Product details

Topology Buck-Boost Vin (Min) (V) 3 Vin (Max) (V) 75 Vout (Max) (V) 70 Vout (Min) (V) 1.23 Duty cycle (Max) (%) 98 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 500 Iq (Typ) (mA) 4.5 Features Enable, Frequency Synchronization Iout (Max) (A) 10 Operating temperature range (C) -40 to 125 Rating Catalog
Topology Buck-Boost Vin (Min) (V) 3 Vin (Max) (V) 75 Vout (Max) (V) 70 Vout (Min) (V) 1.23 Duty cycle (Max) (%) 98 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 500 Iq (Typ) (mA) 4.5 Features Enable, Frequency Synchronization Iout (Max) (A) 10 Operating temperature range (C) -40 to 125 Rating Catalog
HTSSOP (PWP) 20 42 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

Design & development

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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 (...)

In stock
Limit: 5
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 (...)

In stock
Limit: 3
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 (...)

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Limit: 3
Simulation model

LM5118 PSpice Transient Model (Rev. B)

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

LM5118 TINA-TI Transient Reference Design

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

LM5118 Unencrypted PSpice Transient Model

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

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Calculation tool

LM5118QUICK-CALC — LM5118 Quick Start Component Calculator

Reference designs

TIDA-010086 — Digital control reference design for cost-optimized battery test systems

This reference design provides a cost-effective solution for battery formation and test applications. This design uses the C2000™ real-time control MCU for high-resolution pulse-width modulation (PWM) generation, and constant-current (CC) and constant-voltage (CV)
control loops. It efficiently (...)
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) (...)
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 (...)
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 (...)
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 (...)
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.
Reference designs

PMP7988 — 8Vin to 16Vin, 12Vout @ 6A Non-Sync Buck Boost Converter

PMP7988 is a non-sync buck boost converter. The design accepts an input voltage of 8Vin to 16Vin, with 12V nominal input and outputs 12V, capable of providing 6A of current to the load.
Reference designs

PMP9104 — 4-Switch Buck-Boost Delivers High Transient Power for Wireless Base Station Reference Design

This four switch buck-boost converter functions as both a buck or a boost, with a smooth transition between modes. It delivers a 28V (typical) output voltage at 2-3A continuous (4.5A peak) from a 22V-32V input.
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HTSSOP (PWP) 20 View options

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