ホーム パワー・マネージメント AC/DC と DC/DC の各コントローラ (外部 FET)

プリバイアス・スタートアップと、オプションのクロック同期機能搭載、1V ~ 14V、電圧モード、同期整流降圧コントローラ

この製品には新バージョンがあります。

open-in-new 代替品と比較
比較対象デバイスと類似の機能
TPS546A24A アクティブ ピン・ストラップ機能搭載、PMBus 対応、2.95V ~ 18V、スタッカブル 10A、同期整流SWIFT™ 降圧コンバータ Upgraded PMBus and faster switching frequency.

製品詳細

Vin (min) (V) 1 Vin (max) (V) 14 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Topology Buck Rating Catalog Vout (min) (V) 0.6 Vout (max) (V) 12 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Iq (typ) (µA) 1700 Duty cycle (max) (%) 86 Number of phases 1
Vin (min) (V) 1 Vin (max) (V) 14 Iout (max) (A) 20 Operating temperature range (°C) -40 to 125 Topology Buck Rating Catalog Vout (min) (V) 0.6 Vout (max) (V) 12 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Iq (typ) (µA) 1700 Duty cycle (max) (%) 86 Number of phases 1
TSSOP (PW) 14 32 mm² 5 x 6.4
  • ±1% Feedback Voltage Accuracy Over Temperature
  • Switching Frequency from 50 kHz to 1 MHz
  • Switching Frequency Synchronize Range 250 kHz to 1 MHz
  • Startup with a Pre-Biased Output Load
  • Power Stage Input Voltage from 1V to 14V
  • Control Stage Input Voltage from 3V to 6V
  • Output Voltage Adjustable Down to 0.6V
  • Power Good Flag and Shutdown
  • Output Overvoltage and Undervoltage Detection
  • Low-Side Adjustable Current Sensing
  • Adjustable Soft-Start
  • Tracking and Sequencing with Shutdown and Soft Start Pins
  • 14-Pin TSSOP Package

All trademarks are the property of their respective owners.

  • ±1% Feedback Voltage Accuracy Over Temperature
  • Switching Frequency from 50 kHz to 1 MHz
  • Switching Frequency Synchronize Range 250 kHz to 1 MHz
  • Startup with a Pre-Biased Output Load
  • Power Stage Input Voltage from 1V to 14V
  • Control Stage Input Voltage from 3V to 6V
  • Output Voltage Adjustable Down to 0.6V
  • Power Good Flag and Shutdown
  • Output Overvoltage and Undervoltage Detection
  • Low-Side Adjustable Current Sensing
  • Adjustable Soft-Start
  • Tracking and Sequencing with Shutdown and Soft Start Pins
  • 14-Pin TSSOP Package

All trademarks are the property of their respective owners.

The LM2747 is a high-speed synchronous buck regulator controller with a feedback voltage accuracy of ±1%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control section of the IC is rated for 3 to 6V, the driver section is designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the more cost-effective option of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the low-side switch voltage drop for providing a simple, adjustable current limit.

The LM2747 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In addition, the LM2747 also allows the switching frequency to be synchronized to an external clock signal over the range of 250 kHz to 1 MHz. This wide range of switching frequency gives the power supply designer the flexibility to make better tradeoffs between component size, cost and efficiency.

Features include the ability to startup with a pre-biased load on the output, soft-start, input undervoltage lockout (UVLO) and Power Good (based on both undervoltage and overvoltage detection). In addition, the shutdown pin of the IC can be used for providing startup delay, and the soft-start pin can be used for implementing precise tracking, for the purpose of sequencing with respect to an external rail.

The LM2747 is a high-speed synchronous buck regulator controller with a feedback voltage accuracy of ±1%. It can provide simple down conversion to output voltages as low as 0.6V. Though the control section of the IC is rated for 3 to 6V, the driver section is designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for the more cost-effective option of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the low-side switch voltage drop for providing a simple, adjustable current limit.

The LM2747 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with one external resistor. In addition, the LM2747 also allows the switching frequency to be synchronized to an external clock signal over the range of 250 kHz to 1 MHz. This wide range of switching frequency gives the power supply designer the flexibility to make better tradeoffs between component size, cost and efficiency.

Features include the ability to startup with a pre-biased load on the output, soft-start, input undervoltage lockout (UVLO) and Power Good (based on both undervoltage and overvoltage detection). In addition, the shutdown pin of the IC can be used for providing startup delay, and the soft-start pin can be used for implementing precise tracking, for the purpose of sequencing with respect to an external rail.

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種類 タイトル 最新の英語版をダウンロード 日付
* データシート LM2747 Synch Buck Cntrlr w/Pre-bias Startup 7 Optional Clk Synch データシート (Rev. B) 2013年 3月 28日

購入と品質

記載されている情報:
  • RoHS
  • REACH
  • デバイスのマーキング
  • リード端子の仕上げ / ボールの原材料
  • MSL 定格 / ピーク リフロー
  • MTBF/FIT 推定値
  • 使用原材料
  • 認定試験結果
  • 継続的な信頼性モニタ試験結果
記載されている情報:
  • ファブの拠点
  • 組み立てを実施した拠点

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