S-8335A160FT-TB-G Seiko Instruments, S-8335A160FT-TB-G Datasheet - Page 16

• 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

16
STEP-UP, FOR LCD BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR
S-8335 Series
3. Inverter type switching regulator (DC/DC Q)
The fundamental equations of the inverter type regulator are shown below.
Point A voltage immediately after M1 is turned on (I
Change in I
Result of integrating the above equation (I
The current I
of OSC.
Peak current (I
The energy stored in L at this time is represented by 1/2
Next, when M1 is turned off, the energy stored in L is emitted through ground
and a counter voltage (V
V
Change with time of current (I
Result of integrating the above equation:
L
:
I
I
I
V
V
dI
dI
dt
dt
L
PK
L
A
L
L
L
=
=
=
=
=
=
=
I



−
V
PK



V
V
V
(V
(
IN
L
L
L
V
IN
V
L
−
L
with time:
L
IN
D
OUT
−
L



−
=
(V
=
flows during time t
: Diode forward voltage)
L
PK
V
V
−
V
V
V
S
OUT
S
) after t
V
+
S
: Unsaturated voltage of M1)
OUT
IN
S



V
L
L



•
D
L
−
+
t
•
)
+
...................................
V
V
t
.................................
V
ON
S
D
ON
D
L



.............................
) is generated at the same time.
•
:
t
L
) that flows to −V
......................................................................................................
......................................................................................................
......................................................................................................
......................................................................................................
ON
. This time (t
Seiko Instruments Inc.
L
):
(17)
(18)
(19)
OUT
ON
) is determined according to the oscillation frequency
through a capacitor during time t
L
, which is the current that flows to L, is zero):
Figure 5 Inverter Type Switching Regulator
⋅
L(I
PK
)
V
2
.
IN
OSC
M1
A
→
L
Di
capacitor
OFF
:
I
C
OUT
OUT
Rev.6.0
→
−V
diode (Di),
OUT
(20)
(21)
(22)
(23)
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