1

1A Ultra Low Dropout Linear Regulator with

Programmable Current Limiting

ISL80121-5

The ISL80121-5 is a low dropout voltage, single output LDO with

programmable current limiting. This LDO operates from input

voltages of 2.2V to 6V. The ISL80121-5 has a nominal output

voltage of 5V. Other custom voltage options are available upon

request.

A sub-micron BiCMOS process is utilized for this product family to

deliver the best in class analog performance and overall value.

The programmable current limiting improves system reliability of

end applications. An external capacitor on the soft-start pin

provides an adjustable soft-starting ramp. The ENABLE feature

allows the part to be placed into a low quiescent current

shutdown mode.

This CMOS LDO will consume significantly lower quiescent

current as a function of load compared to bipolar LDOs, which

translates into higher efficiency and packages with smaller

footprints. Quiescent current is modestly compromised to

achieve a very fast load transient response.

Features

• High Accuracy Current Limit Programmable up to 1.75A

• Very Fast Transient Response

• Power-Good Output

•Programmable Soft-Start

• Over-Temperature Protection

•Small 10 Ld DFN Package

Applications

•USB devices

• Telecommunications and Networking

•Medical Equipment

• Instrumentation Systems

•Routers and Switchers

•Gaming

TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS

PART NUMBER

ISL80101

1.75A

No

ISL80101A

1.62A

Yes

ISL80121-5

0.75A

Yes

Typical Applications

ISL80121-5

10

9

ENABLE

7

SS

6

GND

10µF

5

PG

4

1

2

10µF

100kΩ

SENSE

3

8

ILIMIT 0.75A

=

(default)

5.4V ±10%

OFF

ON

5.0V ±1.8%

ISL80121-5

10

9

ENABLE

7

SS

6

GND

5.4V ±10%

10µF

OFF

ON

5

PG

4

1

2

5.0V ±1.8%

10µF

100kΩ

3

8

10kΩ

ILIMIT 0.75

2.9

RSET kΩ

()

-------------------------------------

+

=

10Ω

SENSE

April 22, 2011

FN7713.3

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners