2 A, Low Dropout, CMOS Linear Regulator
Preliminary Technical Data
ADP1740/ADP1741
FEATURES
TYPICAL APPLICATION CIRCUITS
V
= 1.8V
V
= 1.5V
OUT
IN
Maximum output current: 2 A
Input voltage range: 1.6 V to 3.6 V
Low shutdown current: <1 μA
Low dropout voltage: 200 mV @ 2 A load
Initial accuracy: 1ꢀ
Accuracy over line, load, and temperature: 2.5ꢀ
7 fixed output voltage options with soft start (ADP1740):
0.75 V to 2.5 V
Adjustable output voltage options with soft start (ADP1741):
0.75 V to 3.0 V
4.7µF
4.7µF
14
13
16
IN
15
IN
OUT
OUT
PIN 1
1 IN
2 IN
3 IN
4 EN
OUT 12
INDICATOR
OUT 11
OUT 10
100kΩ
ADP1740
TOP VIEW
(Not to Scale)
SENSE 9
SS NC
PG GND
5
7
8
6
Stable with small 4.7 μF ceramic output capacitor
Excellent load/line transient response
Current limit and thermal overload protection
Power Good indicator
10nF
NC = NO CONNECT
Logic-controlled enable
Figure 1. ADP1740 with Fixed Output Voltage, 1.5 V
APPLICATIONS
V
= 1.8V
V
= 0.5V(1 + R1/R2)
4.7µF
IN
OUT
Notebook computers
Memory components
Telecommunications equipment
Network equipment
4.7µF
14
13
16
IN
15
IN
OUT OUT
PIN 1
INDICATOR
1 IN
2 IN
3 IN
4 EN
OUT 12
OUT 11
OUT 10
ADJ 9
DSP/FPGA/microprocessor supplies
Instrumentation equipment/data acquisition systems
R1
100kΩ
ADP1741
TOP VIEW
(Not to Scale)
SS NC
7
PG GND
8
5
6
R2
10nF
NC = NO CONNECT
Figure 2. ADP1741 with Adjustable Output Voltage, 0.75 V to 3.0 V
GENERAL DESCRIPTION
The ADP1740/ADP1741 are CMOS, low dropout linear regula-
tors that operate from 1.6 V to 3.6 V and provide up to 2 A of
output current. Using an advanced proprietary architecture,
they provide high power supply rejection and achieve excellent
line and load transient response with a small 4.7 μF ceramic
output capacitor.
allows output voltages that range from 0.75 V to 3.0 V via
an external divider. The ADP1740/ADP1741 allow an external
soft start capacitor to be connected to program the start-up.
The ADP1740/ADP1741 are available in a 16-lead, 4 mm ×
4 mm LFCSP, making them very compact solutions while
providing excellent thermal performance for applications
requiring up to 2 A of output current in a small, low profile
footprint.
The ADP1740 is available in seven fixed output voltage options.
The ADP1741 is an adjustable output voltage version, which
Rev. PrA
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or 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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2007 Analog Devices, Inc. All rights reserved.
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