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LM51772

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

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Data sheet

LM51772

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Data sheet Order now

Product details

Topology Buck-Boost Vin (min) (V) 3.5 Vin (max) (V) 55 Vout (max) (V) 55 Vout (min) (V) 3.3 Duty cycle (max) (%) 100 Switching frequency (min) (kHz) 90 Switching frequency (max) (kHz) 2200 Iq (typ) (mA) 0.06 Features Adjustable UVLO, Adjustable current limit, Dynamic Voltage Scaling, Enable, 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 Rating Catalog Type Controller
Topology Buck-Boost Vin (min) (V) 3.5 Vin (max) (V) 55 Vout (max) (V) 55 Vout (min) (V) 3.3 Duty cycle (max) (%) 100 Switching frequency (min) (kHz) 90 Switching frequency (max) (kHz) 2200 Iq (typ) (mA) 0.06 Features Adjustable UVLO, Adjustable current limit, Dynamic Voltage Scaling, Enable, 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 Rating Catalog Type Controller
VQFN (RHA) 40 36 mm² 6 x 6
  • Input range from 3.5 V to 55 V (absolute maximum. 57 V)
  • Output voltage 3.3 V to 48 V
  • Dynamical V o programming via I 2C from 3.3 V
    • up to 48 V in 20-mV monotonous steps
    • up to 24 V in 10-mV monotonous steps
  • Peak current regulation scheme
  • Small voltage transition ripple over all operating modes
  • Dynamic output voltage tracking (digital PWM tracking input, analog tracking input)
    • Via I 2C interface programming
  • Shut down quiescent current 3 µA
  • Operating quiescent current 60 µA
  • DRV pin for external FET control
  • Operation mode selection for high efficiency in light load and high load conditions:
    • Power save mode (burst/µSleep)
    • Automatic/programmable conduction mode
  • Integrated high voltage supply LDO
  • Axillary high voltage LDO/reference
  • Integrated full-bridge gate drive
    • 2-A 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 100 kHz to 2.2 MHz
    • External clock synchronization and clock output
  • Spread spectrum operation selectable
  • High-side output current sensor
    • Programmable from 1 A to 7 A in 50-mA steps
    • ISET pin selectable
  • I 2C Interface readout of (device configuration, enhanced monitoring features, programmable thermal warning)

  • Create a custom design using the LM51772 with the WEBENCH ® Power Designer
  • Input range from 3.5 V to 55 V (absolute maximum. 57 V)
  • Output voltage 3.3 V to 48 V
  • Dynamical V o programming via I 2C from 3.3 V
    • up to 48 V in 20-mV monotonous steps
    • up to 24 V in 10-mV monotonous steps
  • Peak current regulation scheme
  • Small voltage transition ripple over all operating modes
  • Dynamic output voltage tracking (digital PWM tracking input, analog tracking input)
    • Via I 2C interface programming
  • Shut down quiescent current 3 µA
  • Operating quiescent current 60 µA
  • DRV pin for external FET control
  • Operation mode selection for high efficiency in light load and high load conditions:
    • Power save mode (burst/µSleep)
    • Automatic/programmable conduction mode
  • Integrated high voltage supply LDO
  • Axillary high voltage LDO/reference
  • Integrated full-bridge gate drive
    • 2-A 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 100 kHz to 2.2 MHz
    • External clock synchronization and clock output
  • Spread spectrum operation selectable
  • High-side output current sensor
    • Programmable from 1 A to 7 A in 50-mA steps
    • ISET pin selectable
  • I 2C Interface readout of (device configuration, enhanced monitoring features, programmable thermal warning)

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

The LM51772 is a four switch Buck-Boost controller. It 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 the constant during buck, boost and buck-boost operation in forced PWM. The external compensation pin allows very fast transient responds for different applications.(Continued)

The LM51772 is a four switch Buck-Boost controller. It 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 the constant during buck, boost and buck-boost operation in forced PWM. The external compensation pin allows very fast transient responds for different applications.(Continued)
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Technical documentation

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* Data sheet LM5177248-V 4 Switch Buck-Boost Controller with I2C interface datasheet PDF | HTML 03 Oct 2023
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 for wide-VIN, high-power buck-boost applications with I2C interface

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 9 V to 48 V and provides a regulated 20 V output with up to 5 A 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
Buck-boost & inverting controllers (external switch)
LM51772 — 55-V wide VIN four-switch buck-boost controller with I2C interface
Hardware development
LM51772EVM-HP — LM51772 evaluation module for wide-VIN, high-power buck-boost applications with I2C interface
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
Buck-boost & inverting controllers (external switch)
LM51772 — 55-V wide VIN four-switch buck-boost controller with I2C interface
Hardware development
Evaluation board
LM51772EVM-HP — LM51772 evaluation module for wide-VIN, high-power buck-boost applications with I2C interface
Download
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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Package Pins Download
VQFN (RHA) 40 View options
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