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LMR14050-Q1
SNVSAG2A –NOVEMBER 2015–REVISED JULY 2016
®
LMR14050-Q1 SIMPLE SWITCHER 40 V, 5 A Step-Down Converter with 40 µA IQ
1 Features
3 Description
The LMR14050-Q1 is a 40 V, 5 A step down
regulator with an integrated high-side MOSFET. With
a wide input range from 4 V to 40 V, it’s suitable for
various applications from industrial to automotive for
power conditioning from unregulated sources. An
extended family is available in 2 A and 3.5 A options
in pin-to-pin compatible packages, including
LMR14020-Q1 and LMR14030-Q1. The regulator’s
quiescent current is 40 µA in Sleep-mode, which is
suitable for battery powered systems. An ultra-low 1
μA current in shutdown mode can further prolong
battery life. A wide adjustable switching frequency
range allows either efficiency or external component
size to be optimized. Internal loop compensation
means that the user is free from the tedious task of
loop compensation design. This also minimizes the
external components of the device. A precision
enable input allows simplification of regulator control
and system power sequencing. The device also has
built-in protection features such as cycle-by-cycle
current limit, thermal sensing and shutdown due to
excessive power dissipation, and output overvoltage
protection.
1
•
Qualified for Automotive Applications
•
AEC-Q100 Qualified With the Following Results:
- Device Temperature Grade 1: -40 °C to 125 °C
Ambient Operating Temperature Range
- Device HBM ESD Classification Level H1C
- Device CDM ESD Classification Level C4A
•
•
•
•
•
•
•
4 V to 40 V Input Range
5 A Continuous Output Current
Ultra-low 40 µA Operating Quiescent Current
90 mΩ High-Side MOSFET
Minimum Switch-On Time: 75 ns
Current Mode Control
Adjustable Switching Frequency from 200 kHz to
2.5 MHz
•
•
•
•
•
•
•
•
•
Frequency Synchronization to External Clock
Spread Spectrum Option for Reduced EMI
Internal Compensation for Ease of Use
High Duty Cycle Operation Supported
Precision Enable Input
The LMR14050-Q1 is available in an 8-pin HSOIC or
10-pin WSON package with exposed pad for low
thermal resistance.
1 µA Shutdown Current
External Soft-start
Thermal, Overvoltage and Short Protection
8-Pin HSOIC with PowerPAD™ Package
(1)
Device Information
PART NUMBER
PACKAGE
BODY SIZE (NOM)
2 Applications
LMR14050SQDDARQ1
HSOIC (8)
4.89 mm x 3.90 mm
LMR14050SSQDDARQ1
(Spread Spectrum)
•
•
•
•
Automotive Battery Regulation
Industrial Power Supplies
Telecom and Datacom Systems
General Purpose Wide Vin Regulation
space
HSOIC (8)
WSON (10)
WSON (10)
4.89 mm x 3.90 mm
4.10 mm x 4.10 mm
4.10 mm x 4.10 mm
LMR14050QDPRRQ1
LMR14050SQDPRRQ1
(Spread Spectrum)
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
Efficiency vs Output Current
VIN up to 40 V
100
90
80
70
60
50
40
30
CIN
VIN
BOOT
SW
EN
CBOOT
L
VOUT
RT/SYNC
RT
D
RFBT
COUT
SS
RFBB
FB
CSS
GND
20
VOUT = 5 V
VOUT = 3.3 V
10
0
VIN = 12 V, ÖSW = 300 kHz
0.01
0.001
0.1
1 10
IOUT (A)
D001
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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