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Analog Devices Semiconductor Electronic Components Datasheet

ADP1741 Datasheet

Low Dropout Linear Regulator

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ADP1741 pdf
Data Sheet
FEATURES
Maximum output current: 2 A
Input voltage range: 1.6 V to 3.6 V
Low shutdown current: 2 µA
Low dropout voltage: 160 mV at 2 A load
Initial accuracy: ±1%
Accuracy over line, load, and temperature: ±2%
7 fixed output voltage options with soft start:
0.75 V to 2.5 V (ADP1740)
Adjustable output voltage options with soft start:
0.75 V to 3.3 V (ADP1741)
High PSRR
65 dB at 1 kHz
65 dB at 10 kHz
54 dB at 100 kHz
23 μV rms at 0.75 V output
Stable with small 4.7 µF ceramic output capacitor
Excellent load and line transient response
Current-limit and thermal overload protection
Power-good indicator
Logic-controlled enable
Reverse current protection
APPLICATIONS
Server computers
Memory components
Telecommunications equipment
Network equipment
DSP/FPGA/microprocessor supplies
Instrumentation equipment/data acquisition systems
GENERAL DESCRIPTION
The ADP1740/ADP1741 are low dropout (LDO) CMOS linear
regulators that operate from 1.6 V to 3.6 V and provide up to 2 A
of output current. These low VIN/VOUT LDOs are ideal for regu-
lation of nanometer FPGA geometries operating from 2.5 V down
to 1.8 V I/O rails, and for powering core voltages down to 0.75 V.
Using an advanced, proprietary architecture, the ADP1740/
ADP1741 provide high power supply rejection ratio (PSRR) and
low noise, and achieve excellent line and load transient response
with only a small 4.7 µF ceramic output capacitor.
The ADP1740 is available in seven fixed output voltage options.
The ADP1741 is an adjustable version that allows output
2 A, Low VIN, Low Dropout
Linear Regulator
ADP1740/ADP1741
TYPICAL APPLICATION CIRCUITS
VIN = 1.8V
VOUT = 1.5V
4.7µF
100kΩ
PG
16 15 14 13
VIN VIN VOUT VOUT
1 VIN
VOUT 12
2 VIN
3 VIN
ADP1740 VOUT 11
TOP VIEW
(Not to Scale) VOUT 10
4 EN
SENSE 9
PG GND SS NC
5678
10nF
4.7µF
VIN = 1.8V
Figure 1. ADP1740 with Fixed Output Voltage, 1.5 V
VOUT = 0.5V(1 + R1/R2)
4.7µF
100kΩ
PG
16 15 14 13
VIN VIN VOUT VOUT
1 VIN
VOUT 12
2 VIN
3 VIN
ADP1741 VOUT 11
TOP VIEW
(Not to Scale) VOUT 10
4 EN
PG GND SS
567
ADJ 9
NC
8
4.7µF
R1
R2
10nF
Figure 2. ADP1741 with Adjustable Output Voltage, 0.75 V to 3.3 V
voltages ranging from 0.75 V to 3.3 V via an external divider.
The ADP1740/ADP1741 allow an external soft start capacitor
to be connected to program the startup. A digital power-good
output allows power system monitors to check the health of the
output voltage.
The ADP1740/ADP1741 are available in a 16-lead, 4 mm ×
4 mm LFCSP, making them not only very compact solutions,
but also providing excellent thermal performance for applica-
tions that require up to 2 A of output current in a small, low
profile footprint.
Rev. H
Document Feedback
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responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. 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 ©2008–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

ADP1741 Datasheet

Low Dropout Linear Regulator

No Preview Available !

ADP1741 pdf
ADP1740/ADP1741
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Typical Application Circuits............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Input and Output Capacitor, Recommended Specifications.. 4
Absolute Maximum Ratings............................................................ 5
Thermal Data ................................................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 11
Soft Start Function ..................................................................... 11
Adjustable Output Voltage (ADP1741)................................... 12
Enable Feature ............................................................................ 12
Power-Good Feature .................................................................. 12
Reverse Current Protection Feature ........................................ 13
Applications Information .............................................................. 14
Capacitor Selection .................................................................... 14
Undervoltage Lockout ............................................................... 15
Current-Limit and Thermal Overload Protection................. 15
Thermal Considerations............................................................ 15
PCB Layout Considerations...................................................... 17
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19
REVISION HISTORY
1/15—Rev. G to Rev. H
Changes to Ordering Guide .......................................................... 19
4/14—Rev. F to Rev. G
Changes to Figure 1 and Figure 2................................................... 1
Changes to Figure 3 and Figure 4................................................... 6
Updated Outline Dimensions ....................................................... 19
Changes to Ordering Guide .......................................................... 19
8/13—Rev. E to Rev. F
Changes to Ordering Guide .......................................................... 19
6/13—Rev. D to Rev. E
Changed Adjustable Output Voltage Option with Soft Start
(ADP1755) from 0.75 V to 3.0 V to 0.75 V to 3.3 V
(Throughout) .................................................................................... 1
Updated Outline Dimensions ....................................................... 19
12/12—Rev. C to Rev. D
Added Junction Temperature of 150°C, Table 3........................... 5
Changes to Ordering Guide .......................................................... 19
9/12—Rev. B to Rev. C
Changes to Table 3............................................................................ 5
Changes to Ordering Guide .......................................................... 19
2/10—Rev. A to Rev. B
Changes to Table 4............................................................................ 5
Changes to Ordering Guide .......................................................... 19
4/09—Rev. 0 to Rev. A
Changes to Table 3............................................................................ 5
10/08—Revision 0: Initial Version
Rev. H | Page 2 of 20


Part Number ADP1741
Description Low Dropout Linear Regulator
Maker Analog Devices
Total Page 20 Pages
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