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LM5116

ACTIVE

6-100V Wide Vin, Current Mode Synchronous Buck Controller

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Data sheet

A newer version of this product is available

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Same functionality with different pin-out to the compared device
LM5146 ACTIVE 100-V synchronous buck DC/DC controller with wide duty-cycle range Smaller device footprint optimized for EMI requirements.

LM5116

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 6 Vin (max) (V) 100 Iout (max) (A) 20 Operating temperature range (°C) -40 to 150 Control mode current mode Topology Buck Rating Catalog Vout (min) (V) 1.215 Vout (max) (V) 80 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 4600 Duty cycle (max) (%) 98 Number of phases 1
Vin (min) (V) 6 Vin (max) (V) 100 Iout (max) (A) 20 Operating temperature range (°C) -40 to 150 Control mode current mode Topology Buck Rating Catalog Vout (min) (V) 1.215 Vout (max) (V) 80 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable Iq (typ) (µA) 4600 Duty cycle (max) (%) 98 Number of phases 1
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • New, similar products available:
    • LM5148 80-V synchronous buck controller with ultra-low IQ and DRSS
    • LM5149 80-V synchronous buck controller with ultra-low IQ and AEF
  • Emulated peak current mode
  • Wide operating range up to 100 V
  • Low I Q shutdown (< 10 µA)
  • Drives standard or logic level MOSFETs
  • Robust 3.5-A peak gate drive
  • Free-run or synchronous operation to 1 MHz
  • Optional diode emulation mode
  • Programmable output from 1.215 V to 80 V
  • Precision 1.5% voltage reference
  • Programmable current limit
  • Programmable soft start
  • Programmable line undervoltage lockout
  • Automatic switch to external bias supply
  • HTSSOP-20 exposed pad
  • Thermal shutdown
  • Create a custom design using the LM5116 with the WEBENCH Power Designer
  • New, similar products available:
    • LM5148 80-V synchronous buck controller with ultra-low IQ and DRSS
    • LM5149 80-V synchronous buck controller with ultra-low IQ and AEF
  • Emulated peak current mode
  • Wide operating range up to 100 V
  • Low I Q shutdown (< 10 µA)
  • Drives standard or logic level MOSFETs
  • Robust 3.5-A peak gate drive
  • Free-run or synchronous operation to 1 MHz
  • Optional diode emulation mode
  • Programmable output from 1.215 V to 80 V
  • Precision 1.5% voltage reference
  • Programmable current limit
  • Programmable soft start
  • Programmable line undervoltage lockout
  • Automatic switch to external bias supply
  • HTSSOP-20 exposed pad
  • Thermal shutdown
  • Create a custom design using the LM5116 with the WEBENCH Power Designer

The LM5116 is a synchronous buck controller intended for step-down regulator applications from a high-voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high-input voltage applications.

The operating frequency is programmable from 50 kHz to 1 MHz. The LM5116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation, for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current.

Additional features include a high-voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit, and adjustable line undervoltage lockout. The device is available in a power enhanced HTSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.

New products (LM5148 and LM5149) offer reduced BOM cost, higher efficiency, and reduced design size among many other features.

The LM5116 is a synchronous buck controller intended for step-down regulator applications from a high-voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high-input voltage applications.

The operating frequency is programmable from 50 kHz to 1 MHz. The LM5116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation, for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current.

Additional features include a high-voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit, and adjustable line undervoltage lockout. The device is available in a power enhanced HTSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.

New products (LM5148 and LM5149) offer reduced BOM cost, higher efficiency, and reduced design size among many other features.

