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LM251772-Q1

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Automotive, 36V, 4-switch buck-boost controller with I2C interface for USB-PD

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Data sheet

LM251772-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Buck-Boost Vin (max) (V) 36 Vin (min) (V) 3.5 Vout (max) (V) 36 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, Synchronous rectification, Tracking, USB C/PD compatible, UVLO adjustable EMI features Frequency Dithering, Spread Spectrum Duty cycle (max) (%) 100 Iq (typ) (A) 0.00006 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
Rating Automotive Topology Buck-Boost Vin (max) (V) 36 Vin (min) (V) 3.5 Vout (max) (V) 36 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, Synchronous rectification, Tracking, USB C/PD compatible, UVLO adjustable EMI features Frequency Dithering, Spread Spectrum Duty cycle (max) (%) 100 Iq (typ) (A) 0.00006 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
VQFN (RHA) 40 36 mm² 6 x 6
  • Input range from 3.5V to 36V
  • Dynamical Vo programming using I2C from:
    • 3.3V up to in 20mV monotonous steps
    • 1V up to 23V 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
  • Drive (DRV) pin for dual role port power path
    • Push-Pull output for fast pMOS FET control
    • Configurable as charge pump driver stage for nMOS FET
  • Operation mode selection for high efficiency in light load and high load conditions:
    • Power save mode (Single Pulse/µSleep)
    • Automatic conduction mode
  • Integrated high voltage supply LDO
  • Auxiliary high voltage LDO for microcontroller supply
  • 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 2200kHz
    • External clock synchronization and clock output
  • Spread spectrum operation selectable
  • Average input or output current sensor
    • Programmable from 0.5A to 7A in 50mA steps
  • I2C programmable with diagnostics
  • Automotive temperature range (Tj = -40°C to 150°C)
  • 40-Pin WSON package with wettable flanks
  • Functional Safety-Capable

  • Create a custom design using the LM251772-Q1 with the WEBENCH® Power Designer
  • Input range from 3.5V to 36V
  • Dynamical Vo programming using I2C from:
    • 3.3V up to in 20mV monotonous steps
    • 1V up to 23V 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
  • Drive (DRV) pin for dual role port power path
    • Push-Pull output for fast pMOS FET control
    • Configurable as charge pump driver stage for nMOS FET
  • Operation mode selection for high efficiency in light load and high load conditions:
    • Power save mode (Single Pulse/µSleep)
    • Automatic conduction mode
  • Integrated high voltage supply LDO
  • Auxiliary high voltage LDO for microcontroller supply
  • 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 2200kHz
    • External clock synchronization and clock output
  • Spread spectrum operation selectable
  • Average input or output current sensor
    • Programmable from 0.5A to 7A in 50mA steps
  • I2C programmable with diagnostics
  • Automotive temperature range (Tj = -40°C to 150°C)
  • 40-Pin WSON package with wettable flanks
  • Functional Safety-Capable

  • Create a custom design using the LM251772-Q1 with the WEBENCH® Power Designer

The LM251772-Q1 is a four switch Buck-Boost controller. The device 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 output voltage and average current is dynamically programmable using the integrated I2C interface. The configuration range for output voltage and average current meets the USB-PD standard requirements. The integrated DRV pin is used to control an optional disconnect FET if the system is targeted to support dual role port (DRP) requirements.

LM251772-Q1 runs at a fixed switching frequency, which is set using the RT/SYNC pin. The switching frequency remains the same during buck, boost and buck-boost operation. The device maintains small mode transition ripple over all operating modes.

The LM251772-Q1 is a four switch Buck-Boost controller. The device 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 output voltage and average current is dynamically programmable using the integrated I2C interface. The configuration range for output voltage and average current meets the USB-PD standard requirements. The integrated DRV pin is used to control an optional disconnect FET if the system is targeted to support dual role port (DRP) requirements.

LM251772-Q1 runs at a fixed switching frequency, which is set using the RT/SYNC pin. The switching frequency remains the same during buck, boost and buck-boost operation. The device maintains small mode transition ripple over all operating modes.
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Technical documentation

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Type Title Date
* Data sheet LM251772-Q1 36V VIN 4 Switch Buck-Boost Controller With I2C for datasheet PDF | HTML 27 Oct 2025
Functional safety information LM51772-Q1 and LM251772-Q1 Functional Safety FIT Rate and FMD PDF | HTML 05 May 2025

Design & development

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

Evaluation board

LM251772EVM-PD — LM251772 evaluation module

The LM251772EVM-PD demonstrates a flexible high-power buck-boost design using the LM251772. The evaluation module (EVM) is configured to operate from an input voltage range of 9V to 36V and to produce a regulated 5V to 48V output with up to a 5A load current. The EVM operates with a switching (...)
User guide: PDF | HTML
Not available on TI.com
GUI for evaluation module (EVM)

LM251772-CONFIGURATON-GUI — LM251772 GUI for configuration via I2C

Graphical User Interface (GUI) to configure the LM251772 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
DC/DC controllers
  • LM251772 — 36V-VIN four-switch buck-boost controller with I²C for USB-PD sourcing
  • LM251772-Q1 — Automotive, 36V, 4-switch buck-boost controller with I2C interface for USB-PD
Hardware development
Evaluation board
Launch Download options
Calculation tool

LM251772-QUICKSTART-CALC — LM251772 BuckBoost Quickstart Calculator Tool

LM251772 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 LM2521772.
Supported products & hardware

Supported products & hardware

Products
DC/DC controllers
  • LM251772 — 36V-VIN four-switch buck-boost controller with I²C for USB-PD sourcing
  • LM251772-Q1 — Automotive, 36V, 4-switch buck-boost controller with I2C interface for USB-PD
Hardware development
Evaluation board
Download
Reference designs

PMP31344 — Automotive, 12V input, 140W two-port USB Power Delivery with DisplayPort™ ALT mode reference design

This reference design represents an automotive USB Extended Power Range (EPR) system, providing both power and digital communication to two USB Type-C® ports. When connecting a USB-C cable, the TPS26744E-Q1 negotiates a target output voltage and maximum current with the plugged-in device. The (...)
Test report: PDF
Package Pins CAD symbols, footprints & 3D models
VQFN (RHA) 40 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
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  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

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