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Overview
Features and Benefits
- Input voltage range: 3.3 V to 20 V
- Maximum output current: 500 mA
- Low noise: 15 μV rms for fixed output versions
- PSRR performance of 60 dB at
10 kHz, VOUT = 3.3 V - Reverse current protection
- Low dropout voltage: 350 mV at
500 mA - Initial accuracy: ±0.8%
- Accuracy over line, load, and temperature: −2% to +1%
- Low quiescent current: 900 μA at
VIN = 10 V, IOUT = 500 mA - Low shutdown current: <50 μA at
VIN = 12 V, stable with small 1 μF ceramic output capacitor - 3 fixed output voltage options:
1.8, 3.3 V and 5 V - See datasheet for additional features
Product Details
The ADP7105 is a CMOS, low dropout (LDO) linear regulator that operates from 3.3 V to 20 V and provides up to 500 mA of output current. This high input voltage LDO is ideal for regula-tion of high performance analog and mixed-signal circuits operating from 1.22 V to 19 V rails. Using an advanced proprietary architecture, the ADP7105 provides high power supply rejection and low noise, and achieves excellent line and load transient response with only a small 1 μF ceramic output capacitor.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.
APPLICATIONS
- 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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Recommended for New Designs
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.
Evaluation Kits (2)
Documentation
Solutions Bulletins & Brochures (2)
Tools & Simulations
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
LTpowerCAD
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Design tools for the following parts are available in LTpowerCAD:
Design Tools
ADIsimPower is the fastest and most accurate Power Management design tool. ADI's Design Center lets you design your power circuits in three easy steps.
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
Reference Designs (2)
Reference Materials
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Design Resources
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