6-95V Wide Vin, 350mA Constant On-Time Non-Synchronous Buck Regulator


Product details


Vin (Min) (V) 6 Vin (Max) (V) 95 Vout (Min) (V) 2.5 Vout (Max) (V) 75 Iout (Max) (A) 0.35 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 600 Features Enable, Over Current Protection Control mode Constant on-time (COT) Duty cycle (Max) (%) 99 Type Converter Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VSSOP (DGK) 8 15 mm² 3 x 4.9 WSON (NGU) 8 16 mm² 4 x 4 open-in-new Find other Buck converters (integrated switch)


  • Operating Input Voltage Range: 6 V to 95 V
  • Integrated 100-V N-Channel Buck Switch
  • Internal Start-Up Regulator
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • On-Time Varies Inversely With Input Voltage
  • Operating Frequency Remains Constant With Varying Line Voltage and Load Current
  • Adjustable Output Voltage From 2.5 V
  • Highly Efficient Operation
  • Precision Internal Reference
  • Low Bias Current
  • Intelligent Current Limit
  • Thermal Shutdown
  • 8-Pin VSSOP and 8-Pin WSON Packages
  • Create a Custom Design Using the LM5008A With the WEBENCH® Power Designer

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The LM5008A DC/DC converter is a functional variant of the LM5008 COT Buck Switching Regulator. The functional differences of the LM5008A are: the minimum input operating voltage is 6 V, the on-time equation is slightly different, and the requirement for a minimum load current is removed.

The LM5008A 350-mA step-down switching regulator features all of the functions required 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 6 V to 95 V. The device is easy to implement and is provided in 8-pin VSSOP and the thermally enhanced 8-pin WSON packages. The converter uses PWM control scheme with an on-time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The control scheme 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 control while providing minimum foldback. Other features include: thermal shutdown, VCC undervoltage lockout, gate drive undervoltage lockout, maximum duty cycle limiter, and a pre-charge switch.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LM5018 ACTIVE 7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator 7.5-V to 100-V Wide Vin, 300-mA constant on-time synchronous buck regulator.

Technical documentation

Design & development

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Hardware development

document-generic User guide

The LM5008AEVAL 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 8V to 75V. The circuit delivers load currents to 300 mA, with current (...)

Design tools & simulation

SNVM527.ZIP (12 KB) - TINA-TI Spice Model
SNVM528.TSC (583 KB) - TINA-TI Reference Design
SNVM529.TSC (584 KB) - TINA-TI Reference Design
SNVM953.ZIP (2 KB) - PSpice Model
LM5008A Quick Start Calculator

CAD/CAE symbols

Package Pins Download
VSSOP (DGK) 8 View options
WSON (NGU) 8 View options

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