Datasheet > LR8421

LR8421

更新时间： 2024-10-30 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

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.

Up to 90% Efficiency at I_OUT=2A V_OUT=5V

from 3.3V Input

Low Device Quiescent Current: 70ȝA (Max)

Guaranteed 2.5A Output Current at V_OUT=5V

from 3.3V Input

500kHz PWM Switching Frequency

Synchronous and Embedded Power

MOSFETs; No Schottky Diode Required

Low R_DS(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

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˖

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

Industrial Metering Equipments

DC/DC Micro Modules

1/7

Ver0.1

12 3 4 5 6 7

中文翻译

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与LR8421相关器件

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LR8421AES	LRC	获取价格	5A, 500KHz Synchronous Boost Converter with Output Disconnect
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LR8425AQD10	LRC	获取价格	5A, 500KHz Synchronous Boost Converter with Output Disconnect
LR8425BQD10	LRC	获取价格	5A, 500KHz Synchronous Boost Converter with Output Disconnect
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