EUP3080-1.5MHz,1A带软启功能的同步降压型变换器  DataSheet
概述
EUP3080是一款采用固定频率，电流模，PWM架构的降压型变换器。该芯片集成了主开关管和同步管以提高效率。2.5V到5.5V的输入电压范围使得EUP3080适用于采用单节锂离子电池或3节NiMH/NiCd电池的便携系统。输出电压可低至0.6V。EUP3080可提供1A的输出电流，并可提供100%占空比的低压降运行，延长了电池在便携系统中的寿命。
开关频率在内部被设定为1.5MHz，因此可使用小型表面贴装电感器和电容器。内置同步管提高了效率且不需要外接肖特基二极管。EUP3080可采用TDFN-6或者SOT23-5封装。
特点
• 效率高达96%
• 内部集成低RDSON的开关管：
上管：280mΩ
下管：200mΩ
• 1.5MHz固定开关频率
• 高达1A的输出电流
• 典型90µA静态电流
• 2.5V至5.5V的输入电压范围
• 低至0.6V的可调输出电压
• 100%占空比低压降工作
• 短路和过温保护
• 带软启功能
• 过压保护
• TDFN-6和SOT23-5封装
• 符合RoHS规范及Pb-Free
应用
• 蜂窝电话
• 便携媒体播放器/MP3播放器
• 数码相机设备和摄影机
• 便携仪器
• PC设备
EUP3080-1.5MHz,1A Synchronous Step-Down Converter with Soft Start
Description
The EUP3080 is a constant frequency, current mode, PWM step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency. The 2.5V to 5.5V input voltage range makes the EUP3080 ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery or 3-cell NiMH/ NiCd batteries. The output voltage can be regulated as low as 0.6V. The EUP3080 supports up to 1A load current and can also run at 100% duty cycle for low dropout applications, extending battery life in portable systems.
Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency while eliminates the need for an external Schottky diode. The EUP3080 is available in TDFN-6 and SOT23-5 Packages.
Feature
• High Efficiency up to 96%
• Low RDSON for internal switches:
High-side:280mΩ
Low-side:200mΩ
• 1.5MHz Constant Switching Frequency
• 1A Available Load Current
• 90μA Typical Quiescent Current
• 2.5V to 5.5V Input Voltage Range
• Adjustable Output Voltage as Low as 0.6V
• 100% Duty Cycle Low Dropout Operation
• Short Circuit and Thermal Protection
• Soft Start Function
• Over Voltage Protection
• Available in TDFN-6 and SOT23-5 Packages
• RoHS Compliant and 100% Lead(Pb)-Free Halogen-Free
Application
• Cellular and Smart Phones
• Portable Media Players/ MP3 Players
• Digital Still and Video Cameras
• Portable Instruments
• WLAN PC Cards |