Datasheet LTC3778 (Analog Devices) - 8

LTC3778
U U W FU CTIO AL DIAGRA
R V ON OUT VIN 2 VON 8 ION 6 FCB 10 EXTVCC 11 VIN 4.7V 0.7V 2.4V + CIN 1µA + – 0.6V REF 0.6V 5V REG – + INTVCC 12 F BOOST 20 VVON tON = (10pF) R IION TG CB S Q FCNT 19 M1 SW ON 20k 18 + + SENSE+ D L1 SWITCH B ICMP IREV LOGIC 17 VOUT – – SENSE– 16 SHDN DRV + CC 1.4V 13 COUT BG OV VRNG 14 M2 4 × CVCC RSENSE (0.5~2) (OPTIONAL)* PGND 0.7V 15 3 3.3µA PGOOD R2 1 240k 1V + 0.54V Q2 Q4 UV Q6 – ITHB VFB 9 Q3 Q1 R1 + Q5 SGND OV 7 + 0.8V – – 0.66V RUN SS SHDN/ – + LATCH-OFF SW 1.2µA ×5.3 EA SENSE+ + – – + BG M2 0.6V 6V SENSE– 0.6V 5 I C TH C1 1 RUN/SS CSS PGND R 0.4V C *CONNECTION W/O SENSE RESISTOR 1778 FD 3778f 8