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S-8333CCGB-T8T1y Datasheet(PDF) 7 Page - Seiko Instruments Inc |
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S-8333CCGB-T8T1y Datasheet(HTML) 7 Page - Seiko Instruments Inc |
7 / 44 page 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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