50 mA, High Voltage,
Micropower Linear Regulator
Data Sheet
ADP1720-EP
FEATURES
TYPICAL APPLICATION CIRCUITS
Wide input voltage range: 4 V to 28 V
Maximum output current: 50 mA
Low light load current
28 µA at 0 µA load
35 µA at 100 µA load
ADP1720-EP
FIXED
1
2
3
4
8
7
6
5
GND
IN
GND
GND
GND
GND
V
= 28V
IN
1µF
OUT
EN
V
= 5V
OUT
Low shutdown current: 0.7 µA
1µF
Low dropout voltage: 275 mV @ 50 mA load
Initial accuracy: 0.5%
Figure 1. ADP1720-EP with Fixed Output Voltage, 5.0 V
Accuracy over line, load, and temperature: 2%
Stable with small 1 µF ceramic output capacitor
Fixed 3.3 V and 5.0 V output voltage options
Adjustable output voltage option: 1.225 V to 5.0 V
Current limit and thermal overload protection
Logic controlled enable
ADP1720-EP
R2
R1
ADJUSTABLE
1
2
3
4
8
7
6
5
ADJ
IN
GND
GND
GND
GND
V
= 12V
IN
V
1µF
OUT
EN
=
OUT
1.225V(1 + R1/R2)
Space-saving MSOP package
1µF
ENHANCED PRODUCT FEATURES
Figure 2. ADP1720-EP with Adjustable Output Voltage, 1.225 V to 5.0 V
Enhanced processing (EP) for −55°C to +125°C operation
APPLICATIONS
DC-to-dc post regulation
PCMCIA regulation
Keep-alive power in portable equipment
Industrial applications
Aeronautic and military operating temperature environment
GENERAL DESCRIPTION
The ADP1720-EP is a high voltage, micropower, low dropout
linear regulator. Operating over a very wide input voltage range
of 4 V to 28 V, the ADP1720-EP can provide up to 50 mA of
output current. With just 28 µA of quiescent supply current and a
micropower shutdown mode, this device is ideal for applications
that require low quiescent current.
The ADP1720-EP is optimized for stable operation with small
1 µF ceramic output capacitors, allowing for good transient
performance while occupying minimal board space.
The ADP1720-EP operates from –55°C to +125°C and uses
current limit protection and thermal overload protection
circuits to prevent damage to the device in adverse conditions.
The ADP1720-EP is available in fixed output voltages of 3.3 V
and 5.0 V. An adjustable version is also available, which allows
the output to be set anywhere between 1.225 V and 5.0 V. An
enable function that allows external circuits to turn on and turn
off the ADP1720 output is available. For automatic startup, the
enable (EN) pin can be connected directly to the input rail.
Available in a small MSOP package, the ADP1720-EP provides
a compact solution with low thermal resistance.
Additional application and technical information can be found
in the ADP1720 data sheet.
Rev. A
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