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LMR14050

ACTIVE

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

A newer version of this product is available

open-in-new Compare alternates
Same functionality with different pin-out to the compared device
LMR51450 ACTIVE 36-V, 5-A synchronous buck converter Smaller solution size, higher efficiency and lower EMI.

Product details

Vin (min) (V) 4 Vin (max) (V) 40 Vout (min) (V) 1 Vout (max) (V) 36 Iout (max) (A) 5 Iq (typ) (mA) 0.04 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, Soft Start Adjustable, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
Vin (min) (V) 4 Vin (max) (V) 40 Vout (min) (V) 1 Vout (max) (V) 36 Iout (max) (A) 5 Iq (typ) (mA) 0.04 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, Soft Start Adjustable, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
HSOIC (DDA) 8 29.4 mm² 4.9 x 6
  • 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
  • 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

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.

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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Technical documentation

Design & development

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

Evaluation board

LMR14050SEVM — LMR14050S Step-Down Converter Evaluation Module

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 (...)

User guide: PDF
Not available on TI.com
Simulation model

LMR14050S PSPICE Transient Model

SNVM708.ZIP (62 KB) - PSpice Model
Simulation model

LMR14050S Unencrypted PSpice Transient Model

SNVM923.ZIP (6 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Reference designs

TIDA-01458 — Low-Noise Fixed Drop-Out ±2.5 to ±12-VOUT 3A Power Supply Reference Design for Ultrasound CW Pulser

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 (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP10743 — 7V to 40V Wide Input, 3-Output SIMPLE SWITCHER® Reference Design Using LMR14050 and LMZ20502

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 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP10680 — 4.5V to 24V Wide Input, Negative 5V/2A Output Non-synchronous Converter Reference Design

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, (...)
Test report: PDF
Schematic: PDF
Package Pins Download
HSOIC (DDA) 8 View options

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