LT3724 High Voltage, Current Mode Switching Regulator Controller FEATURESDESCRIPTION n Wide Input Range: 4V to 60V The LT®3724 is a DC/DC controller used for medium power, n Output Voltages up to 36V (Step-Down) low part count, low cost, high efficiency supplies. It of- n Burst Mode® Operation: <100µA Supply Current fers a wide 4V-60V input range (7.5V minimum startup n 10µA Shutdown Supply Current voltage) and can implement step-down, step-up, inverting n ±1.3% Reference Accuracy and SEPIC topologies. n 200kHz Fixed Frequency The LT3724 includes Burst Mode operation, which re- n Drives N-Channel MOSFET duces quiescent current below 100µA and maintains n Programmable Soft-Start high efficiency at light loads. An internal high voltage bias n Programmable Undervoltage Lockout regulator allows for simple biasing and can be back driven n Internal High Voltage Regulator for Gate Drive to increase efficiency. n Thermal Shutdown n Current Limit Unaffected by Duty Cycle Additional features include fixed frequency current mode n 16-Pin Thermally Enhanced TSSOP Package control for fast line and load transient response; a gate driver capable of driving large N-channel MOSFETs; a precision APPLICATIONS undervoltage lockout function; 10µA shutdown current; short-circuit protection; and a programmable soft-start n Industrial Power Distribution function that directly controls output voltage slew rates at n 12V and 42V Automotive and Heavy Equipment startup which limits inrush current, minimizes overshoot n High Voltage Single Board Systems and facilitates supply sequencing. n Distributed Power Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Burst Mode is a trademark of Linear Technology Corporation. All other trademarks are the property n Avionics of their respective owners. Protected by U.S. Patents including 5731694, 6498466, 6611131. n Telecom Power TYPICAL APPLICATIONHigh Voltage Step-Down RegulatorEfficiency and Power Loss V vs Load Current IN 30V TO 95 12 60VCIN VIN BOOST 68µF 90 10 0.22µF 1M TG Si7852 EFFICIENCY LT3724 POWER LOSS (W) 10Ω 0.025Ω VOUT 85 8 SHDN SW 24V 47µH 75W 68.1k C SS3H9 + 80 6 SS COUT 330µF 200k Burst_EN VCC EFFICIENCY (%) 75 4 1µF V LOSS FB PGND 70 2 40.2k V VIN = 48V C SENSE+ 680pF 120pF 1000pF 65 0 SGND SENSE– 0.1 1 10 4.99k 93.1k LOAD CURRENT (A) 3724 TA01b 3724 TA01a 3724fd 1
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