LT1680 Datasheet | Linear Technology

LT1680 High Power DC/DC Step-Up Controller Features s s DESCRIPTION The LT ®1680 is a high power, current mode switching power supply controller optimized for boost topologies. The IC drives N-channel MOSFET switches for DC/DC converters in applications up to 60V input. A high current gate drive output handles up to 10,000p F gate capacitance, enabling the construction of high power DC/DC converters. Current sense mon mode range up to 60V allows current sensing to be referenced to the input supply, eliminating the need for sense blanking circuits. The LT1680 incorporates programmable average current limiting allowing accurate limiting of DC current in the magnetics, independent of ripple current . User adjustable slope pensation provides stable operation at duty cycles up to 90%. The LT1680 operating frequency is programmable and can be synchronized up to 200k Hz. Minimum off-time operation provides switch protection. The IC also incorporates a soft start feature that is gated by both shutdown and undervoltage lockout conditions. , LTC and LT are registered trademarks of Linear Technology Corporation. s s s s s s s High Voltage: Operation Up to 60V Max High Current: N-Channel Drive Handles Up to 10,000p F Gate Capacitance Programmable Average Current Limiting 5V Reference Output with 10m A External Loading Capability Fixed Frequency Current Mode Operation Oscillator Synchronizable Up to 200k Hz Undervoltage Lockout with Hysteresis Programmable Start Inhibit for Power Supply Sequencing and Protection User Adjustable Slope pensation U APPLICATIONS s s s s s High Power Single Board Systems Distributed Power Converters Industrial Control Systems Lead-Acid Battery Back-Up Systems Automotive and Heavy Equipment TYPICAL APPLICATION 12V to 48V, 250W Boost 12VIN 10V TO 15V 24A (DC) RSENSE 0.005Ω C2 1µF RCT 15k LT1680 1 2 C3 2.2n F C4 0.22µF CVC 4.7n F 1N914 RVC 4.7k 3 4 5 6 7 8 C6 0.1µF R7 2k SL/ADJ CT IAVG SS VC 5VREF SYNC 12VIN GATE PGND SENSE - 16 15 14 13 12...