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RT9643 Datasheet(PDF) 9 Page - Richtek Technology Corporation |
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RT9643 Datasheet(HTML) 9 Page - Richtek Technology Corporation |
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9 / 17 page  RT9643 9 DS9643-03 August 2007 www.richtek.com To be continued Parameter Symbol Test Condition Min Typ Max Units Oscillator Frequency FOSC 250 300 350 kHz Ramp Amplitude pk-pk -- 1.8 -- V Ramp offset -- 0.5 -- V Reference and Soft Start Internal Reference voltage 0.891 0.900 0.909 V Initial ramp after power-up -- 5 -- μA Soft Start Current During PWM/LOD soft start -- 48 -- μA SS discharge on resistance EN = 0 -- 280 -- Ω PWM Converter Load Regulation IOUT from 0 to 16A -2 -- +2 % FB Bias Current 0.75 1 1.25 μA Under Voltage shutdown 2us noise filter 65 75 80 % Isns over-current threshold RILIM 145 170 195 μA Over voltage threshold 110 115 120 % PWM Output Driver Sourcing -- 1.8 3 Ω UGATE Output Resistance Sinking -- 1.8 3 Ω Sourcing - 1.8 3 Ω LGATE Output Resistance Sinking -- 1.2 2 Ω PGOOD (Power good Output) and control pins, VDDQ output Lower threshold 2us noise filter 86 -- 92 % Upper threshold 2us noise filter 108 -- 115 % PGOOD Output Low IPGOOD -- -- 0.5 V Leakage Current Pull up to 5V -- -- 1 μA VTT Regulator VDDQ IN Current S0 mode, IVTT = 0 -- 35 70 mA IVTT = 0, TA = 25°C -20 -- 20 mV VREF IN to VTT Differential Output Voltage IVTT = ±1.25A (pulsed) -40 -- 40 mV Internal Divider Gain EN=0 0.493 0.498 0.503 V/V VTT Current Limit Pulse(300ms MAX), TA = 25°C ±1.5 ±3 ±4 A VTT Leakage Current S3#I = Low −20 -- 20 μA VTT SNS input resistance VTT = 0.9V -- 110 -- kΩ VTT PGOOD Measured at VTT SNS 80 -- 110 % Drop-Out Voltage ITT = ±1.5A -0.8 -- 0.8 V |
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