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LR8406

更新时间： 2024-11-17 01:06:51
品牌 Logo 应用领域
乐山 - LRC /
页数 文件大小 规格书
22页 618K
描述
1.2A, 1.2MHz Synchronous Boost Converter with Output Disconnect

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LR8406 数据手册

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LESHAN RADIO COMPANY, LTD.  
1.2A, 1.2MHz Synchronous Boost Converter  
with Output Disconnect  
/5ꢀꢁꢂꢃ Series  
„ INTRODUCTION:  
„ FEATURES:  
The /5ꢀꢁꢂꢃ devices provide a power supply  
solution for products powered by either a one-cell,  
two-cell, or three-cell alkaline, NiCd or NiMH, or  
one-cell Li-ion or Li-polymer battery. The boost  
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Up to 96% Efficiency  
True Output Load Disconnect During  
Shutdown  
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Delivers 100mA@3.3V from Single AA Cell  
Delivers 300mA@5V from Two AA Cells  
Delivers 600mA@5V from Single Li Cell  
Low Voltage Start-Up: 0.85V  
Continuous Switching at Light Loads  
Internal Synchronous Rectifier  
Current Mode Control  
converter is based on  
a
fixed frequency,  
pulse-width-modulation (PWM) controller using a  
synchronous rectifier to obtain maximum efficiency,  
which contain an internal NMOS switch and  
PMOS synchronous rectifier. The maximum peak  
current in the boost switch is typically limited to a  
value of 1.2A.  
with Internal Compensation  
A switching frequency of 1.2MHz minimizes  
solution footprint by allowing the use of tiny, low  
profile inductors and ceramic capacitors. The  
current mode PWM design is internally  
compensated, reducing external parts count.  
Anti-ringing control circuitry reduces EMI concerns  
by damping the inductor in discontinuous mode.  
The converter can be disabled to minimize battery  
drain. During shutdown, the load is completely  
disconnected from the battery. The device  
features low shutdown current less than 1ȝA.  
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1.2MHz Fixed Frequency Switching  
Input Range: 0.5V to 4.5V  
Output Range: 2.5V to 4.3V (Up to 5.5V with  
Schottky)  
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Logic Controlled Shutdown(<1ȝA)  
Anti-ringing Control Minimizes EMI  
1.2A Peak Switch Current Limit  
Over Temperature Protection  
Tiny External Components  
Low Profile (1mm) SOT-23 Package  
„ APPLICATIONS˖˖  
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Digital Still and Video Cameras  
Portable Applications Using Single Li+ Cell  
Bus Powered USB Hosts  
USB Hosts Without Native 5-V Supplies  
Portable Audio Players  
LCD Bias Supplies White LED Lighting  
Wireless Handsets  
GPS Receivers  
Personal Medical Products  
9HUꢀꢁꢂ  
ꢃꢄꢂꢂ  
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