7-75V Wide Vin, 2.5A Current Mode Non-Synchronous Buck Regulator


Product details


Vin (Min) (V) 7 Vin (Max) (V) 75 Vout (Min) (V) 1.23 Vout (Max) (V) 70 Iout (Max) (A) 2.5 Iq (Typ) (uA) 3000 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 500 Features Enable, Frequency Synchronization, Over Current Protection Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Buck converters (integrated switch)


  • High-Efficiency DC-DC Buck Converter
    • Wide Input Voltage Range From 7 V to 75 V
    • Adjustable Output Voltage as Low as 1.225 V
    • Output Current as High as 2.5 A
    • Junction Temperature Range –40°C to 125°C
  • Integrated 75-V, 160-mΩ Buck MOSFET
  • Meets EN55022 and CISPR 22 EMI Standards
  • ±1.5% Feedback Voltage Accuracy
  • Emulated Peak Current-Mode Control
    • Ultra-Fast Line and Load Transient Response
  • Switching Frequency From 50 kHz to 500 kHz
  • Master or Slave Frequency Synchronization Input
  • 80-ns Minimum PWM ON Time For Low VOUT
  • Monotonic Start-up into Prebiased Output
  • Internal High-Voltage VCC Bias Supply Regulator
  • Auxiliary Bias Supply Option to VCC
  • Configurable Soft Start With Tracking
  • Precision Standby and Shutdown Input
    • Programmable Input UVLO With Hysteresis
  • Remote Shutdown and Standby Control
  • Cycle-by-Cycle Overcurrent Protection
  • VCC and Gate Drive UVLO Protection
  • Thermal Shutdown Protection With Hysteresis
  • Thermally-Enhanced 20-Pin HTSSOP Package
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The LM5005 high-voltage buck converter features all of the functions necessary to implement an efficient high-voltage switching regulator with a minimum number of external components. This easy-to-use converter operates over an input voltage range from 7 V to 75 V and delivers a maximum output current of 2.5 A. The control loop architecture is based upon current-mode control using an emulated current ramp for high noise immunity. Current-mode control provides inherent line feed-forward, cycle-by-cycle overcurrent protection and straightforward loop compensation. The use of an emulated control ramp reduces noise sensitivity of the PWM circuit, allowing reliable control of small duty cycles necessary in high input voltage applications.

The switching frequency is resistor-programmable from 50 kHz to 500 kHz. To reduce EMI, an oscillator synchronization pin allows multiple LM5005 regulators to self-synchronize or be synchronized to an external clock signal. Additional protection features include configurable soft start, external power supply tracking, thermal shutdown with automatic recovery, and remote shutdown capability.

The LM5005 is available in an 20-pin HTSSOP package with an exposed pad that is soldered to the PCB to achieve a low junction-to-board thermal impedance. To create a custom regulator design, use the LM5005 with WEBENCH® Power Designer.

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Technical documentation

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Type Title Date
* Datasheet LM5005 75-V, 2.5-A Step-Down Switching Regulator With Wide Input Voltage Range datasheet (Rev. E) Nov. 11, 2016
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) Jul. 03, 2018
User guide AN-1748 LM5005 Evaluation Board (Rev. A) Apr. 30, 2013

Design & development

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Hardware development

document-generic User guide

LM5005 High Voltage 2.5 Amp Buck Regulator

  • Integrated 75V, 2.5A N-Channel Buck Switch
  • Ultra-wide Input Voltage Range from 7V to 75V
  • Internal High Voltage Bias Regulator
  • Adjustable Output Voltage from 1.225V
  • 1.5% Feedback Reference Accuracy
  • Current Mode Control with Emulated Inductor Current Ramp
  • Single Resistor Oscillator Frequency Setting
  • (...)

Design tools & simulation

SNVMAB6.ZIP (256 KB) - PSpice Model
SNVMAL0.ZIP (4 KB) - PSpice Model
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PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
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HTSSOP (PWP) 20 View options

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