ADP7105
20 V, 500 mA, Low Noise LDO Regulator with Soft Start
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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%, TJ = −40°C to +125°C
- −1.25% to +1%, TJ = 0°C to +85°C
- 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
- Adjustable output from 1.22 V to 19 V
- Programmable soft start for inrush current control
- Foldback current-limit and thermal overload protection
- User programmable precision UVLO/enable
- Power-good indicator
- 8-lead LFCSP and 8-lead SOIC packages
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 regulation 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 independent 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
Product Categories
Markets and Technologies
Product Lifecycle
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 (3)
Documentation & Resources
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Complete Gas Sensor Circuit Using Nondispersive Infrared (NDIR)10/1/2016 Analog Dialogue
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Noise-Reduction Network for Adjustable-Output Low-Dropout Regulators3/1/2014 Analog Dialogue
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:
ADP7105
ADP7105-1.8
ADP7105-3.3
ADP7105-5.0
Design Tool
ADI Linear Regulator Design Tool and Parametric Search
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)
Design Resources
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Sample & Buy
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.