Datasheet

DocID17928 Rev 5 3/29
ST1S40 Pin settings
29
1 Pin settings
1.1 Pin connection
1.2 Pin description
Figure 2. Pin connection (top view)
8
6
4
7
3
2
5
1
VINA
EN
FB
GND
PGND
SW
VINSW
NC
8
45
1
VINA
EN
FB
GND
PGND
SW VINSW
AGND
VFQFPN
8
6
4
7
3
2
5
1
VINA
EN
FB
GND
PGND
SW
VINSW
NC
HSOP8 SO8-BW
9
9
HSOP-8
Table 1. Pin description
No.
Type Description
VFQFPN
and HSOP-8
S08-BW
13
V
INA
Unregulated DC input voltage
24EN
Enable input. With EN higher than 1.2 V the device in ON and with EN lower
than 0.4 V the device is OFF (ST1S40Ixx).
35FB
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 Vout to the FB pin.
4 6 AGND Ground
5 - NC It can be connected to ground
6 8 VINSW Power input voltage
7 1 SW Regulator output switching pin
8 2 PGND Power ground
- 7 Ground
9 - ePad Exposed pad mandatory connected to ground