LTC3703 100V Synchronous Switching Regulator Controller Fea T Descrip T n High Voltage Operation: Up to 100V The LTC 3703 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 100V, making it ideal for telecom and automo- n Step-Up or Step-Down DC/DC Converter tive applications. The LTC3703 drives external N-channel n Dual N-Channel MOSFET Synchronous Drive MOSFETs using a constant frequency (up to 600kHz), n Excellent Line and Load Transient Response voltage mode architecture. n Programmable Constant Frequency: 100kHz to A precise internal reference provides 1% DC accuracy. 600kHz A high bandwidth error amplifier and patented line feed- n 1% Reference Accuracy forward compensation provide very fast line and load n Synchronizable up to 600kHz transient response. Strong 1 gate drivers allow the n Selectable Pulse-Skip Mode Operation LTC3703 to drive multiple MOSFETs for higher current ap- n Low Shutdown Current: 50A Typ plications. The operating frequency is user programmable n Programmable Current Limit from 100kHz to 600kHz and can also be synchronized to n Undervoltage Lockout an external clock for noise-sensitive applications. Cur- n Programmable Soft-Start rent limit is programmable with an external resistor and n 16-Pin Narrow SSOP and 28-Pin SSOP Packages utilizes the voltage drop across the synchronous MOSFET to eliminate the need for a current sense resistor. For ap- a T plications requiring up to 60V operation with logic-level n 48V Telecom and Base Station Power Supplies MOSFETS, refer to the LTC3703-5 data sheet. n Networking Equipment, Servers PARAMETER LTC3703-5 LTC3703 n Automotive and Industrial Control Maximum V 60V 100V IN L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and MOSFET Gate Drive 4.5V to 15V 9.3V to 15V ThinSOT and No R are trademarks of Linear Technology Corporation. All other trademarks SENSE + V UV 3.7V 8.7V are the property of their respective owners. Protected by U.S. Patents, including 5408150, CC 5055767, 6677210, 5847554, 5481178, 6304066, 6580258. V UV 3.1V 6.2V CC Typical a T V CC 9.3V TO 15V + V 22F IN Efficiency vs Load Current BAS19 15V TO 100V 25V 100 MODE/SYNC V IN + 30k 68F V = 25V f BOOST IN SET 95 V = 50V LTC3703 Si7456DP IN 10k COMP TG 0.1F 8H 1000pF 470pF V V = 75V IN OUT FB SW 12V 90 15k 5A + 270F I V MAX CC 8.06k 16V 1% 10 INV DRV CC 85 0.1F Si7456DP RUN/SS BG MBR1100 113k 10F 100 1% 80 GND BGRTN 0 1 2 3 4 5 1F 2200pF LOAD (A) 3703 F01b 3703 F01 Figure 1. High Efficiency High Voltage Step-Down Converter 3703fc 1 EFFICIENCY (%) ion pplica ions pplica ion uresLTC3703 a T e Maxi Mu M r a T (Note 1) Supply Voltages Peak Output Current <10s BG,TG ..............................5A V , DRV .......................................... 0.3V to 15V Operating Temperature Range (Note 2) CC CC (DRV BGRTN), (BOOST SW) ....... 0.3V to 15V LTC3703E ............................................40C to 85C CC BOOST ................................................. 0.3V to 115V LTC3703I ........................................... 40C to 125C BGRTN ....................................................... 5V to 0V LTC3703H (Note 9) ............................ 40C to 150C V Voltage .............................................. 0.3V to 100V Junction Temperature (Notes 3, 7) IN SW Voltage (Note 10).................................. 1V to 100V LTC3703E, LTC3703I ........................................ 125C RUN/SS Voltage .......................................... 0.3V to 5V LTC3703H (Note 9) ........................................... 150C MODE/SYNC, INV Voltages ....................... 0.3V to 15V Storage Temperature Range ................. 65C to 150C f , FB, I Voltages................................ 0.3V to 3V Lead Temperature (Soldering, 10 sec.) ..................300C SET MAX p c F T TOP VIEW V 1 28 BOOST IN NC TOP VIEW 2 27 TG NC 3 26 SW MODE/SYNC 1 16 V IN NC 4 25 NC f 2 15 B00ST SET NC 5 24 NC COMP 3 14 TG MODE/SYNC 6 23 NC f FB 4 13 SW 7 22 NC SET COMP 8 21 V CC I 5 12 V MAX CC FB 9 20 DRV CC 6 INV 11 DRV CC I 10 19 BG MAX 7 RUN/SS 10 BG INV 11 18 NC 8 9 GND BGRTN NC 12 17 NC RUN/SS 13 16 NC GN PACKAGE GND 16-LEAD NARROW PLASTIC SSOP 14 15 BGRTN T = 150C, = 110C/W JMAX JA G PACKAGE 28-LEAD PLASTIC SSOP T = 125C, = 100C/W JMAX JA o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3703EGN PBF LTC3703EGN TRPBF 3703 16-Lead Narrow Plastic SSOP 40C to 85C LTC3703IGN PBF LTC3703IGN TRPBF 3703I 16-Lead Narrow Plastic SSOP 40C to 125C LTC3703HGN PBF LTC3703HGN TRPBF 3703H 16-Lead Narrow Plastic SSOP 40C to 150C LTC3703EG PBF LTC3703EG TRPBF LTC3703EG 28-Lead Plastic SSOP 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3703EGN LTC3703EGN TR 3703 16-Lead Narrow Plastic SSOP 40C to 85C LTC3703IGN LTC3703IGN TR 3703I 16-Lead Narrow Plastic SSOP 40C to 125C LTC3703HGN LTC3703HGN TR 3703H 16-Lead Narrow Plastic SSOP 40C to 150C LTC3703EG LTC3703EG TR LTC3703EG 28-Lead Plastic SSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: