LM25011

ACTIVE

6-42V Wide Vin, 2A Constant-On Time Buck Regulator with Adjustable Current Limit

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LMR51420 ACTIVE SIMPLE SWITCHER® power converter 4.5V-to-36V, 2A, synchronous buck with 40µA IQ Smaller footprint in SOT-23 package, integrated compensation and synchronous rectification.

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 2 Vin (min) (V) 6 Vin (max) (V) 42 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 2000 Features Adjustable current limit, Over Current Protection, Power good Control mode Constant on-time (COT) Vout (min) (V) 2.51 Vout (max) (V) 40 Iq (typ) (µA) 1200 Duty cycle (max) (%) 99
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 2 Vin (min) (V) 6 Vin (max) (V) 42 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 2000 Features Adjustable current limit, Over Current Protection, Power good Control mode Constant on-time (COT) Vout (min) (V) 2.51 Vout (max) (V) 40 Iq (typ) (µA) 1200 Duty cycle (max) (%) 99
HVSSOP (DGQ) 10 14.7 mm² 3 x 4.9
  • LM25011-Q1 is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified (–40°C to +125°C Operating Junction Temperature)
  • LM25011A Allows Low-Dropout Operation at High Switching Frequency
  • Input Operating Voltage Range: 6 V to 42 V
  • Absolute Maximum Input Rating: 45 V
  • Integrated 2-A N-Channel Buck Switch
  • Adjustable Current Limit Allows for Smaller Inductor
  • Adjustable Output Voltage from 2.51 V
  • Minimum Ripple Voltage at VOUT
  • Power Good Output
  • Switching Frequency Adjustable to 2 MHz
  • COT Topology Features:
    • Switching Frequency Remains Nearly Constant with Load Current and Input Voltage Variations
    • Ultra-Fast Transient Response
    • No Loop Compensation Required
    • Stable Operation with Ceramic Output Capacitors
    • Allows for Smaller Output Capacitor and Current Sense Resistor
  • Adjustable Soft-Start Timing
  • Thermal Shutdown
  • Precision 2% Feedback Reference
  • Package: 10-Pin, HVSSOP
  • Create a Custom Design Using the LM25011 Family with the WEBENCH Power Designer
  • LM25011-Q1 is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified (–40°C to +125°C Operating Junction Temperature)
  • LM25011A Allows Low-Dropout Operation at High Switching Frequency
  • Input Operating Voltage Range: 6 V to 42 V
  • Absolute Maximum Input Rating: 45 V
  • Integrated 2-A N-Channel Buck Switch
  • Adjustable Current Limit Allows for Smaller Inductor
  • Adjustable Output Voltage from 2.51 V
  • Minimum Ripple Voltage at VOUT
  • Power Good Output
  • Switching Frequency Adjustable to 2 MHz
  • COT Topology Features:
    • Switching Frequency Remains Nearly Constant with Load Current and Input Voltage Variations
    • Ultra-Fast Transient Response
    • No Loop Compensation Required
    • Stable Operation with Ceramic Output Capacitors
    • Allows for Smaller Output Capacitor and Current Sense Resistor
  • Adjustable Soft-Start Timing
  • Thermal Shutdown
  • Precision 2% Feedback Reference
  • Package: 10-Pin, HVSSOP
  • Create a Custom Design Using the LM25011 Family with the WEBENCH Power Designer

The LM25011 constant on-time step-down switching regulator features all the functions needed to implement a low-cost, efficient, buck bias regulator capable of supplying up to 2 A of load current. This high-voltage regulator contains an N-Channel Buck switch, a startup regulator, current limit detection, and internal ripple control. The constant on-time regulation principle requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load. The adjustable valley current limit detection results in a smooth transition from constant voltage to constant current mode when current limit is reached, without the use of current limit foldback. The PGD output indicates the output voltage has increased to within 5% of the expected regulation value. Additional features include: Low output ripple, VIN under-voltage lock-out, adjustable soft-start timing, thermal shutdown, gate drive pre-charge, gate drive under-voltage lock-out, and maximum duty cycle limit.

The LM25011A has a shorter minimum off-time than the LM25011, which allows for higher frequency operation at low input voltages.

The LM25011 constant on-time step-down switching regulator features all the functions needed to implement a low-cost, efficient, buck bias regulator capable of supplying up to 2 A of load current. This high-voltage regulator contains an N-Channel Buck switch, a startup regulator, current limit detection, and internal ripple control. The constant on-time regulation principle requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load. The adjustable valley current limit detection results in a smooth transition from constant voltage to constant current mode when current limit is reached, without the use of current limit foldback. The PGD output indicates the output voltage has increased to within 5% of the expected regulation value. Additional features include: Low output ripple, VIN under-voltage lock-out, adjustable soft-start timing, thermal shutdown, gate drive pre-charge, gate drive under-voltage lock-out, and maximum duty cycle limit.

The LM25011A has a shorter minimum off-time than the LM25011, which allows for higher frequency operation at low input voltages.

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Technical documentation

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Type Title Date
* Data sheet LM25011, LM25011-Q1, LM25011A, LM25011A-Q1 42-V 2-A Constant On-Time Switching Regulator With Adjustable Current Limit datasheet (Rev. H) PDF | HTML 03 Sep 2014
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 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-1965 LM25011 Evaluation Board (Rev. B) 24 Apr 2013

Design & development

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Evaluation board

LM25011MY-EVAL — LM25011 Wide Vin Switching Regulator Evaluation Module

The LM25011EVAL 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 42V. The circuit features an adjustable load current in excess of (...)

User guide: PDF
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Simulation model

LM25011 PSpice Transient Model

SNVM168.ZIP (90 KB) - PSpice Model
Simulation model

LM25011 TINA-TI Load Transient Reference Design

SNVM519.TSC (149 KB) - TINA-TI Reference Design
Simulation model

LM25011 TINA-TI Startup Transient Reference Design

SNVM518.TSC (166 KB) - TINA-TI Reference Design
Simulation model

LM25011 TINA-TI Transient Spice Model

SNVM520.ZIP (21 KB) - TINA-TI Spice Model
Simulation model

LM25011 Unencrypted PSpice Transient Model

SNVMAL4.ZIP (3 KB) - PSpice Model
Simulation model

LM25011A PSpice Transient Model

SLVMDB6.ZIP (97 KB) - PSpice Model
Calculation tool

LM25011QUICK-CALC — LM25011 Quick Start Calculator

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HVSSOP (DGQ) 10 Ultra Librarian

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