LM25007

ACTIVE

9-42V Wide Vin, 0.5A, Constant On-Time Non-Synchronous Buck Regulator

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Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 0.5 Vin (min) (V) 9 Vin (max) (V) 42 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 800 Features Light Load Efficiency, Over Current Protection Control mode Constant on-time (COT) Vout (min) (V) 2.5 Vout (max) (V) 37 Iq (typ) (µA) 500 Duty cycle (max) (%) 99
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 0.5 Vin (min) (V) 9 Vin (max) (V) 42 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 800 Features Light Load Efficiency, Over Current Protection Control mode Constant on-time (COT) Vout (min) (V) 2.5 Vout (max) (V) 37 Iq (typ) (µA) 500 Duty cycle (max) (%) 99
VSSOP (DGK) 8 14.7 mm² 3 x 4.9 WSON (NGT) 8 16 mm² 4 x 4
  • Integrated 0.74Ω N-Channel MOSFET Switch
  • Guaranteed 0.5A Output Current
  • Ultra-Fast Transient Response
  • Up to 800kHz Operation
  • No Control Loop Compensation Required
  • Vin Feed Forward Provides Constant Operating Frequency
  • 2% Accurate 2.5V Feedback from -40°C to 125°C
  • Highly Efficient Operation
  • Intelligent Current Limit Protection
  • External Shutdown Control
  • Thermal Shutdown
  • VSSOP and Thermally Enhanced WSON Packages
  • Integrated 0.74Ω N-Channel MOSFET Switch
  • Guaranteed 0.5A Output Current
  • Ultra-Fast Transient Response
  • Up to 800kHz Operation
  • No Control Loop Compensation Required
  • Vin Feed Forward Provides Constant Operating Frequency
  • 2% Accurate 2.5V Feedback from -40°C to 125°C
  • Highly Efficient Operation
  • Intelligent Current Limit Protection
  • External Shutdown Control
  • Thermal Shutdown
  • VSSOP and Thermally Enhanced WSON Packages

The LM25007 is a monolithic step-down switching regulator featuring all of the functions needed to implement a low cost, efficient, power supply. Capable of driving a 0.5A load over a 9V-42V input voltage range, this device is easy to apply and is provided in the small VSSOP-8 and the thermally enhanced WSON-8 packages. Ultra-fast transient response is achieved through the use of a constant on-time architecture with Vin feed forward. This feature provides an almost constant operating frequency over load and input voltage variations. The operating frequency can be adjusted with a single resistor. This architecture is easy to use and tolerant of component selection. An intelligent current limit is implemented in the LM25007 with forced off time that is inversely proportional to Vout thus ensuring recovery from fault conditions. The output voltage may be set from 2.5V to >30V. To improve efficiency in light load applications, the Vcc pin can be connected to an external voltage source to eliminate the drop through the internal regulator. Additional features include: thermal shutdown, Vcc under-voltage lockout, gate drive under-voltage lockout, and max duty cycle limiter.

The LM25007 is a monolithic step-down switching regulator featuring all of the functions needed to implement a low cost, efficient, power supply. Capable of driving a 0.5A load over a 9V-42V input voltage range, this device is easy to apply and is provided in the small VSSOP-8 and the thermally enhanced WSON-8 packages. Ultra-fast transient response is achieved through the use of a constant on-time architecture with Vin feed forward. This feature provides an almost constant operating frequency over load and input voltage variations. The operating frequency can be adjusted with a single resistor. This architecture is easy to use and tolerant of component selection. An intelligent current limit is implemented in the LM25007 with forced off time that is inversely proportional to Vout thus ensuring recovery from fault conditions. The output voltage may be set from 2.5V to >30V. To improve efficiency in light load applications, the Vcc pin can be connected to an external voltage source to eliminate the drop through the internal regulator. Additional features include: thermal shutdown, Vcc under-voltage lockout, gate drive under-voltage lockout, and max duty cycle limiter.

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Technical documentation

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Type Title Date
* Data sheet LM25007 42V, 0.5A Step-Down Switching Regulator datasheet (Rev. C) 20 Feb 2013
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Analysis & Design of Hysteretic Constant Freq Buck Regr Using the LM5007 (Rev. B) 30 Apr 2013
EVM User's guide AN-1453 LM25007 Evaluation Board (Rev. A) 24 Apr 2013
Application note Boot Capacitor Regulation in LM25007 Constant-On-Time (COT) Converter (Rev. A) 23 Apr 2013

Design & development

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

Simulation model

LM25007 PSpice Transient Model

SNVM245.ZIP (58 KB) - PSpice Model
Simulation model

LM25007 Unencrypted PSpice Transient Model

SNVMAL3.ZIP (3 KB) - PSpice Model
Calculation tool

LM25007QUICK-CALC — LM25007 Quick Start Calculator

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

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