S-8335A160FT-TB-G Seiko Instruments, S-8335A160FT-TB-G Datasheet - Page 26

• Manufacturer Part Number: S-8335A160FT-TB-G
• Description: IC REG SW 3CH STEP UP 24-TSSOP
• Manufacturer: Seiko Instruments
• Type: Step-Up (Boost), Invertingr

Specifications of S-8335A160FT-TB-G

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 7.48 ~ 13.93 V, -5.44 ~ -10.13 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: 13.93 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

26
STEP-UP, FOR LCD BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR
S-8335 Series
2. Diode
3. Capacitors (CVBAT, CL)
When you select inductors, pay attention to the permissible current of the inductors. If a current that
exceeds the permissible current flows in the inductor, magnetic saturation will occur in the inductor.
This may cause a significant decrease in efficiency and may damage the IC due to excessive current.
Therefore, select inductors so that the peak current I
peak current I
where f
For example, assume that output voltage V
S-8335A240FT with the input voltage V
value, then I
least 61 mA at an L value of 150 µH should be selected.
An off-chip diode must satisfy the following conditions.
The input capacitor (CVBAT) can improve efficiency by decreasing the power supply impedance and
stabilizing the input current. Select the capacitor value according to the impedance of the power supply
used. Connect a capacitor of at least 1 µF to each of the two power supply pins.
For the output capacitor (CL), use a capacitor having a small Electric Series Resistance (ESR) and
large capacitance to stabilize the ripple voltage. Standard capacitor values are at least 2.2 µF for CL1
and CL2 and at least 10 µF for CL3. In particular, a tantalum electrolytic capacitor having excellent low
temperature characteristics and low leakage current characteristics should be used. A capacitor having
a large capacitance produces more stable output and leads to higher efficiency.
I
PK
• Low forward voltage:
• Fast switching speed:
• Reverse breakdown voltage: V
• Rated current:
=
I 2
OSC
OUT
is the oscillation frequency. V
•
PK
(
PK
V
f
= 61 mA from equation (33). Therefore, an inductor having a permissible current of at
OSC
OUT
in non-continuous mode is given by the following equation.
•
+
L
V
D
−
V
IN
)
V
500 ns max.
I
(
PK
A
F
OUT
)
< 0.3 V
or more
Seiko Instruments Inc.
+V
F
......................................................................................
IN
D
or more
is approximately 0.4 V.
OUT
= 3 V and f
= 16.6 V, with load current I
PK
OSC
does not exceed the permissible current. The
= 100 kHz. If 150 µH is selected for the L
OUT
= 2mA, using
Rev.6.0
(33)
_01