Startseite Energiemanagement AC/DC- und DC/DC-Controller (externer FET)
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LM51251A-Q1

AKTIV

Zweiphasiger Aufwärtsregler für 42 V VIN, 2,2 MHz mit VOUT-Tracking und I2C für Automobilindustrie

Produktdetails

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, Multiphase, Overcurrent protection with adjustable delay, Power good, Programmable dead time, Spread Spectrum, Tracking Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 250 Duty cycle (max) (%) 99.2 TI functional safety category Functional Safety-Capable EMI features Frequency Dithering, Spread Spectrum
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, Multiphase, Overcurrent protection with adjustable delay, Power good, Programmable dead time, Spread Spectrum, Tracking Operating temperature range (°C) -40 to 150 Iq (typ) (µA) 250 Duty cycle (max) (%) 99.2 TI functional safety category Functional Safety-Capable EMI features Frequency Dithering, Spread Spectrum
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 and operating IQ of 1.4mA
  • Stacking with interleaved multiphase operation
    • Up to 4-phases without external clock
  • 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 VQFN-32 package 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 and operating IQ of 1.4mA
  • Stacking with interleaved multiphase operation
    • Up to 4-phases without external clock
  • 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 VQFN-32 package with wettable flanks

The LM51251A-Q1 is a stackable, dual-phase, 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. Stack two devices with or without external clock.

Dynamically program VOUT using the analog or digital ATRK/DTRK function or I2C programming. VI is supported down to 2.5V after start-up 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, over and undervoltage protection, and the thermal shutdown protect the device and the application.

The LM51251A-Q1 is a stackable, dual-phase, 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. Stack two devices with or without external clock.

Dynamically program VOUT using the analog or digital ATRK/DTRK function or I2C programming. VI is supported down to 2.5V after start-up 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, over and undervoltage protection, and the thermal shutdown protect the device and the application.

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Typ Titel Datum
* Data sheet LM5125 1A -Q1, Wide-VIN, Dual-Phase, Boost Controller With VOUT Tracking and I2C datasheet PDF | HTML 26 Nov 2025
Application note Asynchronous Operation of LM5125x Boost Controller PDF | HTML 02 Dez 2025
Functional safety information LM5125-Q1, LM5125A-Q1, and LM51251A-Q1 Functional Safety FIT Rate, FMD and Pin FMA (Rev. A) PDF | HTML 09 Sep 2025

Design und Entwicklung

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Unterstützte Produkte und Hardware

Produkte
AC/DC- und DC/DC-Controller (externer FET)
LM5125-Q1 Zweiphasiger Aufwärtsregler für 2,2 MHz mit großem VIN-Bereich und VOUT-Tracking LM51251A-Q1 Zweiphasiger Aufwärtsregler für 42 V VIN, 2,2 MHz mit VOUT-Tracking und I2C für Automobilindustrie LM5125A-Q1 Zweiphasiger Aufwärtsregler für 2,2 MHz mit großem VIN-Bereich und VOUT-Tracking
Hardware-Entwicklung
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