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LM51251A-Q1

現行

具有 VOUT 追蹤和 I2C 的車用 42V VIN、2.2MHz 雙相升壓控制器

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產品規格表

LM51251A-Q1

現行
產品規格表 立即訂購

產品詳細資料

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 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, Multiphase, 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 mm × 5 mm)
  • 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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重要文件 類型 標題 格式選項 下載最新的英文版本 日期
* 資料表 LM5125 1A -Q1, Wide-VIN, Dual-Phase, Boost Controller With VOUT Tracking and I2C datasheet PDF | HTML 2025/11/26
應用說明 Optimizing the High Side Switch Gate Ringing PDF | HTML 2026/4/16
應用說明 Asynchronous Operation of LM5125x Boost Controller PDF | HTML 2025/12/2
功能安全資訊 LM5125-Q1, LM5125A-Q1, and LM51251A-Q1 Functional Safety FIT Rate, FMD and Pin FMA (Rev. A) PDF | HTML 2025/9/9

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LM5125AEVM-BST — LM5125AEVM-BST 評估模組

LM5125AEVM-BST 評估模組展示了 LM5125A-Q1 寬輸入電壓同步雙相升壓控制器的功能和性能。此 EVM 旨在簡化配置，讓使用者能夠評估模組在不同條件下的性能。EVM 預設提供 24V/240W 輸出。可透過 ATRK/DTRK 接腳動態調整輸出電壓。
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計算工具

LM5125-CALC — LM5125(A) quick start calculator

LM5125(A) quick start calculator helps on design of the power stage, component selection and loop compensation.
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LM51251A-GUI — GUI for LM51251A

GUI for LM51251A
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VQFN (RHB) 32 Ultra Librarian
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