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LMR14050-Q1_V01

更新时间： 2024-11-24 02:50:19
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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 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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