ADM7170ACPZ-1.8-R7

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The ADM7170ACPZ-1.8-R7 is a fixed-output low dropout linear regulator providing 1.8 V at up to 500 mA load current. It operates from an input voltage range of 2.3 V to 6.5 V with a typical quiescent current of 0.7 mA and shutdown current of 0.25 μA. The device features ultralow noise (5 μV rms) and high power supply rejection ratio (60 dB at 100 kHz). Initial accuracy is ±0.75%, with line regulation of 0.1 %/V and load regulation of 0.1 %/A. Dropout voltage is 42 mV at full load. It includes precision enable, adjustable soft start, and thermal/current protection in an 8-lead LFCSP package.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Ultralow output noise independent of the output voltage setting
• High power supply rejection ratio across wide frequency ranges
• Fast transient response utilizing small ceramic output capacitors
• Precision enable pin with programmable soft start functionality

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Noise-sensitive analog circuits such as ADCs and DACs
• Precision amplifiers and PLL/VCO clocking ICs
• Medical and healthcare instrumentation systems
• Industrial and infrastructure communications equipment

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix R7 indicates reel packaging configuration when sourcing. Confirm the ACPZ designation corresponds to the 8-lead LFCSP thermal pad package. Ensure the 1.8 fixed output variant matches system requirements rather than the adjustable version. Check for RoHS compliance documentation during procurement validation.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component for applications requiring high PSRR and minimal output noise without large external filtering capacitors. The fixed 1.8 V output eliminates external resistor divider networks required by adjustable versions. Verify that the input voltage remains within the 2.3 V to 6.5 V operational range under all conditions. Consider the 42 mV dropout voltage for headroom calculations at maximum load currents.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the ADM7170 family of CMOS low dropout regulators designed for high-performance mixed-signal circuits. It shares architectural similarities with the ADM7171 (1 A) and ADM7172 (2 A) variants, offering comparable noise and PSRR characteristics scaled for different current demands. All members utilize the same compact 8-lead LFCSP footprint.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

ADM7171ACPZ-1.8-R7 provides identical electrical performance with increased 1 A output capability. ADM7172ACPZ-1.8-R7 offers 2 A output capacity while maintaining the same package and pinout. Both alternatives ensure mechanical compatibility but require verification of thermal dissipation limits under higher load conditions.