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ST1S40 Fiches technique(PDF) 3 Page - STMicroelectronics

No de pièce ST1S40
Description  3 A DC step-down switching regulator
PDF  29 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST1S40 Fiches technique(HTML) 3 Page - STMicroelectronics

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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
VINA Unregulated DC input voltage
24
EN
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).
35
FB
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



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