LT3840 pin FuncTions (TSSOP/QFN)TG (Pin 22/Pin 25): TG is the high current gate drive for INTVCC (Pin 26/Pin 30): INTVCC is the auxiliary bias supply the top N-channel MOSFET. output. Bypass the pin with a low ESR capacitor placed BOOST (Pin 23/Pin 26): BOOST is the supply for the close to the pin. INTVCC provides supply for LT3840 internal bootstrapped TG gate drive and is externally connected bias and MOSFET gate drivers. The INTVCC pin cannot be to a low ESR ceramic capacitor referenced to SW. back driven with a separate supply. BGRTN (Pin 24/Pin 28): BGRTN is the high current return AUXSW2 (Pin 27/Pin 33): AUXSW2 is a switching node path of the BG MOSFET driver and is externally connected of the auxiliary supply and is connected to the auxiliary to the negative terminal of the INTV bias supply inductor. CC capacitor. BG (Pin 25/Pin 29): BG is the high current gate drive for AUXBST (Pin 28/Pin 35): AUXBST provides drive voltage for the auxiliary supply and is connected to a low ESR the bottom N-channel MOSFET. capacitor referenced to AUXSW1. 3840fa 8 For more information www.linear.com/LT3840 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
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