MCP73831 datasheet, PDF - EEWORLD Datasheet

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MCP73831: Description1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5; Categoryaccessories; File Size700KB，28 Pages; ManufacturerMicrochip; Websitehttps://www.microchip.com

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1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5

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MCP73831/2

Miniature Single-Cell, Fully Integrated Li-Ion,

Li-Polymer Charge Management Controllers

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

Description:

The MCP73831/2 devices are highly advanced linear

charge management controllers for use in space-lim-

ited, 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/constant-

voltage charge algorithm with selectable precondition-

ing 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 temper-

ature 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

“Prod-

uct Identification System”

for standard options.

The MCP73831/2 devices are fully specified over the

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

Applications

•

Lithium-Ion/Lithium-Polymer Battery Chargers

Personal Data Assistants

Cellular Telephones

Digital Cameras

MP3 Players

Bluetooth Headsets

USB Chargers

Package Types

MCP73831/2

2×3 DFN*

8 PROG

7 NC

6 V

5 STAT

Typical Application

500 mA Li-Ion Battery Charger

4.7

μF

4 V

BAT

4.7

μF

PROG

470Ω

STAT

2 kΩ

+ Single

Li-Ion

- Cell

MCP73831/2

SOT-23-5

STAT 1

BAT

5 PROG

4 V

BAT

* Includes Exposed Thermal Pad (EP); see

Table 3-1.

MCP73831

2008 Microchip Technology Inc.

DS21984E-page 1

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