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LM51261A-Q1

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Controlador boost monofásico automotriz de 2.2 MHz con VIN de 42 V y seguimiento de VOUT e I2C

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LM51261A-Q1

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Detalles del producto

Rating Automotive Topology Boost Controller Vin (max) (V) 45 Vin (min) (V) 2.5 Vout (max) (V) 60 Vout (min) (V) 6 Control mode current mode control Features Adjustable current limit, Adjustable soft start, Adjustable switching frequency, Analog current monitor, Automatic Light Load Management, Automotive load dump, Bypass Mode, Chip-enable control pin, Cycle-by-cycle overcurrent protection, External Sync, Fixed PWM Mode, I2C interface, Overcurrent protection with adjustable delay, Power good, Programmable dead time, Spread Spectrum, Tracking EMI features Frequency Dithering, Spread Spectrum Duty cycle (max) (%) 99.2 Iq (typ) (A) 0.00025 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
Rating Automotive Topology Boost Controller Vin (max) (V) 45 Vin (min) (V) 2.5 Vout (max) (V) 60 Vout (min) (V) 6 Control mode current mode control Features Adjustable current limit, Adjustable soft start, Adjustable switching frequency, Analog current monitor, Automatic Light Load Management, Automotive load dump, Bypass Mode, Chip-enable control pin, Cycle-by-cycle overcurrent protection, External Sync, Fixed PWM Mode, I2C interface, Overcurrent protection with adjustable delay, Power good, Programmable dead time, Spread Spectrum, Tracking EMI features Frequency Dithering, Spread Spectrum Duty cycle (max) (%) 99.2 Iq (typ) (A) 0.00025 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
VQFN (RHB) 32 25 mm² 5 x 5
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: TA = –40°C to +125°C
  • Functional Safety-Capable
  • Input voltage 4.5V to 42V
    • Minimum 2.5V for V(BIAS) ≥4.5V or VOUT ≥6V
  • Output voltage 6V to 60V
    • Adjustable by resistor or by I2C in 1V steps
    • Adjustable slew rate when programmed by I2C
    • 2% accuracy, internal feedback resistors
    • Bypass operation for VI > VOUT
    • Dynamic output voltage tracking
      • Digital PWM tracking (DTRK)
      • Analog tracking (ATRK)
    • Overvoltage protection (64V, 50V, 35V, 28.5V)
  • Low shutdown IQ of 2µA
  • Low operating IQ of 1mA
  • 3-phase operation with LM51251A-Q1
  • Switching frequency from 100kHz to 2.2MHz
    • Synchronization to external clock (SYNCIN)
    • Dynamically selectable switching modes (FPWM, diode emulation)
    • Spread spectrum (DRSS)
  • I2C Interface with 8 selectable addresses
  • I2C programmable dead time (14ns to 200ns)
  • Current sense resistor or DCR sensing
  • Average inductor current monitor
  • Average input current limit
    • Programmable current limit
    • Selectable delay time
  • nFAULT indicator
  • Programmable VI undervoltage lockout (UVLO)
  • Lead-less QFN-32 packable with wettable flanks
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: TA = –40°C to +125°C
  • Functional Safety-Capable
  • Input voltage 4.5V to 42V
    • Minimum 2.5V for V(BIAS) ≥4.5V or VOUT ≥6V
  • Output voltage 6V to 60V
    • Adjustable by resistor or by I2C in 1V steps
    • Adjustable slew rate when programmed by I2C
    • 2% accuracy, internal feedback resistors
    • Bypass operation for VI > VOUT
    • Dynamic output voltage tracking
      • Digital PWM tracking (DTRK)
      • Analog tracking (ATRK)
    • Overvoltage protection (64V, 50V, 35V, 28.5V)
  • Low shutdown IQ of 2µA
  • Low operating IQ of 1mA
  • 3-phase operation with LM51251A-Q1
  • Switching frequency from 100kHz to 2.2MHz
    • Synchronization to external clock (SYNCIN)
    • Dynamically selectable switching modes (FPWM, diode emulation)
    • Spread spectrum (DRSS)
  • I2C Interface with 8 selectable addresses
  • I2C programmable dead time (14ns to 200ns)
  • Current sense resistor or DCR sensing
  • Average inductor current monitor
  • Average input current limit
    • Programmable current limit
    • Selectable delay time
  • nFAULT indicator
  • Programmable VI undervoltage lockout (UVLO)
  • Lead-less QFN-32 packable with wettable flanks

The LM51261A-Q1 is a synchronous boost controller with I2C interface. The device provides a regulated output voltage for lower or equal input voltage also supporting VI to VOUT bypass mode to save power. The device can be stacked in combination with LM51251A-Q1 for 3-phase operation.

Dynamically program VOUT using the analog or digital ATRK/DTRK function or I2C programming. VI is supported down to 2.5V after startup as the internal VCC supply is automatically switched from VBIAS to VOUT for VBIAS < 4.5V. The fixed switching frequency is set between 100kHz and 2.2MHz through a resistor on the RT-pin or the SYNCIN clock. The switching modes FPWM or diode emulation can be changed during operation.

The implemented protections peak current limit, average input current limit, average inductor current monitor, overvoltage and undervoltage protection, and the thermal shutdown protect the device and the application.

The LM51261A-Q1 is a synchronous boost controller with I2C interface. The device provides a regulated output voltage for lower or equal input voltage also supporting VI to VOUT bypass mode to save power. The device can be stacked in combination with LM51251A-Q1 for 3-phase operation.

Dynamically program VOUT using the analog or digital ATRK/DTRK function or I2C programming. VI is supported down to 2.5V after startup as the internal VCC supply is automatically switched from VBIAS to VOUT for VBIAS < 4.5V. The fixed switching frequency is set between 100kHz and 2.2MHz through a resistor on the RT-pin or the SYNCIN clock. The switching modes FPWM or diode emulation can be changed during operation.

The implemented protections peak current limit, average input current limit, average inductor current monitor, overvoltage and undervoltage protection, and the thermal shutdown protect the device and the application.
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Documentación técnica

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* Data sheet LM5126 1 A-Q1, Wide-VIN, Single-Phase, Boost Controller with VOUT Tracking and I2C datasheet PDF | HTML 26 nov 2025
Functional safety information LM5126A-Q1 and LM51261A-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 24 oct 2025

Diseño y desarrollo

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Placa de evaluación

LM5126AEVM-BST — Módulo de evaluación LM5126A

El módulo de evaluación LM5126AEVM-BST muestra las características y el rendimiento del controlador elevador sincrónico de tensión de entrada amplia LM5126A-Q1. Este EVM está diseñado para facilitar la configuración, lo que permite al usuario evaluar diferentes condiciones en el módulo. La (...)
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Herramienta de diseño

LM51261A-GUI — GUI for LM51261A

GUI for LM51261A
Productos y hardware compatibles

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DC/DC controllers
  • LM51261A-Q1 — Controlador boost monofásico automotriz de 2.2 MHz con VIN de 42 V y seguimiento de VOUT e I2C
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