LTC7103 105V, 2.3A Low EMI Synchronous Step-Down Regulator FEATURES DESCRIPTION n Wide V Range: 4.4V to 105V (110V Abs Max) The LTC 7103 is a high efficiency, monolithic synchro- IN n Ultralow EMI/EMC Emissions: CISPR25 Compliant nous step-down DC/DC converter utilizing a constant n 2A I When Regulating 48V to 3.3V frequency, average current mode control architecture. It Q IN OUT n Fast and Accurate Output Current Programming and operates from an input voltage range of 4.4V to 105V and Monitoring with No External R provides an adjustable regulated output voltage from 1V SENSE n Brick Wall Current Limit to V while delivering up to 2.3A of output current. IN n Low Minimum On-Time: 40ns The LTC7103 features high frequency operation and a low n Wide V Range: 1V to V OUT IN minimum on-time that reduce inductor size and enable n 100% Maximum Duty Cycle Operation constant-frequency operation even at very high step- n Programmable Fixed Frequency: 200kHz to 2MHz down ratios. In addition, the LTC7103 achieves the low- n Eight, Pin-Selectable Fixed (1.2V to 15V) or est possible dropout voltage with 100% maximum duty AdjustableOutput Voltages cycle operation. During light load operation, converter n Selectable Pulse-Skipping or Low Ripple Burst efficiency and output ripple can be optimized by selecting Mode Operation at Light Loads Burst Mode or pulse-skipping operation. n PLL Synchronization to External Clock n The LTC7103 includes accurate, high speed average cur- EXTV LDO Powers Chip from V = 3.3V to 40V CC OUT n rent programming and monitoring without the need for OPTI-LOOP or Fixed Internal Compensation n an external sense resistor. Additional features include a Input and Output Overvoltage Protection n bypass LDO to maximize efficiency, fixed or adjustable Thermally Enhanced (5mm 6mm) QFN Package output voltage and loop compensation, and a wide array of protection features to enhance reliability. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. n Battery Chargers and CC/CV Supplies n Automotive and Military Systems n Industrial, Avionics and Heavy Equipment n Medical Instruments and Telecommunication Systems TYPICAL APPLICATION Efficiency vs Load Current 5V to 105V Input to 5V/2.3A Output Step-Down Regulator 100 V = 5V OUT 95 V IN V BOOST IN 5V TO 105V 90 0.1F 4.7F 18H LTC7103 V OUT 85 5V RUN SW 2.3A 80 I V CTRL FB 75 OVLO EXTV 100F CC CURRENT I 70 V PRG2 MON MONITOR f = 300kHz SW PLLIN/MODE I 65 TH FIGURE 14 CIRCUIT V = 12V IN FREQ INTV 60 CC V = 24V IN V = 48V SGND PGND 55 IN 1F V = 72V IN 50 7103 TA01a 0.1 1 10 100 1000 LOAD CURRENT (mA) 7103 TA01b Rev. B 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC7103 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V Supply Voltage ....................................0.3V to 110V IN INTV , (BOOST-SW) Voltages .................... 0.3V to 6V CC BOOST Voltage .........................................0.3V to 110V 36 35 32 31 30 RUN Voltage..............................................0.3V to 110V 27 BOOST V , PGOOD Voltages ................................ 0.3V to 16V FB RUN 3 26 SW EXTV Voltage ..........................................0.3V to 41V CC 25 SW R , V , V Voltages .................0.3V to INTV IND PRG1 PRG2 CC 24 SW PGND I , SS Voltages ................................0.3V to INTV CTRL CC 37 SGND 6 FREQ, I , PLLIN/MODE, OVLO Voltages..... 0.3V to 6V TH OVLO 7 Operating Junction Temperature Range (Notes 2, 3, 4) R 8 21 INTV IND CC LTC7103E, LTC7103I .......................... 40C to 125C I 9 20 EXTV TH CC V 10 19 V LTC7103H .......................................... 40C to 150C FB PRG2 11 12 13 14 15 16 17 18 LTC7103MP ....................................... 55C to 150C Storage Temperature Range .................. 65C to 150C UHE36(26) PACKAGE 36-LEAD (5mm 6mm) PLASTIC QFN T = 150C, = 38C/W JMAX JA EXPOSED PAD (PIN 37) IS PGND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC7103EUHE PBF LTC7103EUHE TRPBF 7103 36-Lead (5mm 6mm) Plastic QFN 40C to 125C LTC7103IUHE PBF LTC7103IUHE TRPBF 7103 36-Lead (5mm 6mm) Plastic QFN 40C to 125C LTC7103HUHE PBF LTC7103HUHE TRPBF 7103 36-Lead (5mm 6mm) Plastic QFN 40C to 150C LTC7103MPUHE PBF LTC7103MPUHE TRPBF 7103 36-Lead (5mm 6mm) Plastic QFN 55C to 150C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. Rev. B 2 For more information www.analog.com FREQ PGND PLLIN/MODE PGND CLKOUT PGOOD SS V IN I V CTRL IN I V MON IN V PRG1