MCP73861-I/MLG

Product Overview

• Category: Battery Charger IC
• Use: Charging Lithium-Ion (Li-Ion) batteries
• Characteristics: High-performance, compact size, low-power consumption
• Package: MLG (2x3 mm DFN)
• Essence: Efficient and reliable battery charging solution
• Packaging/Quantity: Tape and Reel, 3000 units per reel

Specifications

• Input Voltage Range: 4.5V to 6.0V
• Charge Current Range: 15mA to 500mA
• Preconditioning Current: 10% of programmed current
• Charge Termination Options: C/10 or Timer
• Programmable Charge Current: Yes
• Programmable Charge Termination: Yes
• Thermal Regulation: Yes
• Reverse Discharge Protection: Yes
• Battery Temperature Monitoring: Yes
• Status Output: Yes
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MCP73861-I/MLG has the following pin configuration:

1. VBAT: Battery voltage input
2. STAT: Status output
3. PROG: Charge current programming input
4. TS: Battery temperature sense input
5. GND: Ground
6. VDD: Supply voltage input

Functional Features

• Constant Current/Constant Voltage (CC/CV) charging algorithm
• Programmable charge current and termination options
• Thermal regulation for safe operation
• Reverse discharge protection prevents battery drain
• Battery temperature monitoring ensures optimal charging conditions
• Status output for charge status indication

Advantages and Disadvantages

Advantages: - High-performance charging solution - Compact size allows for space-constrained applications - Low-power consumption for energy-efficient operation - Flexible charge current and termination options - Reliable thermal regulation and reverse discharge protection

Disadvantages: - Limited input voltage range (4.5V to 6.0V) - Operating temperature range may not be suitable for extreme environments

Working Principles

The MCP73861-I/MLG utilizes a CC/CV charging algorithm to efficiently charge Li-Ion batteries. It starts with a constant current phase, where the charge current is set by the PROG pin. Once the battery voltage reaches the programmed termination voltage, the charger switches to a constant voltage phase. The charge current gradually decreases until it reaches the C/10 termination current or the timer expires, indicating a fully charged battery.

Thermal regulation ensures safe operation by reducing the charge current if the IC temperature exceeds a certain threshold. Reverse discharge protection prevents the battery from draining back into the charger when the input power is removed. Battery temperature monitoring allows the charger to adjust the charging parameters based on the battery's temperature, ensuring optimal charging conditions.

Detailed Application Field Plans

The MCP73861-I/MLG is suitable for various applications that require efficient and reliable Li-Ion battery charging. Some potential application fields include:

1. Portable electronic devices: Smartphones, tablets, portable speakers
2. Wearable devices: Smartwatches, fitness trackers
3. IoT devices: Wireless sensors, smart home devices
4. Medical devices: Portable medical equipment, patient monitoring devices
5. Industrial equipment: Handheld tools, wireless communication devices

Detailed and Complete Alternative Models

1. MCP73871: Similar features and specifications, but with a different package (SOT-23)
2. MCP73831: Lower charge current range (15mA to 200mA), suitable for low-power applications
3. MCP73833: Higher charge current range (15mA to 1000mA), suitable for high-power applications

These alternative models provide options based on specific requirements and constraints of different applications.

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