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Dual-Channel Synchronous DC/DC Step-Down Controller with ...

RT8249A/B/C DS8249A/B/C-02 June 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Simplified Application CircuitGeneral DescriptionThe RT8249A/B/C is a Dual-Channel Step-Down , controllergenerating supply voltages for battery-powered includes two Pulse-Width Modulation (PWM) controllersadjustable from 2V to , and two fixed 5 linearregulators. Each linear regulator provides up to 100mAoutput current and linear regulator provides 1%accuracy under 35mA. The RT8249A/B has an oscillatoroutput to driver the external charge pump application. TheRT8249C provides a mode selection pin, SKIPSEL, toselect Diode-Emulation Mode (DEM) or Audio SkippingMode (ASM).

Channel 2. 9 BOOT2 Bootstrap Supply for Channel 2 High-Side Gate Driver. Connect to an external capacitor according to the typical application circuits. 10 UGATE2 High-Side Gate Driver Output for Channel 2. UGATE2 swings between PHASE2 and BOOT2. 11 LGATE2 Low-Side Gate Driver Output for Channel 2. LGATE2 swings between GND and LDO5.

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