ADP3000

–3–

REV. 0

PIN 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 col-

lector can sink 300

µA. It can be left open

if not used.

SET

SET Gain amplifier input. The amplifier’s

positive input is connected to SET pin and its

negative input is connected to 1.245 V. It can

be left open if not used.

FB/SENSE

On the ADP3000 (adjustable) version, this pin

is connected to the comparator input. On the

ADP3000-3.3, ADP3000-5 and ADP3000-12,

the pin goes directly to the internal resistor

divider that sets the 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 ADP3000 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.

ABSOLUTE MAXIMUM RATINGS

Input Supply Voltage, Step-Up Mode . . . . . . . . . . . . . . . 15 V

Input Supply Voltage, Step-Down Mode . . . . . . . . . . . . . 36 V

SW1 Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V

Feedback Pin Voltage (ADP3000) . . . . . . . . . . . . . . . . . . 5.5 V

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

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

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

°C to +70°C

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

°C to +150°C

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

°C

Thermal Impedance

SO-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

°C/W

N-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

°C/W

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)

ADP3000

SW1

SW2

FB (SENSE)*

SET

AO

GND

* FIXED VERSIONS

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

ADP3000

SW1

SW2

FB (SENSE)*

SET

AO

GND

* FIXED VERSIONS

ORDERING GUIDE

Output

Package

Model

Voltage

Option

ADP3000AN-3.3

3.3 V

N-8

ADP3000AR-3.3

3.3 V

SO-8

ADP3000AN-5

5 V

N-8

ADP3000AR-5

5 V

SO-8

ADP3000AN-12

12 V

N-8

ADP3000AR-12

12 V

SO-8

ADP3000AN

Adjustable

N-8

ADP3000AR

Adjustable

SO-8

N = plastic DIP, SO = small outline package.

Figure 3a. Functional Block Diagram for Adjustable Version

Figure 3b. Functional Block Diagram for Fixed Version

COMPARATOR

GAIN BLOCK/

ERROR AMP

OSCILLATOR

DRIVER

A2

1.245V

REFERENCE

ADP3000

SET

GND

FB

A0

SW1

SW2

A1

COMPARATOR

GAIN BLOCK/

ERROR AMP

OSCILLATOR

DRIVER

A1

1.245V

REFERENCE

R1

R2

ADP3000

SET

GND

SENSE

A0

SW1

SW2