S-8331 Seiko Instruments USA, S-8331 Datasheet - Page 16

• Manufacturer Part Number: S-8331
• Description: Step-Up Switching Regulator (DC/DC Converter ICs)
• Manufacturer: Seiko Instruments USA

16
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL SWITCHING REGULATOR
S-8330/8331 Series
When taking into consideration ESR (Electric Series Resistance) RESR of IOUT and COUT during t1:
When substituting equation (15) for equation (11):
The effective methods to reduce the ripple voltage are to maximize the capacitance of the capacitor
connected to the output pin and to minimize ESR.
V
P
−
V
P
P
=
−
P
C
Δ
=
OUT
Q
I (
1
PK
=
I 2
−
C
PK
I
OUT
OUT
1
)
2
•
⎛
⎜
⎝
•
I
C
PK
t
OFF
OUT
+
2
I
OUT
+
⎛
⎜
⎝
I
⎞
• ⎟
⎠
PK
1 t
+
Seiko Instruments Inc.
2
+
I
OUT
⎛
⎜
⎝
I
PK
⎞
• ⎟
⎠
+
2
R
I
OUT
ESR
⎞
• ⎟
⎠
R
ESR
−
I
OUT
C
OUT
•
t
1
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