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LR8425AQD10 PDF预览

LR8425AQD10

更新时间： 2024-11-21 01:14:35
品牌 Logo 应用领域
乐山 - LRC /
页数 文件大小 规格书
7页 164K
描述
5A, 500KHz Synchronous Boost Converter with Output Disconnect

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LR8425AQD10 数据手册

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LESHAN RADIO COMPANY, LTD.  
5A, 500KHz Synchronous Boost Converter  
with Output Disconnect  
LR8425 Series  
„ INTRODUCTION:  
„ FEATURES:  
The /58425 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  
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97% Efficiency at VOUT=5V from 3.3V Input  
Device Quiescent Current: 37μA (Typ)  
Guaranteed 2.5A Output Current at VOUT=5V  
from 3.3V Input  
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  
1.5A at 5V at a supply voltage down to 2V.  
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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500kHz PWM Switching Frequency  
Synchronous and Embedded Power  
MOSFETs, No Schottky Diode Required  
Low RDS(ON) (main switch/synchronous switch)  
at 5.0V output: 20/40mohm  
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(<1μA)  
Load Disconnect During Shutdown  
Automatic output discharge at shutdown:ꢀ  
/58425A: Auto output discharge functionꢀ  
/58425B: No output discharge function  
Low Battery Comparator  
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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  
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.  
Available in 2.1mm x 2.1mm QFN10 Package  
„ 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  
Personal Medical Devices  
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Industrial Metering Equipments  
DC/DC Micro Modules  
1/7  
Ver0.5  
1234567

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