Transcription of Dual-Channel Synchronous DC/DC Step-Down Controller with ...
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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). Other features include on-board power-upsequencing, a power-good output, internal soft-start, andsoft-discharge output that prevents negative voltage constant current ripple PWM control scheme operateswithout sense resistors and provides 100ns response toload transient.
7 PGOOD Power Good Indicator Output for Channel 1 and Channel 2. (Logical AND) 8 PHASE2 Switch Node of Channel 2 MOSFETs. PHASE2 is the internal lower supply rail for the UGATE2 high-side gate driver. PHASE2 is also the current-sense input for the Channel 2. 9 BOOT2 Bootstrap Supply for Channel 2 High-Side Gate Driver. Connect to an external
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