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LT1339CN Datasheet(PDF) 1 Page - Linear Technology |
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LT1339CN Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page 1 LT1339 High Power Synchronous DC/DC Controller DESCRIPTION FEATURES 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 incor- porates user-adjustable slope compensation for minimi- zation of magnetics at duty cycles up to 90%. The LT1339 timing oscillator operating frequency is pro- grammable and can be synchronized up to 150kHz. Mini- mum 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 configu- ration of converter types, including inverting and negative topologies. s High Voltage: Operation Up to 60V s High Current: Dual N-Channel Synchronous Drive Handles Up to 10,000pF Gate Capacitance s Programmable Average Load Current Limiting s 5V Reference Output with 10mA External Loading Capability s Programmable Fixed Frequency Synchronizable Current Mode Operation Up to 150kHz s Undervoltage Lockout with Hysteresis s Programmable Start Inhibit for Power Supply Sequencing and Protection s Adaptive Nonoverlapping Gate Drive Prevents Shoot-Through s 48V Telecom Power Supplies s Personal Computers and Peripherals s Distributed Power Converters s Industrial Control Systems s Lead-Acid Battery Backup Systems s Automotive and Heavy Equipment APPLICATIONS TYPICAL APPLICATION , LTC and LT are registered trademarks of Linear Technology Corporation. 28V to 5V 20A Buck Converter SYNC VBOOST 5VREF TG CT TS SL/ADJ 12VIN IAVG BG SS PGND VC PHASE SGND RUN/SHDN VFB SENSE+ VREF SENSE– DBST IN5819 12V VIN 28V CIN 1500 µF 63V × 3 IRL3803 IRL3103D2 × 2 L1 10 µH VOUT 5V AT 20A RFB2 1k RFB1 3k LT1339 + CBST 1 µF + C12VIN 47 µF + COUT 2200 µF 6.3V × 2 + D2 MBR0520 D1 MBR0520 RRUN 100k RS 0.005 Ω RCT 10k CCT 2200pF CAVG 2200pF CSS, 1µF CVC, 1nF RVC, 10k CREF 0.1 µF 1339 TA03 L1 = CTX02-13400-X2 C5VREF 1 µF + + 28V to 5V Efficiency OUTPUT CURRENT (A) 0 20 1339 TA03a 5 10 15 100 90 80 70 60 50 |
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