ADP7112ACBZ-1.2-R7

Overview

The ADP7112ACBZ-1.2-R7 is a CMOS low dropout linear regulator manufactured by Analog Devices Inc. It operates within an input voltage range of 2.7 V to 20 V and delivers up to 200 mA of output current. The device provides a fixed output voltage of 1.2 V with an initial accuracy of ±0.8%. Key electrical specifications include a typical quiescent current of 50 μA at no load, a shutdown current of 1.8 μA at 5 V input, and a typical dropout voltage of 200 mV at a 200 mA load. It features a power supply rejection ratio of 88 dB at 10 kHz and maintains an output noise of 11 μV rms across the 10 Hz to 100 kHz bandwidth.

Feature Summary

• Provides ultra-low output noise of 11 μV rms independent of the fixed output voltage setting.
• Features user-programmable soft start capability controlled by an external capacitor connected to the SS pin.
• Includes precision enable logic with defined high and low thresholds for reliable system control.
• Designed for stability using small ceramic capacitors, requiring only a minimum of 2.2 μF on the output.

Applications

• Regulation for noise-sensitive analog circuits such as ADCs and DACs
• Powering precision amplifiers and VCO VTUNE control lines
• Communications and infrastructure equipment requiring clean power rails
• Medical and healthcare instrumentation systems

Procurement Notes

Verify the specific suffix R7 indicates reel packaging when sourcing components. Confirm the ACBZ designation corresponds to the correct temperature grade and WLCSP package variant. Ensure compatibility with X5R or X7R dielectric capacitors for stable operation. Check datasheet revisions for any updates to absolute maximum ratings or thermal characteristics before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring high input voltages up to 20 V with low noise requirements. The adjustable output mode allows increasing the 1.2 V set point using an external resistor divider. Consider the thermal resistance of the 6-ball WLCSP package for heat dissipation in compact layouts. Ensure input and output capacitance meets the minimum 1.5 μF requirement over the full operating temperature range.

Part Context

This part belongs to the ADP7112 family of low dropout regulators from Analog Devices. The series is characterized by high power supply rejection and excellent transient response. Other variants in the family offer different fixed output voltages ranging from 1.2 V to 5.0 V. The architecture supports both fixed and adjustable output configurations within the same package footprint.

Replacement Considerations

Direct substitutes include other ADP7112 variants with different fixed output voltages such as ADP7112ACBZ-1.8-R7, ADP7112ACBZ-2.5-R7, ADP7112ACBZ-3.3-R7, and ADP7112ACBZ-5.0-R7. These parts share identical pinouts and electrical characteristics except for the nominal output voltage setting.

FAQ

Can the fixed 1.2 V output be adjusted to a higher voltage?

Yes, the output can be adjusted above the initial 1.2 V set point by connecting an external resistor divider to the SENSE/ADJ pin.

What is the recommended output capacitor type for stability?

X5R or X7R dielectric ceramic capacitors are recommended. Y5V and Z5U dielectrics are not recommended due to poor temperature and DC bias characteristics.

How is the soft start time determined?

The soft start time is determined by the value of an external capacitor connected to the SS pin. Leaving the pin open results in a typical start-up time of 380 μs.