A4447 Просмотр технического описания (PDF) - Allegro MicroSystems
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A4447 Datasheet PDF : 9 Pages
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A4447
High Voltage Step Down Regulator
Package LJ, 8 Pin SOIC
4.90 ±0.10
8
2.41 NOM
B
A
12
3.30 NOM
3.90 ±0.10 6.00 ±0.20
8X
0.10 C
0.51
0.31
1.27 BSC
Branded Face
C
SEATING
PLANE
1.70 MAX
0.15
0.00
8°
0°
0.25
0.17
1.04 REF
0.65
8
1.75
1.27
2.41 5.60
1.27
0.40
0.25 BSC
SEATING PLANE
GAUGE PLANE
12
3.30
C PCB Layout Reference View
For Reference Only; not for tooling use (reference MS-012BA)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
A Terminal #1 mark area
B Exposed thermal pad (bottom surface); dimensions may vary with device
C Reference land pattern layout (reference IPC7351
SOIC127P600X175-9AM); all pads a minimum of 0.20 mm from all
adjacent pads; adjust as necessary to meet application process
requirements and PCB layout tolerances; when mounting on a multilayer
PCB, thermal vias at the exposed thermal pad land can improve 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
Copyright ©2008-2009, Allegro MicroSystems, Inc.
The products described here are manufactured under one or more U.S. patents or U.S. 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 per-
mit 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’s products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the
failure of that life support device or system, or to affect the safety or effectiveness of that device or system.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use;
nor for any infringement of patents or other rights of third parties which may result from its use.
For the latest version of this document, visit our website:
www.allegromicro.com
Allegro MicroSystems, Inc.
9
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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