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LM34938-Q1

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Datenblatt

LM34938-Q1

AKTIV
Datenblatt Jetzt bestellen

Produktdetails

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 & noise 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) 150 to -40
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 & noise 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) 150 to -40
  • 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)
    • Through I2C interface programming
  • Shutdown 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
    • Peak current capability: 2A
    • Bootstrap over and undervoltage protection
    • Integrated bootstrap 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
  • AEC-Q100 qualified for automotive applications
    • Junction temperature: –40°C to 150°C, TJ
  • 40-pin WSON package with wettable flanks
  • Functional Safety-Capable

  • 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)
    • Through I2C interface programming
  • Shutdown 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
    • Peak current capability: 2A
    • Bootstrap over and undervoltage protection
    • Integrated bootstrap 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
  • AEC-Q100 qualified for automotive applications
    • Junction temperature: –40°C to 150°C, TJ
  • 40-pin WSON package with wettable flanks
  • Functional Safety-Capable

  • 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 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 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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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt LM34938-Q1 Automotive, 36V VIN , 4-Switch Buck-Boost Controller With I2C for Wireless Charging datasheet (Rev. A) PDF | HTML 26.10.2026
Informationen zur funktionalen Sicherheit LM34938-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 25.09.2026
Anwendungshinweis Layout Optimization of 4-Switch Buck-Boost Converters PDF | HTML 05.09.2023

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