S-8540 Datasheet, PDF (5/36 Pages) Seiko Instruments Inc – STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

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