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AC/DC 和 DC/DC 控制器 (外部 FET)

LM51231-Q1

現行

具有輸出電壓追蹤功能的 2.2-MHz 大範圍 VIN、同步升壓控制器

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產品規格表

LM51231-Q1

現行
產品規格表 立即訂購

產品詳細資料

Rating Automotive Topology Boost Vin (max) (V) 42 Vin (min) (V) 0.8 Vout (max) (V) 57 Vout (min) (V) 5 Control mode current mode Features Adjustable current limit, Bypass Mode, Dynamic voltage scaling, Enable, Frequency synchronization, Hiccup mode protection, Improved max. duty cycle, Light-load efficiency, Power good, Spread Spectrum, Synchronous rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 11 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable EMI features Frequency Dithering, Spread Spectrum
Rating Automotive Topology Boost Vin (max) (V) 42 Vin (min) (V) 0.8 Vout (max) (V) 57 Vout (min) (V) 5 Control mode current mode Features Adjustable current limit, Bypass Mode, Dynamic voltage scaling, Enable, Frequency synchronization, Hiccup mode protection, Improved max. duty cycle, Light-load efficiency, Power good, Spread Spectrum, Synchronous rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 11 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable EMI features Frequency Dithering, Spread Spectrum
VQFN (RGR) 20 12.25 mm² 3.5 x 3.5
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • Suited for wide operating range automotive battery powered applications
    • 3.8V to 42V input operating range
    • Dynamically programmable VOUT from 5V to 20V, or from 15V to 57V
    • Minimum boost input 0.8V when BIAS ≥ 3.8V
    • Bypass operation when VSUPPLY > VLOAD
  • BIAS shutdown current ≤ 3µA
  • Small solution size
    • Maximum switching frequency 2.2MHz
    • Internal boot diode
    • QFN-20 with wettable flanks
  • EMI mitigation and avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Switching frequency from 100kHz to 2.2MHz
    • Selectable switching mode (FPWM, diode emulation)
    • Optional programmable spread spectrum
    • Lead-less package
  • Programmability and flexibility
    • Dynamic VOUT tracking
    • Dynamic switching frequency programming
    • Supports DCR inductor current sensing
    • Programmable input voltage UVLO
    • Adjustable soft start
    • Adaptive dead-time
    • PGOOD indicator
  • Integrated protection features
    • Constant cycle-by-cycle peak current limit over VSUPPLY
    • Overvoltage protection
    • HB-SW short protection
    • Thermal shutdown
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • Suited for wide operating range automotive battery powered applications
    • 3.8V to 42V input operating range
    • Dynamically programmable VOUT from 5V to 20V, or from 15V to 57V
    • Minimum boost input 0.8V when BIAS ≥ 3.8V
    • Bypass operation when VSUPPLY > VLOAD
  • BIAS shutdown current ≤ 3µA
  • Small solution size
    • Maximum switching frequency 2.2MHz
    • Internal boot diode
    • QFN-20 with wettable flanks
  • EMI mitigation and avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Switching frequency from 100kHz to 2.2MHz
    • Selectable switching mode (FPWM, diode emulation)
    • Optional programmable spread spectrum
    • Lead-less package
  • Programmability and flexibility
    • Dynamic VOUT tracking
    • Dynamic switching frequency programming
    • Supports DCR inductor current sensing
    • Programmable input voltage UVLO
    • Adjustable soft start
    • Adaptive dead-time
    • PGOOD indicator
  • Integrated protection features
    • Constant cycle-by-cycle peak current limit over VSUPPLY
    • Overvoltage protection
    • HB-SW short protection
    • Thermal shutdown

The LM51231-Q1 device is a wide input range synchronous boost controller that employs peak current mode control. The device’s wide input range supports automotive cold-crank and load dump. The minimum input voltage can be as low as 0.8V when BIAS is equal to or greater than 3.8V. The output voltage can be dynamically programmed by using the tracking function. Bypass mode operation is automatically entered when VSUPPLY > VLOAD, eliminating the body diode drop of the high-side MOSFET. The switching frequency is dynamically programmed with an external resistor from 100kHz to 2.2MHz. Switching at 2.2MHz minimizes AM band interference and allows a small solution size and fast transient response.

