20 V, 500 mA, Low Noise LDO Regulator with Soft Start
The ADP7105 is available in three fixed output voltage options and an adjustable version that allows output voltages ranging from 1.22 V to 19 V via an external feedback divider. The ADP7105 allows an external soft start capacitor to be connected to program the startup.
Note that throughout this data sheet, the sense function (SENSE) of the SENSE/ADJ pin applies to fixed output voltage models only, whereas the adjust input function (ADJ) applies to adjustable output voltage models only. For example, Figure 1 shows the sense function, and Figure 2 shows the adjust input function.
The ADP7105 output noise voltage is 15 μV rms and is inde-pendent of the output voltage. A digital power-good output allows power system monitors to check the health of the output voltage. A user programmable precision undervoltage lockout function facilitates sequencing of multiple power supplies.
The ADP7105 is available in 8-lead, 3 mm × 3 mm LFCSP and 8-lead SOIC packages. The LFCSP offers a very compact solution and provides excellent thermal performance for applications that require up to 500 mA of output current in a small, low profile footprint.
- Regulation of noise sensitive applications:
ADC and DAC circuits, precision amplifiers,
high frequency oscillators, clocks, and PLLs
- Communications and infrastructure
- Medical and healthcare
- Industrial and instrumentation
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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The EVAL-ADICUP360 is an Arduino and PMOD compatible form factor development board. The board uses an open source Eclipse based Interactive Development Environment (IDE) which can be downloaded free of charge. The platform contains many hardware and software example projects, to make it easier for customers to prototype/create systems and solutions using the complete ecosystem provided.
The EVAL-ADICUP360 uses the ADuCM360 Arm Cortex-M3 processor as the main device on board. It has integrated dual 24-bit sigma delta converters on chip, which make it extremely flexible for both analog and digital application.
This user guide provides quick start instructions for working with the board.
Full specifications for the ADA8282 are available in the product data sheet, which should be consulted in conjunction with this user guide when using the evaluation board.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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