S-8540 SII [Seiko Instruments Inc], S-8540 Datasheet - Page 5

• Manufacturer Part Number: S-8540
• Description: STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
• Manufacturer: SII [Seiko Instruments Inc]

Rev.3.2
Pin Configuration
STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
2
1
3
4
_00
8-Pin MSOP
TOP view
Figure 3
8
7
6
5
*1.
Pin No.
1
2
3
4
5
6
7
8
Seiko Instruments Inc.
The NC pin is electrically open.
The NC pin can be connected to VIN and VSS.
Pin Name
ON/ OFF
CVREF
SENSE
VOUT
VSS
NC
EXT
VIN
FB
*1
Feed back pin (B, D types)
GND pin
Connection pin for external transistor
IC power supply pin
Bypass capacitor connection pin for
reference voltage source
Shutdown pin
Soft-start capacitor connection pin
None connected (A, C types)
Output voltage pin
Current limit detection pin
• Normal operation (step-down operation)
• All circuit halts (no step-down operation)
Table 3
Pin Description
S-8540/8541 Series
5