LMR14050-Q1 Datasheet, PDF (1/33 Pages) Texas Instruments – SIMPLE SWITCHER 40 V, 5 A Step-Down Converter

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LMR14050-Q1
SNVSAG2 – NOVEMBER 2015
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
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. 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
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
2 Applications
• Automotive Battery Regulation
• Industrial Power Supplies
• Telecom and Datacom Systems
• General Purpose Wide Vin Regulation
space
Simplified Schematic
VIN up to 40 V
CIN
RT
VIN
EN
BOOT
RT/SYNC
SW
CBOOT
L
D
RFBT
SS
FB
CSS
GND
RFBB
VOUT
COUT
(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
0.001
0.01
0.1
I_OUT (A)
V_OUT = 5 V
V_OUT = 3.3 V
1
10
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.