S-8335A160FT-TB-G Seiko Instruments, S-8335A160FT-TB-G Datasheet - Page 19

• 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
Operation Modes and Mode Control
The mode is switched among modes 1 to 3 according to the 2-bit input from the MC1 and MC2 pins and the
MC3 signal. The MC3 signal is not an input to a pin of this IC. It is a signal required for external part
control. This signal should be supplied from the LCD driver or LCD controller.
Since the MC1 and MC2 pins are not pulled up or pulled down internally, they should not be in a floating
state. Also, note that the current consumption in standby mode may exceed 1 µA if there is a potential
difference between the supply voltage of MC1 and MC2 and the supply voltage of the S-8335 Series IC.
1. Normal operation mode (MC1=L, MC2=L, MC3=H)
2. Icon mode (MC1=L, MC2=H, MC3=L)
3. Standby mode (MC1=H, MC3=L)
Remark: L: Low level, H: High level, X: Don't care
* MC3 is a signal that is the input to an external switch to forcibly discharge a capacitor in modes 2
Step-up operation is performed.
Only the reference voltage circuit and regulator S operate. The regulator S output V
arbitrarily in the range from 1.0 to 2.2 V by using external resistors RS1 and RS2. V
as the icon voltage. Use an RS1 value that matches the temperature characteristics of the panel by
combining a series or parallel resistor with a thermistor as necessary. See the section on regulator S
for information about the output voltage characteristics of regulator S when the output current is drawn.
The operation of internal circuits is shut down. The current consumption does not exceed 1 µA.
When the MC1 pin is set high ("H" level), the operation of all internal circuits stops, and the current
consumption is dramatically reduced.
VREGTO pins are each short-circuited to V
written to the register of the electric volume part is retained if a voltage of at least 2 V is applied
between the VBAT and VSS pins.) Since current flows at this time from the VOUT1 pin to V
coil and a diode at the input side, a switch for shutting down the current is required.
Figure 6 shows a sample circuit that uses NEC’s 2SJ356 (Pch MOSFET) as the current breaker switch.
In this sample circuit, the small signal transistor E (Nch MOSFET) is used to turn 2SJ356 on or off by
inputting the control signal MC3 to the gate of transistor E.
An invalid current flowing to resistor RA1 during a step-up operation may affect efficiency. Resistor
RA1 should be set to a high resistance value to reduce current. However, if the RA1 resistance value is
set too high, a voltage drop across resistor RA1 will occur due to the off-leak current of the small signal
transistor E, and the 2SJ356 current breaker switch may not turn off. Therefore, care must be taken.
Note:
breaker switch, differ from the efficiency of this sample circuit.
The efficiency characteristics shown in the reference data, which were measured without a current
_01
and 3.
STEP-UP, FOR LCD BIAS SUPPLY, 3-CHANNEL SWITCHING REGULATOR
MC1
H
L
L
MC2
H
X
L
Seiko Instruments Inc.
At the same time, the VOUT1, VXO, VYO, VREGSO, and
MC3*
SS
H
L
L
by on-chip Nch transistors. (However, data that was
Mode 1 (Normal operation)
Mode 2 (Icon mode)
Mode 3 (Standby mode)
Operation Mode
S-8335 Series
REGSO
REGSO
can be used
SS
can be set
through a
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