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DC/DC 轉換器

LM5161-Q1

現行

寬輸入 4.5-V 至 100-V、1-A 同步降壓 / Fly-Buck 轉換器

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產品規格表

現在提供此產品的更新版本

open-in-new 比較替代產品
功能相同，但針腳輸出與所比較的裝置不同。
LM5164-Q1 現行 具有超低 IQ 的 6V 至 100V 輸入、1A 同步 DC-DC 降壓轉換器 Ultra-low EMI emission.

LM5161-Q1

現行
產品規格表 立即訂購

產品詳細資料

Rating Automotive Topology Buck, Flybuck Iout (max) (A) 1 Vin (max) (V) 100 Vin (min) (V) 4.5 Vout (max) (V) 92 Vout (min) (V) 2 Switch current limit (typ) (A) 1.6 Features Enable, Light load efficiency, Pre-bias soft start, Synchronous rectification Control mode COT with emulated ripple, Constant on-time (COT) Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.00005 Duty cycle (max) (%) 92
Rating Automotive Topology Buck, Flybuck Iout (max) (A) 1 Vin (max) (V) 100 Vin (min) (V) 4.5 Vout (max) (V) 92 Vout (min) (V) 2 Switch current limit (typ) (A) 1.6 Features Enable, Light load efficiency, Pre-bias soft start, Synchronous rectification Control mode COT with emulated ripple, Constant on-time (COT) Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.00005 Duty cycle (max) (%) 92
HTSSOP (PWP) 14 32 mm² (5 mm × 6.4 mm)
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C5
  • Wide 4.5-V to 100-V Input Voltage Range
  • Integrated High-Side and Low-Side Switches
    • No Schottky Diode Required
  • 1-A Maximum Load Current
  • Constant ON-Time Control
    • No External Loop Compensation
    • Fast Transient Response
  • Selectable DCM Buck Operation at Light Load
  • CCM Option Supports Multi-Output Fly-Buck™
  • No External Ripple circuit needed (at FPWM = 0)
  • Nearly Constant Switching Frequency
  • Frequency Adjustable Up to 1 MHz
  • Programmable Soft-Start Time
  • Prebias Start-Up
  • Peak Current Limiting Protection
  • Adjustable Input UVLO and Hysteresis
  • ±1% Feedback Voltage Reference
  • Thermal Shutdown Protection
  • Create a Custom Design Using the LM5161-Q1 With the WEBENCH® Power Designer
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C5
  • Wide 4.5-V to 100-V Input Voltage Range
  • Integrated High-Side and Low-Side Switches
    • No Schottky Diode Required
  • 1-A Maximum Load Current
  • Constant ON-Time Control
    • No External Loop Compensation
    • Fast Transient Response
  • Selectable DCM Buck Operation at Light Load
  • CCM Option Supports Multi-Output Fly-Buck™
  • No External Ripple circuit needed (at FPWM = 0)
  • Nearly Constant Switching Frequency
  • Frequency Adjustable Up to 1 MHz
  • Programmable Soft-Start Time
  • Prebias Start-Up
  • Peak Current Limiting Protection
  • Adjustable Input UVLO and Hysteresis
  • ±1% Feedback Voltage Reference
  • Thermal Shutdown Protection
  • Create a Custom Design Using the LM5161-Q1 With the WEBENCH® Power Designer

The LM5161-Q1 is a 100-V, 1-A synchronous step-down converter with integrated high-side and low-side MOSFETs. The constant-ON-time control scheme requires no loop compensation and supports high step-down ratios with fast transient response. An internal feedback amplifier maintains ±1% output voltage regulation over the entire operating temperature range. The ON-time varies inversely with input voltage resulting in nearly constant switching frequency. Peak and valley current limit circuits protect against overload conditions. The under-voltage lockout (EN/UVLO) circuit provides independently adjustable input undervoltage threshold and hysteresis. The FPWM input pin in LM5161-Q1 selects either the forced continuous conduction mode (CCM) under all load levels or the discontinuous conduction mode (DCM) under light or no load conditions. When operating in forced CCM, the LM5161-Q1 supports the multiple output and isolated Fly-Buck applications. When programmed for the DCM operation, the LM5161-Q1 provides a tightly regulated buck output without any additional external feedback ripple injection circuit.

