ADP3000

Rev. A | Page 5 of 16

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

SW1

3

SW2

4

FB (SENSE)*

8

SET

7

AO

6

GND

5

*FIXED VERSIONS

ADP3000

TOP VIEW

(Not to Scale)

Figure 4. 8-Lead Plastic DIP (N-8)

1

2

3

4

5

6

7

ADP3000

TOP VIEW

(Not to Scale)

NC = NO CONNECT

NC

ILIM

VIN

SW2

NC

SW1

NC

14

13

12

11

10

9

8

FB

SET

AO

GND

NC

NC

NC

Figure 5. 14-lead TSSOP (RU-14)

ADP3000

TOP VIEW

(Not to Scale)

SW1

3

SW2

4

FB (SENSE)*

SET

AO

GND

8

7

6

5

*FIXED VERSIONS

Figure 6. 8-Lead SOIC (R-8)

Table 3. Pin Function Descriptions

Mnemonic

Function

To limit the switch current to 400 mA, connect a 220 Ω resistor.

Input Voltage.

SW1

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 pin to go more than a diode drop below ground.

GND

Ground.

AO

Auxiliary Gain Block (GB) Output. Open collector can sink 300 µA. This pin can be left open if not used.

SET

Auxiliary Gain Amplifier Input. The amplifier’s positive input is connected to the SET pin, and its negative

input is connected to the 1.245 V reference. This pin 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,

the ADP3000-5, and the ADP3000-12, the pin goes directly to the internal resistor divider that sets the

output voltage.

COMPARATOR

GAIN BLOCK/

ERROR AMP

OSCILLATOR

DRIVER

1.245V

REFERENCE

ADP3000

SET

GND

FB

A0

SW1

SW2

A2

A1

Figure 7. Functional Block Diagram for Adjustable Version

COMPARATOR

GAIN BLOCK/

ERROR AMP

OSCILLATOR

DRIVER

1.245V

REFERENCE

R1

R2

ADP3000

SET

GND

SENSE

A0

SW1

SW2

A1

Figure 8. Functional Block Diagram for Fixed Version