Datasheet LTC3729 (Analog Devices) - 9

LTC3729
PIN FUNCTIONS G Package/UH Package EXTVCC (Pin 22/Pin 21):
External Power Input to an
VIN (Pin 24/Pin 23):
Main Supply Pin. Should be closely Internal Switch . This switch closes and supplies INTVCC, decoupled to the IC’s signal ground pin. bypassing the internal low dropout regulator whenever
CLKOUT (Pin 28/Pin 27):
Output Clock Signal available EXTVCC is higher than 4.7V. See EXTVCC Connection in to daisychain other controller ICs for additional MOSFET the Applications Information section. Do not exceed 7V driver stages/phases. on this pin and ensure VEXTVCC ≤ VINTVCC.
FUNCTIONAL DIAGRAM
PLLIN INTVCC VIN F PHASE DET IN 50k DUPLICATE FOR SECOND D BOOST B CONTROLLER CHANNEL PLLLPF RLP TG CB CLKOUT CLK1 DROP TOP + CLP OUT CIN OSCILLATOR CLK2 DET BOT FCB SW FORCE BOT S Q SWITCH PHASMD INTV R Q LOGIC CC PHASE LOGIC BG ±2µA BOT DIFFOUT PGND 40k 40k V – OS SHDN A1 INTVCC L – V + OS + I1 – SENSE+ 40k 40k – + 30k + 0.86V RSENSE 4(V C FB) SENSE– PGOOD 30k OUT – 0.86V + SLOPE + COMP 45k 45k EAIN VOUT – 2.4V + 0.74V EAIN R1 – EA 0.80V V V IN REF + 0.80V R2 VIN OV + 4.7V + 5V – 0.86V CC EXTV – ITH CC LDO REG 1.2µA SHDN RUN INTV R CC RST SOFT C 5V + 4(VFB) START 6V SGND INTERNAL RUN/SS SUPPLY CSS 3729 FBD 3729fb 9 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts