MP28255
21V, 4A, 500kHz
Synchronous Step-down Converter
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP28255 is a high frequency synchronous
rectified step-down switch mode converter with
built in internal power MOSFETs. It offers a
very compact solution to achieve 4A continuous
output current over a wide input supply range
with excellent load and line regulation. The
MP28255 operates at high efficiency over a
wide output current load range.
•
•
•
•
•
•
•
•
•
•
•
•
•
Current mode operation provides fast transient
response and eases loop stabilization.
Full protection features include OCP and thermal
shut down.
The MP28255 requires a minimum number of
readily available standard external components
and is available in a space saving 3mm x 4mm
14-pin QFN package.
Wide 4.5V to 21V Operating Input Range
4A Output Current
Low RDS(ON) Internal Power MOSFETs
Proprietary Switching Loss Reduction
Technique
Fixed 500kHz Switching Frequency
External Soft-Start
Sync from 300kHz to 2MHz External Clock
Internal Compensation
Integrated Bootstrap Diode
Over-Current Protection and Hiccup
Thermal Shutdown
Output Adjustable from 0.8V
Available in 14-pin QFN3x4 Package
APPLICATIONS
•
•
•
•
•
Networking Systems
Digital Set Top Boxes
Personal Video Recorders
Flat Panel Television and Monitors
Distributed Power Systems
For MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
The information in this datasheet about the product and its associated
technologies are proprietary and intellectual property of Monolithic Power
Systems and are protected by copyright and pending patent applications
TYPICAL APPLICATION
4.5V-21V
1
VIN
IN
BST
6
C1
22uF
PG
C4
0.1uF
9 PG
R3
100K
11
C3
0.1uF
ON/OFF
7
SW
L1
2uH
2,3,4,5
1.2V/4A
MP28255
VCC
FB
EN/SYNC
SS
GND
12,13
Rt
24K
8
10
C5
47nF
R1
4.99K
C2
47uF
R2
10K
AGND
14
MP28255 Rev. 1.02
www.MonolithicPower.com
9/16/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
MP28255 – 4A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
ORDERING INFORMATION
Part Number*
Package
Top Marking
Free Air Temperature (TA)
MP28255EL
3x4 QFN14
28255
-20°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP28255EL–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP28255EL–LF–Z)
PACKAGE REFERENCE
SS
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage VIN .......................................22V
VSW ......................... -0.3V (-5V for65%
VIN
In this case, an external BST diode is
recommended from the VCC pin to BST pin, as
shown in Figure 8
MP28255
Figure 8—Add Optional External Bootstrap
Diode to Enhance Efficiency
The recommended external BST diode is IN4148,
and the BST cap is 0.1~1µF.
MP28255 Rev. 1.02
www.MonolithicPower.com
9/16/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
13
MP28255 – 4A, 21V, SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
PACKAGE INFORMATION
3mm x 4mm QFN14
2.90
3.10
1.60
1.80
0.30
0.50
PIN 1 ID
SEE DETAIL A
PIN 1 ID
MARKING
1
14
0.18
0.30
3.20
3.40
3.90
4.10
PIN 1 ID
INDEX AREA
0.50
BSC
7
8
TOP VIEW
BOTTOM VIEW
0.80
1.00
0.20 REF
PIN 1 ID OPTION A
0.30x45º TYP.
PIN 1 ID OPTION B
R0.20 TYP.
0.00
0.05
SIDE VIEW
DETAIL A
2.90
0.70
NOTE:
1.70
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX.
4) JEDEC REFERENCE IS MO-229, VARIATION VGED-3.
5) DRAWING IS NOT TO SCALE.
0.25
3.30
0.50
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP28255 Rev. 1.02
www.MonolithicPower.com
9/16/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
14
很抱歉,暂时无法提供与“MP28255EL-LF-P”相匹配的价格&库存,您可以联系我们找货
免费人工找货