LMR14050-Q1_16 Datasheet, PDF (1/35 Pages) Texas Instruments – LMR14050-Q1 SIMPLE SWITCHER® 40 V, 5 A Step-Down Converter with 40 μA IQ

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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 I_Q
1 Features
•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
• 1 µA Shutdown Current
• External Soft-start
• Thermal, Overvoltage and Short Protection
• 8-Pin HSOIC with PowerPAD™ Package
2 Applications
• Automotive Battery Regulation
• Industrial Power Supplies
• Telecom and Datacom Systems
• General Purpose Wide Vin Regulation
space
VIN up to 40 V
Simplified Schematic
CIN
RT
CSS
VIN
EN
BOOT
RT/SYNC
SW
SS
FB
GND
CBOOT
L
D
RFBT
RFBB
VOUT
COUT
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.
The LMR14050-Q1 is available in an 8-pin HSOIC or
10-pin WSON package with exposed pad for low
thermal resistance.
Device Information ⁽¹⁾
PART NUMBER
PACKAGE BODY SIZE (NOM)
LMR14050SQDDARQ1 HSOIC (8) 4.89 mm x 3.90 mm
LMR14050SSQDDARQ1
(Spread Spectrum)
HSOIC (8)
4.89 mm x 3.90 mm
LMR14050QDPRRQ1 WSON (10) 4.10 mm x 4.10 mm
LMR14050SQDPRRQ1
(Spread Spectrum)
WSON (10)
4.10 mm x 4.10 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Efficiency vs Output Current
100
90
80
70
60
50
40
30
20
10 V_IN = 12 V, g_SW = 300 kHz
0
V_OUT = 5 V
V_OUT = 3.3 V
0.001
0.01
0.1
1
10
I_OUT (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.