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RT8239B Datasheet(PDF) 8 Page - Richtek Technology Corporation |
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RT8239B Datasheet(HTML) 8 Page - Richtek Technology Corporation |
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8 / 24 page  RT8239A/B/C 8 DS8239A/B/C-06 October 2012 www.richtek.com © Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Parameter Symbol Test Conditions Min Typ Max Unit Output Voltage Adjustable Range SMPS1, SMPS2 2 -- 5.5 SECFB Voltage VSECFB RT8239B 1.92 2 2.08 V On-Time VPHASE1 = 2V -- 256 -- On-Time Pulse Width tUGATEx VIN = 20V RTON = 56kΩ VPHASE2 = 2V -- 220 -- ns Minimum Off-Time tLGATEx VFBx = 1.8V -- -- 400 ns fSMPS1 SMPS1 Operating Frequency 200 -- 400 Frequency Range fSMPS2 SMPS2 Operating Frequency 233 -- 466 kHz Ultrasonic Mode Frequency fASM RT8239C, VPHASEx = 50mV 25 -- -- kHz Soft-Start Soft-Start Time tSSx Zero to 200mV Current Limit Threshold from ENTRIPx Enable -- 2 -- ms Current Sense Current Limit Current Source IENTRIPx VENTRIPx = 0.9V 9.4 10 10.6 μA Temperature Coefficient of IENTRIPx On The Basis of 25 °C -- 4700 -- ppm/ °C Current Limit Adjustment Range VENTRIPx = IENTRIPx x RENTRIPx 0.5 -- 2.7 V Current Limit Threshold VENTRIPx GND − PHASEx, VENTRIPx = 2V 180 200 225 mV Zero-Current Threshold VZC GND − PHASEx, FBx = 2.1V -- 3 -- mV Internal Regulator and Reference VBYP1 = 0V, ILDO5 < 100mA 4.8 5 5.2 VBYP1 = 0V, ILDO5 < 100mA , 6.5V < VIN < 25V 4.75 -- 5.25 LDO5 Output Voltage VLDO5 VBYP1 = 0V, ILDO5 < 50mA, 5.5V < VIN < 25V 4.75 -- 5.25 V LDO5 Output Current ISHORT5 VBYP1 = 0V, VLDO5 = 4.5V -- 225 -- mA 5V Switchover Threshold VBYP1TH Falling Edge, Rising Edge with FB1 Regulation Point 4.53 4.66 4.79 V 5V Switch RDS(ON) RBYPSW VBYP1 = 5V, ILDO5 = 50mA -- 1.5 3 Ω VBYP1 = 0V, ILDO3 < 100mA 3.2 3.3 3.46 V LDO3 Output Voltage VLDO3 VBYP1 = 5V, ILDO3 < 100mA 3.2 3.3 3.46 LDO3 Output Current ISHORT3 VBYP1 = 0V, VLDO3 = 2.9V -- 150 -- mA UVLO Rising Edge -- 4.35 4.5 LDO5 UVLO Threshold VUVLO5 Falling Edge 3.9 4.05 4.2 V LDO3 UVLO Threshold VUVLO3 Both SMPS Off -- 2.2 -- Power Good PGOOD Threshold VPGOOD PGOOD Detect, Rising edge with soft-start delay time. Hysteresis = 2.5% −14 −10 −6 % PGOOD Propagation Delay tPD_PGOOD Falling Edge -- 5 -- μs |
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