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S-8333CBAC-T8T1U Datasheet(PDF) 7 Page - Seiko Instruments Inc

Part # S-8333CBAC-T8T1U
Description  PWM CONTROL SWITCHING REGULATOR CONTROLLER
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Manufacturer  SII [Seiko Instruments Inc]
Direct Link  http://www.sii.co.jp
Logo SII - Seiko Instruments Inc

S-8333CBAC-T8T1U Datasheet(HTML) 7 Page - Seiko Instruments Inc

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STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.4.2_01
S-8333 Series
7
Electrical Characteristics
Table 4 Electrical Characteristics
(Unless otherwise specified: VIN
= 3.3 V, Ta = 25°C)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
Operating input voltage VIN
1.8
6.0
V
2
FB voltage
VFB
0.985
1.000
1.015
V
2
Current consumption
ISS1
fosc
= 650 kHz
VFB
= 0.95 V
450
700
μA
1
EXT pin output current
IEXTH
VEXT
= VIN − 0.4 V
−100
−60
mA
1
IEXTL
VEXT
= 0.4 V
100
160
mA
1
FB voltage temperature
coefficient
ΔVFB
ΔTa
Ta
= −40 to +85°C
±100
ppm/
°C2
FB pin input current
IFB
−0.1
+0.1
μA
1
Oscillation frequency*1 fosc
When fosc
= 1080 kHz is set
(ROSC
= 120 kΩ)
When fosc
= 650 kHz is set
(ROSC
= 200 kΩ)
When fosc
= 280 kHz is set
(ROSC
= 470 kΩ)
VFB
= 0.9 V
Waveform on EXT pin is measured.
fosc
× 0.9
fosc
fosc
× 1.1
kHz
1
Oscillation frequency
temperature coefficient
Δfosc
ΔTa
Ta
= −40 to +85°C
fosc
= 650 kHz
1000
ppm/
°C1
Max. duty*2
MaxDuty
fosc
= 1080 kHz (ROSC = 120 kΩ)
MaxDuty
= 88.5% (RDuty = 62 kΩ)
MaxDuty
= 73% (RDuty = 180 kΩ)
MaxDuty
= 47% (RDuty = 390 kΩ)
MaxDuty
− 5
MaxDuty
MaxDuty
+ 5
%
1
fosc
= 650 kHz (ROSC = 200 kΩ)
MaxDuty
= 88.5% (RDuty = 100 kΩ)
Soft-start time
tSS
tSS
= 10 ms, 15 ms, 20 ms
Selected in three steps
tSS
× 0.75
tSS
tSS
× 1.5
ms
1
Short-circuit protection
delay time*3
tPRO
tPRO
= 50 ms
(CSP
= 0.1 μF)
37.5
50
75
ms
1
UVLO detection voltage VUVLO
VUVLO
= 1.5 V to 2.3 V
Selected in 0.1 V steps
VUVLO
× 0.95
VUVLO
VUVLO
× 1.05
V
1
UVLO hysteresis width VUVLOHYS
VUVLOHYS
= 0.1 V to 0.3 V
Selected in 0.1 V steps
VUVLOHYS
× 0.6
VUVLOHYS
VUVLOHYS
× 1.4
V
1
CC pin output current
ICCH
VFB
= 2 V
−60
−45
−34.5
μA
1
ICCL
VFB
= 0 V
34.5
45
60
μA
1
Timer latch reset voltage
VRTLT1
Within short-circuit protection delay
time
0.7
1.0
1.3
V
1
VRTLT2
After short-circuit protection circuit
operated
VUVLO
× 0.95
VUVLO
VUVLO
× 1.05
V
1
*1. The recommended range of the resistance (Rosc) for oscillation frequency is Rosc
= 120 kΩ to 470 kΩ (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 μF as a target maximum value due to discharge time of the capacitor.


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