描述 Description

The MCP73831/2 devices are highly advanced linear

charge management controllers for use in spacelimited,

cost-sensitive applications. The MCP73831/2

are available in an 8-Lead, 2 mm x 3 mm DFN package

or a 5-Lead, SOT-23 package. Along with their small

physical size, the low number of external components

required make the MCP73831/2 ideally suited for

portable applications. For applications charging from a

USB port, the MCP73831/2 adhere to all the

specifications governing the USB power bus.

The MCP73831/2 employ a constant-current/constantvoltage

charge algorithm with selectable

preconditioning and charge termination. The constant

voltage regulation is fixed with four available options:

4.20V, 4.35V, 4.40V or 4.50V, to accommodate new,

emerging battery charging requirements. The constant

current value is set with one external resistor. The

MCP73831/2 devices 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.

Several options are available for the preconditioning

threshold, preconditioning current value, charge

termination value and automatic recharge threshold.

The preconditioning value and charge termination

value are set as a ratio or percentage of the

programmed constant current value. Preconditioning

can be disabled. Refer to Section 1.0 “Electrical

Characteristics” for available options and the

Product Identification System for standard options.

The MCP73831/2 devices are fully specified over the

ambient temperature range of -40°C to +85°C.

特性 Features

? Linear Charge Management Controller:

- Integrated Pass Transistor

- Integrated Current Sense

- Reverse Discharge Protection

? High-Accuracy Preset Voltage Regulation: + 0.75

? Four Voltage Regulation Options:

- 4.20V, 4.35V, 4.40V, 4.50V

? Programmable Charge Current: 15 mA to 500 mA

? Selectable Preconditioning:

- 10, 20, 40, or Disable

? Selectable End-of-Charge Control:

- 5, 7.5, 10, or 20

? Charge Status Output

- Tri-State Output - MCP73831

- Open-Drain Output - MCP73832

? Automatic Power-Down

? Thermal Regulation

? Temperature Range: -40°C to +85°C

? Packaging:

- 8-Lead, 2 mm x 3 mm DFN

- 5-Lead, SOT-23

Applications

? Lithium-Ion/Lithium-Polymer Battery Chargers

? Personal Data Assistants

? Cellular Telephones

? Digital Cameras

? MP3 Players

? Bluetooth Headsets

? USB Chargers