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LM3102

ACTIVE

Synchronous 1MHz 2.5A Step-Down Voltage Regulator

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Data sheet

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LMR33630 ACTIVE SIMPLE SWITCHER® 3.8V to 36V, 3A Synchronous Buck Converter With Ultra-Low EMI Smaller footprint, higher efficiency, lower IQ and lower EMI.

LM3102

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 2.5 Vin (min) (V) 4.5 Vin (max) (V) 42 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 1000 Features Enable, Over Current Protection, Synchronous Rectification, Tracking Control mode COT with emulated ripple Vout (min) (V) 0.8 Vout (max) (V) 7 Iq (typ) (µA) 1000 Duty cycle (max) (%) 94
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 2.5 Vin (min) (V) 4.5 Vin (max) (V) 42 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 1000 Features Enable, Over Current Protection, Synchronous Rectification, Tracking Control mode COT with emulated ripple Vout (min) (V) 0.8 Vout (max) (V) 7 Iq (typ) (µA) 1000 Duty cycle (max) (%) 94
DSBGA (YPA) 28 0.5625 mm² 0.75 x 0.75 HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • Low Component Count and Small Solution Size
  • Stable With Ceramic and Other Low-ESR Capacitors
  • No Loop Compensation Required
  • High Efficiency at a Light Load by DCM Operation
  • Prebias Start-Up
  • Ultra-Fast Transient Response
  • Programmable Soft-Start
  • Programmable Switching Frequency up to 1 MHz
  • Valley Current Limit
  • Output Overvoltage Protection
  • Precision Internal Reference for an Adjustable Output Voltage Down to 0.8 V
  • Thermal Shutdown
  • Key Specifications
    • Input Voltage Range 4.5 V to 42 V
    • 2.5-A Output Current
    • 0.8 V, ±1.5% Reference
    • Integrated Dual N-Channel Main and Synchronous MOSFETs
    • Thermally Enhanced HTSSOP-20 Package
  • Low Component Count and Small Solution Size
  • Stable With Ceramic and Other Low-ESR Capacitors
  • No Loop Compensation Required
  • High Efficiency at a Light Load by DCM Operation
  • Prebias Start-Up
  • Ultra-Fast Transient Response
  • Programmable Soft-Start
  • Programmable Switching Frequency up to 1 MHz
  • Valley Current Limit
  • Output Overvoltage Protection
  • Precision Internal Reference for an Adjustable Output Voltage Down to 0.8 V
  • Thermal Shutdown
  • Key Specifications
    • Input Voltage Range 4.5 V to 42 V
    • 2.5-A Output Current
    • 0.8 V, ±1.5% Reference
    • Integrated Dual N-Channel Main and Synchronous MOSFETs
    • Thermally Enhanced HTSSOP-20 Package

The LM3102 Synchronously Rectified Buck Converter features all required functions to implement a highly efficient and cost-effective buck regulator. The device can supply 2.5 A to loads with an output voltage as low as 0.8 V. Dual N-channel synchronous MOSFET switches allow a low component count, thus reducing complexity and minimizing board size.

Different from most other COT regulators, the LM3102 does not rely on output capacitor ESR for stability, and is designed to work exceptionally well with ceramic and other very low-ESR output capacitors. The device requires no loop compensation, results in a fast load transient response and simple circuit implementation. The operating frequency remains nearly constant with line 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 undervoltage lockout (UVLO), output overvoltage protection, thermal shutdown, and gate drive UVLO. The LM3102 is available in the thermally enhanced HTSSOP-20 package, and LM3102 is also available in a DSBGA low-profile chip-scale package with reduced output current.

The LM3102 Synchronously Rectified Buck Converter features all required functions to implement a highly efficient and cost-effective buck regulator. The device can supply 2.5 A to loads with an output voltage as low as 0.8 V. Dual N-channel synchronous MOSFET switches allow a low component count, thus reducing complexity and minimizing board size.

Different from most other COT regulators, the LM3102 does not rely on output capacitor ESR for stability, and is designed to work exceptionally well with ceramic and other very low-ESR output capacitors. The device requires no loop compensation, results in a fast load transient response and simple circuit implementation. The operating frequency remains nearly constant with line 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 undervoltage lockout (UVLO), output overvoltage protection, thermal shutdown, and gate drive UVLO. The LM3102 is available in the thermally enhanced HTSSOP-20 package, and LM3102 is also available in a DSBGA low-profile chip-scale package with reduced output current.

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Technical documentation

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Type Title Date
* Data sheet LM3102 Synchronous 1-MHz, 2.5-A Step-Down Voltage Regulator datasheet (Rev. I) PDF | HTML 23 Jan 2018
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
White paper Synchronous Rectification in High-Performance Power Converter Design (Rev. A) 15 Sep 2016
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 12 Sep 2014
User guide AN-1646 LM3102 Demonstration Board Reference Design (Rev. A) 29 Apr 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23 Apr 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23 Apr 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 23 Apr 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 23 Apr 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 23 Apr 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23 Apr 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23 Apr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 Apr 2013
Application note AN-2200 Precision Current Limiting with the LMP8646 and LMZ12003 (Rev. A) 23 Apr 2013
Application note AN-2218 Precision Current Limiting with the LMP8646 and LM3102 (Rev. A) 23 Apr 2013
User guide AN-1646 LM3102 Demonstration Board Reference Design 01 Oct 2007
Application note Input and Output Capacitor Selection 19 Sep 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 12 Jul 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) 03 May 2004

Design & development

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

Evaluation board

LM3102EVAL — SIMPLE SWITCHER® Synchronous 1MHz 2.5A Step-Down Voltage Regulator Evaluation Module

  • Low component count and small solution size
  • Stable with ceramic and other low ESR capacitors
  • No loop compensation required
  • High efficiency at a light load by DCM operation
  • Pre-bias startup
  • Ultra-fast transient response
  • Programmable soft-start
  • Programmable switching frequency up to 1 MHz
  • Valley current (...)
User guide: PDF
Not available on TI.com
Simulation model

LM3102 PSpice Transient Model

SNVM096.ZIP (225 KB) - PSpice Model
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Simulation model

LM3102 TINA-TI Line Transient Reference Design

SNVM068.TSC (186 KB) - TINA-TI Reference Design
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Simulation model

LM3102 TINA-TI Load Transient Reference Design

SNVM070.TSC (185 KB) - TINA-TI Reference Design
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Simulation model

LM3102 TINA-TI Startup Transient Reference Design

SNVM071.TSC (211 KB) - TINA-TI Reference Design
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Simulation model

LM3102 TINA-TI Steady Transient Reference Design

SNVM069.TSC (209 KB) - TINA-TI Reference Design
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Simulation model

LM3102 TINA-TI Transient Spice Model

SNVM067.ZIP (17 KB) - TINA-TI Spice Model
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Simulation model

LM3102 Unencrypted PSpice Transient Model

SNVM920.ZIP (3 KB) - PSpice Model
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Package Pins CAD symbols, footprints & 3D models
DSBGA (YPA) 28 Ultra Librarian
HTSSOP (PWP) 20 Ultra Librarian
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