LM3679 - 用于超低截面应用的 3MHz、350mA 微型降压 DC-DC 转换器

LM3679是TI德州仪器公司的一款转换器（集成开关）产品，LM3679是用于超低截面应用的 3MHz、350mA 微型降压 DC-DC 转换器，本站介绍了LM3679的封装应用图解、特点和优点、功能等，并给出了与LM3679相关的TI元器件型号供参考。

LM3679 - 用于超低截面应用的 3MHz、350mA 微型降压 DC-DC 转换器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The LM3679 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.5V to 5.5V. It provides up to 350mA load current, over the entire input voltage range. The LM3679 output voltage can be configured to 1.2V, 1.5V, or 1.8V.

The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode operation, the device operates at a fixed-frequency of 3 MHz (typ). PWM mode drives loads from ~ 80mA to 350mA max. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ) during light load and standby operation. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled low), the device turns off and reduces battery consumption to 0.01 µA (typ).

The LM3679 is available in a lead-free (No PB) 5-bump micro SMD package, 0.6mm height, and in an ultra thin 0.3mm height UR package. Using the UR package along with specific external components, allows for a low profile solution size with a max height of 0.55mm. A switching frequency of 3 MHz (typ) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required. .

产品特性

16 µA typical quiescent current

350 mA maximum load capability

3 MHz PWM fixed switching frequency (typ)

Automatic PFM/PWM mode switching

Available in 5-bump micro SMD package and UR package

Internal synchronous rectification for high efficiency

Internal soft start

0.01 µA typical shutdown current

Operates from a single Li-Ion cell battery

Current overload and Thermal shutdown protection

Three external components required for typical applications

Low profile solution (0.55mm max height, includes four external components)

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