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LM51772

ACTIVE

55V wide VIN four-switch buck-boost controller with I2C interface

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Data sheet

LM51772

ACTIVE
Data sheet Order now

Product details

Rating Catalog Topology Buck-Boost Vin (max) (V) 55 Vin (min) (V) 3.5 Vout (max) (V) 55 Vout (min) (V) 3.3 Features Adjustable current limit, Dynamic voltage scaling, Enable, Extended power range, Frequency synchronization, I2C, Light-load efficiency, Load Disconnect, Power good, Spread Spectrum, Synchronous rectification, Tracking, USB C/PD compatible, UVLO adjustable Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 60 Duty cycle (max) (%) 100 EMI features Frequency Dithering, Spread Spectrum
Rating Catalog Topology Buck-Boost Vin (max) (V) 55 Vin (min) (V) 3.5 Vout (max) (V) 55 Vout (min) (V) 3.3 Features Adjustable current limit, Dynamic voltage scaling, Enable, Extended power range, Frequency synchronization, I2C, Light-load efficiency, Load Disconnect, Power good, Spread Spectrum, Synchronous rectification, Tracking, USB C/PD compatible, UVLO adjustable Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 60 Duty cycle (max) (%) 100 EMI features Frequency Dithering, Spread Spectrum
VQFN (RHA) 40 36 mm² 6 x 6
  • Input range from 0V (V(BIAS) ≥ 3.5V) to 55V
  • Output voltage 1V to 55V
  • Dynamical Vo programming via I2C from:
    • 3.3V up to 48V in 20mV monotonous steps
    • 1V up to 24V in 10mV monotonous steps
  • Peak current regulation control
  • Small voltage transition ripple overall operating modes
  • Dynamic output voltage tracking (digital PWM tracking input, analog tracking input)
    • Via I2C interface programming
  • Shut down quiescent current 3µA
  • Operating quiescent current 60µA
  • DRV pin for external FET control
  • Operation mode selection for high efficiency in light load and high load conditions:
    • Power save mode (Single Pulse/µSleep)
    • Automatic/programmable conduction mode
  • Integrated high voltage supply LDO
  • Auxiliary high voltage LDO/reference
  • Integrated full-bridge gate drive
    • 2A peak current capability
    • Bootstrap over and under-voltage protection
    • Integrated boot-strap diode
  • Fixed frequency independent from operating mode (boost, buck-boost, buck)
    • Forced PWM mode selectable
    • Switching frequency from 100kHz to 2.2MHz
    • External clock synchronization and clock output
  • Spread spectrum operation selectable
  • Average input or output current sensor
    • Programmable from 0.5A (5mV) to 7A (70mV) in 50mA (500µV) steps
    • ISET pin selectable
  • I2C Interface readout of monitoring features

  • Create a custom design using the LM51772 with the WEBENCH® Power Designer
  • Input range from 0V (V(BIAS) ≥ 3.5V) to 55V
  • Output voltage 1V to 55V
  • Dynamical Vo programming via I2C from:
    • 3.3V up to 48V in 20mV monotonous steps
    • 1V up to 24V in 10mV monotonous steps
  • Peak current regulation control
  • Small voltage transition ripple overall operating modes
  • Dynamic output voltage tracking (digital PWM tracking input, analog tracking input)
    • Via I2C interface programming
  • Shut down quiescent current 3µA
  • Operating quiescent current 60µA
  • DRV pin for external FET control
  • Operation mode selection for high efficiency in light load and high load conditions:
    • Power save mode (Single Pulse/µSleep)
    • Automatic/programmable conduction mode
  • Integrated high voltage supply LDO
  • Auxiliary high voltage LDO/reference
  • Integrated full-bridge gate drive
    • 2A peak current capability
    • Bootstrap over and under-voltage protection
    • Integrated boot-strap diode
  • Fixed frequency independent from operating mode (boost, buck-boost, buck)
    • Forced PWM mode selectable
    • Switching frequency from 100kHz to 2.2MHz
    • External clock synchronization and clock output
  • Spread spectrum operation selectable
  • Average input or output current sensor
    • Programmable from 0.5A (5mV) to 7A (70mV) in 50mA (500µV) steps
    • ISET pin selectable
  • I2C Interface readout of monitoring features

