AOZ1905

Rev. 1.5 December 2008

www.aosmd.com

Page 2 of 16

Ordering Information

All AOS products are offered in packages with Pb-free plating and compliant to RoHS standards.

Parts marked as Green Products (with “L” suffix) use reduced levels of Halogens, and are also RoHS compliant.

Please visit www.aosmd.com/web/quality/rohs_compliant.jsp for additional information.

Pin Configuration

Pin Description

Part Number

Operating Temperature Range

Package

Environmental

AOZ1905DI

-40°C to +85°C

3x3 DFN-10

Green Product

AOZ1905FI

-40°C to +85°C

MSOP-8

RoHS Compliant

AOZ1905FIL

-40°C to +85°C

MSOP-8

Green Product

Pin Name

Pin Number

Pin Function

DFN-10

MSOP-8

COMP

1

1

Compensation Pin. COMP is the output of the internal transconductance error

amplifier. Connect a RC network from COMP to GND to compensate the loop.

FB

2

2

Feedback Input. Connect a resistive divider between the boost regulator output

and ground with the center tap connected to FB to set output voltage.

EN

3

3

Enable Input. Pull EN high to enable the boost regulator and pull EN low to dis-

able the regulator.

GND

4, 5

4

System Ground.

LX

6, 7

5

Boost Regulator Switching Node.

IN

8

6

Input Supply Pin.

FSEL

9

7

Frequency Select Pin. The switching frequency is 1.2MHz when FSEL is

connected to IN, and 600kHz when FSEL is connected to ground.

SS

10

8

Soft-Start Pin. Connect a capacitor from SS to GND to set the soft-start period.

SS

FSEL

IN

LX

1

2

3

4

COMP

FB

EN

GND

MSOP-8

(Top View)

DFN-10

(Top View)

8

7

6

5

SS

FSEL

IN

LX

LX

1

2

3

4

5

COMP

FB

EN

GND

GND

10

9

8

7

6