MCP1640T-IMC datasheet(1/32 Pages) MICROCHIP

Part #	MCP1640T-IMC

Description	0.65V Start-up Synchronous Boost Regulator with True Output Disconnect or Input/Output Bypass Option

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Manufacturer	MICROCHIP [Microchip Technology]

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 2010 Microchip Technology Inc.

DS22234A-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

• 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:

-SOT23-6

- 2x3 8-Lead 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 one-cell, two-cell, or

three-cell alkaline, 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 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.

For

standby

applications, the MCP1640 operates and consumes

only 19 µA while operating at no load and provides a

true disconnect from input to output while shut down

(EN = GND). Additional device options are available

that operate in PWM only mode and connect input to

output bypass while shut down.

A “true” load disconnect mode provides input to output

isolation while disabled by removing the normal boost

regulator diode path from input to output. A bypass

mode option connects the input to the output using the

integrated low resistance P-Channel MOSFET, which

provides a low bias keep alive 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, SOT23-6 and 2x3

DFN-8, are available.

Package Types

MCP1640

2x3 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 SOT23

* 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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