LSP5523

Document number: DS44073 Rev. 7 - 2

3 of 17

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May 2022

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LSP5523

Pin Assignment

1

8

7

6

5

2

3

4

SS

EN

C O M P

FB

BS

V IN

SW

G N D

( T O P V ie w )

E x p o s e d

P a d o n

B a c k s id e

E S O P - 8 L

Pin Descriptions

Pin Name

Name

Pin Description

1

BS

Bootstrap. This pin acts as the positive rail for the high-

side switch’s gate driver.

Connect a 0.01uF capacitor between BS and SW.

2

VIN

Input Supply. Bypass this pin to GND with a low ESR capacitor. See Input

Capacitor in the Application Information section.

3

SW

Switch Output. Connect this pin to the switching end of the inductor.

4

GND

Ground.

5

FB

Feedback Input. The voltage at this pin is regulated to 0.925V. Connect to the

resistor divider between output and ground to set output voltage.

6

COMP

Compensation Pin. See Stability Compensation in the Application Information

section.

7

EN

Enable Input. When higher than 2.7V, this pin turns the IC on. When lower than

1.1V, this pin turns the IC off. Output voltage is discharged when the IC is off.

This pin should not be left open. Recommend to put a 200K

Ω pull-up resistor to

Vin for startup.

8

SS

Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor

from SS to GND to set the soft-start period. A 0.1uF capacitor sets the soft-start

period to 13ms. To disable the soft-start feature, leave SS unconnected.

—

Exposed Pad

Exposed Pad. Need to connect to GND pin.