3-42-V wide VIN, current mode non-synchronous buck-boost controller, AEC-Q100 qualified


Product details


Topology Buck-Boost Vin (Min) (V) 3 Vin (Max) (V) 42 Vout (Max) (V) 38 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)


  • 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
  • Input Voltage Operating Range From 3 V to 42 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 LM25118-Q1 With the WEBENCH® Power Designer

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


The LM25118-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 LM25118 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 control method of the regulator 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.

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

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM25118-Q1 Wide Voltage Range Buck-Boost Controller datasheet Jun. 30, 2017
White paper 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 note Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics Jul. 21, 2016
User guide LM25118 Evaluation Board (Rev. B) Jan. 17, 2014

Design & development

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

Hardware development

document-generic User guide

The LM25118 Evaluation Board is designed to provide the design engineer with a fully functional, Emulated Current Mode Control, buck boost power converter to evaluate the LM25118 controller IC. The evaluation board provides a 12V output with 3A of output current capability. The evaluation board’s (...)

Design tools & simulation

SNVM212A.ZIP (74 KB) - PSpice Model
SNVM500.ZIP (28 KB) - TINA-TI Spice Model
SNVM501.TSC (174 KB) - TINA-TI Reference Design
SNVM502.TSC (152 KB) - TINA-TI Reference Design
SNVMAJ9.ZIP (4 KB) - PSpice Model
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 (...)
  • 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
  • (...)
SNVU065A.ZIP (199 KB)

Reference designs

20-W, 2-switch buck boost reference design with variable output voltage
PMP30520 — This reference design uses the LM25118-Q1. The input voltage is between 9 V and 16 V (withstanding pulse to 32 V). The output voltage is variable from 2 V to 18 V by means of a DAC control input. If the DAC control input is left open, the output voltage is about 13.26 V. With shorted DAC control (...)
document-generic Schematic document-generic User guide
Automotive Buck-Boost Reference Design
PMP11773 — This reference design is an automotive buck-boost converter providing a stable output voltage of 11.5V @ 1.0A on an input voltage range of 4.5 .. 28V DC.
document-generic Schematic document-generic User guide

CAD/CAE symbols

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HTSSOP (PWP) 20 View options

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