MCP1826ST-3302E/DB: High-Performance 3.3V 1A Linear Voltage Regulator by Microchip Technology

The MCP1826ST-3302E/DB is a premium-grade linear voltage regulator from Microchip Technology, delivering exceptional power regulation in a compact SOT223-3 package. This comprehensive guide explores its features, benefits, and applications to help engineers select the ideal voltage regulator for their projects.

Product Overview

Designed for demanding applications, the MCP1826ST-3302E/DB provides:

• Fixed 3.3V output with 1% accuracy
• 1A continuous output current
• Ultra-low 0.4V dropout at full load
• Only 220 A quiescent current
• Wide -40 C to +125 C operating range

Detailed Technical Specifications

Electrical Characteristics

Parameter	Value
Output Voltage	3.3V 1%
Maximum Input Voltage	6V
Dropout Voltage	0.4V @ 1A
Output Current	1A (max)
Line Regulation	0.05%/V (typ)
Load Regulation	0.1% (typ)
PSRR	60dB @ 100Hz

Advanced Protection Features

The MCP1826ST-3302E/DB incorporates multiple protection mechanisms:

1. Thermal Shutdown: Automatically disables output at 150 C (typ) with hysteresis
2. Current Limit: Foldback protection prevents damage during short circuits
3. UVLO: Ensures proper operation only when input voltage > 2.3V

Package and Thermal Management

The SOT223-3 package offers:

• Compact 6.5mm 7mm footprint
• Thermal resistance of 62 C/W (junction-to-ambient)
• Copper pad for enhanced heat dissipation

Thermal Design Tip: For continuous 1A operation, provide at least 100mm of copper area connected to the tab.

Application Circuits

Basic Implementation

For most applications, only input/output capacitors are required:

• Input capacitor: 1 F ceramic (X5R or better)
• Output capacitor: 10 F ceramic (X5R or better)

Noise Reduction Techniques

For sensitive analog circuits:

1. Add 10 resistor in series with output
2. Place additional 10 F tantalum capacitor at load
3. Use shielded routing for output traces

Comparative Analysis

Compared to similar regulators, the MCP1826ST-3302E/DB offers:

Feature	MCP1826ST-3302E/DB	Competitor A	Competitor B
Dropout Voltage	0.4V	0.6V	0.5V
Quiescent Current	220 A	300 A	500 A
PSRR	60dB	50dB	55dB

Design Considerations

Input Voltage Selection

For optimal performance:

• Minimum input voltage = 3.3V + 0.4V = 3.7V
• Recommended operating range: 4V-5.5V
• Absolute maximum: 6V

Layout Guidelines

1. Place input capacitor within 5mm of VIN pin
2. Use wide traces for high-current paths
3. Connect thermal pad to ground plane
4. Keep sensitive analog circuits away from regulator

Frequently Asked Questions

Q: Can this regulator operate from a 3.7V Li-ion battery?

A: Yes, the low dropout voltage allows operation down to 3.7V input while maintaining 3.3V output.

Q: What's the maximum power dissipation?

A: Approximately 1.3W with proper PCB heatsinking (TA = 25 C).

Q: Is the output voltage adjustable?

A: No, this is a fixed 3.3V version. Consider the MCP1826S-ADJE/DB for adjustable output.

Purchasing Information

The MCP1826ST-3302E/DB is available:

• Package: Tape & Reel (3,000 units)
• Lead time: Typically ships within 24 hours
• Pricing: Volume discounts available

Conclusion

The MCP1826ST-3302E/DB represents an optimal balance of performance, size, and cost for 3.3V regulation needs. Its exceptional combination of low dropout, high current capability, and robust protection makes it ideal for:

• IoT devices
• Industrial control systems
• Automotive electronics
• Portable medical equipment
• Consumer electronics

For design support or to request samples, contact our technical sales team today.