  • Create a custom design using the LM51772 with the WEBENCH® Power Designer

The LM51772 is a four switch buck-boost controller that provides a regulated output voltage if the input voltage is higher, equal, or lower than the adjusted output voltage. In power save mode, the device supports very high efficiency over the complete operation range of the output. The LM51772 runs at a fixed switching frequency, which can be set via the RT/SYNC pin. The switching frequency remains constant during buck, boost and buck-boost operation in forced PWM. The external compensation pin allows very fast transient response for different applications. The device maintains small mode transition ripple overall operating modes. The output voltage and device configurations can be dynamically programmed via the integrated I2C interface. The integrated and optional high-side current sensor features an accurate output or input current limitation. The average current limit of the LM51772 is also configurable through the I2C interface.

The LM51772 is a four switch buck-boost controller that provides a regulated output voltage if the input voltage is higher, equal, or lower than the adjusted output voltage. In power save mode, the device supports very high efficiency over the complete operation range of the output. The LM51772 runs at a fixed switching frequency, which can be set via the RT/SYNC pin. The switching frequency remains constant during buck, boost and buck-boost operation in forced PWM. The external compensation pin allows very fast transient response for different applications. The device maintains small mode transition ripple overall operating modes. The output voltage and device configurations can be dynamically programmed via the integrated I2C interface. The integrated and optional high-side current sensor features an accurate output or input current limitation. The average current limit of the LM51772 is also configurable through the I2C interface.
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Technical documentation

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Type Title Date
* Data sheet LM51772 55V 4-Switch Buck-Boost Controller with I2 C interface datasheet (Rev. D) PDF | HTML 03 Sep 2025
Application brief Using the DRV1 Pin on LM51772 and LM251772 PDF | HTML 29 Jul 2025
Application note Battery or Capacitor Backup Operation with the LM51772 09 Jul 2025
Application brief Current Monitoring with Positive and Negative Currents on LM5177x Devices (Rev. A) PDF | HTML 25 Nov 2024
Application note Parallel Operation of the Buck-Boost Converters Using LM51772 Buck-Boost Controller PDF | HTML 27 Aug 2024
Application note Layout Optimization of 4-Switch Buck-Boost Converters PDF | HTML 05 Sep 2023

Design & development

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

Evaluation board

LM51772EVM-HP — LM51772 evaluation module

The LM51772EVM-HP demonstrates a flexible high-power buck-boost design using the LM51772 wide-VIN buck-boost controller. The evaluation module is configured to operate with an input voltage range from 9V to 48V and provides a regulated 20V output with up to 5A of load current.

User guide: PDF | HTML
Not available on TI.com
Evaluation board

USB2ANY — USB2ANY interface adapter

The USB2ANY interface adapter is a tool intended to allow a computer to control an evaluation module (EVM) via a USB connection. USB2ANY supports multiple popular protocol interfaces and provides 3.3-V and 5-V power supplies.

User guide: PDF
Not available on TI.com
GUI for evaluation module (EVM)

LM51772-CONFIGURATON-GUI — LM51772 GUI for configuration via I2C

Graphical User Interface (GUI) to configure the LM51772 via I2C. You can use the Launch button for using the GUI online via a browser or one of the download files to operate the GUI offline
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
  • LM51772 — 55V wide VIN four-switch buck-boost controller with I2C interface
  • LM51772-Q1 — Automotive, 55V 4-switch buck-boost controller with I2C interface
Hardware development
Evaluation board
Launch Download options
Calculation tool

LM51772-QUICKSTART-CALC — LM51772 BuckBoost Quickstart Calculator Tool

LM51772 BuckBoost Quickstart Calculator Tool. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck-boost converter based on the LM51772.
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
  • LM51772 — 55V wide VIN four-switch buck-boost controller with I2C interface
  • LM51772-Q1 — Automotive, 55V 4-switch buck-boost controller with I2C interface
Hardware development
Evaluation board
Download
Gerber file

LM51772EVM-HP PCB Layout

SLVME54.ZIP (2229 KB)
Download
Package Pins CAD symbols, footprints & 3D models
VQFN (RHA) 40 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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Information included:
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  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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