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AC/DC 和 DC/DC 控制器 (外部 FET)

LM25119

現行

4.5-42V 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

LM25119

現行
產品規格表 立即訂購

產品詳細資料

Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 40 Operating temperature range (°C) -40 to 125 Control mode current mode Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 41.3 Iq (typ) (A) 0.006 Duty cycle (max) (%) 98 Number of phases 2
Vin (min) (V) 4.5 Vin (max) (V) 42 Iout (max) (A) 40 Operating temperature range (°C) -40 to 125 Control mode current mode Rating Catalog Vout (min) (V) 0.8 Vout (max) (V) 41.3 Iq (typ) (A) 0.006 Duty cycle (max) (%) 98 Number of phases 2
WQFN (RTV) 32 25 mm² 5 x 5
  • Emulated Peak Current Mode Control
  • Wide Operating Range (4.5 V to 42 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 Switchover to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package
  • Emulated Peak Current Mode Control
  • Wide Operating Range (4.5 V to 42 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 Switchover to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package

The LM25119 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 LM25119 device drives external high-side and low-side N-channel MOS 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 LM25119 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 LM25119 device drives external high-side and low-side N-channel MOS 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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類型 標題 日期
* Data sheet LM25119 Wide Input Range, Dual Synchronous Buck Controller datasheet (Rev. I) PDF | HTML 2018年 1月 29日
White paper Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) 2019年 4月 10日
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 2018年 7月 3日
Selection guide Power Management Guide 2018 (Rev. R) 2018年 6月 25日
Technical article How to use dual buck controllers to power PMICs in automotive applications PDF | HTML 2017年 11月 8日
More literature LM5119, LM25119 Quick Start Calculator (Rev. B) 2017年 2月 3日
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016年 7月 21日
White paper Power Management IC (PMIC) Guide for Automotive (Rev. A) 2014年 10月 29日
More literature LM5119 and LM25119 Design tool 2014年 2月 26日
User guide AN-2065 LM5119 Evaluation Board (Rev. B) 2013年 4月 24日
User guide AN-2066 LM25119 Evaluation Board (Rev. B) 2013年 4月 24日
User guide AN-2103 LM5117 Evaluation Board (Rev. B) 2013年 4月 24日
User guide AN-2112 LM25117 Evaluation Board (Rev. B) 2013年 4月 24日
Analog Design Journal 1Q 2012 Issue Analog Applications Journal 2012年 1月 31日
Analog Design Journal Benefits of a multiphase buck converter 2012年 1月 31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

LM25119EVAL — 適用於 LM25119 廣泛 Vin 雙同步降壓控制器的評估板

The LM25119EVAL evaluation board provides the design engineer with a fully functional dual output buck converter, employing the LM25119 Dual Emulated Current Mode Synchronous Buck Controller. The evaluation board is designed to provide both 3.3V and 1.8V outputs over an input range of 6.0V to 36V. (...)

使用指南: PDF
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模擬型號

LM25119 PSpice Transient Model

SNVM384.ZIP (227 KB) - PSpice Model
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模擬型號

LM25119 TINA-TI Transient Reference Design (LOAD TRANSIENT)

SNVM484.TSC (154 KB) - TINA-TI Reference Design
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模擬型號

LM25119 TINA-TI Transient Reference Design (STARTUP)

SNVM483.TSC (224 KB) - TINA-TI Reference Design
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模擬型號

LM25119 TINA-TI Transient Spice Model

SNVM482.ZIP (26 KB) - TINA-TI Spice Model
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模擬型號

LM25119 Unencrypted PSpice Transient Model

SNVM865.ZIP (4 KB) - PSpice Model
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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

PMP10664 — 適合工業應用的 35W 雙輸出降壓參考設計

The PMP10664 reference design is a 35W dual-output synchronous buck converter using the LM25119 controller IC.  The design accepts an input voltage of 9.8Vin to 15.1Vin, provides one output of 3.3V capable of supplying 6.5A of current and one output of 3.3V capable of supplying 4A of (...)
Test report: PDF
電路圖: PDF
參考設計

PMP20021 — 24V 輸入電壓雙相同步降壓轉換器 (12V@20A) 參考設計

This two phase synchronous buck converter allows smaller components with better distributed thermal performance than an equivalent single phase design. It achieves high efficiency, uses small inductors and easily fits in a small PCB area of 70mm x 70mm.
Test report: PDF
電路圖: PDF
參考設計

PMP9700 — 參考設計 - 可提供 300W 的高效率雙相同步降壓

This two-phase synchronous buck operates from 24VDC and supplies an output of 15V@20A. Operation at 300KHz (per phase) delivers small size and greater than 96% efficiency.
Test report: PDF
電路圖: PDF
參考設計

PMP7877 — 適用於 Xilinx® Zynq®-7000 的電源參考設計

The PMP7877 reference design provides all the rails necessary to power a Xilinx® Zynq®-7000 series SoC.  It operates from an input voltage range of 10.8Vin to 13.2Vin and has seven regulated outputs: 1Vout @ 5A, 1.8Vout @ 2.5A, 1.5Vout @ 6A, 3.3Vout @ 5A, 3.3Vout @ 5A, 5Vout @ 2A, and (...)
Test report: PDF
電路圖: PDF
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