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| MPQ28261 Datasheet, PDF (1/20 Pages) Monolithic Power Systems – 21V, 3A, 500kHz Synchronous Step-Down Coverter | |||
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The Future of Analog IC Technology
MPQ28261
21V, 3A, 500kHz Synchronous
Step-Down Coverter
DESCRIPTION
The MPQ28261 is a synchronous, rectified,
step-down, switch-mode converter with built-in
120m⦠high-side MOSFET and 20m⦠low-side
MOSFET. It offers a very compact solution to
achieve a continuous 3A output current over a
wide input supply range, with excellent load and
line regulation. Its synchronous mode operation
increases its efficiency over its output current
load range, and uses a fixed 500kHz switching
frequency.
Current mode operation provides a fast
transient response and improves loop
stabilization. Full protection features include
over-current protection and thermal shut down.
The MPQ28261 has an external SS pin to
program the soft-start time and power-good
signal output.
The MPQ28261 requires a minimal number of
readily-available standard external components
and is available in a space saving 3mmx4mm
14-pin QFN package.
TYPICAL APPLICATION
FEATURES
⢠Wide 4.5V-to-21V Operating Input Range
⢠3A Maximum Continuous Output Current
⢠Integrated 120m⦠High-Side and 20mâ¦
Low-Side Power MOSFETs
⢠1% Reference Voltage Accuracy
⢠Up to 85% Efficiency (for Drops of 12V to
1.2V)
⢠Fixed 500kHz Switching Frequency
⢠External Soft-Start
⢠PG Output
⢠OCP and Thermal Shutdown
⢠Output Adjustable from 0.603V to 18V
⢠Available in a 3mm x 4mm 14-pin QFN
Package.
APPLICATIONS
⢠DSL Modems
⢠Cable Modems
⢠Set-Top Boxes
⢠Telecom
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
âMPSâ and âThe Future of Analog IC Technologyâ are registered trademarks of
Monolithic Power Systems, Inc.
4.5V-21V
VIN
C1
22uF
ON/OFF
VCC
R10
100K
1 IN
BST 6
MPQ28261
9 PG
SW 2,3,4,5
C4
0.1uF
11
VCC
FB 8
C3
0.1uF L1
2.8uH
R1
Rt
10K
24K
7 EN
SS 10
R2
GND AGND
C7
10K
12,13 14
47nF
VOUT
1.2V/3A
C2
47uF
Efficiency vs. Load Current
VOUT=1.2V
100
90
80
70
VIN=4.5V
60
50
VIN=12V
40
30 VIN=21V
20
10
0
0 0.5 1 1.5 2 2.5 3 3.5
LOAD CURRENT (A)
MPQ28261 Rev. 1.12
www.MonolithicPower.com
1
10/10/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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