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LMR14050

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SIMPLE SWITCHER® 40-V, 5-A, 2.2-MHz step-down converter with 40-μA IQ

Data sheet
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SIMPLE SWITCHER® 40-V, 5-A, 2.2-MHz step-down converter with 40-μA IQ

LMR14050

ACTIVE
Data sheet Order now

Product details

Parameters

Vin (Min) (V) 4 Vin (Max) (V) 40 Vout (Min) (V) 1 Vout (Max) (V) 36 Iout (Max) (A) 5 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 2500 Features Enable, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Pre-Bias Start-Up, Tracking, UVLO Adjustable, Soft Start Adjustable Control mode Current Mode Duty cycle (Max) (%) 98 Type Converter Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HSOIC (DDA) 8 19 mm² 4.9 x 3.9 open-in-new Find other Buck converters (integrated switch)

Features

  • 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
  • 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
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Description

The LMR14050 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.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LM73605 ACTIVE 3.5V to 36V, 5A Synchronous Step-Down Voltage Converter Next-generation 3.5-V to 36-V, 5-A synchronous step-down voltage converter.

Technical documentation

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Type Title Date
* Datasheet LMR14050 SIMPLE SWITCHER® 40 V 5 A, 2.2 MHz Step-Down Converter with 40 µA IQ datasheet (Rev. A) Mar. 17, 2015
Application notes Simple Solution for EMI Filter Stability Issue in DC/DC Converters (Rev. A) Apr. 25, 2019
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application notes How to Evaluate Junction Temperature Properly with Thermal Metrics (Rev. B) Mar. 29, 2019
Application notes How SYNC Logic Affects EMI Performance for Dual-Channel Buck Converters Apr. 27, 2018
Technical articles There are more ways than you think to reduce conducted EMI Apr. 16, 2018
Application notes Design Feedforward Capacitor for LMR14020 Dec. 20, 2017
Application notes How to Evaluate the Maximum Inductor in Internal Compensation PCM Buck Converter Sep. 20, 2017
Application notes Extending Buck Regulator to Positive Buck-Boost Configuration Sep. 02, 2017
User guides LMR14050EVM User's Guide Jan. 30, 2015
Application notes AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application notes AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application notes AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application notes AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$29.00
Description

The LMR14050SEVM is a fully assembled and tested circuit for evaluating the LMR14050S Step-Down Converter. The LMR14050SEVM operates from 7V to 36V input (12V nominal) and provides a 5.0V or 3.3V output at 5A. The board also has jumper connectors to enable or disable the converter operation, change (...)

Features
  • Input range: 7V to 36V
  • Output: 5.0V or 3.3V
  • Maximum load current: 5A
  • Switching frequency: 400KHz
  • Board size: 76mm x 76mm
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Design tools & simulation

SIMULATION MODELS Download
SNVM708.ZIP (62 KB) - PSpice Model
SIMULATION MODELS Download
SNVM923.ZIP (6 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
Low-Noise Fixed Drop-Out ±2.5 to ±12-VOUT 3A Power Supply Reference Design for Ultrasound CW Pulser
TIDA-01458 — This reference design allows a digitally programmable power supply to power an ultrasound transmit circuit for continuous wave (CW) mode from a 24-V bus. There are two outputs adjustable from ±2.5 to ±12 V under user software control. These outputs can provide up to 2 A with very low (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
7V to 40V Wide Input, 3-Output SIMPLE SWITCHER® Reference Design Using LMR14050 and LMZ20502
PMP10743 — The reference design shows the wide input voltage capability, simple layout, and small solution size of the LMR14050 SIMPLE SWITCHER® Buck Converter and the LMZ20502 Nano Module. The LMR14050 provides a 5V output rail which feeds into two LMZ20502 Nano Modules.  The modules provide a 3.3V (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
4.5V to 24V Wide Input, Negative 5V/2A Output Non-synchronous Converter Reference Design
PMP10680 — The PMP10680 reference design is a non-sync buck converter with buck-boost configuration. The PMP10680 accepts an input voltage of 4.5 to 24Vin and provides a negative 5V output capable of supplying continuous 2A of current to the load. With negative output and the self-positive input (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options

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Training series

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Videos

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