S-8355 Seiko Instruments, S-8355 Datasheet - Page 33

• 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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Rev.6.6
Standard Circuits
（1） S-8357BxxMA, S-8357BxxUA, S-8358BxxMA, S-8358BxxUA
（2） S-8357BxxMC, S-8357FxxMC / BD, S-8357HxxMC / BD, S-8357NxxMC / BD,
（3） S-8357ExxMC, S-8357GxxMC / BD, S-8357JxxMC / BD, S-8357PxxMC / BD,
STEP-UP, SUPER-SMALL PACKAGE, 600 kHz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER
Remark The power supply for the IC chip is from the VOUT pin.
Remark The power supply for the IC chip is from the VOUT pin.
Remark The power supply for the IC chip is from the VDD pin.
S-8358BxxMC, S-8358FxxMC / BD, S-8358HxxMC / BD, S-8358NxxMC / BD
S-8358ExxMC, S-8358GxxMC / BD, S-8358JxxMC / BD, S-8358PxxMC / BD
_00
V
V
IN
IN
V
IN
C
C
+
−
IN
+
−
IN
C
+
−
L
L
IN
2200 pF
2200 pF
1 KΩ
1 KΩ
2200 pF
1 KΩ
EXT
EXT
EXT
Seiko Instruments Inc.
Soft start built-in
reference power
supply
PWM control circuit or
PWM / PFM switching
control circuit
Soft start built-in
reference power
supply
ON
PWM control circuit or
PWM / PFM switching
control circuit
SD
Oscillation
PWM control circuit or
PWM / PFM switching
control circuit
Soft start built-in
reference power
supply
/
circuit
OFF
Figure 20
Figure 21
Figure 22
SD
SD
Oscillation
circuit
Oscillation
circuit
Phase
compensating
circuit
Phase
compensating
circuit
VDD
IC
internal
power
supply
Phase
compensating
circuit
IC
internal
power
supply
IC
internal
power
supply
+
−
+
−
+
−
S-8355/56/57/58 Series
VOUT
VOUT
VSS
VOUT
C
VSS
VSS
C
R
R
C
A
B
C
+
−
L
+
−
L
C
+
−
L
33