Microchip MCP1642 Handleiding

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 2014 Microchip Technology Inc.DS20005253A-page 1

MCP1642B/D

Features

•Up to 96% Typical Efficiency

•1.8A Typical Peak Input Current Limit:

- IOUT > 175mA @ 1.2V VIN, 3.3V VOUT

- IOUT > 600mA @ 2.4V VIN, 3.3V VOUT

- IOUT > 800mA @ 3.3V VIN, 5.0V VOUT

- IOUT > 1A @ VIN > 3.6V, 5.0V VOUT

•Low Start-Up Voltage: 0.65V, typical 3.3V V

OUT

@ 1 mA

•Low Operating Input Voltage: 0.35V, typical 3.3V

VOUT @ 1mA

•Output Voltage Range:

-Reference Voltage, VFB = 1.21V

-1.8V to 5.5V for the adjustable device option

-1.8V, 3.0V, 3.3V and 5.0V for fixed V

OUT

options

•Maximum Input Voltage VOUT < 5.5V

•PWM Operation: 1MHz

-Low Noise, Anti-Ringing Control

•Power Good Open-Drain Output

•Internal Synchronous Rectifier

•Internal Compensation

•Inrush Current Limiting and Internal Soft-Start

•Selectable, Logic-Controlled Shutdown States:

-True Load Disconnect Option (MCP1642B)

-Input-to-Output Bypass Option (MCP1642D)

•Shutdown Current (All States): 1 µA

•Overtemperature Protection

•Available Packages:

-8-Lead MSOP

-8-Lead 2x3 DFN

Applications

•One, Two and Three-Cell Alkaline, Lithium

Ultimate and NiMH/NiCd Portable Products

•Single-Cell Li-Ion to 5V Converters

• PIC® MCU Power

•USB Emergency Backup Charger from Batteries

•Personal Medical Products

•Wireless Sensors

•Hand-Held Instruments

•GPS Receivers

•+3.3V to +5.0V Distributed Power Supply

General Description

The MCP1642B/D devices are compact,

high-efficiency, fixed-frequency, synchronous step-up

DC-DC converters. This family of devices provides an

easy-to-use power supply solution for applications

powered by either one-cell, two-cell, or three-cell

alkaline, Ultimate Lithium, NiCd, NiMH, one-cell Li-Ion

or Li-Polymer batteries.

Low-voltage technology allows the regulator to start-up

without high inrush current or output voltage overshoot

from a low voltage 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 the number of external

components. An open-drain Power Good output is

provided to indicate when the output voltage is within

10% of regulation and facilitates the interface with an

MCU. For standby applications, MCP1642B provides a

“true output disconnect” from input to output while in

shutdown (EN = GND). An additional device option

(MCP1642D) is available and connects “input to output

bypass” while in shutdown. Both options consume less

than 1µA of input current.

For the adjustable (ADJ) device options, the output

voltage is set by a small external resistor divider. Fixed

VOUTdevice options do not require external divider

resistors. Two package options, 8-lead MSOP and 8-

lead 2x3 DFN, are available.

Package Types

PG

NC

VOUT

SGND

PGND

1

2

3

4

8

7

6

5SW

VIN

EN

EP

9

PGND

SGND

PG

VFB

VOUT

SGND

PGND

1

2

3

4

8

7

6

5 SW

VIN

EN

EP

9

6

1

2

3

8VIN

PGND

EN

VFB

PG

7SGND

5

4SW

VOUT

6

1

2

3

8VIN

EN

NC

PG

7

5

4 SWVOUT

MCP1642B/D-xx

MSOP

MCP1642B/D-xx

2x3 DFN*

MCP1642B/D-ADJ

MSOP

MCP1642B/D-ADJ

2x3 DFN*

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

1.8A Input Current Switch, 1MHz Low-Voltage Start-Up

Synchronous Boost Regulator

Product specificaties