EnpirionEP5368QI集成电感电源方案

Enpirion公司的EP5368QI是同步的降压转换器，它集成了电感，PWM控制器，MOSFET等，仅需要两个外接MLCC电容就可组成完整的电源解决方案。集成的电感大大地简化了设计，降低了噪声和元件数量以及占位面积。EP5368QI的工作频率为4 MHz，效率高达94%，可用100%的占空比，输出电流600 mA，主要应用在对噪声敏感的RF应用，面积受限制的地方，智能手机和PDA,手提游戏，个人媒体播放器以及高档移动处理器，DSP和多媒体引擎等。本文介绍了EP5368QI的主要性能，方框图以及应用电路。

600mA Synchronous Buck Regulator With Integrated Inductor 3mm x 3mm x 1.1mm Package
The EP5368QI is a synchronous buck converter with integrated Inductor, PWM
controller, MOSFETS, and Compensation providing the smallest possible solution size.
The EP5368QI requires only two small MLCC capacitors to make a complete solution.

Integration of the inductor greatly simplifies design, contains noise, reduces part count, and reduces solution footprint. Low output ripple ensures compatibility with RF systems.

The EP5368QI operates at a switching frequency of 4 MHz, enabling this unprecedented level of integration and small external components. Type III voltage mode control is used to provide high noise immunity  and wide control loop bandwidth. The device is stable over all input and output voltages . It can source 600mA of current over the industrial temperature range and up to 700mA over the commercial temperature range.

The small footprint makes this part ideal for space constrained portable applications.

Shutdown current of <1uA extends battery life Output voltage level is programmed via a 3-pin VID selector providing seven pre-programmed output voltages along with an option for external resistor divider.

主要特性：
Integrated Inductor
3mm x 3mm x 1.1mm QFN package
Only two low cost MLCC caps required
4 MHz switching frequency
High efficiency, up to 94%
Up to 700mA continuous output current
Wide 2.4V to 5.5V input range
VOUT Range 0.603V to VIN – 0.4V
100% duty cycle capable
Less than 1 μA standby current
Low VOUT ripple for RF compatibility
Short circuit and over current protection
UVLO and thermal protection
Stable over entire operating range
RoHS compliant; MSL 3 260°C reflow

主要应用：
Noise sensitive RF applications
Area constrained applications
Smart phones and PDAs
Portable gaming devices
Personal Media Players
Advanced Mobile Processors, DSP, IO,Memory, Video, Multimedia Engines



图1. EP5368QI功能方框图



图2. EP5368QI 700mA应用电路