S-8333 Series
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STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL,
PWM CONTROL SWITCHING REGULATOR CONTROLLER
© ABLIC Inc., 2004-2015
Rev.4.2_02
The S-8333 Series is a CMOS step-up switching regulator which mainly consists of a reference voltage circuit, an oscillator,
an error amplifier, a PWM controller, an under voltage lockout circuit (UVLO), and a timer latch short-circuit protection
circuit. Because its minimum operating voltage is as low as 1.8 V, this switching regulator is ideal for the power supply of
an LCD or for portable systems that operate on a low voltage. The internal oscillation frequency can be set up to 1.08 MHz,
via the resistor connected to the ROSC pin.
The maximum duty ratio of PWM control can be controlled by the resistor connected to the RDuty pin. The soft-start
function at power application is accomplished by combining the reference voltage control and maximum duty control
methods. Even if the voltage of the FB pin is retained lower than the reference voltage due to the factor outside the IC, the
output voltage is raised by controlling the maximum duty. The phase compensation and gain value can be adjusted
according to the values of the resistor and capacitor connected to the CC pin. Therefore, the operation stability and
transient response can be correctly set for each application. The reference voltage accuracy is as high as 1.0 V 1.5%, and
any voltage can be output by using an external output voltage setting resistor.
In addition, the delay time of the short-circuit protection circuit can be set by using the capacitor connected to the CSP pin.
If the maximum duty condition continues because of short-circuiting, the capacitor externally connected to the CSP pin is
charged, and oscillation stops after a specific time. The short-circuit protection function is cancelled when the power supply
is raised to the UVLO release voltage after it has been lowered to the UVLO detection voltage. A ceramic capacitor or a
tantalum capacitor is used as the output capacitor, depending on the setting. This controller IC allows various settings and
selections and employs a small package, making it very easy to use.
Features
Low voltage operation:
Oscillation frequency:
Maximum duty:
1.8 V to 6.0 V
280 kHz to 1.08 MHz (selectable by external resistor)
Settable up to 88.5% by external resistor
47 to 88.5% (oscillation frequency; 500 kHz or more)
47 to 80% (oscillation frequency; less than 500 kHz)
Reference voltage:
1.0 V 1.5%
Range of operation temperature: 40 to 85C
UVLO (under-voltage lockout) function:
Detection voltage can be selected from between 1.5 V and 2.3 V in 0.1 V step.
Hysteresis width can be selected from between 0.1 V and 0.3 V in 0.1 V step.
Timer latch short-circuit protection circuit:
Delay time can be set using an external capacitor.
Soft-start function:
Soft-start time can be selected in three steps, 10 ms, 15 ms, and 20 ms.
Both reference voltage control and maximum duty control methods are applied
Phase compensation external setting:
Control is possible via the resistor connected between the CC and GND pins
and capacitor
Lead-free, Sn 100%, halogen-free*1
*1. Refer to “ Product Name Structure” for details.
Applications
Power supplies for LCDs and CCDs
Power supplies for portable equipment
Packages
SNT-8A
8-Pin TSSOP
1
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
Block Diagram
VOUT
SD
L
RDuty
VIN
UVLO
M1
CIN
ROSC
PWM
comparator
Timer latch
short-circuit
protection circuit
EXT
VSS
CSP
Error amplifier
Reference voltage
(1.0 V) soft-start
circuit
CC
RZ CZ
Figure 1 Block Diagram
2
CFB RFB1
Oscillator
Maximum duty
soft-start circuit
CL
FB
RFB2
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
Product Name Structure
1. Product name
(1) SNT-8A
S-8333
C
x
x
x
-
I8T1
U
Environmental code
U:
Lead-free (Sn 100%), halogen-free
Package abbreviation and packing specifications*1
I8T1: SNT-8A, tape product
Soft-start time setting
A:
10 ms
B:
15 ms
C:
20 ms
UVLO setting
A:
2.3 V
B:
2.2 V
C:
2.1 V
D:
2.0 V
E:
1.9 V
F:
1.8 V
G:
1.7 V
H:
1.6 V
I:
1.5 V
UVLO hysteresis setting
A:
0.1 V
B:
0.2 V
C:
0.3 V
*1. Refer to the tape drawing.
3
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Rev.4.2_02
S-8333 Series
(2) 8-Pin TSSOP
S-8333
C
x
x
x
-
T8T1
x
Environmental code
U:
Lead-free (Sn 100%), halogen-free
S:
Lead-free, halogen-free
Package abbreviation and packing specifications*1
T8T1: 8-Pin TSSOP, tape product
Soft-start time setting
A:
10 ms
B:
15 ms
C:
20 ms
UVLO setting
A:
2.3 V
B:
2.2 V
C:
2.1 V
D:
2.0 V
E:
1.9 V
F:
1.8 V
G:
1.7 V
H:
1.6 V
I:
1.5 V
UVLO hysteresis setting
A:
0.1 V
B:
0.2 V
C:
0.3 V
*1. Refer to the tape drawing.
2. Packages
Package Name
SNT-8A
8-Pin TSSOP
4
Package
PH008-A-P-SD
FT008-A-P-SD
Drawing Code
Tape
Reel
PH008-A-C-SD PH008-A-R-SD
FT008-E-C-SD FT008-E-R-SD
Land
PH008-A-L-SD
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
Pin Configurations
1. SNT-8A
Table 1
Top view
1
2
3
4
Pin No.
8
7
6
5
Figure 2
Symbol
Description
1
CC
Error amplifier circuit output phase
compensation pin
2
FB
Output voltage feedback pin
3
CSP
Short-circuit protection delay time setting pin
4
VIN
Power supply input pin
5
EXT
External transistor connection pin
6
VSS
GND pin
7
ROSC
Oscillation frequency setting resistor
connection pin
8
RDuty
Maximum duty setting resistor connection pin
2. 8-Pin TSSOP
Table 2
Pin No.
Top view
1
2
3
4
8
7
6
5
Figure 3
Symbol
Description
1
CC
Error amplifier circuit output phase
compensation pin
2
FB
Output voltage feedback pin
3
CSP
Short-circuit protection delay time setting pin
4
VIN
Power supply input pin
5
EXT
External transistor connection pin
6
VSS
GND pin
7
ROSC
Oscillation frequency setting resistor
connection pin
8
RDuty
Maximum duty setting resistor connection pin
5
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
Absolute Maximum Ratings
Table 3 Absolute Maximum Ratings
(Unless otherwise specified: Ta 25C, VSS 0 V)
Parameter
VIN pin voltage
FB pin voltage
EXT pin voltage
CSP pin voltage
CC pin voltage
CC pin current
ROSC pin voltage
ROSC pin current
RDuty pin voltage
RDuty pin current
SNT-8A
Power dissipation
8-Pin TSSOP
Symbol
VIN
VFB
VEXT
VCSP
VCC
ICC
VROSC
IROSC
VRDuty
IRDuty
PD
Operating ambient temperature
Storage temperature
Topr
Tstg
Ratings
VSS 0.3 to VSS 6.5
VSS 0.3 to VSS 6.5
VSS 0.3 to VIN 0.3
VSS 0.3 to VIN 0.3
VSS 0.3 to VIN 0.3
10
VSS 0.3 to VIN 0.3
10
VSS 0.3 to VIN 0.3
10
*1
450
300 (When not mounted on board)
*1
700
40 to 85
40 to 125
Unit
V
V
V
V
V
mA
V
mA
V
mA
mW
mW
mW
C
C
*1. When mounted on board
[Mounted board]
(1) Board size:
(2) Name:
Caution
114.3 mm 76.2 mm t1.6 mm
JEDEC STANDARD51-7
The absolute maximum ratings are rated values exceeding which the product could suffer
physical damage. These values must therefore not be exceeded under any conditions.
