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S8540 Datasheet(PDF) 7 Page - Seiko Instruments Inc |
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S8540 Datasheet(HTML) 7 Page - Seiko Instruments Inc |
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7 / 36 page  STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.4.0_01 S-8540/8541 Series 7 Electrical Characteristics 1. S-8540/8541 Series A, C types Table 5 (Ta = 25 °C, unless otherwise specified) Parameter Symbol Conditions Min. Typ. Max. Units Measure- ment Circuit Output voltage *1 VOUT (E) VIN = VOUT (S) × 1.5 IOUT = 120 mA VOUT (S) × 0.980 VOUT (S) VOUT (S) × 1.020 V 2 Input voltage VIN − 2.5 − 10.0 V 1 Current consumption 1 ISS1 VIN = VOUT (S) × 1.5 100 % duty ratio S-8540/8541Axx − 180 300 μA 1 S-8540/8541Cxx − 140 240 Current consumption during shutdown ISSS VON/OFF = 0 V VOUT = VOUT (S) × 0.95 − − 1.0 μA 1 EXT pin output current IEXTH VIN = 10 V, VEXT = VIN − 0.2 V − 32 − 48 − mA 1 IEXTL VIN = 10 V, VEXT = 0.2 V 45 66 − mA 1 Line regulation ΔVOUT1 VOUT (S) × 1.1 ≤ VIN ≤ 10 V, IOUT = 120 mA − 30 60 mV 2 Load regulation ΔVOUT2 VIN = VOUT (S) × 1.5, 10 μA ≤ IOUT ≤ 150 mA − 30 60 mV 2 Output voltage temperature coefficient Δ Δ V Ta V OUT OUT • VIN = VOUT (S) × 1.5, IOUT = 120 mA − 40 ≤ Ta ≤ + 85 °C − ± 100 − ppm/ °C 2 Oscillation frequency fOSC Measure waveform at the EXT pin. S-8540/8541Axx 510 600 690 kHz 2 S-8540/8541Cxx 255 300 345 Maximum duty ratio MaxDuty Measure waveform at the EXT pin. 100 − − % 2 PWM/PFM-control switch duty ratio *2 PFMDuty VIN = VOUT (S) × 1.5, no load 19 29 39 % 2 Current limit detection voltage VSENSE VIN = VOUT (S) × 1.5, Measure waveform at the EXT pin. 100 125 150 mV 1 SENSE pin input current ISENSE VIN = VOUT (S) × 1.5, VSENSE = VIN − 0.1 V 6.7 11.2 16.8 μA 1 Shutdown pin input voltage VSH VIN = VOUT (S) × 1.5, Judge VOUT(S) × 0.98. 2.3 − − V 2 VSL VIN = VOUT (S) × 1.5, Judge CVREF pin "L". − − 0.3 V 1 Shutdown pin input leakage current ISH VIN = VOUT (S) × 1.5, VON/OFF = VOUT − 0.1 − 0.1 μA 1 ISL VIN = VOUT (S) × 1.5, VON/OFF = 0 V − 0.1 − 0.1 μA 1 Soft-start time tSS Time until VOUT (E) reaches 90% or higher of the VOUT(S) 7.0 12.0 17.0 ms 2 Efficiency EFFI − − 90 − % 2 External components Coil (L) :Sumida Corporation. CDRH6D28-100 Diode (SD) :Matsushita Electric Inducstrial Co., Ltd. MA2Q737 (Schottky diode) Output capacitor (COUT) :Nichicon Corporation F93 (16 V, 47 μF, tantalum) Input capacitor (CIN) :Nichicon Corporation F93 (16 V, 47 μF, tantalum) Transistor (PSW) :Toshiba Corporation 2SA1213 Base resistor (Rb) :100 m Ω Base capacitor (Cb) :2200 pF CVL :1.0 μF CSS :0.047 μF RSS :220 k Ω RSENSE :100 m Ω Condition: Recommended parts are used unless otherwise specified. VIN =VOUT (S) ×1.5 V, IOUT = 120 mA (When VOUT (S) ≤ 1.6 V, then VIN = 2.5 V) *1. VOUT (S) : Specified output voltage value, VOUT (E) : Actual output voltage value *2. Applied to the S-8541 series only Caution 1. Line regulation and load regulation may change greatly due to GND wiring when VIN is high. 2. In the S-8540 series (PWM control), a state in which the duty ratio 0% continues for several clocks may occur when the input voltage is high and the output current is low. In this case, the operation changes to the pseudo PFM mode, but the ripple voltage hardly increases. |
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