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LM51772-Q1

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Automotive, 55V 4-switch buck-boost controller with I2C interface

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Data sheet

LM51772-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Buck-Boost Vin (max) (V) 55 Vin (min) (V) 0 Vout (max) (V) 55 Vout (min) (V) 1 Features 1% accuracy, AEC Q100, Adjustable current limit, Adjustable soft start, Adjustable switching frequency, Advanced power saving, 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 150 Iq (typ) (µA) 60 Duty cycle (max) (%) 100 TI functional safety category Functional Safety-Capable EMI features Frequency Dithering, Spread Spectrum
Rating Automotive Topology Buck-Boost Vin (max) (V) 55 Vin (min) (V) 0 Vout (max) (V) 55 Vout (min) (V) 1 Features 1% accuracy, AEC Q100, Adjustable current limit, Adjustable soft start, Adjustable switching frequency, Advanced power saving, 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 150 Iq (typ) (µA) 60 Duty cycle (max) (%) 100 TI functional safety category Functional Safety-Capable 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 steps
    • 1V up to 24V in 10mV steps
  • Peak current regulation control
  • Small voltage transition ripple overall operating modes
  • 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
  • Average input or output current sensor
    • Programmable from 0.5A (5mV) to 7A (70mV) in 50mA (500µV) steps
    • ISET pin selectable
  • I2C programmable with diagnostics
    • I2C usage is optional, alternative feature selection via CFG-Pins
  • Automotive temperature range (Tj = -40°C to 150°C)
  • 40-Pin WSON package with wettable flanks

  • Create a custom design using the LM51772-Q1 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 steps
    • 1V up to 24V in 10mV steps
  • Peak current regulation control
  • Small voltage transition ripple overall operating modes
  • 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
  • Average input or output current sensor
    • Programmable from 0.5A (5mV) to 7A (70mV) in 50mA (500µV) steps
    • ISET pin selectable
  • I2C programmable with diagnostics
    • I2C usage is optional, alternative feature selection via CFG-Pins
  • Automotive temperature range (Tj = -40°C to 150°C)
  • 40-Pin WSON package with wettable flanks

  • Create a custom design using the LM51772-Q1 with the WEBENCH® Power Designer

The LM51772-Q1 is a four switch Buck-Boost controller with optional I2C control. It provides a regulated output voltage if the input voltage is higher, equal or lower than the adjusted output voltage. In power safe mode the device supports very high efficiency at light and high load conditions and features a programmable pass-through function(PCM). The second over-voltage protection is user programmable and can be used to limit the voltage during moisture (test) conditions. Numerous monitoring features like a thermal warning help to maintain the system housekeeping.

LM51772-Q1 runs at a fixed switching frequency, which can be set via the RT/SYNC pin. The switching frequency remains the same during buck, boost and buck-boost operation. The device maintains small mode transition ripple overall operating modes. The integrated and optional high-side current sensor features an accurate output or input current limitation. The average current limit of the LM51772-Q1 is also configurable through the I2C interface.

The LM51772-Q1 is a four switch Buck-Boost controller with optional I2C control. It provides a regulated output voltage if the input voltage is higher, equal or lower than the adjusted output voltage. In power safe mode the device supports very high efficiency at light and high load conditions and features a programmable pass-through function(PCM). The second over-voltage protection is user programmable and can be used to limit the voltage during moisture (test) conditions. Numerous monitoring features like a thermal warning help to maintain the system housekeeping.

LM51772-Q1 runs at a fixed switching frequency, which can be set via the RT/SYNC pin. The switching frequency remains the same during buck, boost and buck-boost operation. The device maintains small mode transition ripple overall operating modes. The integrated and optional high-side current sensor features an accurate output or input current limitation. The average current limit of the LM51772-Q1 is also configurable through the I2C interface.
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Technical documentation

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Type Title Date
* Data sheet LM51772-Q1 55V 4-Switch Buck-Boost Controller with I2 C interface datasheet PDF | HTML 04 Jun 2025
Functional safety information LM51772-Q1 and LM251772-Q1 Functional Safety FIT Rate and FMD PDF | HTML 05 May 2025
EVM User's guide LM51772 Buck-Boost Controller Evaluation Module User's Guide (Rev. B) PDF | HTML 24 Jun 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
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
LM51772EVM-HP — LM51772 evaluation module
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
LM51772EVM-HP — LM51772 evaluation module
Download
Package Pins CAD symbols, footprints & 3D models
VQFN (RHA) 40 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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