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LM851772-Q1

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具有適用於 USB-PD 之 I²C 介面的車用、80V 四開關降壓升壓控制器

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LM851772-Q1

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產品詳細資料

Rating Automotive Topology Buck-Boost Vin (max) (V) 80 Vin (min) (V) 3.5 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 EMI features Frequency Dithering, Spread Spectrum Duty cycle (max) (%) 100 Iq (typ) (A) 0.000075 Operating temperature range (°C) -40 to 150
Rating Automotive Topology Buck-Boost Vin (max) (V) 80 Vin (min) (V) 3.5 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 EMI features Frequency Dithering, Spread Spectrum Duty cycle (max) (%) 100 Iq (typ) (A) 0.000075 Operating temperature range (°C) -40 to 150
VQFN (RHA) 40 36 mm² (6 mm × 6 mm)
  • Input range from 3.5V to 80V
    • Selectable input voltage operation threshold up to 58.5V in 0.5V steps
  • Dynamical Vo programming using I2C from:
    • 3.3V to 48V in 20mV monotonous steps
    • 3.3V up to 23V in 10mV monotonous steps
  • Peak current regulation control with small voltage transition ripple overall operating modes
  • Shut down quiescent current 3µA
  • Operating quiescent current 75µA
  • 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 undervoltage 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
  • Input range from 3.5V to 80V
    • Selectable input voltage operation threshold up to 58.5V in 0.5V steps
  • Dynamical Vo programming using I2C from:
    • 3.3V to 48V in 20mV monotonous steps
    • 3.3V up to 23V in 10mV monotonous steps
  • Peak current regulation control with small voltage transition ripple overall operating modes
  • Shut down quiescent current 3µA
  • Operating quiescent current 75µA
  • 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 undervoltage 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

The LM851772-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.

LM851772-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 LM851772-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.

LM851772-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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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 LM851772-Q1 80V VIN 4 Switch Buck-Boost Controller With I2C for USB-PD Sourcing datasheet PDF | HTML 2026/6/19
EVM User's guide LM851772-Q1 Buck-Boost Controller Evaluation Module for USB-PD (Rev. A) PDF | HTML 2026/7/29
應用說明 Layout Optimization of 4-Switch Buck-Boost Converters PDF | HTML 2023/9/5

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

LM251772Q1EVM-PD — LM251772-Q1 評估模組

LM251772Q1EVM-PD 展示使用 LM251772-Q1 的靈活高功率降壓升壓設計。評估模組設定為在 9V 至 36V 輸入電壓範圍內運作，且提供最高 5A 負載電流的穩壓 5V 至 48V 輸出。EVM 在切換頻率為 320kHz 下運作。大多數裝置設定皆可透過跨接器輕鬆調整或設定，例如：操作模式（PSM 或 fPWM）、偏壓電源和外部時鐘同步。
使用指南: PDF | HTML
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開發模組 (EVM) 的 GUI

LM851772-CONFIGURATON-GUI — LM851772 GUI for configuration via I2C

Graphical User Interface (GUI) to configure the LM851772 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
支援產品和硬體
計算工具

LM851772-QUICKSTART-CALC — LM851772 BuckBoost Quickstart Calculator Tool

LM851772 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 LM851772.
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VQFN (RHA) 40 Ultra Librarian
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