MCP1643 datasheet(1/28 Pages) MICROCHIP

номер детали	MCP1643

подробное описание детали	1 MHz Low Start-up Voltage Synchronous Boost LED Constant Current Regulator

PDF	28 Pages

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производитель	MICROCHIP [Microchip Technology]

домашняя страница	http://www.microchip.com

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 2013-2023 Microchip Technology Inc. and its subsidiaries

DS20005208B-page 1

MCP1643

Features

• Passes Automotive AEC-Q100 Reliability Testing

• 1.6A Typical Peak Input Current Limit

• Up to 550 mA LED Load Current

• 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

- 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

• Inrush Current Limiting

• Internal Soft-Start (240 µs typical)

• Shutdown (EN = GND):

- True Load Disconnect

- Dimming Control by Variable Duty Cycle

• Shutdown Current: 1.2 µA (typical)

• Overtemperature Protection

• Packages:

- MSOP-8

- 2 mm x 3 mm DFN-8

Applications

• One and Two Cell Alkaline and NiMH/NiCd

Portable LED Lighting Products

• LED Flashlight and Head Lamps

• Rechargeable Flashlights

• Wall LED Lamps with Motion Detectors

• LED supply for backlights

• General LED constant current applications

Description

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-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.

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.

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.

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.

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.

The device also features a thermal shutdown at

+150°C with +25°C hysteresis.

Two package options, MSOP-8 and 2 mm x 3 mm

DFN-8, are available.

The MCP1643 is AEC-Q100 qualified for automotive

applications.

Package Types

MCP1643

2x3 DFN*

NC

VFB

VOUT

SGND

PGND

1

2

3

4

8

7

6

5 SW

VIN

EN

EP

9

6

1

2

3

8 VIN

PGND

EN

VFB

NC

7 SGND

MCP1643

MSOP-8

5

4

SW

VOUT

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

1 MHz Low Start-up Voltage Synchronous Boost

LED Constant Current Regulator

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