LTC7803 PIN FUNCTIONS (MSOP/QFN)TG(Pin 15/Pin 1): High Current Gate Drive for the Top GND (Exposed Pad Pin 17/Exposed Pad Pin 17): Ground. N-Channel MOSFET. This is the output of floating driver Connects to the source of the bottom (main) N-channel with a voltage swing of INTVCC superimposed on the MOSFET and the (–) terminal(s) of CIN and COUT. All switch node voltage SW. small-signal components and compensation components SW(Pin 16/Pin 2): Switch Node Connection to the should also connect to this ground. The exposed pad must Inductor. be soldered to the PCB for rated thermal performance. FUNCTIONAL DIAGRAM INTVCC V D IN BOOST B CHARGE PUMP CB DROP TG TOP OUT C FREQ IN DET SPREAD SPECTRUM SW TOP ON PLLIN/SPREAD OSCILLATOR S Q AND PLL INTV R Q CC SWITCH SHDN BG LOGIC BOT + RUN 1.2V – + L R MODE 0.425V SENSE SLEEP V – OUT COUT 100k ICMP IR – + + – – + + – 2mV SENSE+ V 2.7V IN 0.65V SENSE– EXTVCC SLOPE COMP VFB 5.15V 5.15V + RB LDO LDO EA – 0.80V TRACK/SS RA EN EN + + OV – 4.7V – 0.88V ITH RC GND INTVCC SHDN CC2 C 12.5µA C RST FOLDBACK TRACK/SS 2(VFB) SHDN CSS 7803 FD Rev 0 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Typical Application Related Parts
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