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RT8856 Datasheet(PDF) 10 Page - Richtek Technology Corporation |
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RT8856 Datasheet(HTML) 10 Page - Richtek Technology Corporation |
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10 / 23 page  RT8856 10 DS8856-03 June 2011 www.richtek.com Parameter Symbol Test Conditions Min Typ Max Unit Current Limit Threshold Voltage (Average) VILIM Σ (VISENx − VISENx_N) / N, VOCSET = 0.625V, VILIMT(nom) = 25mV 23 25 27 mV Current Limit Threshold Voltage (per phase) VILIM_PH VILIMITPH / VILIMIT -- 150 -- % Thermal Shutdown Threshold TSD -- 160 -- °C Thermal Shutdown Hysteresis ΔTSD -- 10 -- °C Logic Inputs Logic-High VIH With respect to 3.3V, 70% 2.31 -- -- VRON Input Threshold Voltage Logic-Low VIL With respect to 3.3V, 30% -- -- 0.99 V Leakage Current of VRON −1 -- 1 μA Logic-High VIH With respect to 1.1V, 70% 0.77 -- -- DAC (VID0 − VID6), PSI and DPRSLPVR Input Threshold Voltage Logic-Low VIL With respect to 1.1V, 30% -- -- 0.33 V Leakage Current of DAC (VID0 − VID6), PSI and DPRSLPVR −1 -- 1 μA Power Good PGOOD Threshold VTH_PGOOD -- 1 -- V PGOOD Low Voltage VPGOOD IPGOOD = 4mA -- -- 0.4 V PGOOD Delay tPGOOD CLKEN Low to PGOOD High 3 -- 20 ms Clock Enable CLKEN Low Voltage VCLKEN ICLKEN = 4mA -- -- 0.4 V Thermal Throttling Thermal Throttling Threshold VOT Measure at NTC with respect to VCC -- 80 -- %VDD Thermal Throttling Threshold Hysteresis VOT_HY At VCC = 5V -- 100 -- mV VRTT Output Voltage VVRTT IVRTT = 40mA -- -- 0.4 V Current Monitor Current Monitor Maximum Output Voltage in Operating Range VDAC = 1V, VRCMSET = 90mV, RCM = 50kΩ, RCMSET = 10kΩ 0.855 0.9 0.945 V Current Monitor Maximum Output Voltage -- -- 1.15 V Gate Driver UGATE Driver Source RUGATEsr VBOOTx − VPHASEx = 5V VBOOTx − VUGATEx = 1V -- 0.7 -- Ω UGATE Driver Sink RUGATEsk VUGATE = 1V -- 0.6 -- Ω LGATE Driver Source RLGATEsr VPVCC = 5V, VPVCC − VLGATE = 1V -- 0.7 -- Ω LGATE Driver Sink RLGATEsk VLGATE = 1V -- 0.3 -- Ω UGATE Driver Source/Sink Current IUGATE VBOOT − VPHASE = 5V VUGATE = 2.5V -- 3 -- A LGATE Driver Source Current ILGATEsr VLGATE = 2.5V -- 3 -- A To be continued |
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