ST1S50 datasheet(4/29 Pages) STMICROELECTRONICS

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Pin settings

ST1S50

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DocID025723 Rev 4

Pin settings

1.1

Pin connection

Figure 2. Pin connection (top view)

1.2

Pin description

GNDP

VINSW

VINA

GNDA

BST

EN_SS

COMP

ST1S50PUR

Table 1. Pin description

No.

Type

Description

GNDP

Power ground. This pin has to be connected to the exposed pad of the

device as shown in Figure 11: PCB layout on page 22.

VINSW

Power input voltage

VINA

Input voltage

GNDA

Ground. This pin has to be connected to the exposed pad of the device as

shown in Figure 11: PCB layout.

5FB

Feedback input. Connecting the output voltage directly to this pin the

output voltage is regulated at 0.8 V. To have higher regulated voltages an

external resistor divider is required from the VOUT to the FB pin.

6COMP

Error amplifier output; the RC network connected to this pin stabilizes the

loop.

7EN_SS

Enable and soft-start pin: the capacitor connected to this pin programmes

the soft-start time.

Power Good pin

BST

Bootstrap pin: the capacitor connected between SW and BST allows the

proper high-side switch turn on.

Output switching pin.

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