ADP7104ACPZ-3.3-R7

Overview

The ADP7104ACPZ-3.3-R7 is a CMOS low dropout linear regulator manufactured by Analog Devices Inc., featuring a fixed 3.3 V output and a maximum output current of 500 mA. It operates within an input voltage range of 3.3 V to 20 V, delivering a typical quiescent current of 900 μA at full load. The device provides a low dropout voltage of 350 mV at 500 mA and maintains an initial accuracy of ±0.8%. It incorporates reverse current protection, foldback current limiting, and thermal overload protection.

Feature Summary

• Provides low noise performance with 15 µV rms output noise for fixed output versions.
• Features high power supply rejection ratio (PSRR) of 60 dB at 10 kHz.
• Includes a user-programmable precision undervoltage lockout function for power sequencing.
• Offers a digital power-good indicator to monitor output voltage health.

Applications

• Regulation for noise-sensitive applications such as ADC and DAC circuits
• Precision amplifiers, high frequency oscillators, clocks, and PLLs
• Communications and infrastructure systems
• Medical and healthcare equipment
• Industrial and instrumentation devices

Procurement Notes

Verify the specific package type and tape-and-reel configuration against the manufacturer's ordering guide before procurement. Confirm that the component meets all required environmental specifications, including operating temperature ranges and ESD sensitivity precautions during handling. Ensure compatibility with standard surface-mount assembly processes.

Selection Notes

Select this component when a stable 3.3 V rail is required from inputs up to 20 V with moderate current demands. Consider its compact LFCSP footprint for space-constrained designs. Evaluate thermal dissipation requirements based on the expected load current and ambient conditions to ensure junction temperatures remain within safe operational limits.

Part Context

This part belongs to the ADP7104 family of high-input-voltage LDO regulators designed for analog and mixed-signal circuits. The series offers multiple fixed output voltages and an adjustable version, catering to diverse power rail needs. The ADP7104ACPZ-3.3-R7 specifically targets applications requiring low noise and high PSRR in a small form factor.

Replacement Considerations

Direct replacements include other ADP7104 variants with different fixed output voltages or the adjustable version. Verify pin compatibility and electrical parameters such as dropout voltage and quiescent current when substituting with similar LDO regulators from other manufacturers.

FAQ

What is the minimum recommended output capacitance for stability?

A minimum of 1 µF ceramic capacitor with an ESR of 1 Ω or less is recommended to ensure stability.

How does the ADP7104 handle reverse current flow?

It incorporates reverse current protection circuitry that prevents current from flowing backwards through the pass element when the output voltage exceeds the input voltage.