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ADP1173

Micropower DC-DC Converter

Analog Devices 

ADP1173

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 V

SW1 Pin Voltage (VSW1) . . . . . . . . . . . . . . . . . . . . . . . . . 50 V

SW2 Pin Voltage (VSW2) . . . . . . . . . . . . . . . . . . –0.5 V to VIN

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

Model

ADP1173AN

ADP1173AR

ADP1173AN-3.3

ADP1173AR-3.3

ADP1173AN-5

ADP1173AR-5

ADP1173AN-12

ADP1173AR-12

Output

Voltage

ADJ

ADJ

3.3 V

3.3 V

5V

5V

12 V

12 V

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

Package

Options*

N-8

SO-8

N-8

SO-8

N-8

SO-8

N-8

SO-8

4X NICAD

OR

ALKALINE

CELLS

L1*

100µH

+

470µF

56Ω

1

2

ILIM VIN SW1 3

ADP1173

7 SET

AO 6

IRF7203

470kΩ

75kΩ

+5V

OUTPUT

AT 100mA

+

470µF

GND

5

SW2 FB 8

4

+

240Ω

470µF

24kΩ

*L1 = COILTRONICS CTX100-4

Figure 1. Step-Up or Step-Down Converter

PIN CONFIGURATIONS

N-8

8-Lead Plastic DIP

SO-8

8-Lead Plastic SO

ILIM 1

8 FB (SENSE)*

VIN 2 ADP1173 7 SET

SW1

3

TOP VIEW

(Not to Scale)

6

AO

SW2 4

5 GND

*FIXED VERSIONS

ILIM 1

VIN 2

SW1 3

SW2 4

8 FB (SENSE)*

ADP1173 7 SET

TOP VIEW

(Not to Scale) 6 AO

5 GND

*FIXED VERSIONS

PIN FUNCTION DESCRIPTIONS

Mnemonic Function

ILIM

VIN

SW1

SW2

GND

AO

SET

FB/SENSE

For normal conditions this pin is connected to

VIN. When lower current is required, a resistor

should be connected between ILIM and VIN.

Limiting the switch current to 400 mA is

achieved by connecting a 220 Ω resistor.

Input Voltage.

Collector Node of Power Transistor.

For step-down configuration, connect to VIN;

for step-up configuration, connect to an

inductor/diode.

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.

Ground.

Auxiliary Gain (GB) Output. The open

collector can sink 100 µA.

Gain Amplifier Input. The amplifier has

positive input connected to the SET pin and

negative input is connected to 1.245 V

reference.

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.

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.

WARNING!

ESD SENSITIVE DEVICE

REV. 0

–3–

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