Copyright

© ANPEC Electronics Corp.

Rev. A.4 - Aug., 2005

APW1172

www.anpec.com.tw

3

Pin Function Description

No.

PIN

Description

1

OUT

Regulator Output.

2

SYNC

Master/Slave synchonization.

3

INH

A logical signal (active high) disables the device. If INH not used the pin must be

connected to GND. When it is open an internal pull-up disable the device.

4

COMP

E/A output for frequency compensation.

5

FB

Feedback input. Connecting directly to this pin results in an output voltage of

1.235V(APW1172). An external resistive divider is required for higher output

voltages.

6

VREF

3.3V reference voltage output, no Capacitor Is requested for stability.

7

GND

Ground.

8

VCC

Unregulated DC input voltage.

Thermal Characteristics

Symbol

Parameter

Value

Unit

Junction to ambient thermal resistance in free air

45.7

°C/W

Electrical Characteristics

APW1172

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

*

4.7

22

V

UVLO threshold voltage

*

3.8

4.2

4.6

V

Hysteresis

0.3

V

Dropout voltage

*

1.0

1.2

V

Maximum limiting current

*

3.3

3.8

4.3

A

*

200

250

300

Switching frequency

Main design

205

250

295

KHz

Duty cycle

0

100

%

* The area of the thermal pad is 4.5mm X 2mm and the GND plane is 60mm X 60mm. Connect the thermal

°C.