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Buck-boost & inverting regulators
Buck-boost & inverting controllers (external switch)

LM5176

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55V wide VIN synchronous 4-switch buck-boost controller

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Data sheet

LM5176

ACTIVE
Data sheet Order now

Product details

Topology Buck-Boost Vin (Min) (V) 4.2 Vin (Max) (V) 55 Vout (Max) (V) 55 Vout (Min) (V) 0.8 Duty cycle (Max) (%) 100 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 600 Iq (Typ) (mA) 2 Features Adjustable Current Limit, Enable, Frequency Synchronization, Power Good, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 125 Rating Catalog
Topology Buck-Boost Vin (Min) (V) 4.2 Vin (Max) (V) 55 Vout (Max) (V) 55 Vout (Min) (V) 0.8 Duty cycle (Max) (%) 100 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 600 Iq (Typ) (mA) 2 Features Adjustable Current Limit, Enable, Frequency Synchronization, Power Good, Pre-Bias Start-Up, Synchronous Rectification, UVLO Adjustable Operating temperature range (C) -40 to 125 Rating Catalog
HTSSOP (PWP) 28 43 mm² 9.7 x 4.4 VQFN (RHF) 28 20 mm² 5 x 4
  • Functional Safety-Capable
  • Single inductor buck-boost controller for step-up/step-down DC/DC conversion
  • Wide VIN: 4.2 V (2.5 V with bias) to 55 V (60 V maximum)
  • Flexible VOUT: 0.8 V to 55 V
  • VOUT short protection
  • High efficiency buck-boost transition
  • Adjustable switching frequency
  • Optional frequency sync and dithering
  • Integrated 2-A MOSFET gate drivers
  • Cycle-by-cycle current limit and optional hiccup
  • Optional input or output average current limiting
  • Programmable input UVLO and soft start
  • Power Good and output overvoltage protection
  • Available in HTSSOP-28 and QFN-28 packages
  • Create a custom design using the LM5176 with the WEBENCH Power Designer
  • Functional Safety-Capable
  • Single inductor buck-boost controller for step-up/step-down DC/DC conversion
  • Wide VIN: 4.2 V (2.5 V with bias) to 55 V (60 V maximum)
  • Flexible VOUT: 0.8 V to 55 V
  • VOUT short protection
  • High efficiency buck-boost transition
  • Adjustable switching frequency
  • Optional frequency sync and dithering
  • Integrated 2-A MOSFET gate drivers
  • Cycle-by-cycle current limit and optional hiccup
  • Optional input or output average current limiting
  • Programmable input UVLO and soft start
  • Power Good and output overvoltage protection
  • Available in HTSSOP-28 and QFN-28 packages
  • Create a custom design using the LM5176 with the WEBENCH Power Designer

The LM5176 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM5176 operates over a wide input voltage range of 4.2 V to 55 V (60-V absolute maximum) to support a variety of applications.

The LM5176 uses current-mode control both in buck and boost modes of operation for superior load and line regulation. The switching frequency is programmed by an external resistor and can be synchronized to an external clock signal.

The device also features a programmable soft-start function and offers protection features including cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. In addition, the LM5176 features optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.

The LM5176 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM5176 operates over a wide input voltage range of 4.2 V to 55 V (60-V absolute maximum) to support a variety of applications.

The LM5176 uses current-mode control both in buck and boost modes of operation for superior load and line regulation. The switching frequency is programmed by an external resistor and can be synchronized to an external clock signal.

The device also features a programmable soft-start function and offers protection features including cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. In addition, the LM5176 features optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.
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Technical documentation

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Type Title Date
* Data sheet LM5176 55-V Wide VIN Synchronous 4-switch Buck-boost Controller datasheet (Rev. D) 10 Aug 2021
E-book An Engineer’s Guide to Low EMI in DC/DC Regulators 21 Apr 2021
Functional safety information LM5176 and LM5176-Q1 Functional Safety, FIT Rate, Failure FMD 22 May 2020
Technical article Adjusting VOUT in USB Type-C™ and wireless charging applications, part 2 18 Feb 2020
Technical article Adjusting VOUT in USB Type-C™ and wireless charging applications, part 1 10 Feb 2020
Technical article Four-switch buck-boost layout tip No. 4: routing gate-drive and return paths 20 Feb 2019
Application note A Method to Improve LM5176 Overcurrent Protection Feature 08 Aug 2018
Application note LM5176 Power Sharing Between Two Parallel, Four-Switch Buck-Boost Converters 16 Jul 2018
White paper An overview of radiated EMI specifications for power supplies 05 Jun 2018
White paper An overview of conducted EMI specifications for power supplies 01 Feb 2018
User guide LM5176 Wide-VIN Buck-Boost Controller EVM 02 May 2017

Design & development

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

Evaluation board

LM5176EVM-HP — LM5176 Wide-VIN Buck-Boost Controller Evaluation Module

The LM5176EVM-HP demonstrates a flexible high power buck-boost design using the LM5176 wide-vin buck-boost controller. The evaluation module is configured to operate from an input voltage range of 6V-36V and to provide a regulated 12-V output with up to 12A of load current.
document-pdfAcrobat User guide
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Simulation model

LM5176 PSpice Transient Model (Rev. B)

SNVMBA4B.ZIP (147 KB) - PSpice Model
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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 (...)
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Calculation tool

LM5176 Design Calculator

SNVC208.ZIP (3362 KB)
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Reference designs

PMP22125 — Battery back-up switch, charger and monitor reference design

A complete battery back-up, charger and monitoring is implemented with this reference design.  It includes switching between a 12/24-Vdc source and 12/24-V lead acid battery, constant current battery charging at 1A typical, battery maintenance float charge and monitoring circuits for the (...)
document-pdfAcrobat Schematic
Reference designs

PMP21697 — Variable voltage power converter 5-35-V 300-W peak reference design for automotive audio amplifiers

This reference design provides a variable output power for audio amplifiers from 5 V to 35 V controllable by a Pulse Width Modulator signal. The output power capability of 75 W RMS and 300 W peak is suitable for high power automotive audio amplifiers. Conversion is 4-switch Buck-Boost for greater (...)
document-pdfAcrobat Schematic
Reference designs

PMP30549 — High efficient 32-V / 3-A synchronous 4-switch buck-boost reference design

This telecom reference design features a highly effective 100-W, 4-switch buck-boost. The converter allows to drive a 32-V RF LDMOS out of a wide input range 17 V to 57 V with peak efficiency 98% plus. An input filter is implemented to reduce conducted emissions to source. Additionally, a spread (...)
document-pdfAcrobat Schematic
Reference designs

PMP21278 — 300W 12Vout 4-Switch Buck-Boost for Industrial PC Reference Design

The PMP21278 reference design is a 300W power supply utilizing the LM5176 4-switch buck-boost controller for industrial applications. This design can operate from 9V to 50V. The design has a 12V output and capable of sourcing 25A continuous current. Switching frequency is set to 230kHz. PMP21278 (...)
document-pdfAcrobat Schematic
Package Pins Download
HTSSOP (PWP) 28 View options
VQFN (RHF) 28 View options

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