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DC/DC 轉換器

LM3674

現行

採用 SOT 23-5 的 2MHz、600mA 降壓 DC-DC 轉換器

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產品規格表

LM3674

現行
立即訂購

產品詳細資料

Rating Catalog Topology Buck Iout (max) (A) 0.6 Vin (max) (V) 5.5 Vin (min) (V) 2.7 Vout (max) (V) 3.3 Vout (min) (V) 1.1 Features Enable, Synchronous Rectification Control mode Voltage mode Operating temperature range (°C) -30 to 85 Iq (typ) (A) 0.0003 Duty cycle (max) (%) 100
Rating Catalog Topology Buck Iout (max) (A) 0.6 Vin (max) (V) 5.5 Vin (min) (V) 2.7 Vout (max) (V) 3.3 Vout (min) (V) 1.1 Features Enable, Synchronous Rectification Control mode Voltage mode Operating temperature range (°C) -30 to 85 Iq (typ) (A) 0.0003 Duty cycle (max) (%) 100
SOT-23 (DBV) 5 8.12 mm² (2.9 mm × 2.8 mm)
  • Input Voltage Range From 2.7 V to 5.5 V
  • 600-mA Maximum Load Current
  • Available in Fixed and Adjustable Output Voltages
    Ranging From 1 V to 3.3 V
  • Operates From a Single Li-Ion Cell Battery
  • Internal Synchronous Rectification for High
    Efficiency
  • Internal Soft-Start
  • 0.01-µA Typical Shutdown Current
  • 2-MHz PWM Fixed Switching Frequency (typical)
  • Current Overload Protection and Thermal
    Shutdown Protection
  • Input Voltage Range From 2.7 V to 5.5 V
  • 600-mA Maximum Load Current
  • Available in Fixed and Adjustable Output Voltages
    Ranging From 1 V to 3.3 V
  • Operates From a Single Li-Ion Cell Battery
  • Internal Synchronous Rectification for High
    Efficiency
  • Internal Soft-Start
  • 0.01-µA Typical Shutdown Current
  • 2-MHz PWM Fixed Switching Frequency (typical)
  • Current Overload Protection and Thermal
    Shutdown Protection

The LM3674 step-down DC-DC converter is optimized for powering low-voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 600-mA load current over the entire input voltage range. There are several fixed output voltages and adjustable output voltage versions.

The device offers superior features and performance for mobile phones and similar portable systems. During the Pulse Width Modulation (PWM) mode, the device operates at a fixed-frequency of 2 MHz (typical). Internal synchronous rectification provides high efficiency during the PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typical).

The LM3674 is available in a 5-pin SOT-23 package. A high switching frequency of 2 MHz (typical) allows use of only three tiny external surface-mount components, an inductor and two ceramic capacitors.

The LM3674 step-down DC-DC converter is optimized for powering low-voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 600-mA load current over the entire input voltage range. There are several fixed output voltages and adjustable output voltage versions.

The device offers superior features and performance for mobile phones and similar portable systems. During the Pulse Width Modulation (PWM) mode, the device operates at a fixed-frequency of 2 MHz (typical). Internal synchronous rectification provides high efficiency during the PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typical).

The LM3674 is available in a 5-pin SOT-23 package. A high switching frequency of 2 MHz (typical) allows use of only three tiny external surface-mount components, an inductor and two ceramic capacitors.

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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 LM3674 2-MHz, 600-mA Step-Down DC-DC Converter in SOT-23 datasheet (Rev. G) PDF | HTML 2015/4/24
應用說明 Quick Reference Guide To TI Buck Switching DC/DC Application Notes (Rev. B) PDF | HTML 2022/5/23
設計指南 2-Port USB 3.0 Hub (TIDA-00287) 2014/8/1

設計與開發

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參考設計

TIDA-00287 — 雙埠 USB 3.0 集線器參考設計

此經過驗證的參考設計為一款符合 USB 3.0 標準的二埠集線器。  其可同時在上游埠提供 SuperSpeed 與高速/全速連線，並可在下游埠提供 SuperSpeed、高速、全速或低速連線。

集線器設計可為每個下游埠提供電源控制，以及過電流保護和 ESD 防護。

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