LTC7103 105V, 2.3A Low EMI Synchronous Step-Down Regulator FEATURESDESCRIPTION n Wide VIN Range: 4.4V to 105V (110V Abs Max) The LTC®7103 is a high efficiency, monolithic synchro- n Ultralow EMI/EMC Emissions: CISPR25 Compliant nous step-down DC/DC converter utilizing a constant n 2µA IQ When Regulating 48VIN to 3.3VOUT frequency, average current mode control architecture. It n Fast and Accurate Output Current Programming and operates from an input voltage range of 4.4V to 105V and Monitoring with No External RSENSE provides an adjustable regulated output voltage from 1V n Brick Wall Current Limit to VIN while delivering up to 2.3A of output current. n Low Minimum On-Time: 40ns The LTC7103 features high frequency operation and a low n Wide VOUT Range: 1V to VIN 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 Adjustable Output 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 EXTV The LTC7103 includes accurate, high speed average cur- CC LDO Powers Chip from VOUT = 3.3V to 40V n OPTI-LOOP® or Fixed Internal Compensation rent programming and monitoring without the need for n Input and Output Overvoltage Protection an external sense resistor. Additional features include a n Thermally Enhanced (5mm × 6mm) QFN Package bypass LDO to maximize efficiency, fixed or adjustable output voltage and loop compensation, and a wide array APPLICATIONS of protection features to enhance reliability. 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 APPLICATIONEfficiency vs Load Current5V to 105V Input to 5V/2.3A Output Step-Down Regulator 100 VOUT = 5V V 95 IN VIN BOOST 5V TO 105V 90 4.7µF 0.1µF LTC7103 18µH VOUT 85 RUN SW 5V I 2.3A 80 CTRL VFB OVLO EXTVCC 100µF 75 V CURRENT PRG2 IMON 70 MONITOR EFFICIENCY (%) fSW = 300kHz PLLIN/MODE ITH 65 FIGURE 14 CIRCUIT FREQ INTV VIN = 12V CC 60 VIN = 24V SGND PGND 1µF 55 VIN = 48V VIN = 72V 50 7103 TA01a 0.1 1 10 100 1000 LOAD CURRENT (mA) 7103 TA01b Rev. B Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
