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RT8249 Datasheet(PDF) 7 Page - Richtek Technology Corporation |
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RT8249 Datasheet(HTML) 7 Page - Richtek Technology Corporation |
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7 / 23 page  RT8249A/B/C 7 DS8249A/B/C-02 June 2014 www.richtek.com © Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Parameter Symbol Test Conditions Min Typ Max Unit Buck Controllers Output and FB Voltage FBx Valley Trip Voltage VFBx CCM Operation 1.98 2 2.02 V BYP1 Discharge Current IDCHG_BYP1 VBYP1 = 0.5V 10 45 -- mA PHASEx Discharge Current IDCHG_LX VPHASEx = 0.5V 5 8 -- mA Switching Frequency Switching Frequency fSWx RT8249A/B, VIN = 20V, VOUT1 = 5V 320 400 480 kHz RT8249A/B, VIN = 20V, VOUT2 = 3.33V 380 475 570 RT8249C, VIN = 20V, VOUT1 = 5V 400 500 600 RT8249C, VIN = 20V, VOUT2 = 3.33V 480 600 720 Minimum Off-Time tOFF(MIN) VFBx = 1.9V -- 200 275 ns Soft-Start Soft-Start Time tSSx VOUT Ramp_Up Time -- 0.9 -- ms Current Sense CSx Source Current ICSx VCSx = 1V 47 50 53 A CSx Current Temperature Coefficient TCICSx In Comparison with 25°C -- 4700 -- ppm/ C Zero-Current Threshold VZC VFBx = 2.05V, GND PHASEx -- 1 -- mV Internal Regulator LDO5 Output Voltage VLDO5 VIN = 12V, No Load 4.9 5 5.1 V VIN > 7V, ILDO5 < 100mA 4.8 5 5.1 VIN > 5.5V, ILDO5 < 35mA 4.8 5 5.1 VIN > 5V, ILDO5 < 20mA 4.5 4.75 5.1 LDO3 Output Voltage VLDO3 VIN = 12V, No Load 3.267 3.3 3.333 V VIN > 7V, ILDO3 < 100mA 3.217 3.3 3.383 VIN > 5.5V, ILDO3 < 35mA 3.267 3.3 3.333 VIN > 5V, ILDO3 < 20mA 3.217 3.3 3.383 LDO5 Output Current ILDO5 VLDO5 = 4.5V, VBYP1 = GND, VIN = 7.4V 100 175 -- mA LDO3 Output Current ILDO3 VLDO3 = 3V, VIN = 7.4V 100 175 -- mA LDO5 Switch-over Threshold to BYP1 VSWTH Rising Edge at BYP1 Regulation Point -- 4.66 -- V LDO5 Switch-over Equivalent Resistance RSW LDO5 to BYP1, 10mA -- 1.5 3 VCLK Output, RT8249A/B VCLK On-Resistance RVCLK Pull-up and Pull-down Resistance -- 10 -- VCLK Switching Frequency fVCLK -- 260 -- kHz |
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