MCP1640B-I View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

MCP1640B-I

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

Microchip Technology 

MCP1640/B/C/D

6.0 TYPICAL APPLICATION CIRCUITS

L1

4.7 µH

MANGANESE LITHIUM

DIOXIDE BUTTON CELL

+

2.0V TO 3.2V

-

CIN

4.7 µF

FROM PIC® MCU I/O

SW VOUT

VIN

EN

VFB

GND

VOUT

5.0V @ 5 mA

976 K

309 K

COUT

10 µF

Note:

For applications that can operate directly from the battery input voltage during Sleep mode and

require a higher voltage during normal run mode, the MCP1640C device provides input to output

bypass when disabled. The PIC Microcontroller is powered by the output of the MCP1640C. One

of its I/O pins is used to enable and disable the MCP1640C to control its bias voltage. While

operating in Sleep mode, the MCP1640C input quiescent current is typically less than 1 uA.

FIGURE 6-1:

Manganese Lithium Coin Cell Application using Bypass Mode.

VIN

3.3V To 4.2V

+

CIN

10 µF

-

L1

10 µH

SW VOUTS

VIN VOUTP

EN

VFB

PGND SGND

VOUT

5.0V @ 350 mA

976 K

309 K

COUT

10 µF

FIGURE 6-2:

USB On-The-Go Powered by Li-Ion.

 2010 Microchip Technology Inc.

DS22234A-page 19

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