High Power Synchronous DC DC Controller
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20
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1LT1339 sn1339 1339fas High Power Synchronous DC/DC Controller DESCRIPTION U 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. n High Voltage: Operation Up to 60V n High Current: Dual N-Channel Synchronous Drive Handles Up to 10,000pF Gate Capacitance n Programmable Average Load Current Limiting n 5V Reference Output with 10mA External Loading Capability n Programmable Fixed Frequency Synchronizable Current Mode Operation Up to 150kHz n Undervoltage Lockout with Hysteresis n Programmable Start Inhibit for Power Supply Sequencing and Protection n Adaptive Nonoverlapping Gate Drive Prevents Shoot-Through n 48V Telecom Power Supplies n Personal Computers and Peripherals n Distributed Power Converters n Industrial Control Systems n Lead-Acid Battery Backup Systems n Automotive and Heavy
Voir
- lockout threshold - rising
- supply current
- up pl
- bottom gate
- fall time
- operation up
- limit threshold
- voltage line
- dc standby
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FEATURESnHigh Voltage: Operation Up to 60VnHigh Current: Dual N-Channel Synchronous DriveHandles Up to 10,000pF Gate CapacitancenProgrammable Average Load Current Limitingn5V Reference Output with 10mA ExternalLoading CapabilitynProgrammable Fixed Frequency SynchronizableCurrent Mode Operation Up to 150kHznUndervoltage Lockout with HysteresisnProgrammable Start Inhibit for Power SupplySequencing and ProtectionnAdaptive Nonoverlapping Gate Drive PreventsShoot-ThroughAPPLICATIONSn48V Telecom Power SuppliesnPersonal Computers and PeripheralsnDistributed Power ConvertersnIndustrial Control SystemsnLead-Acid Battery Backup SystemsnAutomotive and Heavy Equipment
TYPICAL APPLICATION28V to 5V 20A Buck ConverterDBSTIN5819SYNC VBOOSTCBST5VREF1µFRCTTGD110kC5VREFMBR05201µF CT TSCCTCAVGSL/ADJ 12VIN2200pF 2200pF LT1339 BGIAVGD2CSS,1µF SS PGND MBR0520 10k PHASECVC,1nF RVC,VCRUN/SHDN1R0R0UkNCEFSGND SENSE+R0.1µFVFBVREFSENSE–RFB2RFB11k 3kL1 = CTX02-13400-X2
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT1339High Power SynchronousDC/DC ControllerDESCRIPTIONThe LT®1339 is a high power synchronous current modeswitching regulator controller. The IC drives dualN-channel MOSFETs to create a single IC solution for highpower DC/DC converters in applications up to 60V.The LT1339 incorporates programmable average currentlimiting, allowing accurate limiting of DC load currentindependent 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 byboth shutdown and undervoltage lockout conditions.An output phase reversal pin allows flexibility in configu-ration of converter types, including inverting and negativetopologies.
a510TA0309081510
LT1339ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO(Note 1)Supply VoltagesTOP VIEWORNDUEMR BPEARRTPower Supply Voltage (12VIN)...............–0.3V to 20VSYNC 1 20 VBOOSTTopside Supply Voltage (VBOOST)5VREF2 19 TGVTS – 0.3V to VTS + 20V (VMAX = 75V)CT 3 18 TSLT1339CNTopside Reference Pin Voltage (TS) ......–0.3V to 60VSL/ADJ 4 17 12VINLT1339CSWInput VoltagesIAVG5 16 BGLT1339INSense Amplifier Input Common Mode...–0.3V to 60VSS 6 15 PGNDLT1339ISWRUN/SHDN Pin Voltage ...................... –0.3V to 12VINVC7 14 PHASEAll Other Inputs .................................. –0.3V to 7VSGND 8 13 RUN/SHDN.....Maximum CurrentsVFB9 12 SENSE–5V Reference Output Current............................ 65mAVREF10 11 SENSE+Maximum TemperaturesN PACKAGE SW PACKAGEOperating Ambient Temperature Range20-LEAD PDIP 20-LEAD PLASTIC SO WIDE∞LT1339C.......................................................................... .–..4 00∞CC ttoo 7805∞∞CCTJTJMMAXA X= =1 12255∞∞C,C ,Κ JΚAJ A= =8 750∞∞CC//WW ( (SNW))LT1339I ........Storage Temperature Range ................. –65∞C to 150∞CLead Temperature (Soldering, 10 sec).................. 300∞CConsult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS12VIN = VBOOST = 12V, VC = 2V, TS = 0V, VFB = VREF = 1.25V, CTG = CBG = 3000pF, TA = 25∞C unless otherwise noted.SYMBOL PARAMETER CONDITIONS MIN TYPSupply and ProtectionI12VINDC Active Supply Current (Note 2)l14DC Standby Supply Current VRUN/SHDN < 0.5Vl150IBOOSTDC Active Supply Current (Note 2) 2.2DC Standby Supply Current VRUN/SHDN < 0.5V 0VRUN/SHDNShutdown Rising Thresholdl1.15 1.25VSSHYSTShutdown Threshold Hysteresis 25ISSSoft Start Charge Currentl4 8VUVLOUndervoltage Lockout Threshold - Fallingl8.20 9.00Undervoltage Lockout Threshold - Risingl9.35Undervoltage Lockout Hysteresisl200 3505V ReferenceVREF55V Reference Voltagel4.75 5.005V Reference Line Regulationl3IREF55V Reference Load Range - DClPulsel5V Reference Load Regulationl–1.25ISC5V Reference Short-Circuit Current 45
2
Line, Load and Temperature10Vσ 12VIN σ 15V0σ IREF5 σ 20mA
MAX UNITS20 mA250mAmAmA1.35 VmV14mA9.75 V9.95 VmV5.25 V5 mV/V10 mA20 mA– 2 V/AmA
sn1339 1339fas
