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LMR14050SDDAR

5A buck converter, 4-40V in, adj 0.8-32V out, 2.1MHz, WSON-12

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Manufacturer Part：

LMR14050SDDAR

Package：

WSON-12 (5×5 mm, 0.8mm pitch, PowerPAD)

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Description

Product Overview

The LMR14050SDDAR from Texas Instruments is a 5A, 40V step-down (buck) converter with an integrated 90 mΩ high-side MOSFET. Operating from 4V to 40V input with adjustable output down to 0.8V, it features 2.1 MHz switching frequency for compact solution size. The ultra-low 1 µA shutdown current and 25 µA quiescent current in Eco-mode make it ideal for battery-powered and automotive systems.

Key Specifications

Topology Buck (Step-Down)
Input Voltage Range 4V to 40V
Output Current 5A continuous
Output Voltage Range 0.8V to 32V (adjustable)
Switching Frequency 2.1 MHz (fixed)
Integrated MOSFET RDS(ON) 90 mΩ (high-side)
Quiescent Current 25 µA (Eco-mode)
Shutdown Current 1 µA
Reference Voltage 0.8V (±1%)
Operating Temperature -40°C to +150°C (junction)
Package WSON-12 (5×5 mm) with PowerPAD

Features

  • Wide 4V to 40V input range for automotive and industrial
  • 5A continuous output with integrated 90 mΩ MOSFET
  • 2.1 MHz fixed switching frequency for compact design
  • Ultra-low 1 µA shutdown current
  • 25 µA quiescent current in Eco-mode (PFM)
  • Internal soft-start limits inrush current
  • Cycle-by-cycle current limit and thermal shutdown
  • Pulse skipping (Eco-mode) for improved light-load efficiency

Applications

  • Automotive 12V/24V step-down power supply
  • Industrial 24V bus point-of-load regulation
  • Battery-powered equipment with long standby time
  • Embedded system 5V/3.3V rail generation
  • Telecom and networking power supply

The LMR14050SDDAR from Texas Instruments is a 5A step-down buck converter with integrated 90 mΩ high-side MOSFET operating from 4V to 40V input. Its 2.1 MHz switching frequency enables compact filter design, while the 1 µA shutdown and 25 µA Eco-mode quiescent currents extend battery life in always-on applications. Adjustable output from 0.8V to 32V with cycle-by-cycle current limit and thermal shutdown provide robust power conversion for automotive and industrial systems.

The LMR14050SDDAR uses a constant-frequency current-mode control architecture. An internal oscillator generates a 2.1 MHz clock. The error amplifier compares the FB pin voltage with the 0.8V internal reference, and the PWM comparator modulates the duty cycle of the integrated high-side NMOS switch. Current-mode control provides inherent cycle-by-cycle current limiting and excellent line transient response. In Eco-mode (pulse skipping), the device enters PFM operation at light loads to reduce switching losses and maintain high efficiency. The internal bootstrap circuit generates gate drive voltage above VIN for the high-side MOSFET. The PowerPAD on the WSON package provides a low thermal resistance path to the PCB for heat dissipation.

Pin Name Type Function
1 BOOT I/O Bootstrap capacitor (0.1µF to SW)
2 VIN Power Input supply (4-40V)
3 EN Input Enable (float to enable, pull below 1.2V to disable)
4 FB Input Feedback (connect to output voltage divider)
5 SS I/O Soft-start (connect capacitor to GND)
6-8 GND Power Ground (connect to PowerPAD)
9-11 SW Output Switch node (connect to inductor)
12 NC — No connect
Pad PowerPAD Power Thermal pad (connect to GND plane)
  • Automotive 12V/24V to 5V or 3.3V step-down power supply
  • Industrial 24V bus point-of-load regulation for PLCs and sensors
  • Battery-powered equipment requiring long standby with 1µA shutdown
  • Embedded system 5V/3.3V rail from 12V or 24V source
  • Telecom and networking equipment DC-DC conversion
Manufacturer Part Number Package Notes
TI LMR16050SDDAR WSON-12 60V input, lower frequency (0.8MHz)
TI TPS5450DDAR SOIC-8 EP 5.5-36V, 5A, 500kHz, higher Iq
Monolithic Power MP8759GD-Z QFN-12 4.5-36V, 5A, 500kHz
TI LM46002PWP HTSSOP-16 3.5-60V, 2A, simple switcher
Richtek RT6208GQW WDFN-10 4.5-36V, 5A, 1MHz
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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