Datasheet ADP7105 (Analog Devices)

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20 V, 500 mA, Low Noise LDO Regulator with Soft Start Data Sheet ADP7105 FEATURES TYPICAL APPLICATION CIRCUITS Input voltage range: 3.3 V to 20 V V VIN VOUT V IN = 8V OUT = 5V Maximum output current: 500 mA CIN + + COUT 1µF 1µF Low noise: 15 µV rms for fixed output versions SENSE PSRR performance of 60 dB at 10 kHz, V = 3.3 V 100k ON Ω OUT 100kΩ Reverse current protection OFF EN/ UVLO Low dropout voltage: 350 mV at 500 mA 100kΩ PG PG Initial accuracy: ±0.8% GND SS CSS
001
Accuracy over line, load, and temperature
1641- 1
−2% to +1%, T = −40°C to +125°C J
Figure 1. ADP7105 with Fixed Output Voltage, 5 V
−1.25% to +1%, T = 0°C to +85°C J Low quiescent current: 900 μA at V V VIN VOUT V IN = 8V OUT = 5V IN = 10 V, IOUT = 500 mA CIN + + COUT 40.2kΩ Low shutdown current: <50 µA at V 1µF 1µF IN = 12 V, stable with ADJ small 1 µF ceramic output capacitor 13kΩ ON 3 fixed output voltage options: 1.8, 3.3 V and 5 V 100kΩ OFF EN/ 100kΩ UVLO Adjustable output from 1.22 V to 19 V 100kΩ PG PG Programmable soft start for inrush current control GND SS CSS Foldback current-limit and thermal overload protection
002 1641-
User programmable precision UVLO/enable
1 Figure 2. ADP7105 with Adjustable Output Voltage, 5 V
Power-good indicator 8-lead LFCSP and 8-lead SOIC 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 Note that throughout this data sheet, the sense function (SENSE) of that operates from 3.3 V to 20 V and provides up to 500 mA of the SENSE/ADJ pin applies to fixed output voltage models only, output current. This high input voltage LDO is ideal for regula- whereas the adjust input function (ADJ) applies to adjustable tion of high performance analog and mixed-signal circuits output voltage models only. For example, Figure 1 shows the sense operating from 1.22 V to 19 V rails. Using an advanced proprietary function, and Figure 2 shows the adjust input function. architecture, the ADP7105 provides high power supply The ADP7105 output noise voltage is 15 µV rms and is inde- rejection and low noise, and achieves excellent line and load pendent of the output voltage. A digital power-good output transient response with only a small 1 µF ceramic output al ows power system monitors to check the health of the output capacitor. voltage. A user programmable precision undervoltage lockout The ADP7105 is available in three fixed output voltage options function facilitates sequencing of multiple power supplies. and an adjustable version that allows output voltages ranging The ADP7105 is available in 8-lead, 3 mm × 3 mm LFCSP and from 1.22 V to 19 V via an external feedback divider. The 8-lead SOIC packages. The LFCSP offers a very compact solution ADP7105 al ows an external soft start capacitor to be connected and provides excellent thermal performance for applications that to program the startup. require up to 500 mA of output current in a small, low profile footprint.
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Document Outline Features Applications Typical Application Circuits General Description Table of Contents Revision History Specifications Input and Output Capacitor, Recommended Specifications Absolute Maximum Ratings Thermal Data Thermal Resistance ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Theory of Operation Applications Information Capacitor Selection Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties Programmable Undervoltage Lockout (UVLO) Soft Start Function Power-Good Feature Noise Reduction of the Adjustable ADP7105 Current-Limit and Thermal Overload Protection Thermal Considerations Printed Circuit Board Layout Considerations Outline Dimensions Ordering Guide