MCP7381X Просмотр технического описания (PDF) - Microchip Technology

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MCP7381X

Low-Cost Li-Ion Battery Charger Evaluation Board User’s Guide

Microchip Technology 

Product Overview

1.2 WHAT IS THE MCP7381X LI-ION BATTERY CHARGER EVALUATION

BOARD?

The MCP7381X Li-Ion Battery Charger Evaluation Board demonstrates the use of the

MCP73811/2 Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer

Charger Management Controllers.

The MCP7381X Li-Ion Battery Charger Evaluation Board is setup to evaluate low cost

single-cell Li-Ion / Li-Polymer battery chargers. This board utilizes Microchip's

MCP7381X Li-Ion Battery Charger Evaluation Board that efficiently charge Li-Ion /

Li-Polymer batteries with a preset +1% voltage accuracy regulation at 4.2V. The

MCP7381X Li-Ion Battery Charger Evaluation Board comes with two pre-installed cir-

cuits: An ac-dc adapter powered Li-Ion /Li-Polymer battery charger and an USB port

powered Li-Ion / Li-Polymer battery charger.

The MCP73811 is available for the USB port powered circuit while the MCP73812 is

designed for the ac-dc wall adapter powered circuit. A SOT-23-5 MCP73811 is

pre-installed on the evaluation board with a mechanical dip switch which selects charge

current High (450 mA) or Low (85 mA) for the USB port powered battery charger

system. A SOT23-5 MCP73812 is pre-installed on the evaluation board with a pro-

gramming resistor RPROG which delivers 500 mA from the ac-dc wall adapter source.

When the Chip Enable (CE) pin is in “High” condition, that particular circuit is ready to

charge single-cell Li-Ion batteries.

Note: The systems are designed in operation mode with CE pin High and can be

disabled when driving CE pin Low.

The two dashed silk screen areas on the evaluation board show the required circuit

size for the printed circuit board (PCB) layout and provide system / product designers

a visual aid prior design the system.

The MCP7381X Li-Ion Battery Charger Evaluation Board is designed to observe the

performance and features via multiple test points that are available on the circuits.

Users are able to discover the compact size of the layout in addition to the device itself.

The circuit can also be implemented into suitable applications without any additional

works.

1.3 WHAT THE MCP7381X LI-ION BATTERY CHARGER EVALUATION BOARD

KIT INCLUDES

The MCP7381X Li-Ion Battery Charger Evaluation Board kit includes:

• MCP7381X Li-Ion Battery Charger Evaluation Board, 102-00172

• Pre-installed 5-Lead SOT-23 MCP73811, 5-Lead SOT-23 MCP73812 and

required components.

• Analog and Interface Products Demonstration Boards CD-ROM (DS21912)

- MCP7381X Li-Ion Battery Charger Evaluation Board User’s Guide,

(DS51729)

- MCP73811/2 Data Sheet, “Simple, Miniature Single-Cell, Fully Integrated

Li-Ion / Li-Polymer Charge Management Controllers”, (DS22036)

© 2008 Microchip Technology Inc.

DS51729A-page 7

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