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LT1939EDD-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LT1939EDD-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  LT1939 1 1939f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller The LT®1939 is a current mode PWM step-down DC/DC converter with an internal 2.3A switch. The wide input range of 3V to 25V makes the LT1939 suitable for regu- lating power from a wide variety of sources, including automotive batteries, industrial supplies and unregulated wall adapters. Resistor-programmable 250kHz to 2.2MHz frequency range and synchronization capability enable optimization between efficiency and external component size. Cycle- by-cycle current limit, frequency foldback and thermal shutdown provide protection against a shorted output. The soft-start feature controls the ramp rate of the output voltage, eliminating input current surge during start-up, and also provides output tracking. The LT1939 contains an internal NPN transistor with feed- back control which can be configured as a linear regulator or as a linear regulator controller. The LT1939’s low current shutdown mode (<12μA) enables easy power management in battery-powered systems. n Wide Input Range: 3V to 25V n Short-Circuit Protected Over Full Input Range n 2A Output Current Capability n Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.2MHz n Soft-Start/Tracking Capability n Output Adjustable Down to 0.8V n Adjustable Linear Regulator/Driver with 13mA Output Capability n Power Good Comparator with Complementary Outputs n Low Shutdown Current: 12μA n Thermally Enhanced 3mm × 3mm DFN Package n Automotive Battery Regulation n Industrial Control n Wall Transformer Regulation n Distributed Power Regulation Dual Step-Down Converters Output Voltage Ripple Switching Converter Efficiency L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 6.8μH 0.47μF 22μF 22μF 42.2k 8.06k 2.2μF 0.47μF VIN 6V TO 25V 40.2k 53.6k 330pF 1939 TA01a VOUT1 5V 1A VOUT2 3.3V 1A BAT54 B240A BST VIN SW FB SHDN SS LT1939 RT/SYNC VC LDRV LFB PG PG 8.06k 24.9k 1k LOAD CURRENT (A) 0 90 85 80 75 70 65 60 55 50 1.6 1939 TA01b 0.4 0.8 1.2 2.0 1.4 0.2 0.6 1.0 1.8 VIN = 12V IOUT2 = 0A FREQUENCY = 800kHz 500ns/DIV 1939 TA01c VOUT1 = 5V AT 1A AC COUPLED 2mV/DIV VOUT2 = 3.3V AT 1A AC COUPLED 2mV/DIV |
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