Power dissipation (PD) [mW]
800
600
8-Pin TSSOP
SNT-8A
400
200
0
0
50
100
150
Ambient temperature (Ta) [C]
Figure 4 Power Dissipation of Package (When mounted on board)
6
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
Electrical Characteristics
Table 4 Electrical Characteristics
(Unless otherwise specified: VIN 3.3 V, Ta 25C)
Parameter
Symbol
Operating input voltage VIN
FB voltage
VFB
Current consumption
ISS1
IEXTH
IEXTL
FB voltage temperature VFB
coefficient
Ta
FB pin input current
IFB
EXT pin output current
Oscillation frequency*1
fosc
Oscillation frequency
fosc
temperature coefficient Ta
Max. duty*2
MaxDuty
Soft-start time
tSS
Short-circuit protection
tPRO
*3
delay time
UVLO detection voltage VUVLO
UVLO hysteresis width VUVLOHYS
CC pin output current
ICCH
ICCL
VRTLT1
Timer latch reset voltage
VRTLT2
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
1.8
0.985
1.000
6.0
1.015
V
V
2
2
fosc 650 kHz
VFB 0.95 V
VEXT VIN 0.4 V
VEXT 0.4 V
450
700
A
1
100
100
160
60
mA
mA
1
1
Ta 40 to 85C
100
ppm/C
2
0.1
0.1
A
1
fosc
0.9
fosc
fosc
1.1
kHz
1
1000
ppm/C
1
%
1
When fosc 1080 kHz is set
(ROSC 120 k)
When fosc 650 kHz is set
(ROSC 200 k)
When fosc 280 kHz is set
(ROSC 470 k)
VFB 0.9 V
Waveform on EXT pin is measured.
Ta 40 to 85C
fosc 650 kHz
fosc 1080 kHz (ROSC 120 k)
MaxDuty 88.5% (RDuty 62 k)
MaxDuty 73% (RDuty 180 k)
MaxDuty 47% (RDuty 390 k)
fosc 650 kHz (ROSC 200 k)
MaxDuty 88.5% (RDuty 100 k)
tSS 10 ms, 15 ms, 20 ms
Selected in three steps
tPRO 50 ms
(CSP 0.1 F)
VUVLO 1.5 V to 2.3 V
Selected in 0.1 V steps
VUVLOHYS 0.1 V to 0.3 V
Selected in 0.1 V steps
VFB 2 V
VFB 0 V
Within short-circuit protection delay
time
After short-circuit protection circuit
operated
MaxDuty
MaxDuty
MaxDuty
5
5
tSS
0.75
tSS
tSS
1.5
ms
1
37.5
50
75
ms
1
V
1
V
1
A
A
1
1
VUVLO
VUVLO
VUVLO
0.95
1.05
VUVLOHYS
VUVLOHYS
VUVLOHYS
0.6
1.4
60
45
34.5
34.5
45
60
0.7
1.0
1.3
V
1
VUVLO
0.95
VUVLO
VUVLO
1.05
V
1
*1. The recommended range of the resistance (Rosc) for oscillation frequency is Rosc 120 k to 470 k (fOSC 280 kHz to 1.08 MHz).
This range of oscillation frequency is the typical value when an ideal resistor is connected externally. In actual use, it is necessary to
take account the dispersion of an IC (10%) into this value.
*2. Set max. duty; Between 47 and 88.5 % (RDuty/ROSC = 0.5 to 3.2); the oscillation frequency is 500 kHz or more
Between 47 and 80 % (RDuty/ROSC = 1.0 to 3.2); the oscillation frequency is less than 500 kHz
This range of max. duty is the typical value when an ideal resistor is connected externally. In actual use, it is necessary to take
account the dispersion of an IC (5%) into this value.
*3. The short-circuit protection time can be set by the external capacitor. Although the maximum set value by the external capacitor is
unlimited under the ideal condition, set CSP approx. 0.47 F as a target maximum value due to discharge time of the capacitor.
7
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
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S-8333 Series
External Parts When Measuring Electrical Characteristics
Table 5 External Parts
Element Name
Inductor
Diode
Output capacitor
Transistor
Oscillation frequency setting resistor
Maximum duty ratio setting resistor
Short-circuit protection delay time
setting capacitor
Output voltage setting resistor 1
Output voltage setting resistor 2
FB pin capacitor
Phase compensation resistor
Phase compensation capacitor
8
Symbol
L
SD
CL
M1
ROSC
RDuty
Manufacturer
TDK Corporation
Rohm Co., Ltd.
Sanyo Electric Co., Ltd.
Part Number
LDR655312T 10 H
RB491D
Ceramic 10 F
MCH3406
200 k (when fOSC 650 kHz)
300 k (when MaxDuty 73%)
CSP
0.1 F (when tPRO 50 ms)
RFB1
RFB2
CFB
RZ
CZ
8.2 k (when VOUT 9.2 V)
1.0 k (when VOUT 9.2 V)
180 pF
200 k
0.01 F
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
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S-8333 Series
Measurement Circuits
1.
RZ
A
CZ
CSP
CC
RDuty
FB
ROSC
CSP
VSS
VIN
EXT
ROSC RDuty
CIN
Oscilloscope
Figure 5
2.
RFB1
RDuty
FB
ROSC
CFB
RZ
CZ
CC
SD
RFB2
CL
L
M1 CIN
CSP
VSS
VIN
EXT
ROSC RDuty
CSP
V
Figure 6
9
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
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S-8333 Series
Operation
1. Switching control method
1. 1 PWM control
The S-8333 Series is a DC-DC converter using a pulse width modulation method (PWM).
The pulse width of the S-8333 Series varies from 0% to the maximum duty set by RDuty depending on the load
current, but its switching frequency does not change. Consequently, the ripple voltage generated from switching
can be removed easily via a filter.
2. Soft-start function
For this IC, the built-in soft-start circuit controls the rush current and overshoot of the output voltage when
powering on. Reference voltage adjustment and maximum duty control methods are adopted as the soft-start
methods. The following describes the soft-start function at power application.
In the circuit where the input voltage is not directly output at shutdown by inserting a switch (SW) between the
diode (SD) and VOUT output, the VOUT voltage when the VIN voltage is applied with the SW OFF stays 0 V.
Therefore, the voltage of the FB pin stays 0 V and the EXT output is in the step up status between the “H” and “L”
levels due to the maximum duty. The maximum duty at this time is approximately 7% and the rush current at
power application is controlled. The maximum duty soft start is accomplished by gradually increasing the duty
width up to the maximum duty set by the external resistor RDuty (refer to Figure 8).
The reference voltage of the error amplifier input also gradually increases from 0 V at the same time as the
maximum duty soft start. The increasing of the output voltage is controlled by turning the SW ON. The soft-start
function is realized by controlling the voltage of the FB pin so that it is the same potential as the reference voltage
that is slowly raised. A Rail-to-Rail amplifier is adopted as the error amplifier, which means that the voltage is
loop controlled so that it can be the same as the reference voltage.
Once the reference voltage rises, the voltage cannot be reset (the reference voltage is 0 V) unless making the
power supply voltage lower than the UVLO detection voltage. Conversely, when the power supply voltage rises
up to the reset voltage after it is lowered to the UVLO detection voltage or lower, the output voltage is stepped up
by the soft-start function.
SD
SW
VOUT
L
PWM
Comparator
VIN
M1
EXT
CC
FB
Error amplifier
Error amplifier
reference voltage
RZ
Vref
CZ
Figure 7
10
RFB1
0.5 V
0V
CL
RFB2
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
(VIN 0 V→3.3 V, VOUT 9.2 V, RFB1 8.2 k, RFB2 1.0 k)
3.3 V
Input voltage
(VIN)
0V
tSS
9.2 V
Output voltage
(VOUT )
V OUT 0.95
SW : ON
0V
1.0 V
Error amplifier
reference voltage
0V
Reference voltage soft-start period
1.0 V
F B pin voltage
(VFB )
0V
3.3 V
EXT pin voltage
(VEXT)
0V
Maximum duty
soft-start period
t (ms)
Figure 8
11
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S-8333 Series
3. Timer latch short-circuit protection function
This IC has a timer latch short-circuit protection circuit that stops the switching operation when the output voltage
drops for a specific time due to output short-circuiting. A capacitor (CSP) that is used to set the delay time of this
short-circuit protection circuit can be connected to the CSP pin.
This IC operates at the maximum duty ratio if the output voltage drops due to output short-circuiting. At the
maximum duty ratio, constant-current charging of CSP starts. If this status lasts for a short-circuit protection
delay time and the CSP pin voltage rises above the reference voltage, the latch mode is set. Note that the latch
mode is different from the shutdown status in that the switching operation is stopped but the internal circuitry
operates normally.
To reset the latch operation to protect the IC from short-circuiting, lower VIN than the UVLO detection voltage.
The latch mode within the short-circuit protection delay time is reset by decreasing VIN to 1.0 V (Typ.) or lower.
Note that the mode is not reset even if the VIN is lowered to the UVLO detection voltage (refer to Figure 9).
Input voltage
(VIN)
UVLO release
UVLO detection
1.0 V
Output load
CSP pin voltage
(VCSP)
Short-circuit status
Reference
voltage
50 ms (CSP 0.1 F)
Latch mode
Normal
status
Short-circuit
protection time
Latch
period
Short-circuit
protection time
Reset period
Short-circuit
protection time
Reset period
Figure 9
4. UVLO function
This IC includes a UVLO (under-voltage lockout) circuit to prevent the IC from malfunctioning due to a transient
status when power is applied or a momentary drop of the power supply voltage. When UVLO is in the detection
state, switching is stopped and the external FET is held in the off status. Once UVLO enters the detection state,
the soft-start function is reset.
Note that the other internal circuits operate normally and that the status is different from the power-off status.
12
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S-8333 Series
5. Error amplifier
The error amplifier outputs the PWM control signal so that the voltage of the FB pin is held at a specific value
(1 V). By connecting a resistor (RZ) and capacitor (CZ) to the output pin (CC pin) of the error amplifier in series,
an optional loop gain can be set, enabling stabilized phase compensation.
6. Operation
The following are basic equations [(1) through (7)] of the step-up switching regulator (refer to Figure 10).
L
CONT
VIN
M1
D
VOUT
EXT
FB
CL
VSS
Figure 10 Step-up Switching Regulator Circuit for Basic Equations
Voltage at the CONT pin at the moment M1 is turned ON (current IL flowing through L is zero), VA:
*1
VA VS ................................................................................................................................................. (1)
*1.
VS: Non-saturated voltage of M1
Change in IL over time:
V VS
dl L
V
............................................................................................................................. (2)
L IN
dt
L
L
Integration of the above equation:
V VS
IL IN
t .................................................................................................................................. (3)
L
IL flows while M1 is ON (ton). This time is determined by the oscillation frequency of OSC.
Peak current (IPK) after tON:
V VS
IPK IN
t ON ........................................................................................................................... (4)
L
1
2
The energy stored in L is represented by 2 L (IPK) .
When M1 is turned OFF (tOFF), the energy stored in L is released via a diode, generating a reverse voltage (VL).
VL:
VL VOUT VD
*2.
*2
V
IN
......................................................................................................................... (5)
VD: Diode forward voltage
The voltage on the CONT pin rises only by VOUT VD.
13
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S-8333 Series
Change in current (IL) flowing through the diode into VOUT during tOFF:
VD VIN
V
dI L
V
................................................................................................................. (6)
L OUT
dt
L
L
Integration of the above equation is as follows:
VD VIN
V
IL IPK OUT
t .................................................................................................................. (7)
L
During tON, energy is stored in L and is not transmitted to VOUT. When receiving output current (IOUT) from VOUT,
the energy of the capacitor (CL) is used. As a result, the pin voltage of CL is reduced, and goes to the lowest level
after M1 is turned ON (tON). When M1 is turned OFF, the energy stored in L is transmitted via the diode to CL, and
the pin voltage of CL rises drastically. Because VOUT is a time function indicating the maximum value (ripple
voltage: Vp-p) when the current flowing through the diode into VOUT and the load current IOUT match.
Next, this ripple voltage is determined as follows.
IOUT vs t1 (time) from after tON, when VOUT reaches the maximum level:
VD VIN
V
IOUT IPK OUT
L
t 1 ............................................................................................................. (8)
........................................................................................................... (9)
L
VOUT VD VIN
t1 IPK IOUT
When tOFF, IL = 0 (when the energy of the inductor is completely transmitted):
Based on equation (7),
L
V
V D V IN
OUT
t
OFF ............................................................................................................ (10)
I PK
When substituting equation (10) for equation (9):
IOUT
tOFF ............................................................................................................................ (11)
IPK
t1 tOFF
Electrical charge Q1 which is charged in CL during t1:
Q1
t1
t1
I dt I dt
0
L
PK
0
V OUT V D VIN
L
t1
tdt I
0
PK
t1
V OUT VD VIN 1 2
t 1 ...................... (12)
L
2
When substituting equation (12) for equation (9):
∆ Q 1 IPK
1
IPK IOUT
2
t1
IPK IOUT
t 1 ........................................................................... (13)
2
A rise voltage (Vp-p) due to Q1:
VP - P
∆Q1 1 IPK IOUT
t1 ............................................................................................................ (14)
CL
CL
2
When taking into consideration IOUT consumed during t1 and ESR*1 (RESR) of CL:
VP P
*1.
∆Q1
1 IPK IOUT
I
t1
I IOUT
............................................... (15)
t 1 PK
R ESR OUT
CL
CL
2
2
C
L
Equivalent Series Resistance
When substituting equation (11) for equation (15):
VP P
(I PK IOUT ) 2 t OFF
I IOUT
PK
R ESR ............................................................................... (16)
2 IPK
CL
2
Therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin has a large
capacity and a small ESR.
14
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S-8333 Series
External Parts Selection
1. Inductor
The inductance has a strong influence on the maximum output current (IOUT) and efficiency ().
The peak current (IPK) increases by decreasing L and the stability of the circuit improves and IOUT increases. If L
is decreased further, the efficiency falls, and IOUT decreases if the current drive capability of the external
transistor is insufficient.
The loss of IPK by the switching transistor decreases by increasing L and the efficiency becomes maximum at a
certain L value. Further increasing L decrease the efficiency due to the loss of the DC resistance of the inductor.
IOUT also decreases.
If the oscillation frequency is higher, a smaller L value can be chosen, making the inductor smaller. In the S-8333
Series, the oscillation frequency can be varied within the range of 280 kHz to 1.08 MHz by the external resistor,
so select an L value best suited to the frequency. The recommended value is between 2.2 H and 22 H.
When selecting an inductor, note the allowable current of the inductor. If a current exceeding this allowable
current flows through the inductor, magnetic saturation occurs, substantially lowering the efficiency and
increasing the current, which results in damage to the IC.
Therefore, select an inductor so that IPK does not exceed the allowable current. IPK is expressed by the following
equations in the discontinuous mode and continuous mode.
2 IOUT(VOUT VD VIN)
fosc L
IPK
IPK
(VOUT VD VIN) VIN
VOUT VD
IOUT
VIN
2 (VOUT VD) fosc L
( discontinuous mode ) ................................................. (17)
(continuous mode) ....................................................... (18)
fOSC Oscillation frequency, VD 0.4 V.
2. Diode
Use an external diode that meets the following requirements.
Low forward voltage
High switching speed
Reverse breakdown voltage: VOUT [Spike voltage] or more
Rated current: IPK or more
3. Capacitors (CIN, CL)
The capacitor on the input side (CIN) can lower the supply impedance and level the input current for better
efficiency. Select CIN according to the impedance of the power supply to be used.
The capacitor on the output side (CL) is used to smooth the output voltage. Select an appropriate capacitance
value based on the I/O conditions and load conditions. A capacitance of 10 F or more is recommended.
By adjusting the phase compensation of the feedback loop using the external resistor (RZ) and capacitor (CZ), a
ceramic capacitor can be used as the capacitor on the output side. If a capacitor whose equivalent series
resistance is between 30 m and 500 m is used as the output capacitor, the adjustable range of the phase
compensation is wider; however, note that other characteristics may be affected by ripple voltage or other
conditions at this time. The optimal capacitor differs depending on the L value, capacitance value, wiring, and
application (output load), so select the capacitor after performing sufficient evaluation under the actual usage
conditions.
15
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
4. External transistor
A bipolar (NPN) or enhancement (N-channel) MOS FET transistor can be used as the external transistor.
4. 1 Bipolar (NPN) type
The driving capability when the output current is increased by using a bipolar transistor is determined by hFE
and Rb of the bipolar transistor. Figure 11 shows a peripheral circuit.
VIN
Cb
2200 pF
Pch
IPK
Rb
EXT
1 k
Nch
Figure 11 External Transistor Periphery
1 k is recommended for Rb. Actually, calculate the necessary base current (Ib) from hFE of the bipolar
transistor as follows and select an Rb value lower than this.
Ib
IPK
hFE
Rb
VIN 0.7
Ib
0.4
IEXTH
A small Rb increases the output current, but the efficiency decreases. Actually, a pulsating current flows and
a voltage drop occurs due to the wiring capacitance. Determine the optimum value by experiment.
A speed-up capacitor (Cb) connected in parallel with Rb resistance as shown in Figure 11 decreases the
switching loss and improves the efficiency.
Select Cb by observing the following equation.
Cb
1
2 Rb fosc 0.7
However, in practice, the optimum Cb value also varies depending on the characteristics of the bipolar
transistor employed. Therefore, determine the optimum value of Cb by experiment.
4. 2 Enhancement MOS FET type
Use an Nch power MOS FET. For high efficiency, using a MOS FET with a low ON resistance (RON) and
small input capacitance (CISS) is ideal, however, ON resistance and input capacitance generally share a
trade-off relationship. The ON resistance is efficient in a range in which the output current is relatively great
during low-frequency switching, and the input capacitance is efficient in a range in which the output current
is middling during high-frequency switching.
Select a MOS FET whose ON resistance and input
capacitance are optimal depending on the usage conditions.
The input voltage (VIN) is supplied for the gate voltage of the MOS FET, so select a MOS FET with a gate
withstanding voltage that is equal to the maximum usage value of the input voltage or higher and a drain
withstanding voltage that is equal to the amount of the output voltage (VOUT) and diode voltage (VD) or
higher.
If a MOS FET with a threshold that is near the UVLO detection voltage is used, a large current may flow,
stopping the output voltage from rising and possibly generating heat in the worst case. Select a MOS FET
with a threshold that is sufficiently lower than the UVLO detection voltage value.
16
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
5. Oscillation frequency and maximum duty ratio setting resistors (ROSC, RDuty)
With the S-8333 Series, the oscillation frequency can be set in a range of 280 kHz to 1.08 MHz using external
resistance. Connect a resistor across the ROSC and VSS pins. Select the resistor by using the following
equation and referring to Figure 12. However, the following equation and figure assume that the resistance
value is the desired value and show the theoretical values when the IC is in the typical conditions. Note that
fluctuations of resistance and IC are not considered.
130 103
fOSC [kHz]
1400
1200
fOSC [kHz]
ROSC [k]
1000
800
600
400
200
0
0
600
400
200
ROSC [k]
Figure 12 ROSC vs. fOSC
With the S-8333 Series, the maximum duty ratio can be set in a range of 47% to 88.5% (between 47 to 80%, if the
oscillation frequency is less than 500 kHz) by an external resistor. Connect the resistor across the RDuty and
VSS pins. Select the resistance by using the following equation and referring to Figure 13. The maximum duty
ratio fluctuates according to the oscillation frequency. If the value of ROSC is changed, therefore, be sure to
change the value of RDuty so that it is always in proportion to RDuty / ROSC. However, the following equation
and figure assume that the resistance value is the desired value and show the theoretical values when the IC is
in the typical conditions. Note that fluctuations of resistance and IC are not considered.
Caution Set max. duty 80% or less if the oscillation frequency is less than 500 kHz.
RDuty
(95.5 MaxDuty)
100
15.0
90
MaxDuty [%]
ROSC
80
70
60
50
40
0
1
2
3
4
RDuty / ROSC
Figure 13 RDuty / ROSC vs. MaxDuty
Connect resistors ROSC and RDuty as close to the IC as possible.
17
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
6. Short-circuit protection delay time setting capacitor (CSP)
With the S-8333 Series, the short-circuit protection delay time can be set to any value by an external capacitor.
Connect the capacitor across the CSP and VSS pins. Select the capacitance by using the following equation and
referring to Figure 14. However, the following equation and figure assume that the capacitor value is the desired
value and show the theoretical values when the IC is in the typical conditions. Note that fluctuations of capacitor
and IC are not considered.
tPRO [ms] 2 103
120
1.0
100
tPRO [ms]
CSP [F]
80
60
40
20
0
0
0.05
0.10
0.15
0.20
0.25
CSP [F]
Figure 14 CSP vs. tPRO
7. Output voltage setting resistors (RFB1, RBF2)
With the S-8333 Series, the output voltage can be set to any value by external divider resistors.
Connect the divider resistors across the VOUT and VSS pins. Because VFB 1 V, the output voltage can be
calculated by this equation.
(RFB1 RFB2)
VOUT
RFB2
Connect divider resistors RFB1 and RFB2 as close to the IC to minimize effects from of noise. If noise does have
an effect, adjust the values of RFB1 and RFB2 so that RFB1 RFB2 < 100 k.
CFB connected in parallel with RFB1 is a capacitor for phase compensation. Select the optimum value of this
capacitor at which the stable operation can be ensured from the values of the inductor and output capacitor.
8. Phase compensation setting resistor and capacitor (RZ, CZ)
The S-8333 Series needs appropriate compensation for the voltage feedback loop to prevent excessive output
ripple and unstable operation from deteriorating the efficiency. This compensation is implemented by connecting
RZ and CZ in series across the CC and VSS pins. RZ sets the high-frequency gain for a high-speed transient
response. CZ sets the pole and zero of the error amplifier and keeps the loop stable. Adjust RZ and CZ, taking
into consideration conditions such as the inductor, output capacitor, and load current, so that the optimum
transient characteristics can be obtained.
18
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
Standard Circuit
SD
L
VOUT
RDuty
VIN
UVLO
M1
CIN
ROSC
PWM
comparator
EXT
Timer latch
short-circuit
protection circuit
0.1 F
VSS
CSP
CFB RFB1
Oscillator
Maximum duty
soft-start circuit
Error amplifier
Reference voltage
(1.0 V)
soft-start circuit
CL
ROSC RDuty
FB
RFB2
CC
RZ
CZ
Ground point
Figure 15 Standard Circuit
Caution
The above connection diagram and constant will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constant.
19
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
Precaution
Mount external capacitors, diodes, and inductor as close as possible to the IC.
Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover rush current
flows at the time of a power supply injection. Because these largely depend on the inductor, the capacitor and
impedance of power supply used, fully check them using an actually mounted model.
Make sure the dissipation of the switching transistor (especially at a high temperature) does not exceed the
allowable power dissipation of the package.
The performance of a switching regulator varies depending on the design of the PCB patterns, peripheral circuits,
and external parts. Thoroughly test all settings with your device.
The capacitor, diode, inductor and others used as external parts do not assure the operation at high temperature.
Evaluate fully using the actual application when designing.
This IC builds in soft start function, starts reference voltage gradually, and it is controlled so that FB pin voltage and
reference voltage become this potential. Therefore, keep in mind that it will be in a maximum duty state according
to the factor of IC exterior if FB pin voltage is held less than reference voltage.
Although the IC contains a static electricity protection circuit, static electricity or voltage that exceeds the limit of the
protection circuit should not be applied.
ABLIC Inc. assumes no responsibility for the way in which this IC is used on products created using this IC or for the
specifications of that product, nor does ABLIC Inc. assume any responsibility for any infringement of patents or
copyrights by products that include this IC either in Japan or in other countries.
20
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
Characteristics (Typical Data)
1. Example of Major Temperature Characteristics (Ta 40 to 85C)
W
W
W
- -
°
IEXTL vs. Ta (VIN 3.3 V)
-
-
-
-
-
-
-
-
!"#
-
$% W, % " W&
-
- -
°
IEXTH vs. Ta (VIN 3.3 V)
W
W
W
- -
°
20 40
Ta [C]
60
80
100
MaxDuty vs. Ta (VIN 3.3 V)
100
90
MaxDuty = 88.5% (ROSC = 200 kRDuty = 100 k)
80
70
MaxDuty = 73% (ROSC = 200 kRDuty = 300 k)
60
50
40
MaxDuty = 47% (ROSC = 200 kRDuty = 640 k)
30
20
10
0
40 20
0
20 40 60 80 100
Ta [C]
MaxDuty [%]
! "#$
%& W, & ! # W'
- -
°
fOSC vs. Ta (VIN 3.3 V)
IFB [A]
IFB vs. Ta (VIN 3.3 V)
0.10
0.08
0.06
0.04
0.02
0
0.02
0.04
0.06
0.08
0.10
40 20
0
tSS vs. Ta (VIN 3.3 V)
25.0
tSS = 20 ms
20.0
tSS [ms]
m
ISS1 vs. Ta (VIN 3.3 V)
15.0
tSS = 10 ms
10.0
5.0
0
40 20
0
20 40
Ta [C]
60
80
100
21
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
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S-8333 Series
VUVLO vs. Ta
2.5
VUVLOHYS vs. Ta
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
40 20
ICCH vs. Ta (VIN 3.3 V)
VUVLO = 1.5 V
1.0
0
40 20
-
-
-
-
-
-
-
-
-
-
- -
0
100
20 40
Ta [C]
60
80
°
60
80
m
VUVLOHYS [V]
VUVLOHYS = 0.1 V
0
20 40
Ta [C]
60
80
100
VRTLT1 vs. Ta (VIN 3.3 V)
1.2
1.0
VRTLT1 [V]
m
22
VUVLO = 2.3 V
1.5
0.5
VUVLOHYS = 0.3 V
ICCL vs. Ta (VIN 3.3 V)
- -
2.0
VUVLO [V]
tPRO [ms]
tPRO vs. Ta (VIN 3.3 V)
70.0
tPRO = 50 ms (CSP = 0.1 F)
60.0
50.0
40.0
30.0
20.0
10.0
0
40 20
0
20 40 60 80 100
Ta [C]
0.8
0.6
0.4
0.2
°
0
40 20
0
20 40
Ta [C]
100
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
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2. Example of Major Power Supply Dependence Characteristics (Ta 25C)
ISS1 vs. VIN
m
W
W
W
-
-
-
-
-
-
-
-
-
-
IEXTL vs. VIN
!"#$ %
&' W, '!"#$ W(
!"#$% &
'( W, ("#$% W)
fOSC vs. VIN
9
2
3
4
VIN [V]
5
6
9
9
7
tSS vs. VIN
25.0
20.0
MaxDuty = 88.5% (ROSC = 200 kRDuty = 100 k)
tSS [ms]
1
MaxDuty vs. VIN
100
90
80
70
60
50
40
30
20
10
0
1
0
MaxDuty [%]
IFB [A]
IFB vs. VIN
0.10
0.08
0.06
0.04
0.02
0
0.02
0.04
0.06
0.08
0.10
0
IEXTH vs. VIN
MaxDuty = 73% (ROSC = 200 kRDuty = 300 k)
MaxDuty = 47% (ROSC = 200 kRDuty = 640 k)
tSS = 20 ms
15.0
10.0
tSS = 10 ms
5.0
0
2
3
4
VIN [V]
5
6
7
0
1
2
3
4
VIN [V]
5
6
7
23
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
ICCH vs. VIN
-
-
-
-
-
-
-
-
-
-
tPRO=50 ms (CSP = 0.1 F)
m
tPRO [ms]
tPRO vs. VIN
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0
0
1
2
3
4
VIN [V]
5
6
7
m
ICCL vs. VIN
24
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
3. Example of External Parts Dependence Characteristics
fOSC vs. ROSC (VIN 3.3 V)
- °
°
°
W
MaxDuty [%]
MaxDuty vs. RDuty / ROSC (ROSC 200 k, VIN 3.3 V)
100
90
Ta = 40C
80
Ta = 25C
70
Ta = 85C
60
50
40
30
20
10
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
RDuty / ROSC
tPRO [ms]
tPRO vs. CSP (VIN 3.3 V)
350
300
250
200
150
100
50
0
0.1
0
0.2
0.3
CSP [F]
Ta = 40C
Ta = 25C
Ta = 85C
0.4
0.5
25
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
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4. Examples of Transient Response Characteristics
4.1 Powering ON (VOUT 9.2 V, VIN 0 V → 3.3 V, Ta 25C)
Remark The switch (SW) is inserted between the diode (SD) and VOUT output.
Controlled externally to turn SW on a few ms later after the VIN voltage is applied.
(1) fOSC 1080 kHz, IOUT 0 mA, tSS 10 ms
(2) fOSC 1080 kHz, IOUT 100 mA, tSS 10 ms
4
0
2
0
5
10
time [ms]
15
4
2
0
5
20
(3) fOSC 650 kHz, IOUT 0 mA, tSS 10 ms
0
0
5
10
time [ms]
15
20
(4) fOSC 650 kHz, IOUT 100 mA, tSS 10 ms
12
8
4
0
2
0
5
0
5
10
time [ms]
15
8
4
VIN [V]
VIN [V]
4
VOUT [V]
12
4
(5) fOSC 280 kHz, IOUT 0 mA, tSS 10 ms
0
2
0
5
20
0
5
10
time [ms]
15
20
(6) fOSC 280 kHz, IOUT 100 mA, tSS 10 ms
12
VIN [V]
4
4
26
0
2
0
0
5
10
time [ms]
15
20
8
4
VIN [V]
8
VOUT [V]
12
5
VOUT [V]
0
4
4
0
2
0
5
0
5
10
time [ms]
15
20
VOUT [V]
5
8
VIN [V]
VIN [V]
4
VOUT [V]
8
VOUT [V]
12
12
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Rev.4.2_02
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4.2 Load fluctuations (VOUT 9.2 V, VIN 3.3 V, Ta 25C, RZ 200 k, CZ 0.01 F)
(1) fOSC 1080 kHz, IOUT 0.1 mA100 mA
IOUT
100 mA
(2) fOSC 1080 kHz, IOUT 100 mA0.1 mA
10.0
0.1 mA
9.8
IOUT
100 mA
9.6
0.1 mA
10.0
9.8
9.6
9.4
9.2
VOUT
[0.2 V/div]
20
9.0
10
0
time [ms]
10
20
(3) fOSC 650 kHz, IOUT 0.1 mA100 mA
IOUT
100 mA
8.8
9.4
9.2
VOUT
[0.2 V/div]
20
9.0
10
0
time [ms]
10
20
(4) fOSC 650 kHz, IOUT 100 mA0.1 mA
10.0
0.1 mA
9.8
IOUT
100 mA
9.6
0.1 mA
10.0
9.8
9.6
9.4
9.2
VOUT
[0.2 V/div]
20
9.0
10
0
time [ms]
10
20
(5) fOSC 280 kHz, IOUT 0.1 mA100 mA
IOUT
100 mA
8.8
9.4
9.2
VOUT
[0.2 V/div]
20
9.0
10
0
time [ms]
10
20
9.8
IOUT
100 mA
9.6
0.1 mA
10.0
9.8
9.6
9.4
9.2
VOUT
[0.2 V/div]
9.0
10
0
time [ms]
10
8.8
(6) fOSC 280 kHz, IOUT 100 mA0.1 mA
10.0
0.1 mA
20
8.8
20
8.8
9.4
9.2
VOUT
[0.2 V/div]
20
9.0
10
0
time [ms]
10
20
8.8
27
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
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4.3 Input voltage fluctuations (VOUT 9.2 V, IOUT 100 mA, RZ 200 k, CZ 0.01 F)
(1) fOSC 1080 kHz, VIN 2.8 V3.8 V
4.0
VIN 3.5
[V] 3.0
2.5
20
10
0
time [ms]
10
(3) fOSC 650 kHz, VIN 2.8 V3.8 V
4.0
VIN 3.5
[V] 3.0
2.5
20
10
0
time [ms]
10
(5) fOSC 280 kHz, VIN 2.8 V3.8 V
4.0
VIN 3.5
[V] 3.0
2.5
20
28
10
0
time [ms]
10
9.40
9.30 VOUT
9.20 [V]
9.10
20
9.40
9.30 VOUT
9.20 [V]
9.10
20
9.40
9.30 VOUT
9.20 [V]
9.10
20
(2) fOSC 1080 kHz, VIN 3.8 V2.8 V
4.0
VIN 3.5
[V] 3.0
2.5
20
10
0
time [ms]
10
(4) fOSC 650 kHz, VIN 3.8 V2.8 V
4.0
VIN 3.5
[V] 3.0
2.5
20
10
0
time [ms]
10
(6) fOSC 280 kHz, VIN 3.8 V2.8 V
4.0
VIN 3.5
[V] 3.0
2.5
20
10
0
time [ms]
10
9.40
9.30 VOUT
9.20 [V]
9.10
20
9.40
9.30 VOUT
9.20 [V]
9.10
20
9.40
9.30 VOUT
9.20 [V]
9.10
20
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
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Reference Data
1. Reference data for external parts
Table 6 Properties of External Parts
Element Name
Inductor
Diode
Output capacitor
(ceramic)
Transistor
Product Name
Manufacture
LDR655312T
TDK Corporation
RB491D
Rohm Co., Ltd.
