S-8355 Seiko Instruments, S-8355 Datasheet - Page 2

• Manufacturer Part Number: S-8355
• Description: (S-8355 - S-8358) PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR
• Manufacturer: Seiko Instruments

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(1) S-8357/58 Series B, H and F Types
2
(3) S-8357/58 Series E, J, G and P Types
EXT
EXT
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
S-8355/56/57/58 Series
Block Diagrams
(Without Shutdown Function)
(V
DD
/ V
OUT
Soft start built-in
reference power
supply
Soft start built-in
reference power
supply
Separate Type)
PWMcontrol circuit or
PWM / PFM switching
control circuit
PWMcontrol circuit or
PWM / PFM switching
control circuit
Oscillation circuit
Oscillation circuit
Figure 1
Figure 3
VDD
Phase
compensation
circuit
Phase
compensation
circuit
IC internal
power supply
IC internal
power
supply
+
−
+
−
VOUT
Seiko Instruments Inc.
VOUT
VSS
VSS
(2) S-8357/58 Series B, H, F and N Types
(4) S-8355/56 Series K, L, M and Q Types
EXT
EXT
(With Shutdown Function)
(With Shutdown Function, V
ON
Soft start built-in
reference power
supply
Soft start built-in
reference power
supply
ON
/
PWMcontrol circuit or
PWM / PFM switching
control circuit
OFF
PWMcontrol circuit or
PWM / PFM switching
control circuit
Oscillation circuit
Oscillation circuit
/
OFF
Figure 2
Figure 4
Phase
compensation
circuit
Phase
compensation
circuit
VDD
DD
/ V
IC internal
power
supply
IC internal
power
supply
OUT
Separate Type)
+
−
+
−
VOUT
Rev.6.6
VOUT
VSS
VSS
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