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LT3430 Datasheet(PDF) 1 Page - Linear Technology |
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LT3430 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT3844 1 3844fb TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION High Voltage, Current Mode Switching Regulator Controller with Programmable Operating Frequency n Industrial Power Distribution n 12V and 42V Automotive and Heavy Equipment n High Voltage Single Board Systems n Distributed Power Systems n Avionics n Telecom Power High Voltage Step-Down Regulator 48V to 12V, 50W Efficiency and Power Loss vs Load Current n High Voltage Operation: Up to 60V n Output Voltages Up to 36V (Step Down) n Programmable Constant Frequency: 100kHz to 500kHz n Synchronizable up to 600kHz n Burst Mode ® Operation: 120μA Supply Current n 10μA Shutdown Supply Current n ±1.3% Reference Accuracy n Drives N-Channel MOSFET n Programmable Soft-Start n Programmable Undervoltage Lockout n Internal High Voltage Regulator for Gate Drive n Thermal Shutdown n Current Limit Unaffected by Duty Cycle n 16-Pin Thermally Enhanced TSSOP Package The LT ®3844 is a DC/DC controller used for medium power, low part count, high efficiency supplies. It offers a wide 4V to 60V input range (7.5V minimum start-up voltage) and can implement step-down, step-up, inverting and SEPIC topologies. The LT3844 includes Burst Mode operation, which reduces quiescent current below 120μA and maintains high effi- ciency at light loads. An internal high voltage bias regulator allows for simple biasing. Additional features include current mode control for fast line and load transient response; programmable fixed operating frequency that can be synchronized to an ex- ternal clock for noise sensitive applications; a gate driver capable of driving large N-channel MOSFETs; a precision undervoltage lockout function; 10μA shutdown current; short-circuit protection and a programmable soft-start function. The LT3844 is available in a 16-lead thermally enhanced TSSOP package. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5731694, 6498466, 6611131 VIN SHDN CSS BURST_EN VFB VC SYNC fSET BOOST TG SW VCC PGND SENSE+ SENSE– SGND LT3844 3844 TA01 R7 49.9k VOUT 12V 50W 68μF 680p 22μF 120pF 68μF 10k 10Ω 1000pF 0.22μF 10μH 33μF 0.015Ω 14.7k 130k 82.5k 1M 1μF PDS5100H Si7850DP VIN 36V TO 60V LOAD CURRENT (A) 76 82 80 78 90 88 86 84 0 3 2 1 7 6 5 4 3844 TA01b 0.1 10 1 LOSS EFFICIENCY VIN = 48V |
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