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S8520 Datasheet(PDF) 9 Page - Seiko Instruments Inc |
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S8520 Datasheet(HTML) 9 Page - Seiko Instruments Inc |
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9 / 44 page  STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.9.0_01 S-8520/8521 Series 9 Electrical Characteristics 1. A type, B type Table 5 (Ta = +25°C unless otherwise specified) Item Symbol Conditions Min. Typ. Max. Unit Test Circuit Output voltage*1 VOUT(E) − VOUT(S) × 0.976 VOUT(S) VOUT(S) × 1.024 V 3 Input voltage VIN − A type 2.5 − 10.0 V 2 B type 2.5 − 16.0 V 2 Current consumption 1 ISS1 VOUT = VOUT(S) × 1.2 − 35 60 μA 2 Current consumption during shutdown ISSS VON/OFF ______ = 0 V − − 0.5 μA 2 EXT pin output current IEXTH VEXT = VIN − 0.4 V S-8520/8521x15 to 24 −2.3 −4.5 − mA − S-8520/8521x25 to 34 −3.7 −7.0 − mA − S-8520/8521x35 to 44 −5.3 −9.3 − mA − S-8520/8521x45 to 54 −6.7 −11.3 − mA − S-8520/8521x55 to 60 −8.0 −13.3 − mA − IEXTL VEXT = 0.4 V S-8520/8521x15 to 24 +4.3 +8.4 − mA − S-8520/8521x25 to 34 +7.0 +13.2 − mA − S-8520/8521x35 to 44 +9.9 +17.5 − mA − S-8520/8521x45 to 54 12.6 +21.4 − mA − S-8520/8521x55 to 60 +15.0 +25.1 − mA − Line regulation ΔVOUT1 VOUT(S) ≤ 2.0 V VIN = 2.5 V to 2.94 V − 30 60 mV 3 VOUT(S) > 2.0 V VIN = VOUT(S) × 1.2 to 1.4 − 30 60 mV 3 Load regulation ΔVOUT2 Load current = 10 μA to IOUT × 1.25 − 30 60 mV 3 Output voltage temperature coefficient ΔVOUT ΔTa Ta = −40°C to +85°C − ±VOUT(S) × 5E − 5 − V/°C 3 Oscillation frequency fosc Measure waveform at EXT pin. VOUT(S) ≤ 2.4 V 144 180 216 kHz 3 VOUT(S) ≥ 2.5 V 153 180 207 kHz 3 PWM / PFM control switching duty ratio (S-8521 Series) PFMDuty No load, measure waveform at EXT pin. 15 25 40 % 3 ON/OFF pin input voltage VSH Determine oscillation at EXT pin 1.8 − − V 2 VSL Determine oscillation stop at EXT pin − − 0.3 V 2 ON/OFF pin input leakage current ISH − −0.1 − 0.1 μA 1 ISL − −0.1 − 0.1 μA 1 Soft start time tss − 4.0 8.0 16.0 ms 3 Overload detection time (A type) tpro Time until the EXT pin reaches VIN after dropping VOUT to 0 V. 2.0 4.0 8.0 ms 2 Efficiency EFFI − − 93 − % 3 External parts Coil: Sumida Corporation CD54 (47 μH) Diode: Matsushita Electric Industrial Co., Ltd. MA720 (Shottky type) Capacitor: Matsushita Electric Industrial Co., Ltd. TE (16 V, 22 μF tantalum type) Transistor: Toshiba Corporation 2SA1213 Base resistance (Rb): 0.68 k Ω Base capacitor (Cb): 2200 pF (Ceramic type) Unless otherwise indicated, connect the recommended components to the IC. When VIN = VOUT(S) × 1.2 V (VIN = 2.5 V when VOUT(S) ≤ 2.0 V), IOUT = 120 mA, connect the ON/OFF ______ pin to the VIN pin. *1. VOUT(S): Specified output voltage value, VOUT(E): Actual output voltage value |
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