ADP1173

–3–

REV. 0

ABSOLUTE MAXIMUM RATINGS*

Feedback Pin Voltage (ADP1173) . . . . . . . . . . . . . . . . . . . 5 V

Sense Pin Voltage (ADP1173, –3.3, –5, –12) . . . . . . . . . 36 V

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

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

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

°C to +70°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

ratings for extended periods of time may affect device reliability.

ORDERING GUIDE

Output

Package

Model

Voltage

Options*

ADP1173AN

ADJ

N-8

ADP1173AR

ADJ

SO-8

ADP1173AN-3.3

3.3 V

N-8

ADP1173AR-3.3

3.3 V

SO-8

ADP1173AN-5

5 V

N-8

ADP1173AR-5

5 V

SO-8

ADP1173AN-12

12 V

N-8

ADP1173AR-12

12 V

SO-8

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

SW1

ADP1173

FB

SW2

GND

4

5

1

2

3

8

7

SET

+

L1*

100µH

470µF

75k

Ω

56

Ω

*L1 = COILTRONICS CTX100-4

4X NICAD

OR

ALKALINE

CELLS

240

Ω

470µF

+

470k

Ω

24k

Ω

IRF7203

+

470µF

+5V

OUTPUT

AT 100mA

Figure 1. Step-Up or Step-Down Converter

PIN CONFIGURATIONS

N-8

SO-8

8-Lead Plastic DIP

8-Lead Plastic SO

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 ADP1173 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.

AO

SW1

GND

SW2

*FIXED VERSIONS

1

2

3

4

8

7

6

5

ADP1173

TOP VIEW

(Not to Scale)

FB (SENSE)*

SET

AO

SW1

GND

SW2

*FIXED VERSIONS

1

2

3

4

8

7

6

5

ADP1173

TOP VIEW

(Not to Scale)

FB (SENSE)*

SET

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 Node of Power Transistor.

for step-up configuration, connect to an

inductor/diode.

SW2

Emitter Node of Power Transistor. For step-

down configuration, connect to inductor/

diode; for step-up configuration, connect to

ground. Do not allow this pin to drop 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 the SET pin and

negative input is connected to 1.245 V

reference.

FB/SENSE

On the ADP1173 (adjustable) version this pin

is connected to the comparator input. On the

ADP1173-3.3, ADP1173-5 and ADP1173-12,

the pin goes directly to the internal application

resistor that sets the output voltage.