Microchip MCP73826 Handleiding

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 2002-2013 Microchip Technology Inc.DS21705B-page 1

MCP73826

Features

•Linear Charge Management Controller for Single

Lithium-Ion Cells

•High Accuracy Preset Voltage Regulation:

+1% (max)

•Two Preset Voltage Regulation Options:

-4.1V - MCP73826-4.1

-4.2V - MCP73826-4.2

•Programmable Charge Current

•Automatic Cell Preconditioning of Deeply

Depleted Cells, Minimizing Heat Dissipation Dur-

ing Initial Charge Cycle

•Automatic Power-Down when Input Power

Removed

•Temperature Range: -20°C to +85°C

•Packaging: 6-Pin SOT-23A

Applications

•Single Cell Lithium-Ion Battery Chargers

•Personal Data Assistants

•Cellular Telephones

•Hand Held Instruments

•Cradle Chargers

•Digital Cameras

Typical Application Circuit

Description

The MCP73826 is a linear charge management con-

troller for use in space-limited, cost sensitive applica-

tions. The MCP73826 combines high accuracy

constant voltage, controlled current regulation, and cell

preconditioning in a space saving 6-pin SOT-23A pack-

age. The MCP73826 provides a stand-alone charge

management solution.

The MCP73826 charges the battery in three phases:

preconditioning, controlled current, and constant volt-

age. If the battery voltage is below the internal low-volt-

age threshold, the battery is preconditioned with a

foldback current. The preconditioning phase protects

the lithium-ion cell and minimizes heat dissipation.

Following the preconditioning phase, the MCP73826

enters the controlled current phase. The MCP73826

allows for design flexibility with a programmable charge

current set by an external sense resistor. The charge

current is ramped up, based on the cell voltage, from

the foldback current to the peak charge current estab-

lished by the sense resistor. This phase is maintained

until the battery reaches the charge-regulation voltage.

Then, the MCP73826 enters the final phase, constant

voltage. The accuracy of the voltage regulation is better

than ±1% over the entire operating temperature range

and supply voltage range. The MCP73826-4.1 is preset

to a regulation voltage of 4.1V, while the MCP73826-

4.2 is preset to 4.2V.

The MCP73826 operates with an input voltage range

from 4.5V to 5.5V. The MCP73826 is fully specified

over the ambient temperature range of -20°C to +85°C.

Package Type

+

-

GND

V

DRV

V

SNS

V

IN

V

BAT

SHDN

1 2

3

6

5

4

10 µF

100 k



100 m



V

IN

Single

Lithium-Ion

Cell

NDS8434

MA2Q705

500 mA Lithium-Ion Battery Charger

5V

10 µF

MCP73826

6-Pin SOT-23A

GND

VDRV

VSNS

VIN

VBAT

SHDN 1

2

3

6

5

MCP73826

4

Single Cell Lithium-Ion Charge Management Controller

Product specificaties