LM25011-Q1

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Automotive 6-42V Wide Vin, 2A Constant-On Time Non-Synchronous Buck Regulator w/ Adj Current Limit

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Product details

Parameters

Vin (Min) (V) 6 Vin (Max) (V) 42 Vout (Min) (V) 2.51 Vout (Max) (V) 40 Iout (Max) (A) 2 Iq (Typ) (mA) 1.2 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 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HVSSOP (DGQ) 10 15 mm² 3 x 4.9 open-in-new Find other Buck converters (integrated switch)

Features

  • 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

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Description

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
* Datasheet LM25011, LM25011-Q1, LM25011A, LM25011A-Q1 42-V 2-A Constant On-Time Switching Regulator With Adjustable Current Limit datasheet (Rev. H) Sep. 03, 2014
White papers Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guides AN-1965 LM25011 Evaluation Board (Rev. B) Apr. 24, 2013

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
25
Description

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 (...)

Design tools & simulation

SIMULATION MODELS Download
SNVM168.ZIP (90 KB) - PSpice Model
SIMULATION MODELS Download
SNVM518.TSC (166 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM519.TSC (149 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVM520.ZIP (21 KB) - TINA-TI Spice Model
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SNVMAL4.ZIP (3 KB) - PSpice Model
SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
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 TOOLS Download
LM25011 Quick Start Calculator
LM25011QUICK-CALC

Reference designs

REFERENCE DESIGNS Download
Automotive TFT LCD Display Solution
TIDA-00169 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Non sync buck controller with 6 to 20V input and 3.3V @ 1A output
PMP7758 — PMP7758 is a non-synchronous buck DC-DC controller with 6-20V DC input and 3.3V @ 1A output. It is a low cost, efficient switching regulator. It uses LM25011 which contains an N channel buck switch, a startup regulator, current limit detection, and internal ripple control. The constant on-time (...)
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HVSSOP (DGQ) 10 View options

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