ZXLD1356Q

Document number: DS37077 Rev. 2 - 2

2 of 28

www.diodes.com

October 2015

© Diodes Incorporated

ZXLD1356Q

Q

Pin Descriptions

Pin

Name

Pin Number

Function

TSOT25

V-DFN3030-6

LX

1

1

Drain of NDMOS Switch

GND

2

2, 5

Ground (0V)

ADJ

3

3

Multi-Function On/Off and Brightness Control Pin:



Leave floating for normal operation.



Drive to voltage below 0.2V to turn off output current





Connect a capacitor from this pin to ground to define soft-start time.

Soft-start time is approximately 0.2ms/nF

4

4

5

6

Input Voltage (6V to 60V)

Decouple to ground with 4.7µF of higher X7R ceramic capacitor close to device

Pad

—

Pad

Exposed Pad (EP) - connected to device substrate.

To improve thermal impedance of package the EP must be connected to power ground but should

not be used as the 0V (GND) current path.

It can be left floating but must not be connected to any other voltage other than 0V.

Functional Block Diagram

Figure 1 Block Diagram - Pin Connections Shown for TSOT25 Package

Low voltage

detector

Voltage

regulator

LX

MN

L1

D1

Adj

Gnd

50K

20K

1.25V

1.35V

0.2V

600KHz

+

-

+

-

+

-

R4

R5

R2

R3

R1

2

3

5

4

1

D1

+

-

C1

4.7

mF

5V