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MCP1643-I/MS PDF预览

MCP1643-I/MS

更新时间: 2024-11-16 14:53:15
品牌 Logo 应用领域
美国微芯 - MICROCHIP 开关
页数 文件大小 规格书
32页 723K
描述
SWITCHING REGULATOR

MCP1643-I/MS 技术参数

是否Rohs认证: 符合生命周期:Active
包装说明:,Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:1.67模拟集成电路 - 其他类型:SWITCHING REGULATOR
JESD-609代码:e3湿度敏感等级:1
峰值回流温度(摄氏度):260端子面层:Matte Tin (Sn) - annealed
处于峰值回流温度下的最长时间:40Base Number Matches:1

MCP1643-I/MS 数据手册

 浏览型号MCP1643-I/MS的Datasheet PDF文件第2页浏览型号MCP1643-I/MS的Datasheet PDF文件第3页浏览型号MCP1643-I/MS的Datasheet PDF文件第4页浏览型号MCP1643-I/MS的Datasheet PDF文件第5页浏览型号MCP1643-I/MS的Datasheet PDF文件第6页浏览型号MCP1643-I/MS的Datasheet PDF文件第7页 
MCP1643  
1 MHz Low Start-up Voltage Synchronous Boost  
LED Constant Current Regulator  
Features  
Description  
• 1.6A Typical Peak Input Current Limit  
• Up to 550 mA LED Load Current  
MCP1643 is  
a
compact, high-efficiency, fixed  
frequency, synchronous step-up converter optimized to  
drive one LED with constant current, that operates from  
one and two-cell alkaline and NiMH/NiCd batteries.  
The device can also drive two red/green/yellow series  
connection LEDs.  
• Low Start-up Voltage: 0.65V (typical, 25 mA LED  
Current)  
• Low Operating Input Voltage: down to 0.5V  
• Maximum Input Voltage < VLED < 5.0V  
• Maximum Output Voltage:  
- 5.0V  
Low-voltage technology allows the regulator to start up  
without high-output voltage and load-current overshoot  
from a low 0.65V input. High efficiency is accomplished  
by integrating the low resistance N-Channel Boost  
switch and synchronous P-Channel switch. All  
compensation and protection circuitry are integrated to  
minimize external components.  
- Overvoltage Protection  
• Low Reference Voltage:  
- VFB = 120 mV  
- Minimal Power Loss on Sense Resistor  
• Pulse-Width Modulation Mode Operation (1 MHz)  
• Internal Synchronous Rectifier  
• Internal Compensation  
The internal feedback (VFB) voltage is set to 120 mV for  
low power dissipation when sensing and regulating  
LED current. A single resistor sets the constant current  
output that drives the LED load.  
• Inrush Current Limiting  
The device features an output overvoltage protection  
that limits the output voltage to 5.0V typical, in case the  
LED fails or output load is disconnected.  
• Internal Soft-Start (240 µs typical)  
• Shutdown (EN = GND):  
- True Load Disconnect  
The LED will either be turned OFF or turned ON using  
the enable input. A True Output Load Disconnect mode  
provides input-to-output isolation while Shutdown  
(EN = GND) by removing the normal boost regulator  
diode path from input to output. Shutdown state  
consumes 1.2 µA from input at room temperature.  
- Dimming Control by Variable Duty Cycle  
• Shutdown Current: 1.2 µA (typical)  
• Overtemperature protection  
• Packages:  
- MSOP-8  
The LED can be turned on and off with a variable duty  
cycle pulse-width modulation (PWM) signal applied to  
the EN pin for dimming applications.  
- 2x3 DFN-8  
Applications  
The device also features a thermal shutdown at  
+150°C, with +25°C hysteresis.  
• One and Two Cell Alkaline and NiMH/NiCd  
Portable LED Lighting Products  
Two package options, MSOP-8 and 2x3 DFN-8, are  
available.  
• LED Flashlight and Head Lamps  
• Rechargeable Flashlights  
Package Types  
• Wall LED Lamps with Motion Detectors  
• LED supply for backlights  
MCP1643  
MCP1643  
MSOP-8  
2x3 DFN*  
• General LED constant current applications  
VIN  
EN  
1
8
7
6
5
EN  
VIN  
1
8
VFB  
SGND  
2
3
4
7
6
5
SGND  
EP  
9
V
FB 2  
NC  
PGND  
SW  
3
4
NC  
VOUT  
PGND  
SW  
VOUT  
* Includes Exposed Thermal Pad (EP), see Table 3-1.  
2013 Microchip Technology Inc.  
DS20005208A-page 1  

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