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SC656ULTRT Datasheet(PDF) 4 Page - Semtech Corporation |
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SC656ULTRT Datasheet(HTML) 4 Page - Semtech Corporation |
4 / 17 page SC656 4 Parameter Symbol Conditions Min Typ Max Units Current Transition Settling Time t s Duty cycle change from 00% to 50%()(4) 0.5 s ENM/ENS Low Time t LT Time that voltage on ENM or ENS can be low with- out disabling the device 5 ms x Mode to .5x Mode Falling Transition Voltage V TRANSx I OUT = 70mA, IBLn = 0mA, VOUT = 3.2V 3.26 V .5x Mode to 2x Mode Falling Transition Voltage V TRANS.5x I OUT = 70mA, IBLn = 0mA, VOUT = 4.0V (3) 2.90 V Current Sink Off-State Leakage Current I BLn(off) V IN = VBLn = 4.2V 0. µA Charge Pump Frequency f PUMP V IN = 3.2V 250 kHz Output Short Circuit Current Limit I OUT(SC) OUT pin shorted to GND 50 mA V OUT > 2.5V 400 Under Voltage Lockout Threshold V UVLO Increasing V IN — lockout released 2.4 V UVLO Hysteresis V UVLO-HYS 500 mV Over-Voltage Protection V OVP OUT pin open circuit, V OUT = VOVP, VIN rising threshold 5.7 6.0 V Over-Temperature T OT Rising Temperature 65 °C OT Hysteresis T OT-HYS 25 °C Digital Logic Pins — ENM, ENS, BANK2, AND BANK1 Input High Threshold V IH V IN = 5.5V .4 V Input Low Threshold V IL V IN = 2.9V 0.4 V Input High Current I IH V IN = 5.5V µA Input Low Current I IL V IN = 5.5V µA Electrical Characteristics (continued) Notes: () Guaranteed by design (2) Current matching equals ± [I BL(MAX) - IBL(MIN] / [IBL(MAX) + IBL(MIN)]. (3) Test voltage is V OUT = 4.0V — a relatively extreme LED voltage used to force a transition during test. Typically VOUT = 3.2V for white LEDs. (4) The settling time is affected by the magnitude of change in the PWM duty cycle. |
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