MCP1256-E/UN

Product Overview

• Category: Integrated Circuit (IC)
• Use: Voltage Boost Converter
• Characteristics: High efficiency, compact size, low power consumption
• Package: UN package (8-pin plastic small outline package)
• Essence: Boost converter IC designed to provide a regulated output voltage from a single-cell Li-Ion or three-cell NiMH/NiCd battery source
• Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: 3.3V or 5V (selectable)
• Maximum Output Current: 120mA
• Quiescent Current: 19µA (typical)
• Switching Frequency: 1.2MHz (typical)
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The MCP1256-E/UN has the following pin configuration:

1. VOUT: Output Voltage
2. GND: Ground
3. VIN: Input Voltage
4. FB: Feedback Pin for Output Voltage Regulation
5. EN: Enable Pin (active high)
6. SW: Switch Node Connection
7. LX: Inductor Connection
8. NC: No Connection

Functional Features

• Integrated synchronous rectifier for improved efficiency
• Low quiescent current for extended battery life
• Soft-start feature to minimize inrush current
• Overcurrent protection and thermal shutdown for enhanced safety
• Adjustable output voltage through external resistors

Advantages and Disadvantages

Advantages: - High efficiency conversion - Compact size for space-constrained applications - Low power consumption for extended battery life - Wide input voltage range for versatile use - Overcurrent protection and thermal shutdown for enhanced safety

Disadvantages: - Limited maximum output current (120mA) - Fixed output voltage options (3.3V or 5V)

Working Principles

The MCP1256-E/UN is a boost converter IC that utilizes an inductor to store energy from the input voltage source and then releases it to the output with a higher voltage level. It operates by switching the input voltage on and off at a high frequency, which is then stepped up through the inductor and capacitor network. The integrated synchronous rectifier ensures efficient power transfer, while the feedback mechanism regulates the output voltage.

Detailed Application Field Plans

The MCP1256-E/UN is commonly used in various battery-powered applications where a regulated voltage higher than the battery voltage is required. Some typical application fields include:

1. Portable electronic devices
2. Wireless communication systems
3. Battery-powered sensors
4. Medical devices
5. Industrial control systems

Detailed and Complete Alternative Models

1. MCP1640: Boost Converter IC with higher output current capability (up to 500mA)
2. LT1308: High-efficiency, low quiescent current boost converter IC
3. TPS61220: Ultra-low power boost converter IC with wide input voltage range

These alternative models offer similar functionality to the MCP1256-E/UN but may have different specifications and package options.

In conclusion, the MCP1256-E/UN is a compact and efficient boost converter IC designed for battery-powered applications. Its high efficiency, low power consumption, and wide input voltage range make it suitable for a variety of portable electronic devices and wireless communication systems. However, its limited maximum output current and fixed output voltage options should be considered when selecting the appropriate IC for specific applications.

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