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ADP7105ARDZ-1.8-R7 数据表(PDF) 1 Page - Analog Devices

部件名 ADP7105ARDZ-1.8-R7
功能描述  20 V, 500 mA, Low Noise LDO Regulator with Soft Start
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADP7105ARDZ-1.8-R7 数据表(HTML) 1 Page - Analog Devices

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20 V, 500 mA, Low Noise LDO Regulator
with Soft Start
Data Sheet
ADP7105
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
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 atVIN = 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
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
TYPICAL APPLICATION CIRCUITS
Figure 1. ADP7105 with Fixed Output Voltage, 5 V
Figure 2. ADP7105 with Adjustable Output Voltage, 5 V
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 regula-
tion of high performance analog and mixed-signal circuits
operating from 1.22 V to 19 V rails. Using an advanced proprie-
tary 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.
VOUT = 5V
VIN = 8V
PG
VOUT
VIN
PG
SS
GND
SENSE
EN/
UVLO
100k
100k
100k
COUT
1µF
CSS
CIN
1µF
ON
OFF
+
+
VOUT = 5V
VIN = 8V
PG
VOUT
VIN
PG
GND
ADJ
EN/
UVLO
100k
100k
100k
COUT
1µF
CIN
1µF
ON
OFF
+
+
13k
40.2k
SS
CSS


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