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LM34938-Q1

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Automotive, 36V VIN, four-switch buck-boost controller with I²C and 2.2MHz FSW for wireless charging

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LM34938-Q1

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產品詳細資料

Rating Automotive Topology Buck-Boost Vin (max) (V) 36 Vin (min) (V) 3.5 Vout (max) (V) 45 Vout (min) (V) 1 Features Adjustable current limit, Dynamic voltage scaling, Enable, Forced PWM, Frequency synchronization, I2C, Light load efficiency, Load Disconnect, Output discharge, Power good, Synchronous rectification, Tracking, UVLO adjustable EMI features Frequency Dithering, Spread Spectrum Duty cycle (max) (%) 100 Iq (typ) (A) 0.000065 TI functional safety category Functional Safety-Capable Operating temperature range (°C) to
Rating Automotive Topology Buck-Boost Vin (max) (V) 36 Vin (min) (V) 3.5 Vout (max) (V) 45 Vout (min) (V) 1 Features Adjustable current limit, Dynamic voltage scaling, Enable, Forced PWM, Frequency synchronization, I2C, Light load efficiency, Load Disconnect, Output discharge, Power good, Synchronous rectification, Tracking, UVLO adjustable EMI features Frequency Dithering, Spread Spectrum Duty cycle (max) (%) 100 Iq (typ) (A) 0.000065 TI functional safety category Functional Safety-Capable Operating temperature range (°C) to
VQFN (RHA) 40 36 mm² 6 x 6
  • Input range from 3.5V to 36V
  • Dynamical Vo programming using I2C from:
    • 1V up to 45V 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 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
  • I2C programmable with diagnostics
  • Automotive temperature range (Tj = -40°C to 150°C)
  • 40-Pin WSON package with wettable flanks

  • Create a custom design using the LM34938-Q1 with the WEBENCH® Power Designer
  • Input range from 3.5V to 36V
  • Dynamical Vo programming using I2C from:
    • 1V up to 45V 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 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
  • I2C programmable with diagnostics
  • Automotive temperature range (Tj = -40°C to 150°C)
  • 40-Pin WSON package with wettable flanks

  • Create a custom design using the LM34938-Q1 with the WEBENCH® Power Designer

The LM34938-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 integrated DRV pin is used to control an optional disconnect FET for reverse polarity protection

LM34938-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 LM34938-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 integrated DRV pin is used to control an optional disconnect FET for reverse polarity protection

LM34938-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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* Data sheet LM34938-Q1 36V VIN 4 Switch Buck-Boost Controller With I2C for Wireless Charging datasheet PDF | HTML 2026年 2月 10日

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

LM251772EVM-PD — LM251772 評估模組

LM251772EVM-PD 展示使用 LM251772 的靈活高功率降壓升壓設計。評估模組 (EVM) 設定為在 9V 至 36V 輸入電壓範圍內運作，並且提供最高 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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開發板

LM34938Q1EVM-HD — LM34938-Q1 評估模組

LM34938Q1EVM-HD 展示使用 LM34938-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，並且提供輸出功率最高 50W 的穩壓 15V 至 28V 輸出。EVM 在切換頻率為 2.1MHz 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
TI.com 無法提供
開發模組 (EVM) 的 GUI

LM34938-CONFIGURATON-GUI — LM34938 GUI for configuration via I2C

Graphical User Interface (GUI) to configure the LM34938 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
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計算工具

LM34938-QUICKSTART-CALC — LM34938 BuckBoost Quickstart Calculator Tool

LM34938 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 LM34938.
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認證

LM34938Q1EVM-HD-DOC-CERT — LM34938Q1EVM-HD EU Declaration of Conformity (DoC)

LM34938Q1EVM-HD EU Declaration of Conformity (DoC)
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VQFN (RHA) 40 Ultra Librarian
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