S-8335A120FT-TB-G Seiko Instruments, S-8335A120FT-TB-G Datasheet - Page 25

• 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
Selection of External Parts
1. Inductor
The inductance value significantly affects the maximum output current I
Figure 18 shows graphs of the dependency of I
value L.
As the L value decreases, the peak current I
value. If the L value decreases further, the current driving capability of the switching transistor becomes
insufficient, and I
Also, as the L value increases, the power loss due to I
efficiency reaches its maximum at a certain L value. If the L value increases further, the power loss due
to the series resistance of the coil increases, and efficiency is reduced.
The recommended inductance value is 100 to 150 µH for DC/DC P and 100 to 180 µH for DC/DC Q
and DC/DC U.
DC-DC P (V
DC-DC U (V
_01
I
OUT
I
OUT
STEP-UP, FOR LCD BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR
OUT
OUT
= 3.99 V, V
= 16.6 V, V
Figure 18 Dependency of I
100
100
I
OUT
OUT
Recommended
Recommended
BAT
I
is reduced.
OUT
range
= 3.0 V )
BAT
range
= 3.0 V)
150
EFFIU
150
EFFIP
180
L value (µH)
Seiko Instruments Inc.
L value ( µ H)
EFFIU
OUT
PK
EFFIP
and EFFI on Inductance Value L
increases, and I
OUT
and EFFI for the S-8335 Series on the inductance
PK
DC-DC Q (
at the switching transistor decreases, and the
I
OUT
OUT
V
OUT
reaches its maximum at a certain L
=16.6 V, V
100
OUT
I
OUT
Recommended
BAT
and efficiency η (EFFI).
range
=3.0 V )
S-8335 Series
EFFIQ
180
L value (µH)
EFFIQ
25