LTC3810-5 60V Current Mode Synchronous Switching Regulator Controller Fea T Descrip T n High Voltage Operation: Up to 60V The LTC 3810-5 is a synchronous step-down switching n Large 1 Gate Drivers regulator controller that can directly step-down voltages n No Current Sense Resistor Required from up to 60V, making it ideal for telecom and automo- n Dual N-Channel MOSFET Synchronous Drive tive applications. The LTC3810-5 uses a constant on-time n Extremely Fast Transient Response valley current control architecture to deliver very low duty n 0.5% 0.8V Voltage Reference cycles with accurate cycle-by-cycle current limit, without n Programmable Output Voltage Tracking/Soft-Start requiring a sense resistor. n Generates 5.5V Driver Supply from Input Supply A precise internal reference provides 0.5% DC accuracy. A n Synchronizable to External Clock high bandwidth (25MHz) error amplifier provides very fast n Selectable Pulse Skip Mode Operation line and load transient response. Large 1 gate drivers n Power Good Output Voltage Monitor allow the LTC3810-5 to drive multiple MOSFETs for higher n Adjustable On-Time/Frequency: t < 100ns ON(MIN) current applications. The operating frequency is selected n Adjustable Cycle-by-Cycle Current Limit by an external resistor and is compensated for variations n Programmable Undervoltage Lockout in V and can also be synchronized to an external clock IN n Output Overvoltage Protection for switching-noise sensitive applications. A shutdown n 5mm 5mm QFN Package pin allows the LTC3810-5 to be turned off, reducing the supply current to 240A. a T Integrated bias control generates gate drive power from n 48V Telecom and Base Station Power Supplies the input supply during start-up or when an output short- n Networking Equipment, Servers circuit occurs, with the addition of a small external SOT23 n Automotive and Industrial Control Systems MOSFET. When in regulation, power is derived from the L, LT, LTC, LTM, Linear Technology, the Linear logo and No R are registered trademarks SENSE output for higher efficiency. of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5847554, 6304066, 6476589, 6580258, 6677210, 6774611. Typical a T High Efficiency High Voltage Step-Down Converter Efficiency vs Load Current V 100 IN 13V TO 60V + 274k 100k 22F V = 24V IN I ON NDRV ZXMN10A07F 95 V = 42V IN PGOOD BOOST LTC3810-5 V RNG TG Si7450DP 10H 0.1F V OUT 90 MODE/SYNC SW 1000pF 12V/6A EXTV CC SS/TRACK DRV CC 14k SHDN INTV CC + 85 + MBR1100 270F 0 1 2 3 4 5 6 SENSE I TH 47pF LOAD CURRENT (A) 200k BG Si7450DP 38105 TA01b V FB SENSE 5pF SGND BGRTN 1F 1k 38105 TA01 38105fd 1 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3810-5 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW Supply Voltages INTV , DRV ...................................... 0.3V to 14V CC CC (DRV BGRTN), (BOOST SW) ........ 0.3V to 14V CC 32 31 30 29 28 27 26 25 BOOST (Continuous) .............................. 0.3V to 85V + NC 1 24 SENSE BOOST (400ms) .................................. 0.3V to 95V V 2 23 NC ON BGRTN ........................................................ 5V to 0V V 3 22 NC RNG EXTV .................................................. 0.3V to 15V CC PGOOD 4 21 NC 33 (EXTV INTV ) ..................................12V to 12V MODE/SYNC 5 20 SENSE CC CC I BGRTN (NDRV INTV ) Voltage .......................... 0.3V to 10V 6 19 TH CC + V 7 18 BG FB SW, SENSE Voltage (Continuous) .................1V to 70V + PLL/LPF 8 17 DRV CC SW, SENSE Voltage (400ms) ........................1V to 80V 9 10 11 12 13 14 15 16 I Voltage (Continuous) ............................ 0.3V to 70V ON I Voltage (400ms) ................................... 0.3V to 80V ON SS/TRACK Voltage ....................................... 0.3V to 5V UH PACKAGE PGOOD Voltage ............................................ 0.3V to 7V 32-LEAD (5mm 5mm) PLASTIC QFN V , V , MODE/SYNC, SHDN, RNG ON T = 125C, = 34C/W JMAX JA EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB UVIN Voltages ............................................ 0.3V to 14V PLL/LPF, FB Voltages ................................ 0.3V to 2.7V TG, BG, INTV , EXTV RMS Currents ................50mA CC CC Operating Junction Temperature Range (Notes 2, 3, 7) LTC3810E-5 ....................................... 40C to 125C LTC3810I-5 ........................................ 40C to 125C LTC3810H-5 ....................................... 40C to 150C Storage Temperature Range .................. 65C to 125C o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3810EUH-5 PBF LTC3810EUH-5 TRPBF 38105 40C to 125C 32-Lead (5mm 5mm) Plastic QFN LTC3810IUH-5 PBF LTC3810IUH-5 TRPBF 38105 40C to 125C 32-Lead (5mm 5mm) Plastic QFN LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3810EUH-5 LTC3810EUH-5 TR 38105 40C to 125C 32-Lead (5mm 5mm) Plastic QFN LTC3810IUH-5 LTC3810IUH-5 TR 38105 40C to 125C 32-Lead (5mm 5mm) Plastic QFN LTC3810HUH-5 LTC3810HUH-5 TR 38105 32-Lead (5mm 5mm) Plastic QFN 40C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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