MPQ4458
Industrial Grade ,1A, 4MHz, 36V
Step-Down Converter
The Future of Analog IC Technology
FEATURES
DESCRIPTION
Guaranteed Industrial Temp Range
The MPQ4458 is a high frequency step-down
120 A Quiescent Current
switching regulator with an integrated internal
Wide 3.8V to 36V Operating Input Range
high-side high voltage power MOSFET. It
300m Internal Power MOSFET
provides 1 A output with current mode control
Up to 4MHz Programmable Switching
for fast loop response and easy compensation.
Frequency
The wide 3.8V to 36V input range
Ceramic Capacitor Stable
accommodates a variety of step-down
Internal Soft-Start
applications, including those in automotive
Precision Current Limit without a Current
systems. A 120A operational quiescent current
Sensing Resistor
is suitable for use in battery-powered
Up to 95% Efficiency
applications.
Output Adjustable from 0.8V to 30V
The frequency foldback helps prevent inductor
Available in 10-Pin 3x3 TQFN Package
current runaway during startup and thermal
APPLICATIONS
shutdown provides reliable, fault tolerant
operation.
High Voltage Power Conversion
Automotive Systems
By switching at 4MHz, the MPQ4458 prevents
Industrial Power Systems
EMI (Electromagnetic Interference) noise
problems, such as those found in AM radio and Distributed Power Systems
ADSL applications. Battery Powered Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
The MPQ4458 is available in thin 10-pin 3mm x 3mm
status, please visit MPS website under Products, Quality Assurance page.
TQFN package.
MPS and The Future of Analog IC Technology are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs
Load Current
100
V =5V
I
C3
90
150pF
4 8, 9
COMP VIN V
IN
80
36V Max V =24V
I
3 10
V =12V
70 I
CONTROL EN BST
C4
MPQ4458
100nF 60
7
1, 2
FREQ SW V
OUT
5V @ 1A 50
10MQ100N
5 6
FB GND
40
V =3.3V
30
O
20
0 500 1000
LOAD CURRENT (mA)
MPQ4458 Rev. 1.01 www.MonolithicPower.com 1
1/27/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
2014 MPS. All Rights Reserved.
EFFICIENCY (%)MPQ4458 INDUSTRIAL GRADE,1A, 4MHz, 36V STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number* Package Top Marking
TQFN10 (3mm x3mm)
MPQ4458DQT T2
* For Tape & Reel, add suffix Z (e.g. MPQ4458DQTZ).
For RoHS Compliant packaging, add suffix LF (e.g. MPQ4458DQTLFZ)
PACKAGE REFERENCE
TOP VIEW
SW 1 10 BST
SW 2 9 VIN
EN 3 8 VIN
COMP 4 7 FREQ
FB 5 6 GND
EXPOSED PAD
ON BACKSIDE
(1) (4)
ABSOLUTE MAXIMUM RATINGS Thermal Resistance
JA JC
Supply Voltage (V ).....................0.3V to +40V
IN TQFN10 (3mm x3mm)............ 50...... 12... C/W
Switch Voltage (V )............ 0.3V to V + 0.3V
SW IN
Notes:
BST to SW .....................................0.3V to +6V
1) Exceeding these ratings may damage the device.
All Other Pins.................................0.3V to +6V
2) The maximum allowable power dissipation is a function of the
(2)
maximum junction temperature T (MAX), the junction-to-
J
Continuous Power Dissipation (T = +25C)
A
ambient thermal resistance , and the ambient temperature
JA
.............................................................2.5W
T . The maximum allowable continuous power dissipation at
A
any ambient temperature is calculated by P (MAX) = (T
D J
Junction Temperature...............................150C
(MAX)-T )/ . Exceeding the maximum allowable power
A JA
Lead Temperature ....................................260C
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
Storage Temperature.............. 65C to +150C
shutdown circuitry protects the device from permanent
(3)
damage.
Recommended Operating Conditions
3) The device is not guaranteed to function outside of its
operating conditions.
Supply Voltage V ...........................3.8V to 36V
IN
4) Measured on JESD51-7 4-layer board.
Output Voltage V .........................0.8V to 30V
OUT
Operating Junct. Temp (T )..... 40 C to +125 C
J
MPQ4458 Rev. 1.01 www.MonolithicPower.com 2
1/27/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
2014 MPS. All Rights Reserved.