Product details

Vin (Min) (V) 6 Vin (Max) (V) 42 Vout (Min) (V) 2.51 Vout (Max) (V) 40 Iout (Max) (A) 2 Iq (Typ) (uA) 1200 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 2000 Features Adjustable Current Limit, Over Current Protection, Power Good Operating temperature range (C) -40 to 125 Rating Automotive Regulated outputs (#) 1
Vin (Min) (V) 6 Vin (Max) (V) 42 Vout (Min) (V) 2.51 Vout (Max) (V) 40 Iout (Max) (A) 2 Iq (Typ) (uA) 1200 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 2000 Features Adjustable Current Limit, Over Current Protection, Power Good Operating temperature range (C) -40 to 125 Rating Automotive Regulated outputs (#) 1
HVSSOP (DGQ) 10 9 mm² 3 x 3
  • 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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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) 03 Sep 2014
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
User 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 (...)

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LM25011 PSpice Transient Model

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

LM25011 TINA-TI Startup Transient Reference Design

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

LM25011 TINA-TI Load Transient Reference Design

SNVM519.TSC (149 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
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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 (...)
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LM25011QUICK-CALC — LM25011 Quick Start Calculator

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This reference design implements a video over LVDS solution for automotive infotainment applications.It highlights the support of multi-touch with haptic feedback, LCD backlight control, and ambient light sensing, without the introduction of dedicated support lines back to the host processor. This (...)
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