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RT8206M Datasheet(PDF) 26 Page - Richtek Technology Corporation |
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RT8206M Datasheet(HTML) 26 Page - Richtek Technology Corporation |
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26 / 27 page  RT8206L/M 26 DS8206L/M-07 June 2012 www.richtek.com © Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Table 2. Operation Mode Truth Table Mode Condition Comment Power Up PVCC < UVLO threshold Transitions to discharge mode after VIN POR and REF become valid. LDO and REF remain active. RUN ENLDO = high, EN1 or EN2 enabled Normal Operation. Over voltage Protection Either output > 112% of nominal level. LGATEx is forced high. LDO and REF active. Exited by VIN POR or by toggling ENLDO, ENx. Under voltage Protection Either output < 55% of nominal level after 3ms time-out expires and output is enabled. Both UGATEx and LGATEx are forced low until discharge mode terminates. LDO and REF are active. Exited by VIN POR or by toggling ENLDO, EN1, or EN2. Discharge Either SMPS output is still high in either standby mode or shutdown mode. During discharge mode, the output capacitor discharges to GND through an internal N-MOSFET switch. Standby ENx < startup threshold, ENLDO = high. LGATEx stays low. LDO and REF active. Shutdown EN1, EN2, ENLDO=low All circuitry off. Thermal Shutdown TJ > +150°C All circuitry off. Exit by VIN POR or by toggling ENLDO, ENx. Table 3. Power Up Sequencing ENLDO (V) VEN1 (V) VEN2 (V) LDO 5V SMPS1 3V SMPS2 Low X X Off Off Off “>2V” High Low Low On (after REF powers up) Off Off “>2V” High Low REF On (after REF powers up) Off Off “>2V” High Low High On (after REF powers up) Off On “>2V” High REF Low On (after REF powers up) Off Off “>2V” High REF REF On (after REF powers up) Off Off “>2V” High REF High On (after REF powers up) On (after SMPS2 on) On “>2V” High High Low On (after REF powers up) On Off “>2V” High High REF On (after REF powers up) On On (after SMPS1 on) “>2V” High High High On (after REF powers up) On On |
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