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LM34938-Q1

VORSCHAU

Vier-Schalter-Abwärts-/Aufwärtsregler, Automobil., 36 V VIN, mit I2C u. 2,2 MHz FSW f. drahtl. Laden

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Datenblatt

LM34938-Q1

VORSCHAU
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 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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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Datum
* Data sheet LM34938-Q1 36V VIN 4 Switch Buck-Boost Controller With I2C for Wireless Charging datasheet PDF | HTML 10 Feb 2026
EVM User's guide LM34938-Q1 Buck-Boost Controller Evaluation Module PDF | HTML 12 Mär 2026

Design und Entwicklung

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Evaluierungsplatine

LM251772EVM-PD — LM251772 – Evaluierungsmodul

Das LM251772EVM-PD zeigt ein flexibles, leistungsstarkes Abwärts-/Aufwärts-Design unter Verwendung des LM251772. Das Evaluierungsmodul (EVM) ist für den Betrieb im Eingangsspannungsbereich von 9 V bis 36 V konfiguriert und erzeugt einen geregelten 5-V- bis 48-V-Ausgang mit bis zu 5 A Laststrom. (...)
Benutzerhandbuch: PDF | HTML
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Evaluierungsplatine

LM34938Q1EVM-HD — LM34938-Q1 evaluation module

The LM34938Q1EVM-HD demonstrates a flexible high power buck-boost design using the LM34938-Q1. The evaluation module is configured to operate from an input voltage range of 9V to 36V and to produce a regulated 15V to 28V output with up to a 50W output power. The EVM operates with a switching (...)
Benutzerhandbuch: PDF | HTML
Nicht verfügbar auf TI.com
GUI für Evaluierungsmodul (EVM)

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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Zertifizierung

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

LM34938Q1EVM-HD EU Declaration of Conformity (DoC)
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