ADP7105ACPZ-3.3-R7

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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