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DC/DC 控制器

LM5119

現行

5.5-65V 大範圍 VIN 電流模式雙同步降壓控制器

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產品規格表

LM5119

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Multiphase Iout (max) (A) 15 Vin (max) (V) 65 Vin (min) (V) 5.5 Vout (max) (V) 64 Vout (min) (V) 0.8 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable Duty cycle (max) (%) 98 Iq (typ) (A) 0.006 Number of phases 2 Operating temperature range (°C) -40 to 125
Rating Catalog Topology Multiphase Iout (max) (A) 15 Vin (max) (V) 65 Vin (min) (V) 5.5 Vout (max) (V) 64 Vout (min) (V) 0.8 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable Duty cycle (max) (%) 98 Iq (typ) (A) 0.006 Number of phases 2 Operating temperature range (°C) -40 to 125
WQFN (RTV) 32 25 mm² (5 mm × 5 mm)
  • Emulated Peak Current Mode Control
  • Wide Operating Range (5.5 V to 65 V)
  • Easily Configurable for Dual Outputs or Interleaved Single Output
  • Robust 3.3-A Peak Gate Drive
  • Switching Frequency Programmable to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output from 0.8 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Hiccup Mode Overload Protection
  • Programmable Soft-Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switch-Over to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package
  • Emulated Peak Current Mode Control
  • Wide Operating Range (5.5 V to 65 V)
  • Easily Configurable for Dual Outputs or Interleaved Single Output
  • Robust 3.3-A Peak Gate Drive
  • Switching Frequency Programmable to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output from 0.8 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Hiccup Mode Overload Protection
  • Programmable Soft-Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switch-Over to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package

The LM5119 device is a dual synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The switching frequency is programmable from 50 kHz to 750 kHz. The LM5119 device drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator with automatic switch-over to external bias further improves efficiency. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line undervoltage lockout. The device is available in a power enhanced leadless 32-pin WQFN package featuring an exposed die attach pad to aid thermal dissipation.

The LM5119 device is a dual synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The switching frequency is programmable from 50 kHz to 750 kHz. The LM5119 device drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator with automatic switch-over to external bias further improves efficiency. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line undervoltage lockout. The device is available in a power enhanced leadless 32-pin WQFN package featuring an exposed die attach pad to aid thermal dissipation.
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LM25119 現行 4.5-42V 大範圍 VIN 電流模式雙同步降壓控制器 Lower Vin max at 42 V

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 LM5119 Wide Input Range Dual Synchronous Buck Controller datasheet (Rev. I) PDF | HTML 2018/1/29
類比設計期刊 Control-Mode Quick Reference Guide (Rev. B) PDF | HTML 2023/8/29
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 Understanding Inverting Buck-Boost Power Stages in Switch Mode Power Supplies (Rev. B) 2019/3/12
白皮書 Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 2018/7/3
類比設計期刊 Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016/7/21
技術文章 Power Tips: The ground plane – a critical element in noise management of switching PDF | HTML 2015/8/19
技術文章 Power Tips: Design considerations for a four-phase 1,200W synchronous buck – part PDF | HTML 2015/7/15
技術文章 Power Tips: Four-phase, 1.2-kW design achieves high efficiency at higher currents PDF | HTML 2015/6/10
白皮書 Power Management IC (PMIC) Guide for Automotive (Rev. A) 2014/10/29
更多文件說明 LM5119 and LM25119 Design tool 2014/2/26
白皮書 Wide VIN power management ICs simplify white paper (Rev. A) 2013/9/19
類比設計期刊 1Q 2012 Issue Analog Applications Journal 2012/1/31
類比設計期刊 Benefits of a multiphase buck converter 2012/1/31

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

LM5119EVAL — 適用於 LM5119 廣泛 Vin 雙同步降壓控制器的評估板

The LM5119EVAL evaluation board provides the design engineer with a fully functional dual output buck converter, employing the LM5119 Dual Emulated Current Mode Synchronous Buck Controller. The evaluation board is designed to provide both 10V and 5V outputs over an input range of 14V to 55V. Also (...)

使用指南: PDF
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模擬型號

LM5119 PSpice Transient Model

SNVM383.ZIP (227 KB) - PSpice 模型
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模擬型號

LM5119 Unencrypted PSpice Transient Model

SNVM961.ZIP (4 KB) - PSpice 模型
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計算工具

LM25119-5119QUICK-CALC — LM(2)5119 快速入門計算機

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參考設計

PMP10260 — 24Vdc 輸入 (雙汽車電池) 汽車多相同步降壓參考設計

這款高效率，高功率參考設計使用 LM5119 雙相同步降壓控制器，可在 60A 時調節 14.4V。此設計可用於從卡車上常見的雙電池系統供應單車電池電源。功能包含輸入 EMI 濾波、輸出熱插拔保護、輸入/輸出電流監控與溫度監控。

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參考設計

PMP20804 — 適用於企業系統伺服器的四分之一磚型雙相同步降壓轉換器參考設計

PMP20804 是採用 LM5119 雙同步降壓控制器 I.C. 的雙相同步降壓轉換器參考設計。此設計接受 20V 至 40V 的輸入電壓，並提供 12V 輸出，能夠供應 33A 電流給負載。這代表在四分之一磚型封裝尺寸下實現 400W 的功率密度設計。最大元件高度由 Coilcraft VER2923-103 電感器設定為 0.875 英吋。
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參考設計

PMP30168 — 具有 24VDC 輸入和 12VDC 輸出的 280W 車用雙相同步降壓參考設計

這款適合汽車應用的 280W 雙相同步降壓轉換器專為 24V 至 28V 額定輸入電壓設計，並支援啟動（低至 18V）和 < 58V 的負載突降。此設計可在 12 至 14V 的輸出電壓下提供高達 20A 的輸出電流，並可透過微調器外部設定。藉由加入輸入濾波器，此設計可實現極低的 EMI 和傳導發射。輸出電流可透過此設計中隨附的電流感測放大器監控。
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參考設計

PMP30464 — 適合受限空間的應用的 96-W/180-W 峰值雙交錯式降壓轉換器參考設計

這是雙交錯式降壓轉換器參考設計，涵蓋 17.0V 至 60.0V 的輸入電壓範圍。 輸出電壓為 12.0V，最大負載電流為 15.0A。 此設計經過空間最佳化，並支援 8.0A 平均負載電流
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