s-8521b51mc-aukt2g Seiko Instruments Inc., s-8521b51mc-aukt2g Datasheet - Page 3

• Manufacturer Part Number: s-8521b51mc-aukt2g
• Description: Step-down, Pwm Control Or Pwm / Pfm Switchable Switching Regulator Controller
• Manufacturer: Seiko Instruments Inc.

Rev.8.3
Block Diagrams
1. S-8520 Series
2. S-8521 Series
Remark All the diodes in the figure are parasitic diodes.
Remark All the diodes in the figure are parasitic diodes.
STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLOR
_00
V
V
I N
I N
+
+
C
C
I N
I N
Tr
Tr
SD
SD
EXT
EXT
VIN
VIN
Seiko Instruments Inc.
ON
ON
Oscillation
Oscillation
Figure 2
Figure 1
/
/
circuit
circuit
OFF
OFF
switching control
PWM control
PWM/PFM
circuit
circuit
Reference voltage source
Reference voltage source
with soft-start
with soft-start
L
L
V
V
ON
ON
/
/
O FF
OFF
−
−
+
+
S-8520 / 8521 Series
VOUT
VOUT
VSS
VSS
+
+
C
C
OUT
OUT
3