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DC/DC 轉換器

LM20242

現行

具可調節頻率的 4.5-36V、2A 電流模式同步降壓穩壓器

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產品規格表

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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。
TLVM13620 現行 採用 4-mm x 6-mm x 1.8-mm 封裝的 3.6-V 至 36-V 輸入、1-V 至 6-V 輸出、2-A 降壓模組 Save board space, simplify design and speed time to market with an integrated-inductor power module.

LM20242

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 2 Vin (max) (V) 36 Vin (min) (V) 4.5 Vout (max) (V) 32 Vout (min) (V) 0.8 Features Enable, Overcurrent protection, Power good, Pre-bias startup, Synchronous rectification, Tracking Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.002 Duty cycle (max) (%) 90
Rating Catalog Topology Buck Iout (max) (A) 2 Vin (max) (V) 36 Vin (min) (V) 4.5 Vout (max) (V) 32 Vout (min) (V) 0.8 Features Enable, Overcurrent protection, Power good, Pre-bias startup, Synchronous rectification, Tracking Control mode current mode Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.002 Duty cycle (max) (%) 90
HTSSOP (PWP) 20 41.6 mm² (6.5 mm × 6.4 mm)
  • 2A Output Current, 3.7A Peak Current
  • 130 mΩ/110 mΩ Integrated Power MOSFETs
  • 1.5% Output Voltage Accuracy
  • Current Mode Control, Selectable Compensation
  • Resistor Programmed, 1MHz Capable Oscillator
  • Synchronous Rectifier with Diode Emulation
  • Adjustable Output Voltage Down to 0.8V
  • Compatible with Pre-Biased Loads
  • Programmable Soft-Start With External Capacitor
  • Precision Enable Pin with Hysteresis
  • OVP, UVLO Inputs and PGOOD Output
  • Internally Protected with Peak Current Limit, Thermal Shutdown and Restart
  • Accurate Current Limit with Frequency Foldback
  • Non-Linear Current Mode Slope Compensation
  • HTSSOP Exposed Pad Package

PowerWise is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

  • 2A Output Current, 3.7A Peak Current
  • 130 mΩ/110 mΩ Integrated Power MOSFETs
  • 1.5% Output Voltage Accuracy
  • Current Mode Control, Selectable Compensation
  • Resistor Programmed, 1MHz Capable Oscillator
  • Synchronous Rectifier with Diode Emulation
  • Adjustable Output Voltage Down to 0.8V
  • Compatible with Pre-Biased Loads
  • Programmable Soft-Start With External Capacitor
  • Precision Enable Pin with Hysteresis
  • OVP, UVLO Inputs and PGOOD Output
  • Internally Protected with Peak Current Limit, Thermal Shutdown and Restart
  • Accurate Current Limit with Frequency Foldback
  • Non-Linear Current Mode Slope Compensation
  • HTSSOP Exposed Pad Package

PowerWise is a trademark of Texas Instruments. All trademarks are the property of their respective owners.

The LM20242 is a full featured 1MHz capable synchronous buck regulator capable of delivering up to 2A of load current. The current mode control loop is externally compensated with only two external components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems.

The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated PGOOD circuit.

The LM20242 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20242 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20242 is offered in an exposed pad 20 pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.

The LM20242 is a full featured 1MHz capable synchronous buck regulator capable of delivering up to 2A of load current. The current mode control loop is externally compensated with only two external components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high voltage systems.

The device features internal Over Voltage Protection (OVP) and Over Current Protection (OCP) circuits for increased system reliability. A precision Enable pin and integrated UVLO allows the turn on of the device to be tightly controlled and sequenced. Startup inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated PGOOD circuit.

The LM20242 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20242 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20242 is offered in an exposed pad 20 pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.
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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 LM20242 36V, 2A PowerWise ® Adjustable Frequency Synchronous Buck Regulator datasheet (Rev. E) 2013/3/28
選擇指南 Power Management Guide 2018 (Rev. R) 2018/6/25
應用說明 AN-2077 LM20k POL Module (Rev. A) 2013/5/3
使用指南 LM20242 Demonstration Board User Guide 2012/1/27

設計與開發

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開發板

LM20242EVAL — 36V、2A PowerWise® 可調整頻率同步降壓穩壓器評估模組

The LM20242 synchronous rectifier Buck evaluation board is designed to provide the design engineer with a fully functional Buck power converter based on Current Mode Control to evaluate the LM20242 switching regulator IC. The evaluation board provides a 3.3V output with 2A current capability. The (...)

使用指南: PDF
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計算工具

LM20242DESIGN-CALC — LM20242 計算機試算表

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參考設計

PMP4494 — 具有 200mS 輸出電壓掉電保持時間電路的 5V 至 3.3V 1.2A DC-DC 轉換器參考設計

PMP4494 是具 Vout 保持電路的 5V 至 3.3V 1.2A DC-DC 轉換器。設計中使用同步降壓轉換器 LM20242 可確保系統電壓的高效率。升壓轉換器 TPS61170 可將輔助軌從 10V 升壓至最高 20V，以提供備用電壓。供應電壓監控器 TLV809 會監控系統電壓，並在系統電壓低於閾值電壓時將電源切換至備用電壓。除了升壓電路外，保持電容也可大幅減少，同時仍符合 200ms 的保持時間規格。
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HTSSOP (PWP) 20 Ultra Librarian
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