AN7705SP

Overview

The AN7705SP is a 3-pin, positive output, low dropout voltage regulator from the AN77xxSP series, manufactured by Panasonic Industry. It provides a fixed 5 V output with a maximum current of 1.2 A. The device operates within an input supply voltage range of 6 V to 16 V and features a minimum I/O voltage difference of 0.5 V typical. Key electrical characteristics include a ripple rejection ratio of 50 dB at 120 Hz and a bias current of 5.0 mA maximum at no load. The component utilizes a Silicon monolithic bipolar IC technology housed in an SP-3SUA package.

Feature Summary

• Integrated on-chip overcurrent limiter for protection against excessive load currents.
• Built-in thermal protection circuit that shuts down the output when junction temperature exceeds safe limits.
• Input short-circuit protection circuit prevents current flow between pins 1 and 3 if the input pin is shorted to ground.
• Inrush current protection circuit manages startup conditions when input voltage is applied.

Applications

• Power supply equipment
• Low-voltage battery driven equipment
• Home appliances
• Industrial equipment with fluctuating supply voltages

Procurement Notes

Verify the specific lifecycle stage (maintenance or discontinued) via official Panasonic channels before procurement. Confirm package code SP-3SUA matches design requirements. Ensure application does not involve automotive or safety-critical systems where failure jeopardizes life, as these are excluded from standard use cases. Check latest Product Standards for any specification changes prior to final design approval.

Selection Notes

Select this regulator for applications requiring a stable 5 V rail with up to 1.2 A capacity. Consider the 0.5 V typical dropout voltage for efficiency in low-voltage systems. Verify external capacitor ESR characteristics for stability, particularly at low temperatures. Ensure operating ambient temperature remains within -30°C to +85°C and power dissipation limits are respected based on thermal data.

Part Context

The AN7705SP belongs to the AN77xxSP series of low dropout voltage regulators. This series offers various fixed output voltages including 3.3 V, 3.5 V, 5 V, 6 V, 7 V, 8 V, 9 V, 10 V, 12 V, and 15 V. All variants share similar protective features and packaging, differing primarily in their regulated output voltage levels.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Consult Panasonic Industry directly for potential replacements or updated product lines.

FAQ

Is an external protection diode required for the AN7705SP?

No, an external silicon diode is not required because the AN77xxSP series includes a built-in input short-circuit protection circuit that safeguards the element from discharge current flowing into the input side.

What type of output capacitor is recommended for stability?

An aluminum electrolytic or tantalum capacitor with a capacitance of 33 μF is recommended. The equivalent series resistance (ESR) must have temperature characteristics within the recommended area to prevent oscillation, especially at low temperatures.