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


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

Package | Pins | Size

HTSSOP (PWP) 28 43 mm² 9.7 x 4.4 VQFN (RHF) 28 20 mm² 5 x 4 open-in-new Find other Buck-boost & inverting controllers (external switch)


  • 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
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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. C) Jun. 11, 2020
Functional safety information LM5176 and LM5176-Q1 Functional Safety, FIT Rate, Failure FMD May 22, 2020
Technical article Adjusting VOUT in USB Type-C™ and wireless charging applications, part 2 Feb. 18, 2020
Technical article Adjusting VOUT in USB Type-C™ and wireless charging applications, part 1 Feb. 10, 2020
Technical article Four-switch buck-boost layout tip No. 4: routing gate-drive and return paths Feb. 20, 2019
Application note A Method to Improve LM5176 Overcurrent Protection Feature Aug. 08, 2018
Application note LM5176 Power Sharing Between Two Parallel, Four-Switch Buck-Boost Converters Jul. 16, 2018
White paper An overview of radiated EMI specifications for power supplies Jun. 05, 2018
White paper An overview of conducted EMI specifications for power supplies Feb. 01, 2018
User guide LM5176 Wide-VIN Buck-Boost Controller EVM May 02, 2017

Design & development

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Hardware development

document-generic User guide
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.
  • High power design
  • Wide input voltage range of 6V-36V
  • High efficiency, synchronous buck-boost conversion
  • 250 kHz switching frequency
  • Flexible design using standard 5mm x 6mm FETs

Design tools & simulation

SNVMBA4B.ZIP (147 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
  • (...)
SNVC208.ZIP (3362 KB)

Reference designs

Battery back-up switch, charger and monitor reference design
PMP22125 — 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-generic Schematic document-generic User guide
Variable voltage power converter 5-35-V 300-W peak reference design for automotive audio amplifiers
PMP21697 — 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-generic Schematic document-generic User guide
High efficient 32-V / 3-A synchronous 4-switch buck-boost reference design
PMP30549 — 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-generic Schematic document-generic User guide
300W 12Vout 4-Switch Buck-Boost for Industrial PC Reference Design
PMP21278 — 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 is (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 28 View options
VQFN (RHF) 28 View options

Ordering & quality

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