Datasheet > MCP1643-I/MS

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

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中文翻译

获取价格

技术参数
数据手册

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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：	EAR99	HTS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：	40	Base Number Matches：	1

MCP1643-I/MS 数据手册

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

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 < V_LED< 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:

- V_FB= 120 mV

- Minimal Power Loss on Sense Resistor

• Pulse-Width Modulation Mode Operation (1 MHz)

• Internal Synchronous Rectifier

• Internal Compensation

The internal feedback (V_FB) 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

MSOP-8

2x3 DFN*

• General LED constant current applications

V_IN

V_FB

S_GND

_FB2

P_GND

V_OUT

P_GND

V_OUT

* Includes Exposed Thermal Pad (EP), see Table 3-1.

 2013 Microchip Technology Inc.

DS20005208A-page 1

12 3 4 5 6 7...32

中文翻译

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