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LM5118

ACTIVE

3-75V Wide Vin, Current Mode Non-Synchronous Buck-Boost Controller

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Data sheet

LM5118

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck-Boost Vin (max) (V) 75 Vin (min) (V) 3 Vout (max) (V) 70 Vout (min) (V) 1.23 Features Enable, Frequency synchronization, Nonsynchronous rectification Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 4500 Duty cycle (max) (%) 98
Rating Catalog Topology Buck-Boost Vin (max) (V) 75 Vin (min) (V) 3 Vout (max) (V) 70 Vout (min) (V) 1.23 Features Enable, Frequency synchronization, Nonsynchronous rectification Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 4500 Duty cycle (max) (%) 98
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • Ultra-Wide Input Voltage Range From 3 V to 75 V
  • Emulated Peak Current Mode Control
  • Smooth Transition Between Step-Down and Step-Up Modes
  • Switching Frequency Programmable to 500 KHz
  • Oscillator Synchronization Capability
  • Internal High Voltage Bias Regulator
  • Integrated High and Low-Side Gate Drivers
  • Programmable Soft-Start Time
  • Ultra-Low Shutdown Current
  • Enable Input Wide Bandwidth Error Amplifier
  • 1.5% Feedback Reference Accuracy
  • Thermal Shutdown
  • Package: 20-Pin HTSSOP (Exposed Pad)
  • Create a Custom Design Using the LM5118 With the WEBENCH® Power Designer
  • Ultra-Wide Input Voltage Range From 3 V to 75 V
  • Emulated Peak Current Mode Control
  • Smooth Transition Between Step-Down and Step-Up Modes
  • Switching Frequency Programmable to 500 KHz
  • Oscillator Synchronization Capability
  • Internal High Voltage Bias Regulator
  • Integrated High and Low-Side Gate Drivers
  • Programmable Soft-Start Time
  • Ultra-Low Shutdown Current
  • Enable Input Wide Bandwidth Error Amplifier
  • 1.5% Feedback Reference Accuracy
  • Thermal Shutdown
  • Package: 20-Pin HTSSOP (Exposed Pad)
  • Create a Custom Design Using the LM5118 With the WEBENCH® Power Designer

The LM5118 wide voltage range Buck-Boost switching regulator controller features all of the functions necessary to implement a high-performance, cost-efficient Buck-Boost regulator using a minimum of external components. The Buck-Boost topology maintains output voltage regulation when the input voltage is either less than or greater than the output voltage, making it especially suitable for automotive applications. The LM5118 operates as a buck regulator while the input voltage is sufficiently greater than the regulated output voltage and gradually transitions to the buck-boost mode as the input voltage approaches the output. This dual-mode approach maintains regulation over a wide range of input voltages with optimal conversion efficiency in the buck mode and a glitch-free output during mode transitions. This easy-to-use controller includes drivers for the high-side buck MOSFET and the low-side boost MOSFET. The regulators control method is based upon current mode control using an emulated current ramp. Emulated current mode control reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of the very small duty cycles necessary in high input voltage applications. Additional protection features include current limit, thermal shutdown and an enable input. The device is available in a power-enhanced, 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

The LM5118 wide voltage range Buck-Boost switching regulator controller features all of the functions necessary to implement a high-performance, cost-efficient Buck-Boost regulator using a minimum of external components. The Buck-Boost topology maintains output voltage regulation when the input voltage is either less than or greater than the output voltage, making it especially suitable for automotive applications. The LM5118 operates as a buck regulator while the input voltage is sufficiently greater than the regulated output voltage and gradually transitions to the buck-boost mode as the input voltage approaches the output. This dual-mode approach maintains regulation over a wide range of input voltages with optimal conversion efficiency in the buck mode and a glitch-free output during mode transitions. This easy-to-use controller includes drivers for the high-side buck MOSFET and the low-side boost MOSFET. The regulators control method is based upon current mode control using an emulated current ramp. Emulated current mode control reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of the very small duty cycles necessary in high input voltage applications. Additional protection features include current limit, thermal shutdown and an enable input. The device is available in a power-enhanced, 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

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Technical documentation

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Type Title Date
* Data sheet LM5118 Wide Voltage Range Buck-Boost Controller datasheet (Rev. J) PDF | HTML 30 Jun 2017
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
Technical article Learn how to keep your car battery steady and running longer PDF | HTML 28 Mar 2017
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
Application note Maintaining Output Voltage Regulation During Automotive Cold-Crank with LM5118 27 Jul 2015
White paper Wide VIN power management ICs simplify white paper (Rev. A) 19 Sep 2013
User guide AN-2178 LM5118 Four Switch Conversion (Rev. E) 06 May 2013

Design & development

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

Evaluation board

LM5118EVAL — Evaluation Board for the LM5118 Wide Vin Buck-Boost Controller

The LM5118 evaluation board is designed to provide the design engineer with a fully functional, Emulated Current Mode Control, buck-boost power converter to evaluate the LM5118 controller IC. The evaluation board provides a 12V output with 3A of output current capability. The evaluation board's (...)

