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LT7101 Datasheet(PDF) 1 Page - Analog Devices |
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LT7101 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 38 page  LT7101 1 Rev. 0 For more information www.analog.com Document Feedback TYPICAL APPLICATION FEATURES DESCRIPTION 105V, 1A Low EMI Synchronous Step-Down Regulator with Fast Current Programming The LT®7101 is a high efficiency, monolithic synchro- nous step-down DC/DC converter utilizing a constant frequency, average current mode control architecture. It operates from an input voltage range of 4.4V to 105V and provides an adjustable regulated output voltage from 1V to VIN while delivering up to 1A of output current. The LT7101 features high frequency operation and a low minimum on-time that reduce inductor size and enable constant-frequency operation even at very high step- down ratios. In addition, the LT7101 achieves the lowest possible dropout voltage with 100% maximum duty cycle operation. During light load operation, converter efficiency and output ripple can be optimized by selecting Burst Mode, pulse-skipping or forced continuous operation. The LT7101 includes accurate, high speed average cur- rent programming and monitoring without the need for an external sense resistor. Additional features include a bypass LDO to maximize efficiency, fixed or adjustable output voltage and loop compensation, and a wide array of protection features to enhance reliability. 5V to 105V Input to 5V/1A Output Step-Down Regulator Efficiency vs Load Current APPLICATIONS n Wide VIN Range: 4.4V to 105V (110V Abs Max) n Ultralow EMI/EMC Emissions: CISPR 25 Compliant n 2µA IQ When Regulating 48VIN to 3.3VOUT n Fast and Accurate Output Current Programming and Monitoring with No External RSENSE n Brick Wall Current Limit n Low Minimum On-Time: 35ns n Wide VOUT Range: 1V to VIN n 100% Maximum Duty Cycle Operation n Programmable Fixed Frequency: 200kHz to 2MHz n Eight, Pin-Selectable Fixed (1.2V to 15V) or Adjustable Output Voltages n Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode® Operation at Light Loads n PLL Synchronization to External Clock n EXTVCC LDO Powers Chip from VOUT = 3.3V to 40V n OPTI-LOOP® or Fixed Internal Compensation n Input and Output Overvoltage Protection n Thermally Enhanced (5mm × 6mm) QFN Package 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 7101 TA01a VFB EXTVCC VPRG2 FREQ BOOST SW VIN RUN ICTRL IMON CURRENT MONITOR 4.7µF 1µF VOUT 5V 1A VIN 5V TO 105V OVLO PLLIN/MODE LT7101 INTVCC ITH PGND SGND 47µF 0.1µF 47µH LOAD CURRENT (mA) 0.1 1 10 100 1000 50 55 60 65 70 75 80 85 90 95 100 7101 TA01b VIN = 12V VIN = 24V VIN = 48V VIN = 72V fSW = 300kHz FIGURE 14 CIRCUIT |
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