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| MPQ4558 Datasheet, PDF (1/21 Pages) Monolithic Power Systems – 1A, 2MHz, 55V Step-Down Converter AEC-Q100 Qualified | |||
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The Future of Analog IC Technology
MPQ4558
1A, 2MHz, 55V
Step-Down Converter
AEC-Q100 Qualified
DESCRIPTION
The MPQ4558 is a high-frequency, step-down
switching regulator with an integrated internal
high-side high-voltage power MOSFET. It
provides up to a 1A output with current-mode
control for fast loop response and easy
compensation.
The wide 3.8V-to-55V input range accommodates
a variety of step-down applications, including
automotive input. A 12µA shutdown-mode supply
current makes it suitable for battery-powered
applications.
A scaled-down switching frequency in light-load
conditions provides high power-conversion
efficiency over a wide load range while reducing
switching and gate driver losses.
The frequency fold-back prevents inductor current
runaway during startup and thermal shutdown
provides reliable, fault-tolerant operation.
By switching at 2MHz, the MPQ4558 can prevent
EMI (electromagnetic interference) noise
problems, such as those found in AM radio and
ADSL applications.
The MPQ4558 is available in an SOIC8E and a
10-pin 3mm x 3mm QFN package.
FEATURES
⢠Guaranteed Industrial/Automotive
Temperature Range Limits
⢠Wide 3.8V-to-55V Operating Input Range
⢠250m⦠Internal Power MOSFET
⢠Up to 2MHz Programmable Switching
Frequency
⢠140μA Quiescent Current
⢠Stable with Ceramic Capacitors
⢠Internal Soft-Start
⢠Up to 95% Efficiency
⢠Output Adjustable from 0.8V to 52V
⢠Available in SOIC8E and 3mm x 3mm
QFN10 Packages
⢠Available in AEC-Q100 Grade 1
APPLICATIONS
⢠High-Voltage Power Conversion
⢠Automotive Systems
⢠Industrial Power Systems
⢠Distributed Power Systems
⢠Battery Powered Systems
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.
TYPICAL APPLICATION
R4 C4
24k 680pF
COMP
VIN
CONTROL
R3
200k
EN
BST
MPQ4558
FREQ
SW
FB
R2
40.2k
GND
C1
C3
100nF
D1
L1
C2
VIN
8V to 55V
VOUT
3.3V @ 1A
R1
127k
Efficiency @VOUT=3.3V
fs=500kHz
100
VIN=12V
90
80
70
60
VIN=55V
50
40
30
20
10
00
0.25 0.5 0.75
1
OUTPUT CURRENT (A)
MPQ4558 Rev. 1.01
www.MonolithicPower.com
1
5/17/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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