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 Catalog
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 Catalog
HTSSOP (PWP) 20 42 mm² 6.5 x 6.4
  • 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 With the WEBENCH® Power Designer
  • 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 With the WEBENCH® Power Designer

The LM25118 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.

The LM25118 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.

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Technical documentation

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Type Title Date
* Data sheet LM25118 Wide Voltage Range Buck-Boost Controller datasheet (Rev. F) 12 Mar 2018
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 10 Apr 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 21 Jul 2016
User guide LM25118 Evaluation Board (Rev. B) 17 Jan 2014

Design & development

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

Evaluation board

LM25118EVAL — Evaluation Board for the LM25118 Wide Vin Buck-Boost Controller

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 (...)

Simulation model

LM25118 PSpice Transient Model (Rev. A)

SNVM212A.ZIP (74 KB) - PSpice Model
Simulation model

LM25118 TINA-TI Transient Spice Model

SNVM500.ZIP (28 KB) - TINA-TI Spice Model
Simulation model

LM25118 TINA-TI Startup Transient Reference Design

SNVM501.TSC (174 KB) - TINA-TI Reference Design
Simulation model

LM25118 TINA-TI Load Transient Reference Design

SNVM502.TSC (152 KB) - TINA-TI Reference Design
Simulation model

LM25118 Unencrypted PSpice Transient Model

SNVMAJ9.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 (...)
Reference designs

PMP8637 — Synchronous Buck 3.3V @ 125mA Reference Design

This design is a buck-boost converter for automotive applications covering an input voltage range of 3.5 .. 35V. It provides an output voltage of 5.7V @ 1.2A.
Reference designs

PMP8570 — Two-switch buck-boost converter with 28.0V @ 2.5A and an input voltage range of 10..32V

This design is a two-switch buck boost converter which generates an output voltage of 28.0V @ 2.5A from an input voltage range of 10..32V.
Package Pins Download
HTSSOP (PWP) 20 View options

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