2 A, Low VIN, Low Dropout
Linear Regulator
Data Sheet
ADP1740/ADP1741
FEATURES
TYPICAL APPLICATION CIRCUITS
V
IN
= 1.8V
V
= 1.5V
OUT
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 @ 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)
4.7µF
4.7µF
14
VIN VIN VOUT VOUT
13
16
15
1 VIN
2 VIN
3 VIN
4 EN
VOUT 12
ADP1740
TOP VIEW
(Not to Scale)
VOUT 11
VOUT 10
SENSE 9
100kΩ
PG
Adjustable output voltage options with soft start:
0.75 V to 3.3 V (ADP1741)
High PSRR
PG GND SS NC
7
8
5
6
65 dB @ 1 kHz
10nF
65 dB @ 10 kHz
54 dB @ 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
Figure 1. ADP1740 with Fixed Output Voltage, 1.5 V
V
= 1.8V
V
= 0.5V(1 + R1/R2)
IN
OUT
4.7µF
4.7µF
14
VIN VIN VOUT VOUT
13
16
15
1 VIN
2 VIN
3 VIN
4 EN
VOUT 12
Logic-controlled enable
Reverse current protection
ADP1741
TOP VIEW
(Not to Scale)
VOUT 11
VOUT 10
100kΩ
APPLICATIONS
R1
PG
ADJ
PG GND SS NC
9
Server computers
Memory components
R2
7
8
5
6
Telecommunications equipment
Network equipment
10nF
DSP/FPGA/microprocessor supplies
Instrumentation equipment/data acquisition systems
Figure 2. ADP1741 with Adjustable Output Voltage, 0.75 V to 3.3 V
GENERAL DESCRIPTION
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 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/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.
The ADP1740 is available in seven fixed output voltage options.
The ADP1741 is an adjustable version that allows output
Rev. E
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