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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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RT9451 Fiches technique(PDF) 8 Page - Richtek Technology Corporation |
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RT9451 Fiches technique(HTML) 8 Page - Richtek Technology Corporation |
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8 / 37 page  RT9451 8 DS9451-00 September 2013 www.richtek.com © Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Parameter Symbol Test Conditions Min Typ Max Unit Charger Protection Input VIN Threshold Voltage Threshold over VIN to turn off converter during charge 11 12 13 V VIN Hysteresis VIN_OVP VIN falling from above VIN_OVP -- 140 -- mV Battery OVP Threshold Voltage VOVP_BATS VBATS threshold over VOREG to turn off charger during charge (% VOREG) 110 117 121 % OVP Hysteresis ΔOVP_BATS Lower limit for VBATS falling from > VOVP (% VOREG) -- 11 -- % Cycle-by-Cycle Current Limit for Charge ILIMIT Charge Mode Operation 5 7 9 A Trickle to Fast Charge Threshold VSHORT VBATS rising, VSHORT connected to VDDP 1.9 2.1 2.2 V VSHORT Hysteresis ΔVSHORT VBATS falling from above VSHORT -- 100 -- mV Trickle Charge Charging Current ISHORT VBATS ≤ VSHORT 70 80 90 mA Thermal Regulation Threshold Charge current begins to taper down -- 120 -- °C Time Constant for the 32-Second Timer T32S 32 Second Mode -- 32 -- s LDO LDO Output Voltage VLDO VIN = 5.5V 4.8 4.9 5 V PSRR f = 100Hz, CLDO = 1μF -- 60 -- dB Maximum LDO Output Current ILDO 60 -- -- mA Dropout Voltage VDO VIN = 4.5V, ILDO = 50mA -- 100 250 mV D+ / D − Detection D+ Voltage Source VDP_SCR 0.5 0.6 0.7 V D+ Voltage Source Output Current 250 -- -- μA D − Current Sink IDM_SINK 50 100 150 μA DM Pin, Switch Open -- 4.5 5 Input Capacitance CI DP Pin, Switch Open -- 4.5 5 pF DM Pin, Switch Open −1 -- 1 Input Leakage II DP Pin, Switch Open −1 -- 1 μA DP Low Comparator Threshold VDP_LOW 0.8 -- -- V DM High Comparator Threshold VDM_HIGH 0.8 -- -- V DM Low Comparator Threshold VDM_LOW -- -- 475 mV Logic Levels and Timing Characteristics (SCL, SDA, INT) Output Low Threshold Level VOL IO = 3mA, Sink Current (SDA, INT) -- -- 0.4 V Input Low Threshold Level -- -- 0.4 V |
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