35 .053
0.25 .010
0.10 .004
0.25 .010
SEATING PLANE
GAUGE PLANE
A Terminal #1 mark area
B Exposed thermal pad (bottom surface)
C Reference land pattern layout (reference IPC7351 SOIC127P602X147-9AM); adj
necessary to meet application process requirements and PCB layout tolerances;
mounting on a multilayer PCB, thermal vias at the exposed thermal pad land can
thermal dissipation (reference EIA/JEDEC Standard JESD51-5)
Pin Out Diagram
BOOT 1
8 VIN
ENB 2
7 LX
Pad
TSET 3
6 VBIAS
GND 4
5 FB
Terminal List Table
Number
1
2
3
4
5
6
7
8
Name
BOOT
ENB
TSET
GND
FB
VBIAS
LX
VIN
Description
Gate drive boost node
On/off control; logic input
Off-time setting
Ground
Feedback for adjustable regulator
Bias supply input
Buck switching node
Supply input
The products described herein are manufactured under one or more patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to
permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that
the information being relied upon is current.
Allegro products are not authorized for use as critical components in life-support appliances, devices, or systems without express written ap-
proval.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its
use; nor for any infringements of patents or other rights of third parties that may result from its use.
Copyright © 2006 Allegro MicroSystems, Inc.
Allegro MicroSystems, Inc.
9
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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