MCH3406
Sanyo Electric Co., Ltd.
Characteristics
10 H, DCR*1 307 m, IMAX*2 0.7 A,
Height 1.2 mm
VF*3 0.45 V, IF*4 1.0 A
16 V, 10 F
VDSS*5 20 V, VGSS*6 10 V, Ciss*7 280 pF,
RDS(ON)*8 82 m max. (VGS*9 2.5 V, ID*10 1 A)
*1. DCR :
DC resistance
*2. IMAX :
Maximum allowable current
*3. VF :
Forward voltage
*4. IF :
Forward current
*5. VDSS :
Drain to source voltage (when short circuited between the gate and source)
*6. VGSS :
Gate to source voltage (when short circuited between the drain and source)
*7. Ciss :
Input capacitance
*8. RDS(ON) : Drain to source on resistance
*9. VGS :
Gate to source voltage
*10. ID :
Drain current
Caution The values shown in the characteristics column of Table 6 above are based on the materials
provided by each manufacturer. However, consider the characteristics of the original materials
when using the above products.
29
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
2. Reference data (1)
The data of (a) output current (IOUT) vs. efficiency () characteristics and (b) output current (IOUT) vs. output voltage
(VOUT) characteristics is shown below.
2. 1 VOUT 13.1 V (RFB1 7.5 k, RFB2 620 )
(1) fOSC 1080 kHz, MaxDuty 73% (ROSC 120 k, RDuty 180 k)
(b) IOUT vs. VOUT
13.20
VOUT [V]
13.15
[%]
(a) IOUT vs.
100
90
80
70
60
50
40
30
20
10
0
0.01
1
10
IOUT [mA]
100
13.05
13.00
12.95
VIN = 5.0 V
0.1
13.10
12.90
0.01
1000
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
(2) fOSC 650 kHz, MaxDuty 73% (ROSC 200 k, RDuty 300 k)
(b) IOUT vs. VOUT
13.20
VOUT [V]
13.15
[%]
(a) IOUT vs.
100
90
80
70
60
50
40
30
20
10
0
0.01
1
10
IOUT [mA]
100
13.05
13.00
12.95
VIN = 5.0 V
0.1
13.10
12.90
0.01
1000
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
(3) fOSC 280 kHz, MaxDuty 73% (ROSC 470 k, RDuty 750 k)
(b) IOUT vs. VOUT
13.20
VOUT [V]
13.15
[%]
(a) IOUT vs.
100
90
80
70
60
50
40
30
20
10
0
0.01
30
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
13.10
13.05
13.00
12.95
12.90
0.01
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
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2. 2 VOUT 9.2 V (RFB1 8.2 k, RFB2 1.0 k)
(1) fOSC 1080 kHz, MaxDuty 73% (ROSC 120 k, RDuty 180 k)
(b) IOUT vs. VOUT
9.30
VOUT [V]
9.25
[%]
(a) IOUT vs.
100
90
80
70
60
50
40
30
20
10
0
0.01
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
9.20
9.15
9.10
VIN = 3.3 V
VIN = 5.0 V
9.05
9.00
0.01
1000
0.1
1
10
IOUT [mA]
100
1000
(2) fOSC 650 kHz, MaxDuty 73% (ROSC 200 k, RDuty 300 k)
(b) IOUT vs. VOUT
9.30
VOUT [V]
9.25
[%]
(a) IOUT vs.
100
90
80
70
60
50
40
30
20
10
0
0.01
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
9.20
9.15
9.10
VIN = 3.3 V
VIN = 5.0 V
9.05
9.00
0.01
1000
0.1
1
10
IOUT [mA]
100
1000
(3) fOSC 280 kHz, MaxDuty 73% (ROSC 470 k, RDuty 750 k)
(b) IOUT vs. VOUT
9.30
VOUT [V]
9.25
[%]
(a) IOUT vs.
100
90
80
70
60
50
40
30
20
10
0
0.01
VIN = 3.3 V
VIN = 5.0 V
0.1
1
10
IOUT [mA]
100
1000
9.20
9.15
9.10
VIN = 3.3 V
VIN = 5.0 V
9.05
9.00
0.01
0.1
1
10
IOUT [mA]
100
1000
31
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
2. 3 VOUT 6.1 V (RFB1 5.1 k, RFB2 1.0 k)
(1) fOSC 1080 kHz, MaxDuty 73% (ROSC 120 k, RDuty 180 k)
(b) IOUT vs. VOUT
6.20
VOUT [V]
6.15
[%]
(a) IOUT vs.
100
90
80
70
60
50
40
30
20
10
0
0.01
VIN = 2.5 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
100
6.10
6.05
6.00
VIN = 2.5 V
VIN = 3.3 V
5.95
5.90
0.01
1000
0.1
1
10
IOUT [mA]
100
1000
(2) fOSC 650 kHz, MaxDuty 73% (ROSC 200 k, RDuty 300 k)
(b) IOUT vs. VOUT
6.20
VOUT [V]
6.15
[%]
(a) IOUT vs.
100
90
80
70
60
50
40
30
20
10
0
0.01
VIN = 2.5 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
100
6.10
6.05
6.00
VIN = 2.5 V
VIN = 3.3 V
5.95
5.90
0.01
1000
0.1
1
10
IOUT [mA]
100
1000
(3) fOSC 280 kHz, MaxDuty 73% (ROSC 470 k, RDuty 750 k)
(b) IOUT vs. VOUT
6.20
VOUT [V]
6.15
[%]
(a) IOUT vs.
100
90
80
70
60
50
40
30
20
10
0
0.01
32
VIN = 2.5 V
VIN = 3.3 V
0.1
1
10
IOUT [mA]
100
1000
6.10
6.05
6.00
VIN = 2.5 V
VIN = 3.3 V
5.95
5.90
0.01
0.1
1
10
IOUT [mA]
100
1000
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
3. Reference data (2)
The data of output current (IOUT) vs. ripple voltage (Vr) characteristics is shown below.
