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DC/DC 控制器

LM5125-Q1

現行

具有 VOUT 追蹤的大範圍 VIN、2.2MHz 雙相位升壓控制器

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產品規格表

LM5125-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, 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, 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
    • 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 1.4mA
  • Switching frequency from 100kHz to 2.2MHz
    • Synchronization to external clock (SYNCIN)
    • Dynamically selectable switching modes (FPWM, diode emulation)
    • Spread spectrum (DRSS)
  • Selectable 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
  • Power-good 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
    • 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 1.4mA
  • Switching frequency from 100kHz to 2.2MHz
    • Synchronization to external clock (SYNCIN)
    • Dynamically selectable switching modes (FPWM, diode emulation)
    • Spread spectrum (DRSS)
  • Selectable 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
  • Power-good indicator
  • Programmable VI undervoltage lockout (UVLO)
  • Lead-less VQFN-32 package with wettable flanks

The LM5125-Q1 is a dual-phase, synchronous boost controller. The device provides a regulated output voltage for lower or equal input voltage also supporting VI to VOUT bypass mode to save power.

Dynamically program VOUT using the analog or digital ATRK/DTRK function. 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 LM5125-Q1 is a dual-phase, synchronous boost controller. The device provides a regulated output voltage for lower or equal input voltage also supporting VI to VOUT bypass mode to save power.

Dynamically program VOUT using the analog or digital ATRK/DTRK function. 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-Q1, Wide-VIN, Dual-Phase, Automotive, Boost Controller With VOUT Tracking datasheet (Rev. C) PDF | HTML 2026/1/28
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

設計與開發

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開發板

LM5125EVM-BST — LM5125 評估模組

LM5125EVM-BST 展示了 LM5125-Q1 寬輸入電壓同步雙相升壓控制器的功能和性能。此評估模組旨在簡化配置，讓使用者能夠評估模組在不同條件下的性能。標準配置旨在提供 24V，300W 輸出。輸出電壓可透過 ATRK/DTRK 接腳進行動態調整。
使用指南: PDF | HTML
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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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參考設計

PMP31263 — 適合 H 類音訊應用的雙相位升壓轉換器參考設計

此參考設計採用適用於 H 類音訊應用的雙相位車用升壓轉換器，可提供類比或數位輸出電壓追蹤。在 11V 輸入電壓下可達到 800W 以上的峰值輸出功率。

此測試報告以使用外部電阻器進行配置的 LM5125-Q1 為基礎。此設計也可使用提供 I²C 以進行診斷和控制的接腳相容 LM51251-Q1 變體。

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參考設計

PMP31306 — 適合 H 類音訊應用的 GaN 式雙相位升壓轉換器參考設計

此設計為雙相汽車升壓轉換器，採用 LMG2100R026 氮化鎵 (GaN) 半橋並提供類比或數位輸出電壓追蹤，適用於 H 類音訊應用。11V 輸入電壓下的輸出功率為 1000W（12V 時峰值為 1250W）。轉換器面積測量為 47mm × 48mm，不包括反向極性保護和大型輸入電容。此設計是以 LM5125-Q1 為基礎。此設計也可使用提供額外 I²C 以進行診斷和控制的接腳相容 LM51251-Q1 變體。
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