LM51770

現行

78V 大範圍 VIN 雙向 4 開關降壓升壓控制器

產品詳細資料

Rating Catalog Topology Buck-Boost Vin (max) (V) 78 Vin (min) (V) 2.8 Vout (max) (V) 60 Vout (min) (V) 3.3 Features Adjustable current limit, Dynamic voltage scaling, Enable, Frequency synchronization, Light-load efficiency, Load Disconnect, Power good, Spread Spectrum, Synchronous rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 60 Duty cycle (max) (%) 100 EMI features Frequency Dithering, Spread Spectrum
Rating Catalog Topology Buck-Boost Vin (max) (V) 78 Vin (min) (V) 2.8 Vout (max) (V) 60 Vout (min) (V) 3.3 Features Adjustable current limit, Dynamic voltage scaling, Enable, Frequency synchronization, Light-load efficiency, Load Disconnect, Power good, Spread Spectrum, Synchronous rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 60 Duty cycle (max) (%) 100 EMI features Frequency Dithering, Spread Spectrum
HTSSOP (DCP) 38 62.08 mm² 9.7 x 6.4
  • Wide input range from 3.5V to 78V (85V absolute maximum)
    • Minimum 2.8V when V(BIAS) > 3.5V
  • Output voltage from 3.3V to 78V
  • Low shutdown IQ of 3µA
  • Low operating IQ of 60µA
  • 3% reverse current limit accuracy for precise charging currents
  • Average input and output current monitor or limiter
  • Dynamic output voltage tracking for PWM or analog input signals
  • Power save mode (PSM) selectable for high light load efficiency
  • Two integrated high-voltage supply LDOs with automatic selection
  • Fixed frequency across all operating modes (boost, buck-boost, buck)
    • Forced PWM mode selectable
    • Switching up to 1.8MHz for small solution and component size
    • External clock synchronization
  • Spread spectrum operation selectable
  • Adjustable undervoltage protection
  • Hiccup overcurrent and short protection
  • Wide input range from 3.5V to 78V (85V absolute maximum)
    • Minimum 2.8V when V(BIAS) > 3.5V
  • Output voltage from 3.3V to 78V
  • Low shutdown IQ of 3µA
  • Low operating IQ of 60µA
  • 3% reverse current limit accuracy for precise charging currents
  • Average input and output current monitor or limiter
  • Dynamic output voltage tracking for PWM or analog input signals
  • Power save mode (PSM) selectable for high light load efficiency
  • Two integrated high-voltage supply LDOs with automatic selection
  • Fixed frequency across all operating modes (boost, buck-boost, buck)
    • Forced PWM mode selectable
    • Switching up to 1.8MHz for small solution and component size
    • External clock synchronization
  • Spread spectrum operation selectable
  • Adjustable undervoltage protection
  • Hiccup overcurrent and short protection

The LM51770x is a four switch buck-boost controller. The device provides a regulated output voltage if the input voltage is higher, equal, or lower than the adjusted output voltage. In power save mode, the device supports high efficiency with low output loads due to its low quiescence currents. In power save mode, the device supports high efficiency close to 99% efficiency over the full range of the output current. The LM51770x runs at a fixed switching frequency, which is set through the RT or SYNC pin. The switching frequency remains the same during buck, boost, and buck-boost operation. The integrated and optional average current monitor helps monitor and limit input and output current of the LM51770x. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).

The LM51770x is a four switch buck-boost controller. The device provides a regulated output voltage if the input voltage is higher, equal, or lower than the adjusted output voltage. In power save mode, the device supports high efficiency with low output loads due to its low quiescence currents. In power save mode, the device supports high efficiency close to 99% efficiency over the full range of the output current. The LM51770x runs at a fixed switching frequency, which is set through the RT or SYNC pin. The switching frequency remains the same during buck, boost, and buck-boost operation. The integrated and optional average current monitor helps monitor and limit input and output current of the LM51770x. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).

