RT8020裕鼎祥咨询电话：139 2843 4054
【RT8020】双路高效率、1.5MHz、1APWM降压型DC-DC变换器
【RT8020】概述
RT8020包含两路独立的1.5MHz固定频率、电流模、PWM降压型变换器。每一路均集成了主开关管和同步管以提高效率而无需外接肖特基二极管。【RT8020】适用于采用单节锂离子电池或3节NiMH/NiCd电池的便携系统。每一路可在2.5V到5.5V的输入电压范围下提供1A的输出电流。输出电压可低至0.6V。RT8020可提供100%占空比的低压降运行。
【RT8020】特点
效率高达96%
1.5MHz固定开关频率
每路高达1A的输出电流
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
电流模工作模式
短路保护
过温保护
关断电流＜1μA
带软启功能
TDFN-12封装
符合RoHS规范及Pb-Free
【RT8020】应用
蜂窝电话
微处理器和DSP电源
PDAs和便携媒体播放器
无线和DSL调制解调器
数码相机设备和摄影机
| RT8020 General Description |
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The RT8020 is a dual high-efficiency Pulse-Width-Modulated (PWM) step-down DC-DC converter. It is capable of delivering 1A output current over a wide input voltage range from 2.5V to 5.5V, the RT8020 is ideally suited for portable electronic devices that are powered from 1-cell Li-ion battery or from other power sources within the range such as cellular phones, PDAs and other hand-held devices.Two operational modes are available : PWM/Low-Dropout auto-switch and shutdown modes. Internal synchronous rectifier with low RDS(ON) dramatically reduces conduction loss at PWM mode. No external Schottky diode is required in practical application.The RT8020 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper PMOS. The RT8020 enter shutdown mode and consumes less than 0.1μA when EN pin is pulled low.The switching ripple is easily smoothed-out by small package filtering elements due to a fixed operation frequency of 1.5MHz. This along with small WDFN-12L 3x3 package provides small PCB area application. Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection, and over current protection. |
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RT8020 Ordering Info |
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Note : |
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RT8020 Features |
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• +2.5V to +5.5V Input Range
• Adjustable Output From 0.6V to VIN • 1.2V, 1.3V, 1.8V, 2.5V and 3.3V Fixed/ Adjustable Output Voltage • 1A Output Current • 95% Efficiency • No Schottky Diode Required • 50μA Quiescent Current per Channel • 1.5MHz Fixed-Frequency PWM Operation • Small 12-Lead WDFN Package • RoHS Compliant and 100% Lead (Pb)-Free |
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RT8020 Application |
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• Mobile Phones
• Personal Information Appliances • Wireless and DSL Modems • MP3 Players • Portable Instruments |
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RT8020 Pin Configurations |
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WDFN-12L 3x3 |
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RT8020 Typical Applications Circuit |
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Figure 1. Adjustable Voltage Regulator VOUTx = 1.2V, 1.3V, 1.8V, 2.5V or 3.3V Figure 2. Fixed Voltage Regulator |
