LM5008

ACTIVE

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

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Product details

Parameters

Vin (Min) (V) 9.5 Vin (Max) (V) 95 Vout (Min) (V) 2.5 Vout (Max) (V) 75 Iout (Max) (A) 0.35 Iq (Typ) (uA) 485 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 600 Features Enable, 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

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)

Features

  • 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

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Description

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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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

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Type Title Date
* Datasheet LM5008 95-V, 350-mA, Constant On-Time DC/DC Buck Switching Regulator datasheet (Rev. I) Oct. 11, 2018
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application note Stability Analysis and Design of COT Type-3 Ripple Circuit Mar. 20, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
White paper Wide VIN power management ICs simplify white paper (Rev. A) Sep. 19, 2013
User guide AN-1330 LM5008 Evaluation Board (Rev. B) Apr. 30, 2013
User guide AN-1925 LM5008A Evaluation Board (Rev. C) Apr. 30, 2013
Application note Analysis & Design of Hysteretic Constant Freq Buck Regr Using the LM5007 (Rev. B) Apr. 30, 2013
Application note Boot Capacitor Regulation in LM25007 Constant-On-Time (COT) Converter (Rev. A) Apr. 23, 2013
Application note Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) Apr. 23, 2013

Design & development

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Hardware development

EVALUATION BOARD Download
25
Description

LM5008 High Voltage (100V) Step Down Switching Regulator

Features
  • Integrated 100V, 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 (...)

Design tools & simulation

SIMULATION MODEL Download
SNVM389.ZIP (181 KB) - PSpice Model
SIMULATION MODEL Download
SNVM527.ZIP (12 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SNVM528.TSC (583 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVM529.TSC (584 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVM953.ZIP (2 KB) - PSpice Model
SIMULATION TOOL Download
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Features
  • 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
  • (...)
CALCULATION TOOL Download

CAD/CAE symbols

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

Ordering & quality

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