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LM5009A

ACTIVE

6-95V Wide Vin, 150mA 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

Vin (min) (V) 6 Vin (max) (V) 95 Vout (min) (V) 2.5 Vout (max) (V) 85 Iout (max) (A) 0.15 Iq (typ) (mA) 0.485 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 Control mode Constant on-time (COT) Duty cycle (max) (%) 99 Type Converter
Vin (min) (V) 6 Vin (max) (V) 95 Vout (min) (V) 2.5 Vout (max) (V) 85 Iout (max) (A) 0.15 Iq (typ) (mA) 0.485 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 Control mode Constant on-time (COT) Duty cycle (max) (%) 99 Type Converter
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 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 (4 mm × 4 mm) Packages
  • 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 (4 mm × 4 mm) Packages

The LM5009A is a functional variant of the LM5009 COT buck switching regulator. The functional differences of the LM5009A 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 LM5009A step-down switching regulator features all of the functions required to implement a low cost, efficient, buck bias regulator. This high voltage regulator contains an 100-V N-channel buck switch. The device is easy to implement and is provided in the 8-pin VSSOP and the thermally enhanced 8-pin WSON packages. The regulator is based on a control scheme using 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, undervoltage lockout (VCC), gate drive undervoltage lockout, max duty cycle limiter, and a precharge switch.

The LM5009A is a functional variant of the LM5009 COT buck switching regulator. The functional differences of the LM5009A 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 LM5009A step-down switching regulator features all of the functions required to implement a low cost, efficient, buck bias regulator. This high voltage regulator contains an 100-V N-channel buck switch. The device is easy to implement and is provided in the 8-pin VSSOP and the thermally enhanced 8-pin WSON packages. The regulator is based on a control scheme using 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, undervoltage lockout (VCC), gate drive undervoltage lockout, max duty cycle limiter, and a precharge switch.

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Technical documentation

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Type Title Date
* Data sheet LM5009A 100-V, 150-mA Constant ON-Time Buck Switching Regulator datasheet (Rev. H) PDF | HTML 30 Sep 2016
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013
EVM User's guide AN-1955 LM5009A Evaluation Board (Rev. A) 30 Apr 2013

Design & development

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

Evaluation board

LM5009AEVAL — LM5009A 150 mA, 100V Wide Vin Step-Down Switching Regulator Evaluation Module

The LM5009AEVAL 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 150 mA, with current (...)

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

LM5009 TINA-TI Transient Reference Design

SNVM035.TSC (141 KB) - TINA-TI Reference Design
Simulation model

LM5009 TINA-TI Transient Spice Model

SNVM036.ZIP (15 KB) - TINA-TI Spice Model
Calculation tool

LM5009AQUICK-CALC — LM5009A Quick Start Calculator

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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

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