LM5118

ACTIVE

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

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Product details

Parameters

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 open-in-new Find other Buck-boost & inverting controllers (external switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Buck-boost & inverting controllers (external switch)

Features

  • 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

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Description

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

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

Hardware development

EVALUATION BOARD Download
75
Description

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 wide (...)

EVALUATION BOARD Download
89
Description

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 (...)

Features
  • Expanding the BuckBoost topology knowledge using the LM5118
  • The BuckBoost board is configurable with jumpers for different exercises
  • The BuckBoost Board is accompanied by a downloadable BuckBoost Experiments Book
EVALUATION BOARD Download
99
Description

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 (...)

Features
  • Expanding the BuckBoost topology knowledge using the LM5118
  • The BuckBoost board is configurable with jumpers for different exercises
  • The BuckBoost Board is accompanied by a bound version of the BuckBoost Experiments Book

Design tools & simulation

SIMULATION MODEL Download
SNVM214B.ZIP (79 KB) - PSpice Model
SIMULATION MODEL Download
SNVM604.ZIP (558 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SNVMAJ8.ZIP (4 KB) - PSpice Model
SIMULATION TOOL Download
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
  • (...)
CALCULATION TOOL Download
CALCULATION TOOL Download
SNVU065A.ZIP (199 KB)

Reference designs

Many TI reference designs include the LM5118 Use our reference design selection tool to review and identify designs that best match your application and parameters.

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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