ADP1109

–3–

REV. 0

PIN FUNCTION DESCRIPTIONS

Pin

Mnemonic

Function

Input Supply Voltage.

2, 5, 6

NC

No Connection.

3

SW

Collector Node of Power Transistor.

4

GND

Ground.

7

SHUTDOWN When logic low is applied to this pin,

oscillator is shut down.

8

FB(SENSE)

On the ADP1109A (Adjustable), this

pin goes directly to the comparator

input. On the ADP1109-3.3,

ADP1109-5 and ADP1109-12, this

pin is connected through the internal

resistor that sets the output voltage.

ORDERING GUIDE

Output

Package

Package

Model

Voltage

Description

Options

ADP1109AN

ADJ

Plastic DIP

N-8

ADP1109AR

ADJ

Small Outline IC

SO-8

ADP1109AN-3.3

3.3 V

Plastic DIP

N-8

ADP1109AR-3.3

3.3 V

Small Outline IC

SO-8

ADP1109AN-5

5 V

Plastic DIP

N-8

ADP1109AR-5

5 V

Small Outline IC

SO-8

ADP1109AN-12

12 V

Plastic DIP

N-8

ADP1109AR-12

12 V

Small Outline IC

SO-8

PIN CONFIGURATIONS

8-Lead Plastic DIP

(N-8)

TOP VIEW

(Not to Scale)

8

7

6

5

1

2

3

4

NC = NO CONNECT

*FIXED VERSIONS

NC

SW

FB(SENSE)*

SHUTDOWN

NC

NC

GND

ADP1109A

8-Lead SOIC

(SO-8)

TOP VIEW

(Not to Scale)

8

7

6

5

1

2

3

4

NC = NO CONNECT

*FIXED VERSIONS

NC

SW

GND

FB(SENSE)*

SHUTDOWN

NC

NC

ADP1109A

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily

accumulate on the human body and test equipment and can discharge without detection.

Although the ADP1109 features proprietary ESD protection circuitry, permanent damage may

occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage, V

–0.4 V to 20 V

SW Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . –0.4 V to 50 V

Shutdown Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 V

Switch Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 A

Maximum Power Dissipation

. . . . . . . . . . . . . . . . . . 300 mW

Operating Temperature Range . . . . . . . . . . . . 0

°C to +70°C

Storage Temperature Range . . . . . . . . . . . . –65

°C to +150°C

Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . +300

°C

*This is a stress rating only; operation beyond these limits can cause the device to

be permanently damaged.