3. 1 VOUT 13.1 V (RFB1 7.5 k, RFB2 620 )
100
1000
100
1000
100
1000
100
1000
Vr [mV]
(3) fOSC 280 kHz, MaxDuty 73%
(ROSC 470 k, RDuty 750 k)
100
90
VIN = 5.0 V
80
70
60
50
40
30
20
10
0
0.1
0.01
1
10
IOUT [mA]
(2) fOSC 650 kHz, MaxDuty 73%
(ROSC 200 k, RDuty 300 k)
100
90
VIN = 5.0 V
80
70
60
50
40
30
20
10
0
0.1
0.01
1
10
IOUT [mA]
Vr [mV]
Vr [mV]
(1) fOSC 1080 kHz, MaxDuty 73 %
(ROSC 120 k, RDuty 180 k)
100
90
VIN = 5.0 V
80
70
60
50
40
30
20
10
0
0.1
0.01
1
10
IOUT [mA]
3. 2 VOUT 9.2 V (RFB1 8.2 k, RFB2 1.0 k)
100
1000
100
1000
Vr [mV]
(3) fOSC 280 kHz, MaxDuty 73%
(ROSC 470 k, RDuty 750 k)
100
VIN = 3.3 V
90
80
VIN = 5.0 V
70
60
50
40
30
20
10
0
0.1
0.01
1
10
IOUT [mA]
(2) fOSC 650 kHz, MaxDuty 73%
(ROSC 200 k, RDuty 300 k)
100
90
VIN = 3.3 V
80
VIN = 5.0 V
70
60
50
40
30
20
10
0
0.1
0.01
1
10
IOUT [mA]
Vr [mV]
Vr [mV]
(1) fOSC 1080 kHz, MaxDuty 73%
(ROSC 120 k, RDuty 180 k)
100
90
VIN = 3.3 V
80
VIN = 5.0 V
70
60
50
40
30
20
10
0
0.1
0.01
1
10
IOUT [mA]
33
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
3. 3 VOUT 6.1 V (RFB1 5.1 k, RFB2 1.0 k)
100
1000
100
1000
Vr [mV]
(3) fOSC 280 kHz, MaxDuty 73%
(ROSC 470 k, RDuty 750 k)
100
VIN = 2.5 V
90
80
VIN = 3.3 V
70
60
50
40
30
20
10
0
0.1
0.01
1
10
IOUT [mA]
34
(2) fOSC 650 kHz, MaxDuty 73%
(ROSC 200 k, RDuty 300 k)
100
VIN = 2.5 V
90
80
VIN = 3.3 V
70
60
50
40
30
20
10
0
0.1
0.01
1
10
IOUT [mA]
Vr [mV]
Vr [mV]
(1) fOSC 1080 kHz, MaxDuty 73%
(ROSC 120 k, RDuty 180 k)
100
90
VIN = 2.5 V
80
VIN = 3.3 V
70
60
50
40
30
20
10
0
0.1
0.01
1
10
IOUT [mA]
100
1000
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
Marking Specifications
1. SNT-8A
8
Top view
7
6
5
(1):
(2) to (4):
(5), (6):
(7) to (11):
(1) (2) (3) (4)
Blank
Product code (Refer to Product name vs. Product code)
Blank
Lot number
(5) (6) (7) (8)
(9) (10) (11)
1
2
3
4
Product name vs. Product code
Product name
S-8333CAAA-I8T1U
S-8333CAAB-I8T1U
S-8333CAAC-I8T1U
S-8333CABA-I8T1U
S-8333CABB-I8T1U
S-8333CABC-I8T1U
S-8333CACA-I8T1U
S-8333CACB-I8T1U
S-8333CACC-I8T1U
S-8333CADA-I8T1U
S-8333CADB-I8T1U
S-8333CADC-I8T1U
S-8333CAEA-I8T1U
S-8333CAEB-I8T1U
S-8333CAEC-I8T1U
S-8333CAFA-I8T1U
S-8333CAFB-I8T1U
S-8333CAFC-I8T1U
S-8333CAGA-I8T1U
S-8333CAGB-I8T1U
S-8333CAGC-I8T1U
S-8333CAHA-I8T1U
S-8333CAHB-I8T1U
S-8333CAHC-I8T1U
S-8333CAIA-I8T1U
S-8333CAIB-I8T1U
S-8333CAIC-I8T1U
S-8333CBAA-I8T1U
S-8333CBAB-I8T1U
S-8333CBAC-I8T1U
S-8333CBBA-I8T1U
S-8333CBBB-I8T1U
S-8333CBBC-I8T1U
S-8333CBCA-I8T1U
S-8333CBCB-I8T1U
S-8333CBCC-I8T1U
S-8333CBDA-I8T1U
S-8333CBDB-I8T1U
S-8333CBDC-I8T1U
S-8333CBEA-I8T1U
S-8333CBEB-I8T1U
(2)
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
U
Product code
(3)
(4)
2
A
2
B
2
C
2
D
2
E
2
F
2
G
2
H
2
I
2
J
2
K
2
L
2
M
2
N
2
O
2
P
2
Q
2
R
2
S
2
T
2
U
2
V
2
W
2
X
2
Y
2
Z
2
3
3
A
3
B
3
C
3
D
3
E
3
F
3
G
3
H
3
I
3
J
3
K
3
L
3
M
3
N
Product name
S-8333CBEC-I8T1U
S-8333CBFA-I8T1U
S-8333CBFB-I8T1U
S-8333CBFC-I8T1U
S-8333CBGA-I8T1U
S-8333CBGB-I8T1U
S-8333CBGC-I8T1U
S-8333CBHA-I8T1U
S-8333CBHB-I8T1U
S-8333CBHC-I8T1U
S-8333CBIA-I8T1U
S-8333CBIB-I8T1U
S-8333CBIC-I8T1U
S-8333CCAA-I8T1U
S-8333CCAB-I8T1U
S-8333CCAC-I8T1U
S-8333CCBA-I8T1U
S-8333CCBB-I8T1U
S-8333CCBC-I8T1U
S-8333CCCA-I8T1U
S-8333CCCB-I8T1U
S-8333CCCC-I8T1U
S-8333CCDA-I8T1U
S-8333CCDB-I8T1U
S-8333CCDC-I8T1U
S-8333CCEA-I8T1U
S-8333CCEB-I8T1U
S-8333CCEC-I8T1U
S-8333CCFA-I8T1U
S-8333CCFB-I8T1U
S-8333CCFC-I8T1U
S-8333CCGA-I8T1U
S-8333CCGB-I8T1U
S-8333CCGC-I8T1U
S-8333CCHA-I8T1U
S-8333CCHB-I8T1U
S-8333CCHC-I8T1U
S-8333CCIA-I8T1U
S-8333CCIB-I8T1U
S-8333CCIC-I8T1U
Product code
(2)
(3)
(4)
U
3
O
U
3
P
U
3
Q
U
3
R
U
3
S
U
3
T
U
3
U
U
3
V
U
3
W
U
3
X
U
3
Y
U
3
Z
U
3
3
U
4
A
U
4
B
U
4
C
U
4
D
U
4
E
U
4
F
U
4
G
U
4
H
U
4
I
U
4
J
U
4
K
U
4
L
U
4
M
U
4
N
U
4
O
U
4
P
U
4
Q
U
4
R
U
4
S
U
4
T
U
4
U
U
4
V
U
4
W
U
4
X
U
4
Y
U
4
Z
U
4
3
35
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_02
S-8333 Series
2. 8-Pin TSSOP
Top view
1
2
3
4
8
(1) (2) (3) (4)
7
(5) (6) (7) (8)
(1) to (4):
(5) to (8):
(9) to (14):
Product name: 8333 (Fixed)
Function code (Refer to Product name vs. Function code)
Lot number
6
(9) (10) (11) (12) (13) (14)
5
Product name vs. Function code
Product name
S-8333CAAA-T8T1y
S-8333CAAB-T8T1y
S-8333CAAC-T8T1y
S-8333CABA-T8T1y
S-8333CABB-T8T1y
S-8333CABC-T8T1y
S-8333CACA-T8T1y
S-8333CACB-T8T1y
S-8333CACC-T8T1y
S-8333CADA-T8T1y
S-8333CADB-T8T1y
S-8333CADC-T8T1y
S-8333CAEA-T8T1y
S-8333CAEB-T8T1y
S-8333CAEC-T8T1y
S-8333CAFA-T8T1y
S-8333CAFB-T8T1y
S-8333CAFC-T8T1y
S-8333CAGA-T8T1y
S-8333CAGB-T8T1y
S-8333CAGC-T8T1y
S-8333CAHA-T8T1y
S-8333CAHB-T8T1y
S-8333CAHC-T8T1y
S-8333CAIA-T8T1y
S-8333CAIB-T8T1y
S-8333CAIC-T8T1y
S-8333CBAA-T8T1y
S-8333CBAB-T8T1y
S-8333CBAC-T8T1y
S-8333CBBA-T8T1y
S-8333CBBB-T8T1y
S-8333CBBC-T8T1y
S-8333CBCA-T8T1y
S-8333CBCB-T8T1y
S-8333CBCC-T8T1y
S-8333CBDA-T8T1y
S-8333CBDB-T8T1y
S-8333CBDC-T8T1y
S-8333CBEA-T8T1y
S-8333CBEB-T8T1y
(5)
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
Function code
(6) (7) (8)
A
A
A
A
A
B
A
A
C
A
B
A
A
B
B
A
B
C
A
C
A
A
C
B
A
C
C
A
D
A
A
D
B
A
D
C
A
E
A
A
E
B
A
E
C
A
F
A
A
F
B
A
F
C
A
G
A
A
G
B
A
G
C
A
H
A
A
H
B
A
H
C
A
I
A
A
I
B
A
I
C
B
A
A
B
A
B
B
A
C
B
B
A
B
B
B
B
B
C
B
C
A
B
C
B
B
C
C
B
D
A
B
D
B
B
D
C
B
E
A
B
E
B
Product name
S-8333CBEC-T8T1y
S-8333CBFA-T8T1y
S-8333CBFB-T8T1y
S-8333CBFC-T8T1y
S-8333CBGA-T8T1y
S-8333CBGB-T8T1y
S-8333CBGC-T8T1y
S-8333CBHA-T8T1y
S-8333CBHB-T8T1y
S-8333CBHC-T8T1y
S-8333CBIA-T8T1y
S-8333CBIB-T8T1y
S-8333CBIC-T8T1y
S-8333CCAA-T8T1y
S-8333CCAB-T8T1y
S-8333CCAC-T8T1y
S-8333CCBA-T8T1y
S-8333CCBB-T8T1y
S-8333CCBC-T8T1y
S-8333CCCA-T8T1y
S-8333CCCB-T8T1y
S-8333CCCC-T8T1y
S-8333CCDA-T8T1y
S-8333CCDB-T8T1y
S-8333CCDC-T8T1y
S-8333CCEA-T8T1y
S-8333CCEB-T8T1y
S-8333CCEC-T8T1y
S-8333CCFA-T8T1y
S-8333CCFB-T8T1y
S-8333CCFC-T8T1y
S-8333CCGA-T8T1y
S-8333CCGB-T8T1y
S-8333CCGC-T8T1y
S-8333CCHA-T8T1y
S-8333CCHB-T8T1y
S-8333CCHC-T8T1y
S-8333CCIA-T8T1y
S-8333CCIB-T8T1y
S-8333CCIC-T8T1y
(5)
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
Function code
(6)
(7)
