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RT9228 Datasheet(PDF) 4 Page - Richtek Technology Corporation |
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RT9228 Datasheet(HTML) 4 Page - Richtek Technology Corporation |
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RT9228 4 DS9228-06 March 2007 www.richtek.com Parameter Symbol Test Conditions Min Typ Max Units Reference and DAC DAC (VID0-VID4) Input Low Voltage -- -- 0.8 V DAC (VID0-VID4) Input High Voltage 2.0 -- -- V DACOUT Voltage Accuracy DACOUT = 2.05 ~ 3.50V -1 -- 1 % DACOUT Voltage Accuracy DACOUT = 1.30 ~ 2.00V -1% -- 20mV - Reference Voltage (Pin FB2 and FB3) VREF 1.240 1.265 1.290 V Linear Regulator Regulation 10mA < IVOUT2 < 150mA -2.5 -- 2.5 % Under-voltage Level FB2 Rising -- 75 87 % Under-voltage Hysteresis -- 100 -- mV Over-current Protection IOVP 180 230 -- mA Over-current Protection During Start-up -- 700 -- mA Linear Controller Regulation VSEN3 = GATE3 0 < IGATE3 < 20mA -2.5 -- 2.5 % Under-voltage Level FB3 Rising -- 75 87 % Under-voltage Hysteresis -- 100 -- mV Output Drive Current VIN2 – VOUT3 > 1.5V 20 40 -- mA PWM Controller Error Amplifier DC Gain -- 65 -- dB PWM Controller Gate Driver UGATE Source RUGATE1 VCC = 12V VCC - VUGATE1 = 1V -- 3 7 Ω UGATE Sink RUGATE1 VUGATE1 = 1V -- 3 7 Ω LGATE Source ILGATE1 VCC = 12V VLGATE1 = 2V -- 1 -- A LGATE Sink RLGATE1 VLGATE1 = 1V -- 2 6 Ω Protection VOUT1 Over-voltage Trip VSEN1 Rising 112 115 120 % FAULT Souring Current IOVP VFAULT = 8V 10 14 -- mA OCSET1 Current Source IOCSET VOCSET1 = 4.5V 170 200 230 μA Soft-start Current ISS VSS = 1V -- 11 -- μA Power Good VOUT1 Upper Threshold VSEN1 Rising 108 -- 112 % VOUT1 Under Voltage VSEN1 Rising 89 -- 95 % VOUT1 Hysteresis (VSEN1/DACOUT) Upper/Lower Threshold -- 2 -- % PGOOD Voltage Low VPGOOD IPGOOD = -4mA -- -- 0.5 V |
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