Transcription of Dual-Channel Synchronous DC/DC Step-Down Controller …
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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).
Current Limit The current limit circuit employs a unique “valley” current sensing algorithm. If the magnitude of the current sense signal at PHASE is above the current limit threshold, the PWM is not allowed to initiate a new cycle. Thus, the current to the load exceeds the average output inductor current, the output voltage falls and ...
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