B
E
B
F
B
F
B
F
B
G
B
G
B
G
B
H
B
H
B
H
B
I
B
I
B
I
C
A
C
A
C
A
C
B
C
B
C
B
C
C
C
C
C
C
C
D
C
D
C
D
C
E
C
E
C
E
C
F
C
F
C
F
C
G
C
G
C
G
C
H
C
H
C
H
C
I
C
I
C
I
Remark 1. y: S or U
2. Please select products of environmental code = U for Sn 100%, halogen-free products.
36
(8)
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
A
B
C
1.97±0.03
8
7
6
5
3
4
+0.05
1
0.5
2
0.08 -0.02
0.48±0.02
0.2±0.05
No. PH008-A-P-SD-2.1
TITLE
SNT-8A-A-PKG Dimensions
No.
PH008-A-P-SD-2.1
ANGLE
UNIT
mm
ABLIC Inc.
+0.1
ø1.5 -0
2.25±0.05
4.0±0.1
2.0±0.05
ø0.5±0.1
0.25±0.05
0.65±0.05
4.0±0.1
4 321
5 6 78
Feed direction
No. PH008-A-C-SD-2.0
TITLE
SNT-8A-A-Carrier Tape
No.
PH008-A-C-SD-2.0
ANGLE
UNIT
mm
ABLIC Inc.
12.5max.
9.0±0.3
Enlarged drawing in the central part
ø13±0.2
(60°)
(60°)
No. PH008-A-R-SD-1.0
TITLE
SNT-8A-A-Reel
No.
PH008-A-R-SD-1.0
QTY.
ANGLE
UNIT
mm
ABLIC Inc.
5,000
0.52
2.01
2
0.52
0.2 0.3
1.
2.
1
(0.25 mm min. / 0.30 mm typ.)
(1.96 mm ~ 2.06 mm)
1.
2.
3.
4.
0.03 mm
SNT
1. Pay attention to the land pattern width (0.25 mm min. / 0.30 mm typ.).
2. Do not widen the land pattern to the center of the package (1.96 mm to 2.06mm).
Caution 1. Do not do silkscreen printing and solder printing under the mold resin of the package.
2. The thickness of the solder resist on the wire pattern under the package should be 0.03 mm
or less from the land pattern surface.
3. Match the mask aperture size and aperture position with the land pattern.
4. Refer to "SNT Package User's Guide" for details.
1.
2.
(0.25 mm min. / 0.30 mm typ.)
(1.96 mm ~ 2.06 mm)
TITLE
No. PH008-A-L-SD-4.1
SNT-8A-A
-Land Recommendation
PH008-A-L-SD-4.1
No.
ANGLE
UNIT
mm
ABLIC Inc.
+0.3
3.00 -0.2
8
5
1
4
0.17±0.05
0.2±0.1
0.65
No. FT008-A-P-SD-1.2
TITLE
TSSOP8-E-PKG Dimensions
No.
FT008-A-P-SD-1.2
ANGLE
UNIT
mm
ABLIC Inc.
4.0±0.1
2.0±0.05
ø1.55±0.05
0.3±0.05
+0.1
8.0±0.1
ø1.55 -0.05
(4.4)
+0.4
6.6 -0.2
1
8
4
5
Feed direction
No. FT008-E-C-SD-1.0
TITLE
TSSOP8-E-Carrier Tape
FT008-E-C-SD-1.0
No.
ANGLE
UNIT
mm
ABLIC Inc.
13.4±1.0
17.5±1.0
Enlarged drawing in the central part
ø21±0.8
2±0.5
ø13±0.5
No. FT008-E-R-SD-1.0
TITLE
TSSOP8-E-Reel
No.
FT008-E-R-SD-1.0
QTY.
ANGLE
UNIT
mm
ABLIC Inc.
3,000
Disclaimers (Handling Precautions)
1.
All the information described herein (product data, specifications, figures, tables, programs, algorithms and
application circuit examples, etc.) is current as of publishing date of this document and is subject to change without
notice.
2.
The circuit examples and the usages described herein are for reference only, and do not guarantee the success of
any specific mass-production design.
ABLIC Inc. is not liable for any losses, damages, claims or demands caused by the reasons other than the products
described herein (hereinafter "the products") or infringement of third-party intellectual property right and any other
right due to the use of the information described herein.
3.
ABLIC Inc. is not liable for any losses, damages, claims or demands caused by the incorrect information described
herein.
4.
Be careful to use the products within their ranges described herein. Pay special attention for use to the absolute
maximum ratings, operation voltage range and electrical characteristics, etc.
ABLIC Inc. is not liable for any losses, damages, claims or demands caused by failures and / or accidents, etc. due to
the use of the products outside their specified ranges.
5.
Before using the products, confirm their applications, and the laws and regulations of the region or country where they
are used and verify suitability, safety and other factors for the intended use.
6.
When exporting the products, comply with the Foreign Exchange and Foreign Trade Act and all other export-related
laws, and follow the required procedures.
7.
The products are strictly prohibited from using, providing or exporting for the purposes of the development of
weapons of mass destruction or military use. ABLIC Inc. is not liable for any losses, damages, claims or demands
caused by any provision or export to the person or entity who intends to develop, manufacture, use or store nuclear,
biological or chemical weapons or missiles, or use any other military purposes.
8.
The products are not designed to be used as part of any device or equipment that may affect the human body, human
life, or assets (such as medical equipment, disaster prevention systems, security systems, combustion control
systems, infrastructure control systems, vehicle equipment, traffic systems, in-vehicle equipment, aviation equipment,
aerospace equipment, and nuclear-related equipment), excluding when specified for in-vehicle use or other uses by
ABLIC, Inc. Do not apply the products to the above listed devices and equipments.
ABLIC Inc. is not liable for any losses, damages, claims or demands caused by unauthorized or unspecified use of
the products.
9.
In general, semiconductor products may fail or malfunction with some probability. The user of the products should
therefore take responsibility to give thorough consideration to safety design including redundancy, fire spread
prevention measures, and malfunction prevention to prevent accidents causing injury or death, fires and social
damage, etc. that may ensue from the products' failure or malfunction.
The entire system in which the products are used must be sufficiently evaluated and judged whether the products are
allowed to apply for the system on customer's own responsibility.
10. The products are not designed to be radiation-proof. The necessary radiation measures should be taken in the
product design by the customer depending on the intended use.
11. The products do not affect human health under normal use. However, they contain chemical substances and heavy
metals and should therefore not be put in the mouth. The fracture surfaces of wafers and chips may be sharp. Be
careful when handling these with the bare hands to prevent injuries, etc.
12. When disposing of the products, comply with the laws and ordinances of the country or region where they are used.
13. The information described herein contains copyright information and know-how of ABLIC Inc. The information
described herein does not convey any license under any intellectual property rights or any other rights belonging to
ABLIC Inc. or a third party. Reproduction or copying of the information from this document or any part of this
document described herein for the purpose of disclosing it to a third-party is strictly prohibited without the express
permission of ABLIC Inc.
14. For more details on the information described herein or any other questions, please contact ABLIC Inc.'s sales
representative.
15. This Disclaimers have been delivered in a text using the Japanese language, which text, despite any translations into
the English language and the Chinese language, shall be controlling.
2.4-2019.07
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