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

PMLKBUCKBOOSTEVM — TI-PMLK Buck-Boost Experiment Board using LM5118

The BuckBoost Experiments Board is one board as part of the Texas Instruments Power Management Lab Kit (TI-PMLK) Series.  The BuckBoost Experiments Board uses the LM5118 IC.  The BuckBoost Experiments Board has an accompanying book that steps individuals through several experiments to (...)

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

PMLKBUCKBOOSTEVMB — TI-PMLK Buck-Boost Experiment Board using LM5118 with TI-PMLK Buck-Boost Experiment Book

The BuckBoost Experiments Board is one board as part of the Texas Instruments Power Management Lab Kit (TI-PMLK) Series.  The BuckBoost Experiments Board uses the LM5118 IC.  The box that is shipped will contain the TI-PMLKBUCKBOOSTEVM Hardware along with a bound version of the BuckBoost (...)

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

LM5118 PSpice Transient Model (Rev. B)

SNVM214B.ZIP (79 KB) - PSpice Model
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Simulation model

LM5118 TINA-TI Transient Reference Design

SNVM604.ZIP (558 KB) - TINA-TI Reference Design
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Simulation model

LM5118 Unencrypted PSpice Transient Model

SNVMAJ8.ZIP (4 KB) - PSpice Model
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Calculation tool

LM5118QUICK-CALC — LM5118/LM25118 Quick Start Component Calculator

Quick Start Component Calculator for LM5118/LM25118 devices
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
  • LM25118 — 3-42V Wide Vin, Current Mode Non-Synchronous Buck-Boost Controller
  • LM25118-Q1 — 3-42-V wide VIN, current mode non-synchronous buck-boost controller, AEC-Q100 qualified
  • LM5118 — 3-75V Wide Vin, Current Mode Non-Synchronous Buck-Boost Controller
  • LM5118-Q1 — 3-V to 75-V wide VIN, current mode non-synchronous buck-boost controller
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Reference designs

TIDA-01040 — Battery Tester Reference Design for High Current Applications

Li-Ion battery formation and electrical testing require accurate voltage and current control, usually to better than ±0.05% over the specified temperature range.  This reference design proposes a solution for high-current (up to 50 A) battery tester applications supporting input (bus) (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01041 — Battery tester reference design for multi-phase high-precision 0.5 to 100 A battery formation

This reference design provides a multi-phase solution for a wide range of current battery test applications. Leveraging the dual phase buck/boost controller LM5170's daisy chain configuration gives the design the ability to achieve 100A charging/discharging rates. Utilizing high accuracy constant (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01042 — Modular battery tester reference design for 50-A, 100-A, and 200-A applications

This reference design provides a modular battery test solution allowing users to have the flexibility to test batteries at different current levels with one design. This design leverages the TIDA-01041 reference design by providing two 100-A battery testers that can work independently or be (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP30833 — 30-W two-switch buck-boost reference design with 24-V or 48-V output

This two-switch buck-boost reference design controlled by LM5118 steps up and steps down an input voltage range of 30-V to 60-V to either 24-V or 48-V output voltage. Jumper three at digital-to-analog converter (DAC) is used to decide 24 V or 48 V with jumper 48 VOUT and without 24 VOUT. For the (...)
Test report: PDF
Reference designs

PMP15035 — 1000-W, Bidirectional, 12-V to 12-V Converter Reference Design

This reference design is a dual-channel, bidirectional converter suitable for 12-V to 12-V, dual-battery system, automotive applications. This reference design has a wide input range (3 V to 40 V) and could give full load (1kW) in the input voltage from 9V to 18V by using two LM5170-Q1 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP10681 — 3-42 Vin, 5 V at 3 A Buck-Boost Optimized for Automotive Cold Crank Reference Design

This is a modified LM5118 2 switch buck-boost single inductor evaluation module (EVM) optimized to operate through automitive transients such as cold-crank. It is designed to provide 15W (5V, 3A) of output power with an input voltage range of 3V to 42V.
Test report: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 20 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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