The LM5161-Q1 is a 100-V, 1-A synchronous step-down converter with integrated high-side and low-side MOSFETs. The constant-ON-time control scheme requires no loop compensation and supports high step-down ratios with fast transient response. An internal feedback amplifier maintains ±1% output voltage regulation over the entire operating temperature range. The ON-time varies inversely with input voltage resulting in nearly constant switching frequency. Peak and valley current limit circuits protect against overload conditions. The under-voltage lockout (EN/UVLO) circuit provides independently adjustable input undervoltage threshold and hysteresis. The FPWM input pin in LM5161-Q1 selects either the forced continuous conduction mode (CCM) under all load levels or the discontinuous conduction mode (DCM) under light or no load conditions. When operating in forced CCM, the LM5161-Q1 supports the multiple output and isolated Fly-Buck applications. When programmed for the DCM operation, the LM5161-Q1 provides a tightly regulated buck output without any additional external feedback ripple injection circuit.
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技術文件

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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 LM5161-Q1 Wide Input 100-V, 1-A Synchronous Buck/Fly-Buck™ Converter datasheet (Rev. A) PDF | HTML 2017/11/30
白皮書 Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 2019/4/10
應用說明 Stability Analysis and Design of COT Type-3 Ripple Circuit 2019/3/20
Application brief Powering Drones With a Wide VIN DC-DC Converter (Rev. A) 2019/2/5
應用說明 EMI and Thermal Design Tips and Tricks for 48-V IGBT/SiC/GaN Automotive Supply 2018/7/27
技術文章 Why a wide VIN DC/DC converter is a good fit for high-cell-count battery-powered d PDF | HTML 2017/11/21
技術文章 Simplifying 100V wide VIN power conversion PDF | HTML 2016/11/11
技術文章 Create a Fly-Buck™ converter in WEBENCH® Power Designer PDF | HTML 2015/10/9
白皮書 Designing isolated rails on the fly with Fly-Buck™ converters 2015/9/29
技術文章 How to design for EMC and isolation with Fly-Buck™ converters PDF | HTML 2015/7/28
應用說明 Is Your IGBT Gate-Driver Power Supply Optimized 2015/3/12
類比設計期刊 Fly-Buck(TM) converter provides EMC and isolation in PLC applications 2015/1/29
應用說明 AN-2292 Designing an Isolated Buck (Fly-Buck) Converter (Rev. C) 2014/12/17
白皮書 Wide VIN power management ICs simplify white paper (Rev. A) 2013/9/19

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

LM5161PWPBKEVM — LM5161 寬輸入電壓同步降壓轉換器恒定導通時間評估模組

LM5161PWPBKEVM 評估板採用恆定導通時間 (COT) 操作原理，提供全功能降壓穩壓器。此評估板可在 15V 至 80V 的輸入範圍內提供 12V 輸出。該電路可提供最高 1.0A 的負載電流。此應用電路圖設定為可由 48V 額定匯流排運作。額定切換頻率約為 300kHz。高壓側和低壓側 MOSFET 皆整合至 LM5161 內。
使用指南: PDF
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開發板

LM5161PWPFBKEVM — LM5161 寬輸入電壓 Fly-Buck 評估模組

LM5161PWPFBKEVM 評估板採用恆定導通時間 (COT) 操作原理，提供全功能 Fly-Buck 穩壓器。此評估板可在 36V 至 72V 的輸入範圍內提供 12V 二次隔離輸出電壓。該電路可提供最高 800mA 的二次輸出負載電流。此應用電路圖設定為可由 48V 額定匯流排運作。額定切換頻率約為 300kHz。高壓側和低壓側 MOSFET 皆整合至 LM5161 內。
使用指南: PDF
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模擬型號

LM5161 PSpice Buck and Fly-Buck Transient Model

SNVMAV3.ZIP (499 KB) - PSpice 模型
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模擬型號

LM5161 Unencrypted PSpice Buck and Fly-Buck Transient Model

SNVMAV4.ZIP (3 KB) - PSpice 模型
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參考設計

PMP15007 — 具有超小型耦合電感器的雙輸出 LM5161-Q1 Fly-Buck™ 參考設計

PMP15007 在 Fly-Buck 拓撲中使用 LM5161-Q1，並且一次和二次輸出均設為 5V 的額定值。此電路適應 36V 至 72V 的電壓輸入範圍，最適合 48V 額定輸入軌。雖然一次側額定設定為 5.32V，但是使用回饋電阻器時，二次隔離側的值為 5V，並以匝數比為 1:1 的 Coilcraft LPD8035V 串聯耦合電感器為基礎。一次和二次軌上的最大運作電流均設定為 225mA。  切換頻率設定為 315kHz 的額定值。
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參考設計

PMP30603 — -60 V 反相降壓-升壓參考設計

此小型參考設計可從通常由汽車前置穩壓器產生大約 5V 的輸入電壓提供 -60V 的輸出電壓。該電路中的控制器為提供兩個內部 MOSFET 的 LM5161-Q1。整體而言，此轉換器可當成 LiDAR 應用的輔助電源供應器使用。 
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HTSSOP (PWP) 14 Ultra Librarian
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