The device has built-in protection features such as peak current limit, which is constant over VSUPPLY, overvoltage protection, and thermal shutdown. External clock synchronization, programmable spread spectrum modulation, and a lead-less package with minimal parasitic, help to reduce EMI and avoid cross talk. Additional features include line UVLO, FPWM, diode emulation, DCR inductor current sensing, programmable soft start, and a power-good indicator

The LM51231-Q1 device is a wide input range synchronous boost controller that employs peak current mode control. The device’s wide input range supports automotive cold-crank and load dump. The minimum input voltage can be as low as 0.8V when BIAS is equal to or greater than 3.8V. The output voltage can be dynamically programmed by using the tracking function. Bypass mode operation is automatically entered when VSUPPLY > VLOAD, eliminating the body diode drop of the high-side MOSFET. The switching frequency is dynamically programmed with an external resistor from 100kHz to 2.2MHz. Switching at 2.2MHz minimizes AM band interference and allows a small solution size and fast transient response.

The device has built-in protection features such as peak current limit, which is constant over VSUPPLY, overvoltage protection, and thermal shutdown. External clock synchronization, programmable spread spectrum modulation, and a lead-less package with minimal parasitic, help to reduce EMI and avoid cross talk. Additional features include line UVLO, FPWM, diode emulation, DCR inductor current sensing, programmable soft start, and a power-good indicator
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類型 標題 日期
* Data sheet LM51231-Q1 2.2MHz Wide VIN Synchronous Boost Controller with VOUT Tracking datasheet (Rev. A) PDF | HTML 2025年 11月 6日
Functional safety information LM51231-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 2022年 9月 13日

設計與開發

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開發板

LM5123EVM-BST — LM5123 升壓控制器評估模組

LM5123EVM-BST 評估模組展示 LM5123-Q1 寬輸入電壓同步升壓控制器的功能和性能。標準配置旨在提供 100W 下的 24V 穩壓輸出，輸入電壓為 9V 至 18V，開關頻率為 440 kHz。使用 LM5123-Q1 的 TRK 引腳，可將 100 W 下的輸出電壓動態修改為最高 45V。

此 EVM 旨在簡化配置，讓使用者能夠在同一模組上評估多種不同應用。功能包括：低 IQ 操作、內部回饋電阻、當 VIN 大於 VOUT 時的旁路模式操作、動態輸出電壓追蹤、電源良好 (PGOOD) 指示器、可編程頻率抖動、可編程欠電壓鎖定 (UVLO) 及過電壓保護。

使用指南: PDF | HTML
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模擬型號

LM51231-Q1 PSpice Average Model

SLVMDY8.ZIP (74 KB) - PSpice Model
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模擬型號

LM51231-Q1 PSpice Transient Model

SLVMDY7.ZIP (139 KB) - PSpice Model
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CAD/CAE 符號

LM5123EVM-BST Altium CAD Files

SNVR528.ZIP (1352 KB)
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計算工具

LM5123-Q1-DESIGNCALC — LM5123-Q1 快速入門計算機

歡迎使用 LM5123-Q1 的快速入門設計工具。此獨立工具會加速協助提供電源供應器工程師採用以上控制器的 DC/DC 升壓轉換器進行設計。因此，使用者可以迅速達到最佳化的設計，以符合應用需求。
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設計工具

TIDA-020033-TD-DESIGN — TIDA-020033 test documentation

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參考設計

TIDA-020033 — 車用 H 類音訊與追蹤電源供應器參考設計

此參考設計展示 H 類音訊與追蹤電源供應音訊子系統。TAS6584-Q1 音訊放大器可追蹤數位音訊輸入的包絡線，並調整 LM5123-Q1 升壓輸出電壓以符合電源效率需求，無需使用外部微控制器。此參考設計可提升效率、熱性能，且總體積更小。此外，此參考設計也允許 H 類實作隨插即用，對汽車音訊架構的其他部分只有最少的軟體更動。
Design guide: PDF
封裝 針腳 CAD 符號、佔位空間與 3D 模型
VQFN (RGR) 20 Ultra Librarian
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