LT1339 Datasheet | Linear Technology

LT1339 High Power Synchronous DC/DC Controller Features s s DESCRIPTION The LT ®1339 is a high power synchronous current mode switching regulator controller. The IC drives dual N-channel MOSFETs to create a single IC solution for high power DC/DC converters in applications up to 60V. The LT1339 incorporates programmable average current limiting, allowing accurate limiting of DC load current independent of inductor ripple current. The IC also incorporates user-adjustable slope pensation for minimization of magnetics at duty cycles up to 90%. The LT1339 timing oscillator operating frequency is programmable and can be synchronized up to 150k Hz. Minimum off-time operation provides main switch protection. The IC also incorporates a soft start feature that is gated by both shutdown and undervoltage lockout conditions. An output phase reversal pin allows flexibility in configuration of converter types, including inverting and negative topologies. s s s s s s High Voltage: Operation Up to 60V High Current: Dual N-Channel Synchronous Drive Handles Up to 10,000p F Gate Capacitance Programmable Average Load Current Limiting 5V Reference Output with 10m A External Loading Capability Programmable Fixed Frequency Synchronizable Current Mode Operation Up to 150k Hz Undervoltage Lockout with Hysteresis Programmable Start Inhibit for Power Supply Sequencing and Protection Adaptive Nonoverlapping Gate Drive Prevents Shoot-Through U APPLICATIONS s s s s s s 48V Tele Power Supplies Personal puters and Peripherals Distributed Power Converters Industrial Control Systems Lead-Acid Battery Backup Systems Automotive and Heavy Equipment , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION 28V to 5V 20A Buck Converter DBST IN5819 SYNC 5VREF VBOOST VIN 28V + + RCT 10k CAVG CCT 2200p F 2200p F CSS, 1µF CVC, 1n F CT SL/ADJ LT1339 IAVG TG TS 12VIN BG PGND PHASE VC SGND VFB VREF RFB2 1k SENSE - RFB1 3k RUN/SHDN SENSE + + CBST 1µF D1...