Pin Descriptions

Pin Number

Name

Function

1

PGND

Power Ground

2

IN

Supply Input.

3

EN

Enable Control. Connect to a logic high level to enable the IC. Connect to a logic low level

to disable the IC. When unused, connect EN pin to IN (do not leave pin floating).

4

COMP

Error Amplifier Compensation Node.

5

AGND

Analog Ground

6

FB

Feedback Input. Connect this pin a res istor divider from the output to set the output

voltage. FB is regulated to 1.262V.

7

SS

Sof t Start Control Input. Connect a capacitor from this pin to Ground to set soft-start

timing duration. SS is discharged to ground in shutdown. SS may be left unconnected if

soft start is not desired.

8

SW

Switch Output. Connec t this pin to the inductor and the schottky diode. To minimize E MI,

minimize the PCB trace path between this pin and the input bypass capac itor.

E xposed

PAD

Connected to gound

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

.

.

.

SW to Ground...................................

VIN, EN, FB, SS, COMP to Ground........................

......................................................

...................................................

.........

..........

–0.3V to 28V

–0.3V to 6.5V

Continuous SW Current..............Internally Limited

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

–40 C to 150 C

Storage Temperature Range

–55 C to 150 C

Lead Temperature (Soldering, 10 sec)

300 C











Recommended Operating Conditions

Junction Temperature

40

to 125

-

...................

.....................

℃

℃

-

℃

℃

Ambient Temperature

40

to 85

Thermal Information

Parameter

Package

Symbol

Maximum

Unit

Thermal Resistance

(Junction to Case)

SOP-8(EP )

θ

JC

75

Thermal Resistance

(Junction to Ambient)

SOP-8(EP )

θ

JA

180

℃/W

,

Power Analog Microelectronics Inc

www.poweranalog.com

02/2012 Rev1.1

PAM2421,PAM2422,PAM2423

3A,4.5A,5.5A PWM Step-Up DC/DC Converter