FEATURES
Input voltage range:3.3Vto 20V
Maximum output current:500 mA
Low noise:15 uV rms for fixed output versions
PSRR performance of 60 dB at 10 kHz, Vour=3.3V
Reverse current protection
Low dropout voltage:350 mV at 500mA
Initial accuracy:±0.8%
Accuracy over line, load, and temperature:-2% to+1%
Low quiescent current:900 uA at VN=10 V, lour=500mA
Low shutdown current:<50 uA at Viw=12 V, stable with small 1 uF ceramic output capacitor
3 fixed output voltage options:1.8,3.3 V and5V
Adjustable output from 1.22Vto 19V
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 SOlC packages
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
GENERAL DESCRIPTION
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 uF 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 uV 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.
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