50 mA, High Voltage,

Micropower Linear Regulator

Data Sheet

ADP1720-EP

Rev. A

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FEATURES

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

Low shutdown current: 0.7 µA

Low dropout voltage: 275 mV @ 50 mA load

Initial accuracy: ±0.5%

Accuracy over line, load, and temperature: ±2%

Stable with small 1 µF ceramic output capacitor

Fixed 3.3 V and 5.0V output voltage options

Adjustable output voltage option: 1.225V to 5.0 V

Current limit and thermal overload protection

Logic controlled enable

Space-saving MSOP package

ENHANCED PRODUCT FEATURES

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

TYPICAL APPLICATION CIRCUITS

GND

1

GND

2

GND

3

GND

4

8

7

6

GND

IN

OUT

EN

5

ADP1720-EP

FIXED

1µF

1µF

Figure 1. ADP1720-EP with Fixed Output Voltage, 5.0 V

GND

1

GND

2

GND

3

GND

4

8

7

6

ADJ

IN

OUT

EN

5

ADP1720-EP

ADJUSTABLE

1.225V(1 + R1/R2)

1µF

1µF

R1

R2

Figure 2. ADP1720-EP with Adjustable Output Voltage, 1.225 V to 5.0 V

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 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.

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.

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.