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发布者:来自网络 发布时间:2013/12/19 阅读:4291次    关键字: DC-DC
EUP2412-500KHz同步升压转换器/600mA低噪声LDO


EUP2412-500KHz同步升压转换器/600mA低噪声LDO DataSheet 

概述

    EUP2412内部集成了一个500KHz高效、同步升压转换器和一个高PSRR、低噪声、快速瞬态响应低压降线性稳压器(LDO),二者完全独立控制。2.2V~5.5V的输入电压范围,使此器件适用于2节NiMH/NiCd电池或者是1节Li-ion电池的应用环境。
EUP2412 Boost具有500KHz的工作频率,允许客户使用较小的外围器件,从而节约板上空间。片内同时集成两个同步整流管,极大的提高了此IC峰值效率。内部补偿和软启动功能更进一步减少外围器件并限制启动时的电流过冲。在关断模式下,该转换器能实现输入、输出完全断开,负载输出电流<0.1uA。
    EUP2412 LDO具有高精度、极低压降、低静态电流、启动快等特点,提供高达600mA电流的输出能力;为了方便客户应用,并提供独立的输入电源引脚。 同时,此LDO采用低ESR的陶瓷电容来减小PCB的面积,一个2.2uF的陶瓷电容就足以保证LDO在整个负载范围内的稳定工作。
通过BYPASS外接旁路电容以获得高PSRR、低噪声。另外,根据客户需求,输出电压可以在出场前预设为1.2V、1.8V、2.5V或3.3V。
    EUP2412采用3mm×3mm TDFN10封装。

特点

•  宽输入电压:2.2V~5.5V
•  LDO输出电流高达600mA
•  300mV@600mA压降
•  1.2V~3.6V输出电压精度:2%
•  优异的瞬态响应
•  高PSRR:70dB@1kHz
•  2.2uF陶瓷输出电容保证芯片稳定工作
•  关短时输出电容自动放电
•  1.6A电流极限
•  500KHz工作频率
•  实现输入、输出完全断开
•  同步整流管内置
•  软启动内置
•  集成过温关断保护
•  符合RoHS规范及无铅封装
•  3mm×3mm TDFN10封装

应用

•  便携式多媒体播放器
•  移动电话
•  蓝牙式便携收音机及附件
•  电池供电设备


EUP2412-500kHz Synchronous Step-Up Converter / 600mA Low Noise LDO 

Description
The EUP2412 provides a high efficiency 500kHz synchronous step-up converter and a low noise, high PSRR, low dropout (LDO) fixed output linear regulator with independent enable pins. EUP2412 input voltage range is 2.2V to 5.5V, making it ideal for applications with either a 2-cell NiMH/NiCd or a single-cell lithium-ion/polymer batteries.
The EUP2412 500kHz fixed frequency synchronous step-up converter uses smaller external components producing a compact solution for a wide range of load currents. Integrated N-Channel main switch and P-Channel synchronous rectifier greatly improve converter efficiency. Internal soft-start function reduces inrush current. The EUP2412 synchronous step-up
convert regulates the output voltage up to 6V. When the synchronous step-up convert is disabled, the internal conduction path from SW to OUT is fully blocked. This output disconnect feature isolates the output from the input and reduces the shutdown current less than 0.1µA.
The EUP2412 LDO linear regulator has an independent input supply pin and is capable of delivering up to 600mA load current. It offers high output accuracy, extremely low dropout voltage, low quiescent current and fast start-up time. LDO is designed to work with low-ESR ceramic capacitors. Only a 2.2uF ceramic output capacitor can make the device stable over the entire load range.
Optionally connecting a capacitor from BYPASS pin to GND gets high PSRR. The EUP2412 LDO output voltage is factory pre-set 1.2V, 1.8V, 2.5V, 2.8V or 3.3V.
The EUP2412 is available in a 10pin 3mm × 3mm TDFN-10 package.

Feature
• Wide Input Voltage Range: 2.2V to 5.5V
• 600mA LDO Output Current
• 300mV Dropout Voltage at 600mA
• LDO Output Voltage With: 2% Initial Accuracy Fixed Output Voltage: 1.2V to 3.6V
• Fast LDO Line / Load Transient Response
• LDO 70dB PSRR at 1kHz
• LDO Stable with a 2.2uF Ceramic Output Capacitor
• LDO Output is Discharged to GND in Shutdown
• Step-up Converter with 1.6Amp Peak Current Limit
• 500kHz Fixed Switching Frequency
• Step-up Converter Output is Disconnected from the Input in Shutdown
• Built-in Main Switch and Synchronous Rectifier
• Internal Soft-Start
• Thermal Shutdown
• RoHS Compliant and 100% Lead (Fb)-Free
• Available in TDFN33-10 Package

Application
• Portable Media Players
• Cellular Phones
• Bluetooth portable radios and Accessories
• Battery-Powered Equipments

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