MCP1640CT-IMC datasheet(1/32 Pages) MICROCHIP

Il numero della parte	MCP1640CT-IMC

Spiegazioni elettronici	0.65V Start-Up Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option

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Produttore elettronici	MICROCHIP [Microchip Technology]

Homepage	http://www.microchip.com

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 2010-2015 Microchip Technology Inc.

DS20002234D-page 1

MCP1640/B/C/D

Features

• Up to 96% Typical Efficiency

• 800 mA Typical Peak Input Current Limit:

-IOUT > 100 mA @ 1.2V VIN, 3.3V VOUT

-IOUT > 350 mA @ 2.4V VIN, 3.3V VOUT

-IOUT > 350 mA @ 3.3V VIN, 5.0V VOUT

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

@ 1 mA

• Low Operating Input Voltage: 0.35V, typical

3.3VOUT @ 1 mA

• Adjustable Output Voltage Range: 2.0V to 5.5V

• Maximum Input Voltage

 V

OUT < 5.5V

• Automatic PFM/PWM Operation (MCP1640/C):

- PFM Operation Disabled (MCP1640B/D)

- PWM Operation: 500 kHz

• Low Device Quiescent Current: 19 µA, typical

PFM Mode (not switching)

• Internal Synchronous Rectifier

• Internal Compensation

• Inrush Current Limiting and Internal Soft Start

• Selectable, Logic Controlled Shutdown States:

- True Load Disconnect Option (MCP1640/B)

- Input to Output Bypass Option (MCP1640C/D)

• Shutdown Current (All States): < 1 µA

• Low Noise, Anti-Ringing Control

• Overtemperature Protection

• Available Packages:

- 6-Lead SOT-23

- 8-Lead 2 x 3 mm DFN

Applications

• One, Two and Three Cell Alkaline and NiMH/NiCd

Portable Products

• Single-Cell Li-Ion to 5V Converters

• Li Coin Cell Powered Devices

• Personal Medical Products

• Wireless Sensors

• Handheld Instruments

• GPS Receivers

• Bluetooth Headsets

• +3.3V to +5.0V Distributed Power Supply

General Description

The MCP1640/B/C/D is a compact, high-efficiency,

fixed frequency, synchronous step-up DC-DC con-

verter. It provides an easy-to-use power supply solution

for applications powered by either single-cell, two-cell,

or three-cell alkaline, NiCd, NiMH, and single-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 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 is integrated to

minimize the number of external components. For

standby applications, the MCP1640 consumes only

19 µA while operating at no load, and provides a true

disconnect from input to output while in Shutdown

(EN = GND). Additional device options are available by

operating in PWM-Only mode and connecting input to

output while the device is in Shutdown.

The “true” load disconnect mode provides input-to-out-

put isolation while the device is disabled by removing

the normal boost regulator diode path from input-to-

output. The Input-to-Output Bypass mode option con-

nects the input to the output using the integrated low

resistance P-Channel MOSFET, which provides a low

bias voltage for circuits operating in Deep Sleep mode.

Both options consume less than 1 µA of input current.

Output voltage is set by a small external resistor

divider. Two package options are available, 6-Lead

SOT-23 and 8-Lead 2 x 3 mm DFN.

Package Types

MCP1640

8-Lead 2 x 3 DFN*

PGND

SGND

EN

VOUTS

VOUTP

1

2

3

4

8

7

6

5 SW

VIN

VFB

EP

9

4

1

2

3

6 VIN

VFB

SW

GND

EN

5 VOUT

MCP1640

6-Lead SOT-23

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

0.65V Start-Up Synchronous Boost Regulator

with True Output Disconnect or Input/Output Bypass Option

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