LM5008

ACTIVE

9.5-95V Wide Vin, 350mA Constant On-Time Non-Synchronous Buck Regulator

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LM5163 ACTIVE 100-V input, 0.5-A synchronous buck DC/DC converter with ultra-low IQ Synchronous rectification for smaller footprint and high efficiency and low IQ.

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 0.35 Vin (min) (V) 9.5 Vin (max) (V) 95 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 600 Features Enable, Over Current Protection Control mode Constant on-time (COT) Vout (min) (V) 2.5 Vout (max) (V) 75 Iq (typ) (µA) 485 Duty cycle (max) (%) 99
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 0.35 Vin (min) (V) 9.5 Vin (max) (V) 95 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 600 Features Enable, Over Current Protection Control mode Constant on-time (COT) Vout (min) (V) 2.5 Vout (max) (V) 75 Iq (typ) (µA) 485 Duty cycle (max) (%) 99
VSSOP (DGK) 8 14.7 mm² 3 x 4.9 WSON (NGU) 8 16 mm² 4 x 4
  • Operating Input Voltage Range: 6 V to 95 V
  • Integrated 100-V, N-Channel Buck Switch
  • Internal VCC Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • On-Time Varies Inversely With Line Voltage
  • Operating Frequency Remains Constant With Varying Line Voltage and Load Current
  • Adjustable Output Voltage
  • Highly Efficient Operation
  • Precision Internal Reference
  • Low Bias Current
  • Intelligent Current Limit Protection
  • Thermal Shutdown
  • 8-Pin VSSOP and WSON Packages
  • Create a Custom Design Using the LM5008 With the WEBENCH® Power Designer
  • Operating Input Voltage Range: 6 V to 95 V
  • Integrated 100-V, N-Channel Buck Switch
  • Internal VCC Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • On-Time Varies Inversely With Line Voltage
  • Operating Frequency Remains Constant With Varying Line Voltage and Load Current
  • Adjustable Output Voltage
  • Highly Efficient Operation
  • Precision Internal Reference
  • Low Bias Current
  • Intelligent Current Limit Protection
  • Thermal Shutdown
  • 8-Pin VSSOP and WSON Packages
  • Create a Custom Design Using the LM5008 With the WEBENCH® Power Designer

The LM5008 350-mA step-down switching converter features all of the functions needed to implement a low-cost and efficient buck regulator. This high-voltage converter has an integrated 100-V N-channel buck switch and operates over an input voltage range of 9 V to 95 V. The device is easy to implement and is provided in the 8-pin VSSOP and the thermally enhanced 8-pin WSON packages. The converter uses a hysteretic control scheme with a PWM on-time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The hysteretic control requires no loop compensation. An intelligent current limit is implemented with forced off-time, which is inversely proportional to VOUT. This scheme ensures short-circuit protection while providing minimum foldback. Other protection features include: thermal shutdown, VCC undervoltage lockout, gate drive undervoltage lockout, and maximum duty cycle limiter.

The LM5008 350-mA step-down switching converter features all of the functions needed to implement a low-cost and efficient buck regulator. This high-voltage converter has an integrated 100-V N-channel buck switch and operates over an input voltage range of 9 V to 95 V. The device is easy to implement and is provided in the 8-pin VSSOP and the thermally enhanced 8-pin WSON packages. The converter uses a hysteretic control scheme with a PWM on-time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The hysteretic control requires no loop compensation. An intelligent current limit is implemented with forced off-time, which is inversely proportional to VOUT. This scheme ensures short-circuit protection while providing minimum foldback. Other protection features include: thermal shutdown, VCC undervoltage lockout, gate drive undervoltage lockout, and maximum duty cycle limiter.

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Technical documentation

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Type Title Date
* Data sheet LM5008 95-V, 350-mA, Constant On-Time DC/DC Buck Switching Regulator datasheet (Rev. I) PDF | HTML 11 Oct 2018
Application note Stability Analysis and Design of COT Type-3 Ripple Circuit 20 Mar 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013
EVM User's guide AN-1330 LM5008 Evaluation Board (Rev. B) 30 Apr 2013
EVM User's guide AN-1925 LM5008A Evaluation Board (Rev. C) 30 Apr 2013
Application note Analysis & Design of Hysteretic Constant Freq Buck Regr Using the LM5007 (Rev. B) 30 Apr 2013
Application note Boot Capacitor Regulation in LM25007 Constant-On-Time (COT) Converter (Rev. A) 23 Apr 2013
Application note Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) 23 Apr 2013

Design & development

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

Evaluation board

LM5008EVAL — 100V Wide Vin Step Down Switching Regulator Evaluation Module

LM5008 High Voltage (100V) Step Down Switching Regulator

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

LM5008 PSpice Transient Model

SNVM389.ZIP (181 KB) - PSpice Model
Simulation model

LM5008 TINA-TI Reference Design

SNVM529.TSC (584 KB) - TINA-TI Reference Design
Simulation model

LM5008 TINA-TI Transient Reference Design

SNVM528.TSC (583 KB) - TINA-TI Reference Design
Simulation model

LM5008 TINA-TI Transient Spice Model

SNVM527.ZIP (12 KB) - TINA-TI Spice Model
Simulation model

LM5008 Unencrypted PSpice Transient Model

SNVM953.ZIP (2 KB) - PSpice Model
Calculation tool

LM5008QUICK-CALC — LM5008 Quick Start Calculator

Package Pins CAD symbols, footprints & 3D models
VSSOP (DGK) 8 Ultra Librarian
WSON (NGU) 8 Ultra Librarian

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