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Technical documentation

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Type Title Date
* Data sheet LM5116 Wide Range Synchronous Buck Controller datasheet (Rev. I) PDF | HTML 03 Nov 2023
Analog Design Journal Control-Mode Quick Reference Guide (Rev. B) PDF | HTML 29 Aug 2023
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 03 Jul 2018
Selection guide DC/DC Buck Controller Solutions Selection Guide 06 Feb 2018
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
White paper Choosing the Right Fixed Frequency Buck Regulator Control Strategy 02 Oct 2015
White paper Choosing the Right Fixed Frequency Buck Regulator Control Strategy (PPT) 02 Oct 2015
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013
EVM User's guide AN-1596 LM5116 Evaluation Board (Rev. C) 24 Apr 2013
EVM User's guide AN-1713 LM5116-12 Evaluation Board (Rev. A) 24 Apr 2013
Application note Minimizing FET Losses For a High Input Rail Buck Converter (Rev. A) 23 Apr 2013

Design & development

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

Evaluation board

LM5116-12EVAL — LM5116-12 Evaluation Board

The LM5116-12 evaluation board is designed to provide the design engineer with a fully functional power converter based on Emulated Current Mode Control to evaluate the LM5116 controller IC. The evaluation board provides a 12V output with a 5A current capability. The operating input voltage ranges (...)

User guide: PDF
Not available on TI.com
Evaluation board

LM5116EVAL — LM5116 Wide Vin Synchronous Buck Controller Evaluation Module

LM5116 Wide Range Synchronous Buck Controller

User guide: PDF
Not available on TI.com
Simulation model

LM5116 PSpice Average Model

SNVM346.ZIP (53 KB) - PSpice Model
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Simulation model

LM5116 PSpice Transient Model (Rev. C)

SNVM345C.ZIP (101 KB) - PSpice Model
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Simulation model

LM5116 TINA-TI Transient Reference Design (Rev. B)

SNVM051B.TSC (159 KB) - TINA-TI Reference Design
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Simulation model

LM5116 TINA-TI Transient Spice Model (Rev. B)

SNVM052B.ZIP (15 KB) - TINA-TI Spice Model
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Simulation model

LM5116 Unencrypted PSpice Average Model

SNVM959.ZIP (2 KB) - PSpice Model
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Simulation model

LM5116 Unencrypted PSpice Transient Model (Rev. A)

SNVM958A.ZIP (6 KB) - PSpice Model
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Calculation tool

LM5116-5116WG-25116DESIGN-CALC — LM(2)5116/WG Quick Start Component Calculator

Welcome to the LM5116, LM5116WG and LM25116 Quickstart Design Tool. This standalone tool assists the power supply engineer with the design of a DC/DC buck regulator based on a synchronous buck controller from this product family. As such, the user can expeditiously arrive at an optimized design to (...)
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Reference designs

PMP11257 — Class 4 PoE Synchronous Buck Converter (12V/2A) Reference Design

The LM5116 synchronous buck controller provides a high efficiency solution for non-isolated PoE PD applications.  The TPS2378 PoE PD controller performs all necessary functions for an IEEE802.3at compliant Class 4 PoE PD.  This converter is ideal for any PoE application that demands best (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP9581_REVB — 40W Synchronous ZETA Converter with Coupled-Inductor Reference Design

This coupled-inductor, 13.2V at 4A, synchronous ZETA converter achieves greater than 95% efficiency at full load. It is capable of 5A out for Vin greater than 10V. It utilizes all surface mount components, maintains a low temperature rise and is capable of high peak load transients. See PMP9581 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP9581_REVC — 40W Synchronous ZETA Converter with Two Inductors Reference Design

This dual-inductor, 13.2V at 4A, synchronous ZETA converter achieves greater than 93% efficiency at full load. It is capable of 5A out for Vin greater than 10V. It utilizes all surface mount components, maintains a low temperature rise and is capable of high peak load transients.  See PMP9581 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP7282 — 35V to 60V Input and 600W Output Dual-phase Buck Converter with 97% Efficiency Reference Design

This 600W wide voltage input dual phase power converter uses two emulated current-mode controllers 180 degrees out of phase to minimize input and output ripple current. Compared to conventional isolated power converters, this synchronous buck architecture provides a reduced footprint and BOM cost (...)
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 20 Ultra Librarian
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