S-8335A120FT-TB-G Seiko Instruments, S-8335A120FT-TB-G Datasheet - Page 15

• Manufacturer Part Number: S-8335A120FT-TB-G
• Description: IC REG SW 3CH STEP UP 24-TSSOP
• Manufacturer: Seiko Instruments
• Type: Step-Up (Boost), Invertingr

Specifications of S-8335A120FT-TB-G

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 6.66 ~ 12.41 V, -4.61 ~ -8.59 V
• Frequency - Switching: 100kHz
• Voltage - Input: 2.4 ~ 5 V
• Operating Temperature: -20°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Power - Output: 650mW
• Output Voltage: 12.41 V
• Operating Temperature Range: - 20 C to + 70 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Rev.6.0
The amount of electric charge
The following is obtained by substituting equation (9) into equation (12)
The voltage rise (V
The following is obtained when the I
Resistance (ESR) of C
The following is obtained when equation (11) is substituted into equation (15):
Effective ways to reduce the ripple voltage are to increase the capacitance of the capacitor connected
to the output pin and to reduce its ESR.
Note:
Although this IC has an on-chip soft-start circuit, a rush current flows because the output capacitor
(C
Therefore, care must be taken.
OUT
_01
=
∆
V
V
V
∆
) and load capacitance component are charged up via the coil and diode on power application.
Q
Q
I
P-P
P-P
P-P
STEP-UP, FOR LCD BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR
PK
1
1
=
=
•



∫
t
=
=
=
0
I
t
1
1
PK
−
C
C
(
I
∆
∆
I
L
V
−
OUT
OUT
PK
Q
Q
dt
OUT
1
2
1
1
I 2
−
(
=
I
=
=
P-P
I
PK
PK
OUT
+
I
C
C
PK
) due to
L
V
−
OUT
OUT
1
1
OUT
)
D
2
I
•
OUT
−
∫
0
•
t
, are taken into consideration:
•
•
1
V
C






t
)
IN
OFF
OUT



I
I
dt
PK
PK
•
∆
•
t
∆
−
Q
1
1
2
+
+
Q
+
2
2
=
1
V
t
I
I



1
1



OUT
OUT
is as follows:
OUT
I
2
charged in C
I
PK
PK
OUT
Seiko Instruments Inc.






+
+
+
2
.........................................................................................
•
•
2
L
V
I
t
t
I
1
1
OUT
consumed during time t
OUT
D
+
−






V



I
...............................................................................
•
PK
•
IN
R
t
1
ESR
OUT
+
•
2
.........................................................................
∫
I
0
t
OUT
1
during time t
t
..................................................................
dt



•
R
ESR
−
I
OUT
C
1
1
:
OUT
and R
•
t
1
ESR
...................................
, which is the Electric Series
S-8335 Series
(12)
(13)
(14)
(15)
(16)
15