ADP1108

–3–

REV. 0

ABSOLUTE MAXIMUM RATINGS*

Feedback Pin Voltage (ADP1108) . . . . . . . . . . . . . . . . +5.5 V

Sense Pin Voltage (ADP1108, 3.3, 5, 12) . . . . . . . . . . . +36 V

Maximum Power Dissipation . . . . . . . . . . . . . . . . . . 500 mW

Maximum Switch Current . . . . . . . . . . . . . . . . . . . . . . . . 1.5 A

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

°C to 170°C

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

°C to +150°C

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

°C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the

device at these or any other conditions above those listed in the operational

sections of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

ORDERING GUIDE

Model

Output Voltage

Package*

ADP1108AN

ADJ

N-8

ADP1108AR

ADJ

SO-8

ADP1108AN-3.3

3.3 V

N-8

ADP1108AR-3.3

3.3 V

SO-8

ADP1108AN-5

5 V

N-8

ADP1108AR-5

5 V

SO-8

ADP1108AN-12

12 V

N-8

ADP1108AR-12

12 V

SO-8

*N = Plastic DIP, SO = Small Outline Package.

PIN CONFIGURATIONS

8-Lead Plastic DIP

8-Lead SOIC

(N-8)

(SO-8)

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

ADP1108

SW1

SW2

FB (SENSE)*

SET

AO

GND

* FIXED VERSIONS

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

ADP1108

SW1

SW2

FB (SENSE)*

SET

AO

GND

* FIXED VERSIONS

PIN FUNCTION DESCRIPTIONS

Mnemonic

Function

For normal conditions this pin is connected to

Limiting the switch current to 400 mA is

achieved by connecting a 220

Ω resistor.

Input Voltage.

SW1

Collector of Power Transistor. For step-down

configuration, connect to an inductor/diode.

SW2

Emitter of Power Transistor. For step-down

configuration, connect to inductor/diode. For

step-up configuration, connect to ground. Do

not allow this pin to go more than a diode

drop below ground.

GND

Ground.

AO

Auxiliary Gain (GB) Output. The open

collector can sink 100

µA.

SET

Gain Amplifier Input. The amplifier has

positive input connected to SET pin and

negative input connected to 1.245 V reference.

FB/SENSE

On the ADP1108 (adjustable) version this pin

is connected to the comparator input. On the

ADP1108-3.3, ADP1108-5 and ADP1108-12,

the pin goes directly to the internal application

resistor that set output voltage.

WARNING!

ESD SENSITIVE DEVICE

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 ADP1108 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.