MCP73811 datasheet(1/22 Pages) MICROCHIP

Part #	MCP73811

Description	Simple, Miniature Single-Cell, Fully Integrated Li-Ion / Li-Polymer Charge Management Controllers

PDF	22 Pages

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Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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DS22036A-page 1

MCP73811/2

Features

• Complete Linear Charge Management Controller

- Integrated Pass Transistor

- Integrated Current Sense

- Integrated Reverse Discharge Protection

• Constant Current / Constant Voltage Operation

with Thermal Regulation

• High Accuracy Preset Voltage Regulation: + 1%

• Voltage Regulation: 4.20V

• Selectable Charge Current:

- MCP73811: 85 mA / 450 mA

• Programmable Charge Current:

- MCP73812: 50 mA - 500 mA

• Minimum External Components Required:

- MCP73811: 2 Ceramic Capacitors

- MCP73812: 2 Ceramic Capacitors and

1 Resistor

• No Preconditioning

• No End-of-Charge Control

• No Undervoltage Lockout (UVLO)

• Automatic Power-Down when Input Power

Removed

• Active High Charge Enable

• Temperature Range:

- -40°C to +85°C

• Packaging:

- 5-Lead SOT-23

Applications

• Low-Cost Lithium-Ion/Lithium-Polymer Battery

Chargers

• Rechargeable Toys

• Electronic Cigarettes

• Bluetooth Headsets

• USB Chargers

Description

The MCP73811/2 devices are linear charge manage-

ment controllers that are designed for use in space

limited

and

cost

sensitive

applications.

The

MCP73811/2 provide specific charge algorithms for

single cell Li-Ion or Li-Polymer battery to achieve

optimal capacity in the shortest charging time possible.

Along with its small physical size, the low number of

external components required make the MCP73811/2

ideally suited for portable applications. For applications

charging from a USB port, the MCP73811 adheres to

all the specifications governing the USB power bus.

The MCP73811/2 employ a constant current/constant

voltage charge algorithm. The constant voltage regula-

tion is fixed at 4.20V, with a tight regulation tolerance of

1%. For the MCP73811, the constant current value is

selected as 85 mA (low power USB port) or 450 mA

(high power USB port) with a digital input signal on the

PROG input. For the MCP73812, the constant current

value is set with one external resistor. The

MCP73811/2 limit the charge current based on die

temperature during high power or high ambient

conditions. This thermal regulation optimizes the

charge cycle time while maintaining device reliability.

The MCP73811/2 are fully specified over the ambient

temperature

range

of

-40°C

to

+85°C.

The

MCP73811/2 are available in a 5-Lead, SOT-23

package.

Package Types

VDD

VBAT

5

5-Pin SOT-23

1

3

4

2

CE

PROG

VSS

Simple, Miniature Single-Cell, Fully Integrated

Li-Ion / Li-Polymer Charge Management Controllers

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