LM5118-Q1

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Automotive Grade 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 Automotive 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

  • AEC-Q100 Qualified for Automotive Applications
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • 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-Q1 With the WEBENCH® Power Designer

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Description

The LM5118-Q1 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-Q1 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

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet LM5118-Q1 Wide Voltage Range Buck-Boost Controller datasheet Sep. 14, 2017
White papers Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) Apr. 10, 2019
Technical articles Four-switch buck-boost layout tip No. 4: routing gate-drive and return paths Feb. 20, 2019
Application notes Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics Jul. 21, 2016
User guides AN-1819 LM5118 Evaluation Board (Rev. B) Jan. 17, 2014
User guides AN-2178 LM5118 Four Switch Conversion (Rev. E) May 06, 2013

Design & development

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Hardware development

EVALUATION BOARDS Download
document-generic User guide
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 (...)

Design tools & simulation

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

Reference designs

REFERENCE DESIGNS Download
Automotive Wide Vin Front-End Power Reference Design w/Cold Crank Operation & Transient Protection
TIDA-01179 The TIDA-01179 reference design is an automotive front-end power supply that is able to supply 30W maximum output for the 12V car battery. The first stage is a buck-boost DC/DC converter that maintains a stable 15V output voltage over the full DC range of the 12V battery conditions specified in ISO (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 20 View options

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