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http://www.union-ic.com

Rev.01 May.2012

2/10

UM3521DA

Ordering Information

Part Number

Packaging Type

Marking Code

Shipping Qty

UM3521DA

DFN6

ADA

3000pcs/7Inch

Tape & Reel

Pin Description

Pin

Number

Symbol

Function

1

SW

Switching Pin

2

MODE

Mode Select Pin. This pin is used to put the UM3521DA into fixed

frequency PWM mode by pulling MODE pin high.

3

FB

Pin for Feedback Voltage

4

EN

Enable Pin (Active with “H”)

5

VIN

Power Supply Pin

6

GND

Ground Pin

Absolute Maximum Ratings

Symbol

Parameter

Value

Unit

Input Voltage

-0.3 to +6.0

V

FB Voltage

V

EN Voltage

V

MODE Voltage

V

SW Voltage

V

Operating Temperature

-40 to +85

°C

Storage Temperature Range

-65 to +150

°C