ADP3050

–3–

REV. 0

PIN FUNCTION DESCRIPTION

Pin

Name

Function

1

SWITCH

This is the emitter of the internal NPN

power switch. The voltage at this pin switches

2

BOOST

This pin is used to provide a boosted voltage

NPN power switch. With the higher drive

voltage, the power switch can be saturated,

greatly reducing the switch power losses.

3

BIAS

Connect this pin to the regulated output

voltage to maximize system efficiency.

When this pin is above 2.7 V, most of the

ADP3050 operating current will be taken

from the output instead of the input supply.

Leave unconnected if not used.

4

FB

This feedback pin senses the regulated output

voltage. Connect this pin directly to the out-

put (fixed output versions).

5

COMP

This pin is used to compensate the regulator

with an external resistor and capacitor. This

pin can be used to override the control loop,

but the voltage on this pin should not exceed

about 2 V, as the pin is internally clamped to

ensure a fast transient response. Use a pull-up

resistor if this pin is to be pulled higher than 2 V.

6

SD

Use this pin to turn the device on and off. If

this feature is not needed, tie this pin directly

7

GND

Connect this pin to local ground plane.

8

IN

Connect this pin to the input supply voltage.

An input bypass capacitor must be placed

close to this pin to ensure proper regulator

operation.

ABSOLUTE MAXIMUM RATINGS

*

IN Voltage

Steady State . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +30 V

Peak (<100 ms) . . . . . . . . . . . . . . . . . . . . . –0.3 V to +60 V

BOOST Voltage

Steady State . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +45 V

Peak (<100 ms) . . . . . . . . . . . . . . . . . . . . . –0.3 V to +65 V

SD, BIAS Voltage . . . . . . . . . . . . . . . . . –0.3 V to IN + 0.3 V

FB Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +8 V

COMP Voltage . . . . . . . . . . . . . . . . . . . –0.3 V to IN + 0.3 V

SWITCH Voltage . . . . . . . . . . . . . . . . . –0.3 V to IN + 0.3 V

Operating Ambient Temperature Range . . . . –40

°C to +85°C

Operating Junction Temperature Range . . . –40

°C to +125°C

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

°C to +150°C

θ

°C/W

Lead Temperature Range (Soldering, 60 sec.) . . . . . . . . 300

°C

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

be permanently damaged. Unless otherwise specified, all voltages are referenced

to GND

PIN CONFIGURATION

8-Lead SOIC

(R-Suffix)

TOP VIEW

(Not to Scale)

8

7

6

5

1

2

3

4

SWITCH

BOOST

BIAS

FB

IN

GND

SD

COMP

ADP3050

ORDERING GUIDE

Output

Temperature

Model

Voltage

Range

Package

*

ADP3050AR

ADJ

–40

SO-8

ADP3050AR-3.3

3.3 V

–40

SO-8

ADP3050AR-5

5.0 V

–40

SO-8

*SO = Small Outline Package

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 this device 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.