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http://www.union-ic.com Rev.05 Mar.2016

2/15

UM1665

Ordering Information

Part Number

Packaging Type

Marking Code

Shipping Qty

UM1665S

SOT23-5

PHO

3000pcs/7 Inch

Tape & Reel

UM1665DA

TDFN6 3.0×3.0

1665

3000pcs/13 Inch

Tape & Reel

Pin Description

Pin Number

Symbol

Function

UM1665S

UM1665DA

1

6

SW

Connect the inductor and the Schottky diode to this pin.

This is the switch pin and is connected to the drain of the

internal power MOSFET.

2

2

GND

Ground

3

4

FB

This is the feedback pin of the device. Connect this pin to

the external voltage divider to program the desired output

voltage.

4

3

EN

This is the enable pin of the device. Pulling this pin to

ground forces the device into shutdown mode reducing the

supply current to less than 1µA. This pin should not be left

floating and needs to be terminated.

5

1

VIN

Supply Voltage Pin

-

5

NC

Not Connected

Absolute Maximum Ratings

Over operating free-air temperature (unless otherwise noted) (Note 1)

Symbol

Parameter

Value

Unit

Supply Voltage on VIN (Note 2)

-0.3 to +7.0

V

Voltages on FB, EN (Note 2)

V

Switch Voltage on SW (Note 2)

30

V

Continuous Power Dissipation

SOT23-5

0.35

W

TDFN6 3.0×3.0

1.4

Operating Junction Temperature

-40 to +150

°C

Storage Temperature Range

-65 to +150

°C

Maximum Lead Temperature for Soldering 10

Seconds

+260

°C

Note 1: Stresses beyond those listed under absolute maximum ratings may cause permanent

damage to the device. These are stress ratings only, and functional operation of the

device at these or any other conditions beyond those indicated under recommended

operating conditions is not implied. Exposure to absolute-maximum-rated conditions for

extended periods may affect device reliability.

Note 2: All voltage values are with respect to network ground terminal.