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ADM7172ACPZ-4.2-R7 bảng dữ liệu(PDF) 1 Page - Analog Devices

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ADM7172ACPZ-4.2-R7 bảng dữ liệu(HTML) 1 Page - Analog Devices

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6.5 V, 2 A, Ultralow Noise, High PSRR, Fast
Transient Response CMOS LDO
Data Sheet
ADM7172
Rev. C
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
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
©2014–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
Input voltage range: 2.3 V to 6.5 V
Maximum load current: 2 A
Low noise: 5 μV rms independent of output voltage at
100 Hz to 100 kHz
Fast transient response: 1.5 μs for 1 mA to 1.5 A load step
60 dB PSRR at 100 kHz
Low dropout voltage: 172 mV at 2 A load, VOUT = 3 V
Initial accuracy: −0.5% (minimum), +1% (maximum)
Accuracy over line, load, and temperature: ±1.5%
Quiescent current, IGND = 0.7 mA with no load
Low shutdown current: 0.25 μA at VIN = 5 V
Stable with small 4.7 μF ceramic output capacitor
Adjustable and fixed output voltage options: 1.2 V to 5.0 V
Adjustable output from 1.2 V to VIN − VDO
Precision enable
Adjustable soft start
8-lead 3 mm × 3 mm LFCSP package
Supported by ADIsimPower™ tool
APPLICATIONS
Regulation to noise sensitive applications: ADC and DAC
circuits, precision amplifiers, PLLs/VCOs, and clocking ICs
Communications and infrastructure
Medical and healthcare
Industrial and instrumentation
GENERAL DESCRIPTION
The ADM7172 is a CMOS, low dropout linear regulator (LDO)
that operates from 2.3 V to 6.5 V and provides up to 2 A of output
current. This high output current LDO is ideal for regulation of
high performance analog and mixed-signal circuits operating
from 6 V down to 1.2 V rails. Using an advanced proprietary
architecture, the device provides high power supply rejection
and low noise, and achieves excellent line and load transient
response with just a small 4.7 μF ceramic output capacitor. Load
transient response is typically 1.5 μs for a 1 mA to 1.5 A load step.
The ADM7172 is available in 17 fixed output voltage options.
The following voltages are available from stock: 1.3 V, 1.8 V,
2.5 V, 3.0 V, 3.3 V, 4.2 V, and 5.0 V. Additional voltages that are
available by special order are: 1.5 V, 1.85 V, 2.0 V, 2.2 V, 2.7 V,
2.75 V, 2.8 V, 2.85 V, 3.8 V, and 4.6 V. An adjustable version is
also available that allows output voltages that range from 1.2 V
to VIN − VDO with an external feedback divider.
TYPICAL APPLICATION CIRCUIT
VOUT
SENSE
SS
VIN
EN
ADM7172
GND
VIN
VOUT
CSS
1nF
CIN
4.7µF
COUT
4.7µF
OFF
ON
VIN = 5V
VOUT = 3.3V
Figure 1. ADM7172 with Fixed Output Voltage, 3.3 V
Inrush current can be controlled by adjusting the start-up time
via the soft start pin. The typical start-up time with a 1 nF soft
start capacitor is 1.0 ms.
The ADM7172 regulator output noise is 5 μV rms, independent
of the output voltage. The ADM7172 is available in an 8-lead,
3 mm × 3 mm LFCSP, making it not only a very compact solution,
but also providing excellent thermal performance for applications
requiring up to 2 A of output current in a small, low profile
footprint.
CH1 1.0A ΩBW CH2 20mV BW M400ns A CH3
100mV
T 0.0%
1
2
T
Figure 2. Transient Response (Trace 2), 1 mA to 1.5 A Load Step in 400 ns (Trace 1)
Table 1. Related Devices
Device
Input Voltage
Output Current
Package
ADM7170
2.3 V to 6.5 V
500 mA
8-lead LFCSP
ADM7171
2.3 V to 6.5 V
1 A
8-lead LFCSP


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