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LM3674

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采用 SOT 23-5 封装的 2MHz、600mA 降压直流/直流转换器

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LM3674

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产品详情

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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技术文档

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顶层文档 类型 标题 格式选项 下载最新的英语版本 日期
* 数据表 LM3674 2-MHz, 600-mA Step-Down DC-DC Converter in SOT-23 数据表 (Rev. G) PDF | HTML 2015-4-24
应用手册 TI 降压开关直流/直流转换器应用手册的快速参考指南 (Rev. B) PDF | HTML 英语版 (Rev.B) PDF | HTML 2022-7-8
设计指南 2-Port USB 3.0 Hub (TIDA-00287) 2014-8-1
应用手册 Application Note 1427 LM3674 Evaluation Board (cn) 2008-10-14

设计与开发

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参考设计

TIDA-00287 — 2 端口 USB 3.0 集线器参考设计

此验证参考设计是一款符合 USB 3.0 标准的双端口集线器。  在上行端口上可提供同步超快速和高速/全速连接，在下行端口上可提供超快速、高速、全速或者低速连接。

集线器设计可为每个下行端口提供电源控制以及过流保护和 ESD 保护。

支持的产品和硬件
封装 引脚 CAD 符号、封装和 3D 模型
SOT-23 (DBV) 5 Ultra Librarian
适用于评估类项目的 TI 标准条款与条件。

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