LM3100

ACTIVE

Synchronous 1MHz 1.5A Step-Down Voltage Regulator

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Product details

Parameters

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Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Buck converters (integrated switch)

Features

  • Input Voltage Range 4.5 V to 36 V
  • 1.5 A Output Current
  • 0.8 V, ±1.5% Reference
  • Integrated 40 V, Dual N-Channel Buck Synchronous Switches
  • Low Component Count and Small Solution Size
  • No Loop Compensation Required
  • Ultra-Fast Transient Response
  • Stable With Ceramic and Other Low ESR Capacitors
  • Programmable Switching Frequency up to 1 MHz
  • Max. Duty Cycle Limited During Start-Up
  • Valley Current Limit
  • Precision Internal Reference for Adjustable Output Voltage Down to 0.8 V
  • Thermal Shutdown
  • Thermally Enhanced HTSSOP-20 Package

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Description

The LM3100 Synchronously Rectified Buck Converter features all functions needed to implement a highly efficient, cost effective buck regulator capable of supplying 1.5 A to loads with voltages as low as 0.8 V. Dual 40 V N-Channel synchronous MOSFET switches allow for low external component thus reducing complexity and minimizing board space. The LM3100 is designed to work exceptionally well with ceramic and other very low ESR output capacitors. The Constant ON-Time (COT) regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. Through the use of a unique design the regulator does not rely on output capacitor ESR for stability, as do most other COT regulators. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The operating frequency can be externally programmed up to 1 MHz. Protection features include VCC under-voltage lockout, thermal shutdown and gate drive under-voltage lockout. The part is available in a thermally enhanced HTSSOP-20 package

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LMR23615 ACTIVE SIMPLE SWITCHER®, 36-V, 1.5-A Synchronous Step-Down Converter Next-generation 36-V, 1.5-A synchronous step-down converter.

Technical documentation

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Type Title Date
* Datasheet LM3100 Synchronous 1MHz 1.5A Step-Down Voltage Regulator datasheet (Rev. H) Oct. 04, 2017
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Selection guides Control-Mode Quick Reference Guide (Rev. A) Sep. 14, 2017
White papers Synchronous Rectification in High-Performance Power Converter Design (Rev. A) Sep. 15, 2016
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
User guides AN-1443 LM3100 Demonstration Board Reference Design (Rev. C) Apr. 29, 2013
Application notes AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application notes AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application notes AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr. 23, 2013
Application notes AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr. 23, 2013
Application notes AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr. 23, 2013
Application notes AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application notes AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application notes AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
Application notes AN-2218 Precision Current Limiting with the LMP8646 and LM3102 (Rev. A) Apr. 23, 2013
Application notes Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) Apr. 23, 2013
Application notes Input and Output Capacitor Selection Sep. 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application notes AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
79
Description

LM3100 1.5A Simple Synchronous Buck Regulator

Features
  • Input voltage range 4.5V-36V
  • 1.5A output current
  • Integrated 40V, dual N-Channel buck synchronous switches
  • Low component count, all ceramic caps, small board space
  • No loop compensation required
  • Ultra-fast transient response
  • Stable with low ESR capacitors
  • Programmable switching frequency up to 1MHz
  • Max. duty (...)

Design tools & simulation

SIMULATION MODELS Download
SNVM145.ZIP (245 KB) - PSpice Model
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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
  • (...)

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Package Pins Download
HTSSOP (PWP) 20 View options

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