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LM34938-Q1

PRESENTACIÓN PRELIMINAR

Controlador buck-boost automotriz de cuatro interruptores con VIN de 36 V con I²C y frecuencia de co

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LM34938-Q1

PRESENTACIÓN PRELIMINAR
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Detalles del producto

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) 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 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
VQFN (RHA) 40 36 mm² (6 mm × 6 mm)
  • 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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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos LM34938-Q1 36V VIN 4 Switch Buck-Boost Controller With I2C for Wireless Charging datasheet PDF | HTML 10/02/2026
Nota sobre la aplicación Layout Optimization of 4-Switch Buck-Boost Converters PDF | HTML 5/09/2023

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

LM251772EVM-PD — Módulo de evaluación LM251772

El LM251772EVM-PD demuestra un diseño flexible buck-boost de alta potencia que utiliza el LM251772. El módulo de evaluación (EVM) está configurado para funcionar con un rango de tensión de entrada de 9 V a 36 V y producir una salida regulada de 5 V a 48 V con hasta 5 A de corriente de carga. El (...)
Guía del usuario: PDF | HTML
Productos y hardware compatibles
En inventario
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No disponible
Placa de evaluación

LM34938Q1EVM-HD — Módulo de evaluación LM34938-Q1

El LM34938Q1EVM-HD demuestra un diseño flexible buck-boost de alta potencia que utiliza el LM34938-Q1. El módulo de evaluación está configurado para funcionar con un rango de tensión de entrada de 9 V a 36 V y producir una salida regulada de 15 V a 28 V con hasta 50 W de potencia de salida. El EVM (...)
Guía del usuario: PDF | HTML
Productos y hardware compatibles
En inventario
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??asset.out-of-stock-ti_es_MX??
No disponible
GUI para el módulo de evaluación (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
Productos y hardware compatibles
Herramienta de cálculo

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.
Productos y hardware compatibles
Certificación

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

LM34938Q1EVM-HD EU Declaration of Conformity (DoC)
Productos y hardware compatibles
Encapsulado Pines Símbolos CAD, huellas y modelos 3D
VQFN (RHA) 40 Ultra Librarian
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