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類型 標題 日期
* Data sheet LM51770x 78V Wide VIN Bidirectional 4-Switch Buck-Boost Controller datasheet (Rev. A) PDF | HTML 2025年 8月 20日
EVM User's guide LM51770 Buck-Boost Controller High Voltage Evaluation Module PDF | HTML 2025年 7月 31日
Application brief Current Monitoring with Positive and Negative Currents on LM5177x Devices (Rev. A) PDF | HTML 2024年 11月 25日
Application note Reverse Current Operation of the LM5177 Buck-Boost Converter PDF | HTML 2024年 7月 16日
Application note Parallel Operation of the Buck-Boost Converters Using LM5177 Buck-Boost Controller (Rev. A) PDF | HTML 2024年 2月 27日
Application brief A Simple Constant Voltage Regulation Using the MODE Pin (Rev. A) PDF | HTML 2024年 2月 15日
Application note Layout Optimization of 4-Switch Buck-Boost Converters PDF | HTML 2023年 9月 5日
Application brief Precise Current Limiter Over Wide Operation Voltages in Buck-Boost Converters PDF | HTML 2023年 9月 5日
Application brief Dynamic Current Tracking With the LM5177 4-Switch Buck Boost Controller 2023年 2月 24日
Application brief Constant Current Operation Using the Internal Current Limiter 2023年 1月 27日

設計與開發

如需其他條款或必要資源,請按一下下方的任何標題以檢視詳細頁面 (如有)。

開發板

LM51770EVM-HV — LM51770 buck-boost controller evaluation module

The LM51770EVM-HV evaluation module (EVM) demonstrates a flexible high-power buck-boost design using the LM51770. The EVM is configured to operate from an input voltage range of 36V to 48V and produce a regulated 48V output with up to 4A load current. The EVM operates with a switching frequency of (...)
使用指南: PDF | HTML
TI.com 無法提供
開發板

LM5177EVM-HP — 具四開關降壓升壓控制器的 LM5177 評估模組

LM5177EVM-HP 展示使用 LM5177 wide-vin 降壓升壓控制器的靈活高功率降壓升壓設計。評估模組設定為在 4.2 V 至 36 V 輸入電壓範圍內運作,並提供最高 9.4 A 負載電流的穩壓 16-V 輸出。
使用指南: PDF | HTML
TI.com 無法提供
計算工具

LM51770-QUICKSTART-CALC LM51770 BuckBoost Quickstart Calculator Tool

LM51770 BuckBoost Quickstart Calculator Tool. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck-boost converter based on the LM51770.
支援產品和硬體

支援產品和硬體

產品
AC/DC 和 DC/DC 控制器 (外部 FET)
LM51770 78V 大範圍 VIN 雙向 4 開關降壓升壓控制器 LM51770-Q1 78V 大範圍 VIN 雙向 4 開關降壓升壓控制器 LM517701 78V wide-VIN bidirectional 4-switch buck-boost controller
硬體開發
開發板
LM51770EVM-HV LM51770 buck-boost controller evaluation module
PCB 佈局

LM51770EVM-HV PCB Layout

SNVMCF2.ZIP (2519 KB)
參考設計

PMP41155 — 開放式運算專案® (OCP)、開放式機架 V3 12KW 電源電池備援單元 (BBU) 設計

此參考設計為四開關、降壓升壓 DC/DC 轉換器,用於電池備援單元 (BBU) 應用,符合開放式運算計畫(Open Compute Project®,OCP)開放式機架 V3 電源 BBU 規範。此設計具備 12KW 功率能力。轉換器可根據 Vin 和 Vout 電壓,以降壓、降壓升壓或升壓模式運作。轉換器在各模式之間順暢暫態。此設計採用峰值電流模式控制,可提供快速負載暫態響應。憑藉 LM51770 的特性,場效電晶體不需要額外驅動器。此設計共有六個相位,其中六個相位會並聯以進行電池放電操作,提供高達 12KW 的放電功率。
Test report: PDF
參考設計

PMP23377 — 四開關降壓升壓 DC/DC 轉換器參考設計

此參考設計為四開關、降壓升壓 DC/DC 轉換器,用於電池備援單元 (BBU) 應用,符合開放式運算計畫(Open Compute Project®,OCP)開放式機架 V3 電源 BBU 規範。此設計具備 1.4kW 功率能力。轉換器可根據 VIN 和 VOUT 電壓,以降壓、降壓升壓或升壓模式運作。轉換器在各模式之間順暢暫態。此設計採用峰值電流模式控制,可提供快速負載暫態響應。憑藉 LM51770 的特性,場效電晶體不需要額外驅動器。
Test report: PDF
封裝 針腳 CAD 符號、佔位空間與 3D 模型
HTSSOP (DCP) 38 Ultra Librarian

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  • 認證摘要
  • 進行中持續性的可靠性監測
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