S-8520 Seiko Instruments, S-8520 Datasheet - Page 2

• Manufacturer Part Number: S-8520
• Description: (S-8520 / S-8521) PWM Control and PFM Control Step DOwn Switching Regulator Controllers
• Manufacturer: Seiko Instruments

PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
S-8520/8521 Series
S - 852 X X XX MC - XXX
2
Block Diagram:
Selection Guide:
1. Product Name
V
IN
C
IN
- T2
Note: The diode inside the IC is a parasitic diode.
Tr
SD
EXT
VIN
Seiko Instruments Inc.
Tape specifications .
Product name abbreviation.
Package name abbreviation.
Output voltage x 10
Product type:
Control system
Figure 1 Block Diagram
ON / OFF
A: Oscillation frequency of 180 kHz, with overload protection circuit.
B: Oscillati on frequency of 180 kHz, without overload protection circuit.
C: Oscillation frequency of 60 kHz, with overload protection circuit.
D: Oscillation frequency of 60 kHz, without overload protection circuit.
E: Oscillation frequency of 300 kHz, with overload protection circuit.
F: Oscillation frequency of 300 kHz, without overload protection circuit.
Oscillation
Circuit
Switched Control
PWM or
PWM/PFM-
Circuit
0: PWM control
1: PWM/PFM-switched control
Reference Voltage
Source with Soft Start
L
V
ON / OFF
+
-
VOUT
VSS
C
Rev.7.4
OUT
_10