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LR8421

更新时间： 2024-09-29 01:23:43
品牌 Logo 应用领域
乐山 - LRC /
页数 文件大小 规格书
7页 179K
描述
5A, 500KHz Synchronous Boost Converter with Output Disconnect

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LR8421 数据手册

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LESHAN RADIO COMPANY, LTD.  
5A, 500KHz Synchronous Boost Converter  
with Output Disconnect  
LR8421 Series  
„ INTRODUCTION:  
„ FEATURES:  
The LR8421 devices provide a power supply  
solution for products powered by either a one-cell  
Li-Ion or Li-polymer, or a two to three-cell alkaline,  
NiCd or NiMH battery. The converter generates a  
stable output voltage that is adjusted by an  
external resistor divider. It provides high efficient  
power conversion and is capable of delivering  
output currents up to 2.1A at 5V at a supply  
voltage down to 3V.  
The implemented boost converter is based on a  
fixed switching frequency (500kHz typical),  
current-mode controller using a synchronous  
rectifier to obtain maximum efficiency. Boost  
switch and rectifier switch are connected internally  
to provide the lowest leakage inductance and best  
EMI behavior possible. The current-mode control  
scheme provides fast transient response and  
good output voltage accuracy. At light load, the  
converter will automatically enter into Pulse  
Frequency Modulation (PFM) operation to reduce  
the dominant switching losses. During PFM  
operation, the IC consumes very low quiescent  
current and maintains high efficiency over a wide  
load current range.  
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Up to 90% Efficiency at IOUT=2A VOUT=5V  
from 3.3V Input  
Low Device Quiescent Current: 70ȝA (Max)  
Guaranteed 2.5A Output Current at VOUT=5V  
from 3.3V Input  
500kHz PWM Switching Frequency  
Synchronous and Embedded Power  
MOSFETs; No Schottky Diode Required  
Low RDS(ON) (main switch/synchronous switch)  
at 5.0V output: 35/42mohm  
Input Voltage Range: 1.8V to 5.25V  
Adjustable Output Voltage Range:  
from 2.5V to 5.5V  
Pulse Frequency Modulation Operation for  
Improved Efficiency at Low Output Power  
Current Mode Operation with Internal  
Compensation for Excellent Line and Load  
Transient Response  
Logic Controlled Shutdown(<1ȝA)  
Load Disconnect During Shutdown  
Automatic output discharge at shutdown:  
No output discharge function  
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Internal Soft-Start to Limit Inrush Current  
Over Current Protection  
Input Under Voltage Lockout  
Output Over Voltage Protection  
Over-Temperature Protection  
Available in thermally enhanced 8-pin SOP  
Package  
The converter can be disabled to minimize battery  
drain. During shutdown, the load is completely  
disconnected from the battery.  
The device allows use of small inductors and  
output capacitors for USB devices.  
„ APPLICATIONS˖  
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All Single Cell Li or Dual Cell Battery  
Operated Products as Tablet PC, Smartbook  
and Other Portable Equipment  
Products including portable HDMI and USB-OTG  
USB Hosts Without Native 5V Supplies  
USB Charging Port (5V)  
Power Bank, Battery Backup Units  
Wireless Peripherals  
Portable Audio Players  
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Personal Medical Devices  
Industrial Metering Equipments  
DC/DC Micro Modules  
1/7  
Ver0.1  
1234567

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