6-75V Wide Vin, 600mA Constant On-Time Non-Synchronous Buck Regulator


Product details


Vin (Min) (V) 6 Vin (Max) (V) 75 Vout (Min) (V) 2.5 Vout (Max) (V) 75 Iout (Max) (A) 0.65 Iq (Typ) (uA) 1000 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 800 Features Enable, Over Current Protection, Power Good, UVLO Adjustable Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VSSOP (DGS) 10 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)


  • Operating Input Voltage Range: 6V to 75V
  • Integrated 80V, N-Channel Buck Switch
  • Internal Start-Up Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Operating Frequency Remains Constant with Line and Load Variations
  • Adjustable Output Voltage from 2.5V
  • Precision Internal Reference, ±2.5%
  • Intelligent Current Limit Reduces Foldback
  • Programmable Input UV Detector with Status Flag Output
  • Gate Output Driver for Synchronous Rectifier
  • Pre-Charge Switch Enables Bootstrap Gate Drive with no Load
  • Thermal Shutdown


  • VSSOP - 10

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The LM5006 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient Buck bias regulator. This high voltage regulator contains an 80V N-Channel MOSFET Switch and a startup regulator. The device is easy to implement and is provided in an VSSOP-10 package. The regulator’s control scheme uses an on-time inversely proportional to VIN. This feature results in the operating frequency remaining relatively constant with line and load variations. The control scheme requires no loop compensation, resulting in fast transient response. An intelligent current limit is implemented with a forced off-time which is inversely proportional to VOUT. This scheme ensures short circuit control while providing minimum foldback. Other features include: Thermal Shutdown, VCC Under Voltage Lock-out, Max Duty Cycle Limiter, a Pre-charge Switch, a programmable Under Voltage Detector with a status flag output, and a gate driver output for a synchronous rectifier.

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Technical documentation

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Type Title Date
* Data sheet LM5006 80V, 600 mA Constant On-Time Buck Switching Regulator datasheet (Rev. B) Mar. 21, 2013
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical article Eight switching circuits to power wide VIN applications - brought to you by Vijay Choudhary and presented by Santa’s reindeer Dec. 18, 2013
White paper Wide VIN power management ICs simplify white paper (Rev. A) Sep. 19, 2013
User guide AN-2050 LM5006 Evaluation Board (Rev. A) Apr. 25, 2013
Application note AN-2171 Designing Constant-On-Time Buck Regulators for Low Drop-Out Voltage (Rev. A) Apr. 23, 2013
More literature High-Voltage PoL Power Solutions Jan. 30, 2012

Design & development

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Hardware development

document-generic User guide
The LM5006EVAL evaluation board provides the design engineer with a fully functional buck regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 5V output over an input range of 6V to 75V. The circuit delivers load currents to 500 mA, with current limit (...)

Design tools & simulation

SNVM703.ZIP (34 KB) - PSpice Model
SNVMAL5.ZIP (3 KB) - PSpice Model
PSpice® for TI design and simulation tool
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
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  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

20V-75V input,14.5V@0.3A output dual-rail BUCK converter solution
PMP4357 — This design demonstrates simple sync-buck solution which covers wide input range from 20V to 75V. The output voltage are 15V0.3A(regulated) and 14.5V0.3A(post regulated).
Design files
Class 1 Non-isolated Buck Converter (5V/560mA) for PoE PD Applications Reference Design
PMP9676 This converter is used for Class 1 PoE PD applications where isolation is not required.  The TPS2378 PD controller plus LM5006 buck converter provide 5V/560mA with good efficieny in a small size.  The LM5006 can be configured with a diode rectifier for lowest cost or a synchronous FET (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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VSSOP (DGS) 10 View options

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