ADP7142ACPZN3.8-R7

Overview

The ADP7142ACPZN3.8-R7 is a CMOS low dropout linear regulator manufactured by Analog Devices Inc., providing a fixed 3.8 V output with a maximum load current of 200 mA. It operates from an input voltage range of 2.7 V to 40 V and features ultralow output noise of 11 µV rms across all fixed options. The device offers high power supply rejection ratios, reaching 88 dB at 10 kHz, and maintains excellent line and load regulation. Initial accuracy is specified at ±0.8%, expanding to ±1.8% over the full temperature range. It includes user-programmable soft start in LFCSP packages and precision enable functionality.

Feature Summary

• Ultralow output noise of 11 µV rms independent of the fixed output voltage setting
• High power supply rejection ratio achieving 88 dB at 10 kHz for stable operation
• User-programmable soft start capability available in LFCSP and SOIC packages
• Precision enable pin with defined logic thresholds and hysteresis

Applications

• Regulation for noise-sensitive analog and mixed-signal circuits
• Powering ADC and DAC circuits requiring clean voltage rails
• Supplying precision amplifiers and VCO VTUNE control
• Communications infrastructure and industrial instrumentation systems

Procurement Notes

Verify the specific package type and thermal requirements against your PCB layout before ordering. Confirm that the 3.8 V fixed output meets your system design needs, as this variant cannot be adjusted downward. Ensure input and output capacitor selections comply with the minimum capacitance and ESR specifications to maintain stability. Check for automotive qualification if deploying in vehicle environments.

Selection Notes

Select this component when a fixed 3.8 V rail is required from a high-voltage source up to 40 V. It is suitable for applications demanding low noise and high PSRR without the complexity of adjustable regulators. Consider the LFCSP package for compact designs requiring programmable soft start. Evaluate thermal dissipation based on the voltage drop and load current to ensure junction temperatures remain within safe operating limits.

Part Context

This part belongs to the ADP7142 family of high-input voltage LDOs designed for performance analog applications. The series supports various fixed output voltages ranging from 1.2 V to 5.0 V, allowing designers to choose the closest standard voltage to their target. The architecture enables adjusting fixed outputs higher via external dividers while maintaining low noise characteristics.

Replacement Considerations

Direct substitutes include other ADP7142 variants with different fixed output voltages such as ADP7142ACPZN3.3-R7 or ADP7142ACPZN5.0-R7 if voltage adjustment is feasible. Cross-family replacements require verifying input voltage ranges, current capabilities, and noise specifications.