S-8335A160FT-TB-G Seiko Instruments, S-8335A160FT-TB-G Datasheet - Page 13

• 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

Rev.6.0
2. Step-up type switching regulators (DC/DC P and DC/DC U)
The fundamental equations {(1) to (7)} of the step-up type regulators are shown below (see Figure 4).
CONT pin voltage (V
zero):
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 (t
voltage (V
_01
I
I
V =
dI
dt
L
PK
A
L
STEP-UP, FOR LCD BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR
=
=
=



V
L



V
) is generated.
V
S
L
L
V
IN
L
with time:
L
IN
L
*: In DC/DC P, R1 is a variable resistance controlled by the electric volume.
−
(V
=
flows during time t
L
PK
MC1
MC2
−
V
V
V
S
) after t
V
S
IN
: Unsaturated voltage of M1)
IN
..........................................................................................................................
S



L



•
−
t
•
V
A
t
) immediately after M1 is turned on (I
ON
S
ON
:
control
Mode
......................................................................................................
......................................................................................................
......................................................................................................
Figure 4 DC/DC P and DC/DC U
OFF
OSC
ON
), the energy stored in L is emitted through a diode, and a counter
. This time (t
L
Seiko Instruments Inc.
L
):
A
M1
CONT
ON
) is determined according to the oscillation frequency
D
⋅
L(I
PK
)
2
L
, which is the current that flows to L, is
.
VOUT
R1
R2
∗
I
C
OUT
OUT
S-8335 Series
V
OUT
(1)
(2)
(3)
(4)
13