3

Absolute Maximum Ratings

These are stress ratings only and functional operation is not implied

Exposure to absolute

maximum ratings for prolonged time periods may affect device reliability

All voltages are with

respect to ground

.

.

.

Input Voltage..................................-0.3V to 6.0V

EN, FB Pin Voltage.............................-

SW Pi n Voltage......................-

0.3V to V

0.3V to

V +0.3V

Junction Temperature.................................150°C

Storage Temperature Range...........-65°C to 150°C

Soldering Temperature......................300°C 5sec

()

IN

IN

,

Recommended Operating Conditions

Supply Voltage................................2.5V to 5.5V

°C

°C

°C

°C

Operation Temperature Range.........-40

to 85

Junction Temperature Range........-40

to 125

Thermal Information

Parameter

Package

Symbol

Maximum

Unit

SOT23-5

Note

130

DFN 2x2

20

Thermal Resistance

(JunctiontoCase)

QFN 3x3

12

SOT23-5

102

DFN 2x2

68

Thermal Resistance

(Junction to Ambient)

QFN 3x3

θ

JA

34

°C/W

SOT23-5

400

DFN 2x2

980

Internal Power Dissipation

QFN 3x3

P

D

1470

mW

,

Power Analog Microelectronics Inc

www.poweranalog.com

PAM2309

1A Step-Down DC-DC Converter

Note:

The maximun output current for SOT23-5 package is limited by internal power dissipation capacity as

described in Application Information hereinafter.

08/2009 Rev 1.1