AP7179DSKZ20-13

Overview

The AP7179DSKZ20-13 is a high-output current, ultra-low noise, and high-accuracy LDO voltage regulator manufactured by Diodes Incorporated. It delivers up to 3A with a maximum dropout of 180mV at full load. The device operates within an input voltage range of 1.1V to 6.5V and provides output accuracy of ±1%. Output voltage is pin-programmable from 0.8V to 3.95V or adjustable via external resistors from 0.8V to 5.5V. It features ultra-high PSRR of 40dB at 500kHz and low output noise of 4.4μVRMS at 0.8V output. Packaged in W-QFN3535-20 (Type A1), it includes enable control, soft-start, and power-good indicators.

Feature Summary

• Ultra-low noise performance suitable for sensitive analog and RF circuits
• Pin-strapped output voltage programming for simplified PCB layout
• High power supply rejection ratio to minimize input noise coupling
• Integrated thermal shutdown and overcurrent protection

Applications

• Portable electronic devices
• Digital loads such as SerDes, FPGAs, and DSPs
• Analog circuits including VCO, ADC, DAC, and LVDS
• Test and measurement equipment

Procurement Notes

Verify the specific ordering suffix DSZ20 against the manufacturer's official documentation to confirm package type and tape-and-reel specifications. Ensure compliance with RoHS and halogen-free requirements if applicable to your design constraints. Cross-reference the datasheet revision number to validate electrical characteristics and application circuit recommendations before finalizing procurement.

Selection Notes

Select this component when designing power supplies for noise-sensitive applications requiring high current capability. The wide input voltage range and flexible output configuration options make it suitable for various digital and analog loads. Consider the thermal resistance and package size for heat dissipation requirements in compact designs.

Part Context

This part belongs to the AP7179D series of low-dropout regulators from Diodes Incorporated. It is designed to provide clean power rails for high-performance processors and communication interfaces. The series emphasizes low noise and high accuracy to support demanding signal integrity requirements in modern electronic systems.

Replacement Considerations

Consult the manufacturer's official documentation for confirmed substitute part numbers. Verify compatibility regarding pin assignments, electrical parameters, and package dimensions before implementing any replacement.

FAQ

How is the output voltage programmed?

The output voltage can be set using internal resistor networks connected to ground via specific pins (50mV to 1.6V) for values between 0.8V and 3.95V, or adjusted externally using a resistor divider for ranges up to 5.5V.

What is the purpose of the NR/SS pin?

The NR/SS pin serves dual functions: connecting a capacitor here reduces output noise by filtering the internal reference, and it also programs the soft-start time to control the output voltage ramp-up rate.