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SC621EVB Datasheet(PDF) 5 Page - Semtech Corporation |
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SC621EVB Datasheet(HTML) 5 Page - Semtech Corporation |
5 / 23 page SC621 5 Electrical Characteristics (continued) Parameter Symbol Conditions Min Typ Max Units LDO Electrical Specifications (continued) Load Regulation ΔV LOAD V LDO1 = 3.3V, V IN = 3.7V, I LDO1 = 1mA to 100 mA 25 mV V LDO2 = 1.8V, V IN = 3.7V, I LDO2 = 1mA to 100 mA 20 Dropout Voltage(5) V D I LDO1 = 100mA 100 150 mV Current Limit I LIM 200 mA Power Supply Rejection Ratio PSRR LDO1 2.5V < V LDO1 < 3V, f < 1kHz, C BYP = 22nF, I LDO1 = 50mA, V IN = 3.7V with 0.5V P-P ripple 50 dB PSRR LDO2 f < 1kHz, C BYP = 22nF, I LDO2 = 50mA, V IN = 3.7V with 0.5V P-P ripple 60 Output Voltage Noise e n-LDO1 LDO1, 10Hz < f < 100kHz, C BYP = 22nF, C LDO = 1μF, I LDO1 = 50 mA, V IN = 3.7V, 2.5V < V LDO1 < 3V 100 μV RMS e n-LDO2 LDO2, 10Hz < f < 100kHz, C BYP = 22nF, C LDO = 1μF, I LDO2 = 50 mA, V IN = 3.7V 50 Minimum Output Capacitor C LDO(MIN) 1μF Digital I/O Electrical Specifications (FLEN, SWIF) Input High Threshold V IH V IN = 5.5V 1.6 V Input Low Threshold V IL V IN = 3.0V 0.4 V Input High Current I IH V IN = 5.5V -1 +1 μA Input Low Current I IL V IN = 5.5V -1 +1 μA SemWire Bit Rate f SWIF 10 75 kbit/s SemWire Start-up Time(6) t EN 1ms SemWire Disable Time(7) t DIS 10 ms SemWire Data Latch Delay(8) D DL 5 bit Notes: (1) ΔV F is the voltage difference between any two LEDs. (2) Once tripped, flash output will remain disabled until FLEN pin is cycled or reset via serial interface. (3) Current matching equals ± [I BL(MAX) - I BL(MIN ] / [I BL(MAX) + I BL(MIN) ]. (4) Test voltage is V OUT = 4.0V — a relatively extreme LED voltage — to force a transition during test. Typically V OUT = 3.2V for white LEDs. (5) Dropout is defined as (V IN - V LDO1 ) when V LDO1 drops 100mV from nominal. Dropout does not apply to LDO2 since it has a maximum output voltage of 1.8V. (6) The SemWire start-up time is the minimum period that the SWIF pin must be held high to enable the part before commencing communication. (7) The SemWire disable time is the minimum period that the SWIF pin must be pulled low to shut the part down. (8) The SemWire data latch delay is the maximum duration after communication has ended before the register is updated. |
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