S-8550AA-M5T1X Datasheet, PDF (4/31 Pages) Seiko Instruments Inc – RECTIFICATION, PWM CONTROL SWITCHING REGULATORS

STEP-DOWN, BUILT-IN FET, SYNCHRONOUS RECTIFICATION, PWM CONTROL SWITCHING REGULATORS
S-8550 Series
Rev.5.0_01
 Pin Configurations
1. SOT-23-5
Top view
54
123
Figure 3
Pin No.
1
2
3
4
5
Symbol
VIN
VSS
ON/OFF
FB
CONT
Table 1
Description
IC power supply pin
GND pin
Shutdown pin
“H” : Power on (normal operation)
“L” : Power off (standby)
Output voltage feedback pin
External inductor connection pin
2. SNT-8A
Top view
1
8
2
7
3
6
4
5
Figure 4
Table 2
Pin No.
Symbol
Description
1
FB
Output voltage feedback pin
2
NC^*1
No connection
3
VSS^*2
Small signal GND Pin
Shutdown pin
4
ON/OFF
“H”：Power on (normal operation)
“L”：Power off (standby)
5
VIN
IC power supply pin
6
PVSS^*2
Power GND pin
7
NC^*1
No connection
8
CONT
External inductor connection pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN, VSS or PVSS.
*2. Connect VSS and PVSS to GND.
4