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RT8249 Datasheet(PDF) 1 Page - Richtek Technology Corporation |
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RT8249 Datasheet(HTML) 1 Page - Richtek Technology Corporation |
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1 / 23 page  RT8249A/B/C ® DS8249A/B/C-02 June 2014 www.richtek.com 1 Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. © Simplified Application Circuit General Description The RT8249A/B/C is a dual-channel step-down, controller generating supply voltages for battery-powered systems. It includes two Pulse-Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and two fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current and 3.3V linear regulator provides 1% accuracy under 35mA. The RT8249A/B has an oscillator output to driver the external charge pump application. The RT8249C provides a mode selection pin, SKIPSEL, to select Diode-Emulation Mode (DEM) or Audio Skipping Mode (ASM). Other features include on-board power-up sequencing, a power-good output, internal soft-start, and soft-discharge output that prevents negative voltage during shutdown. A constant current ripple PWM control scheme operates without sense resistors and provides 100ns response to load transient. For maximizing power efficiency, the RT8249A/B/C automatically switches to the diode- emulation mode in light load applications. The RT8249A/ B/C is available in the WQFN-20L 3x3 package. Features Support Connected Standby Mode for Ultrabook CCRCOT Control with 100ns Load Step Response PWM Maximum Duty Ratio > 98% 5V to 25V Input Voltage Range 2V to 5.5V Output Voltage Range 5V/3.3V LDOs with 100mA Output Current 1% Accuracy on 3.3V LDO Output Oscillator Driving Output for Charge Pump Application Internal Frequency Setting RT8249A/B : 400kHz/475kHz (CH1/CH2) RT8249C : 500kHz/600kHz (CH1/CH2) Internal Soft-Start and Soft-Discharge 4700ppm/ °°°°°C RDS(ON) Current Sensing Independent Switcher Enable Control Built in OVP/UVP/OCP/OTP Non-latch UVLO Power Good Indicator 20-Lead WQFN Package RoHS Compliant and Halogen Free Dual-Channel Synchronous DC/DC Step-Down Controller with 5V/3.3V LDOs RT8249A/B/C PHASE1 LGATE1 BOOT1 UGATE1 VIN PHASE2 LGATE2 BOOT2 UGATE2 FB2 VIN BYP1 FB1 PGOOD LDO3 EN1 3.3V VOUT2 VOUT1 Channel 1 Enable EN2 Channel 2 Enable LDO5 5V PGOOD Indicator CS1 CS2 GND Off On |
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