MPQ4458 Datasheet, PDF (1/16 Pages) Monolithic Power Systems – Industrial Grade ,1A, 4MHz, 36V Step-Down Converter

The Future of Analog IC Technology
DESCRIPTION
The MPQ4458 is a high frequency step-down
switching regulator with an integrated internal
high-side high voltage power MOSFET. It
provides 1 A output with current mode control
for fast loop response and easy compensation.
The wide 3.8V to 36V input range
accommodates a variety of step-down
applications, including those in automotive
systems. A 120µA operational quiescent current
is suitable for use in battery-powered
applications.
The frequency foldback helps prevent inductor
current runaway during startup and thermal
shutdown provides reliable, fault tolerant
operation.
By switching at 4MHz, the MPQ4458 prevents
EMI (Electromagnetic Interference) noise
problems, such as those found in AM radio and
ADSL applications.
The MPQ4458 is available in thin 10-pin 3mm x 3mm
TQFN package.
MPQ4458
Industrial Grade ,1A, 4MHz, 36V
Step-Down Converter
FEATURES
• Guaranteed Industrial Temp Range
• 120μA Quiescent Current
• Wide 3.8V to 36V Operating Input Range
• 300mΩ Internal Power MOSFET
• Up to 4MHz Programmable Switching
Frequency
• Ceramic Capacitor Stable
• Internal Soft-Start
• Precision Current Limit without a Current
Sensing Resistor
• Up to 95% Efficiency
• Output Adjustable from 0.8V to 30V
• Available in 10-Pin 3x3 TQFN Package
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 Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
CONTROL
C3
150pF
4
COMP
8, 9
VIN
C6
NS
3
EN
10
BST
MPQ4458
7
FREQ
1, 2
SW
5
FB
6
GND
C4
L1
100nF 2.2∝H
10MQ100N
C2
22∝F
V_IN
36V Max
V_OUT
5V @ 1A
Efficiency vs
Load Current
100
90
V_I=5V
80
V_I=24V
70
V_I=12V
60
50
40
30
V_O=3.3V
20
0
500
1000
LOAD CURRENT (mA)
MPQ4458 Rev. 1.0
www.MonolithicPower.com
1
12/5/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.