LM2642

現行

4.5-V 至 30-V,兩相峰值電流模式同步降壓控制器

現在提供此產品的更新版本

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功能與所比較的裝置相似
TPS51397A 現行 4.5-V 至 24-V 輸入、10-A 同步降壓穩壓器 Upgraded current rating with light-load efficiency and is soft start adjustable.

產品詳細資料

Vin (min) (V) 4.5 Vin (max) (V) 30 Iout (max) (A) 6 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Buck Rating Catalog Vout (min) (V) 1.238 Vout (max) (V) 27 Features Adjustable current limit, Enable, Phase Interleaving, Power good, Synchronous Rectification Iq (typ) (µA) 1000 Duty cycle (max) (%) 98 Number of phases 2
Vin (min) (V) 4.5 Vin (max) (V) 30 Iout (max) (A) 6 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Buck Rating Catalog Vout (min) (V) 1.238 Vout (max) (V) 27 Features Adjustable current limit, Enable, Phase Interleaving, Power good, Synchronous Rectification Iq (typ) (µA) 1000 Duty cycle (max) (%) 98 Number of phases 2
TSSOP (PW) 28 62.08 mm² 9.7 x 6.4
  • Two Synchronous Buck Regulators
  • 180° Out of Phase Operation
  • 4.5V to 30V Input Range
  • Power Good Function Monitors Ch.1
  • 37µA Shutdown Current
  • 0.04% (typical) Line and Load Regulation Error
  • Current Mode Control With or Without a Sense Resistor
  • Independent Enable/Soft-start Pins Allow Simple Sequential Startup Configuration.
  • Configurable for Single Output Parallel Operation.
  • Adjustable Cycle-by-Cycle Current Limit
  • Input Under-voltage Lockout
  • Output Over-voltage Latch Protection
  • Output Under-voltage Protection with Delay
  • Thermal Shutdown
  • Self Discharge of Output Capacitors When the Regulator is OFF
  • TSSOP package

All trademarks are the property of their respective owners.

  • Two Synchronous Buck Regulators
  • 180° Out of Phase Operation
  • 4.5V to 30V Input Range
  • Power Good Function Monitors Ch.1
  • 37µA Shutdown Current
  • 0.04% (typical) Line and Load Regulation Error
  • Current Mode Control With or Without a Sense Resistor
  • Independent Enable/Soft-start Pins Allow Simple Sequential Startup Configuration.
  • Configurable for Single Output Parallel Operation.
  • Adjustable Cycle-by-Cycle Current Limit
  • Input Under-voltage Lockout
  • Output Over-voltage Latch Protection
  • Output Under-voltage Protection with Delay
  • Thermal Shutdown
  • Self Discharge of Output Capacitors When the Regulator is OFF
  • TSSOP package

All trademarks are the property of their respective owners.

The LM2642 consists of two current mode synchronous buck regulator controllers with a switching frequency of 300kHz.

The two switching regulator controllers operate 180° out of phase. This feature reduces the input ripple RMS current, thereby significantly reducing the required input capacitance. The two switching regulator outputs can also be paralleled to operate as a dual-phase single output regulator.

The output of each channel can be independently adjusted from 1.3 to VIN• maximum duty cycle. An internal 5V rail is also available externally for driving bootstrap circuitry.

Current-mode feedback control assures excellent line and load regulation and a wide loop bandwidth for excellent response to fast load transients. Current is sensed across either the Vds of the top FET or across an external current-sense resistor connected in series with the drain of the top FET. Current limit is independently adjustable for each channel.

The LM2642 features analog soft-start circuitry that is independent of the output load and output capacitance. This makes the soft-start behavior more predictable and controllable than traditional soft-start circuits.

A PGOOD1 pin is provided to monitor the dc output of channel 1. Over-voltage protection is available for both outputs. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event.

The LM2642 consists of two current mode synchronous buck regulator controllers with a switching frequency of 300kHz.

The two switching regulator controllers operate 180° out of phase. This feature reduces the input ripple RMS current, thereby significantly reducing the required input capacitance. The two switching regulator outputs can also be paralleled to operate as a dual-phase single output regulator.

The output of each channel can be independently adjusted from 1.3 to VIN• maximum duty cycle. An internal 5V rail is also available externally for driving bootstrap circuitry.

Current-mode feedback control assures excellent line and load regulation and a wide loop bandwidth for excellent response to fast load transients. Current is sensed across either the Vds of the top FET or across an external current-sense resistor connected in series with the drain of the top FET. Current limit is independently adjustable for each channel.

The LM2642 features analog soft-start circuitry that is independent of the output load and output capacitance. This makes the soft-start behavior more predictable and controllable than traditional soft-start circuits.

A PGOOD1 pin is provided to monitor the dc output of channel 1. Over-voltage protection is available for both outputs. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event.

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類型 標題 日期
* Data sheet LM2642 Two-Phase Synchronous Step-Down Switching Controller datasheet (Rev. I) 2013年 4月 3日
User guide LM2642 Buck Controller Evaluation Module User's Guide (Rev. I) PDF | HTML 2022年 1月 25日
Selection guide Power Management Guide 2018 (Rev. R) 2018年 6月 25日
Analog Design Journal Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics 2016年 7月 21日
Analog Design Journal Controlling switch-node ringing in synchronous buck converters 2012年 4月 26日

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TSSOP (PW) 28 Ultra Librarian

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