TLC3702 Dual Micropower Comparator

Overview

The TLC3702 is a dual, independent, micropower voltage comparator designed for low-voltage and battery-powered applications. This component integrates two high-precision comparators in a single package, offering excellent performance with minimal power consumption. The TLC3702 is optimized for operation at supply voltages as low as 2.7V, making it ideal for portable and energy-efficient systems. Its rail-to-rail input capability and low input bias current further enhance its versatility in a wide range of applications.

Features

• Dual Independent Comparators: Two comparators in one package for space-saving designs.
• Micropower Consumption: Typically draws only 35µA per comparator, ideal for battery-operated devices.
• Wide Supply Voltage Range: Operates from 2.7V to 16V, accommodating various power sources.
• Rail-to-Rail Input: Supports input voltages from V- to V+, maximizing dynamic range.
• Low Input Bias Current: Typically 5pA, minimizing errors in high-impedance circuits.
• Push-Pull Output Stage: Eliminates the need for an external pull-up resistor.
• Fast Response Time: Propagation delay of 1.3µs (typical) for rapid signal processing.
• ESD Protection: Built-in protection against electrostatic discharge, enhancing reliability.

Applications

The TLC3702 is widely used in applications requiring precision voltage comparison with minimal power consumption. Key applications include:

• Battery-Powered Systems: Portable electronics, medical devices, and wireless sensors benefit from its low power draw.
• Threshold Detection: Overvoltage/undervoltage monitoring in power management circuits.
• Window Comparators: Used in conjunction with resistors to create voltage window detectors.
• Signal Conditioning: Interface between analog sensors and digital systems.
• Zero-Crossing Detectors: AC signal processing in audio and power control circuits.
• Industrial Control: Process monitoring and automation systems requiring reliable comparators.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V+ to V-): 18V
• Input Voltage Range: (V-) - 0.3V to (V+) + 0.3V
• Output Short-Circuit Duration: Continuous (with current limiting)
• Operating Temperature Range: -40°C to +125°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V+ to V-): 2.7V to 16V
• Input Common-Mode Voltage: Rail-to-rail
• Output Current: ±8mA (sink/source)
• Operating Temperature: -40°C to +125°C

Typical Performance Characteristics

• Input Offset Voltage: 0.5mV (max at 25°C)
• Input Bias Current: 5pA (typical)
• Supply Current (per comparator): 35µA (typical at 5V)
• Propagation Delay: 1.3µs (for 100mV overdrive)
• Output Voltage Swing: Within 50mV of rails (at 1mA load)

Package Information

The TLC3702 is available in multiple industry-standard packages to accommodate various PCB layouts and assembly processes.

Available Packages

• SOIC-8: Small Outline Integrated Circuit, 8-pin, 3.9mm body width
• PDIP-8: Plastic Dual In-Line Package, 8-pin, through-hole mounting
• TSSOP-8: Thin Shrink Small Outline Package, 8-pin, 3mm body width

Package Dimensions (SOIC-8)

• Body Length: 4.9mm (max)
• Body Width: 3.9mm (max)
• Height: 1.75mm (max)
• Lead Pitch: 1.27mm

Thermal Characteristics

• Junction-to-Ambient Thermal Resistance (θJA): 160°C/W (SOIC-8, still air)
• Junction-to-Case Thermal Resistance (θJC): 60°C/W (SOIC-8)

Design Considerations

Power Supply Bypassing

A 0.1µF ceramic capacitor should be placed as close as possible to the V+ pin to ensure stable operation, especially in noisy environments or when driving capacitive loads.

Input Protection

While the device features ESD protection diodes, applications with input voltages exceeding the supply rails should use external current-limiting resistors.

Output Loading

The push-pull output can source and sink up to 8mA. For heavier loads, an external buffer should be considered to avoid excessive power dissipation in the device.

Conclusion

The TLC3702 dual micropower comparator offers an excellent combination of precision, low power consumption, and versatility for a wide range of applications. Its rail-to-rail inputs, low bias currents, and compact packaging make it particularly suitable for battery-powered and space-constrained designs. When properly implemented with attention to power supply decoupling and load considerations, the TLC3702 provides reliable comparator functionality in demanding environments.