Triple Output Step-Down Switching Regulator
A4490
16
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Package ES, 20-Pin QFN
0.95
C
SEATING
PLANE
C0.08
21X
20
20
2
1
1
2
20
2
1
A
A
Terminal #1 mark area
Coplanarity includes exposed thermal pad and terminals
B
Exposed thermal pad (reference only, terminal #1
identifier appearance at supplier discretion)
For Reference Only
(reference JEDEC MO-220WGGD)
Dimensions in millimeters
Exact case and lead configuration at supplier discretion within limits shown
C
D
D
C
Reference land pattern layout (reference IPC7351
QFN50P400X400X80-21BM)
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)
4.10
0.30
0.50
4.10
0.50
0.75 ±0.05
2.60
2.60
0.25
+0.05
–0.07
0.40
+0.15
–0.10
4.00 ±0.15
4.00 ±0.15
2.60
2.60
B
PCB Layout Reference View
Triple Output Step-Down Switching Regulator
A4490
17
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
For the latest version of this document, visit our website:
www.allegromicro.com
Copyright ©2008-2013, Allegro MicroSystems, LLC
Allegro MicroSystems, LLC reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions as may be required to
permit improvements in the per for mance, 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 in for ma tion in clud ed herein is believed to be ac cu rate and reliable. How ev er, Allegro MicroSystems, LLC assumes no re spon si bil i ty for its
use; nor for any in fringe ment of patents or other rights of third parties which may result from its use.
Revision History
Revision Revision Date Description of Revision
Rev. 10 June 26, 2012 Update I
DD
and undervoltage lockout

APEK4490EES-01-T-DK

Mfr. #:
Manufacturer:
Description:
BOARD EVAL FOR A4490
Lifecycle:
New from this manufacturer.
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