LTC3814-5 60V Current Mode Synchronous Step-Up Controller FEATURES DESCRIPTION The LTC3814-5 is a synchronous step-up switching regu- n High Output Voltages: Up to 60V lator controller that can generate output voltages up to n Large 1 Gate Drivers 60V. The LTC3814-5 uses a constant off-time peak current n No Current Sense Resistor Required control architecture to deliver very high duty cycles with n Dual N-Channel MOSFET Synchronous Drive accurate cycle-by-cycle current limit without requiring a n 0.5% 0.8V Voltage Reference sense resistor. n Fast Transient Response n Programmable Soft-Start A precise internal reference provides 0.5% DC accuracy. n Generates 5.5V Driver Supply A high bandwidth (25MHz) error ampli er provides very n Power Good Output Voltage Monitor fast line and load transient response. Large 1 gate driv- n Adjustable Off-Time/Frequency: t < 100ns ers allow the LTC3814-5 to drive large power MOSFETs OFF(MIN) n Adjustable Cycle-by-Cycle Current Limit for higher current applications. The operating frequency n Undervoltage Lockout On Driver Supply is selected by an external resistor and is compensated for n Output Overvoltage Protection variations in V . A shutdown pin allows the LTC3814-5 IN n Thermally Enhanced 16-Pin TSSOP Package to be turned off reducing the supply current to <230A. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No R SENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their APPLICATIONS respective owners. Protected by U.S. Patents including 5481178, 5847554, 6304066, 6476589, 6580258, 6677210, 6774611. n 24V Fan Supplies n 48V Telecom and Base Station Power Supplies n Networking Equipment, Servers n Automotive and Industrial Control Systems TYPICAL APPLICATION High Ef ciency High Voltage Step-Up Converter Ef ciency vs Load Current 100 263k V = 12V V IN V IN OUT I NDRV OFF 4.5V TO 14V 100k + 95 22F BOOST PGOOD 4.7H PGOOD LTC3814-5 V TG RNG M1 V = 5V 90 IN 0.1F V Si7848DP OUT V OFF 24V SW 4A EXTV RUN/SS CC INTV CC 85 1000pF D1 I TH 29.4k MBR1100 0.01F M2 + BG 270F 100k Si7848DP 2 V 80 FB PGND SGND 2 3 0 1 4 100pF 1F LOAD (A) 1k 38145 TA01b 38145 TA01 38145fc 1 EFFICIENCY (%)LTC3814-5 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) Supply Voltages TOP VIEW INTV ................................................... 0.3V to 14V CC I 1 16 BOOST OFF (INTV PGND), (BOOST SW) ......... 0.3V to 14V CC V 2 15 TG OFF BOOST (Continuous) ............................. 0.3V to 85V V 3 14 SW RNG BOOST (400ms) .................................. 0.3V to 95V PGOOD 4 13 PGND 17 EXTV .................................................. 0.3V to 15V CC I 5 12 BG TH (EXTV INTV ) .................................. 12V to 12V CC CC V 6 11 INTV FB CC (NDRV INTV ) Voltage ........................... 0.3V to 10V CC RUN/SS 7 10 EXTV CC SW Voltage (Continuous) .............................. 1V to 70V SGND 8 9 NDRV SW Voltage (400ms) ..................................... 1V to 80V FE PACKAGE I Voltage (Continuous) .......................... 0.3V to 70V 16-LEAD PLASTIC TSSOP OFF T = 125C, = 38C/W JMAX JA I Voltage (400ms) ................................. 0.3V to 80V OFF EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB RUN/SS Voltage ........................................... 0.3V to 5V PGOOD Voltage ............................................ 0.3V to 7V V , V Voltages ................................... 0.3V to 14V RNG OFF FB Voltage ................................................. 0.3V to 2.7V TG, BG, INTV , EXTV RMS Currents .................50mA CC CC Operating Junction Temperature Range (Notes 2, 3, 7) ....................................... 40C to 125C Storage Temperature Range ................... 65C to 150C Lead Temperature (Soldering, 10 sec) .................. 300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3814EFE-5 PBF LTC3814EFE-5 TRPBF 3814EFE-5 16-Lead Plastic TSSOP 40C to 125C LTC3814IFE-5 PBF LTC3814IFE-5 TRPBF 3814IFE-5 16-Lead Plastic TSSOP 40C to 125C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: