S-8335A120FT-TB-G Seiko Instruments, S-8335A120FT-TB-G Datasheet - Page 20

• 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

20
STEP-UP, FOR LCD BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR
S-8335 Series
When mode 3 (standby mode) is canceled, the mode returns to the one that was in effect before switching to standby mode. For
example, if the IC entered mode 3 from mode 1, it will return to mode 1 when mode 3 is canceled.
Note 1:
Note 2:
Also, when MC1 (or MC2) = "L" and MC3 = "L", VRL and
GND are short-circuited via
If there is a potential difference between the applied voltage
to MC1 and MC2 and the power supply voltage of the S-
8335 Series, the current consumption in standby mode may
exceed 1 µA.
For example, when the applied voltage to MC1 and MC2 is
3.0 V and the power supply voltage of the S-8335 Series is
5.0 V, the current consumption in standby mode rises to
approximately 2.5 µA at 25°C (typ.) (see Figure 7). The
reason this occurs is that a penetrating current flows in
CMOS logic circuits because the potential of input signals
MC1 and MC2 (3.0 V) is lower than the internal logic power
supply voltage (5.0 V).
Therefore, use this IC in such a way that no potential
difference occurs between the applied voltage to MC1 and
MC2 and the power supply voltage of the S-8335 Series.
A penetrating current from V
is switched. When MC1 (or MC2) = "H" and MC3 = "H", a
current of approximately 6 mA flows from the VBAT pin
through the coil L1, diode D1, and transistor A because the
VOUT1 pin is short-circuited to GND level.
transistor G, and a current of approximately 150 mA flows.
To reduce the penetrating current, the MC1 (or MC2) and
MC3 signals should both be switched at the same time when
modes are switched. If this cannot be done, avoid a state in
which the MC1 (or MC2) and MC3 signals are both low ("L"
level) at the same time in order to reduce the penetrating
current (see Figure 8).
VBAT
Figure 6 Sample Circuit in Which 2SJ356 is Used
L1
BAT
to V
CONT1
SS
RESET
flows when the mode
VSS
Seiko Instruments Inc.
SBD
D1
Figure 7 Standby Mode Current Characteristics
MC1 (or MC2)
VOUT1
MC1
MC2
MC3
2.5
1.5
0.5
3
2
1
0
Normal mode
2.0
MC3
RA1:
470 kΩ
V
MC1
2.5
Figure 8 Mode Switching
2SJ356
= 3.0 V
3.0
E
RA2:
150 kΩ
A
Standby mode
(or icon mode)
V
BAT
3.5
[V]
CL1
4.0
Rev.6.0
Normal mode
4.5
_01
5.0