(China (Mainland))
Product Summary
The ltc1773ems/tr is a current mode synchronous buck regulator controller that drives external complementary power MOSFETs using a fixed frequency architecture. The operating supply range is from 2.65V to 8.5V, making it suitable for 1- or 2-cell lithium-ion battery powered applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation which extends operating time in battery-operated systems. The applications of the ltc1773ems/tr are (1)Cellular Telephones; (2)RF PA Supplies; (3)Portable Instruments; (4)Wireless MODEMS; (5)Distributed Power Systems; (6)Notebook and Palm Top Computers, PDAs; (7)Single and Dual Cell Lithium-Ion Powered Devices.
Parametrics
ltc1773ems/tr absolute maximum ratings: (1)Input Supply Voltage: –0.3V to 10.0V; (2)ITH Voltage: –0.3V to 2.5V; (3)RUN/SS, VFB, SENSE– Voltages: –0.3V to VIN; (4)SYNC/FCB Voltage: –0.3V to VIN; (5)BG, TG Voltages:–0.3V to VIN; (6)SW Voltage:–5V to 11V; (7)Operating Ambient Temperature Range:–40°C to 85°C; (8)Junction Temperature: 125°C; (9)Storage Temperature Range:–65°C to 150°C; (10)Lead Temperature (Soldering, 10 sec.): 300°C.
Features
ltc1773ems/tr features: (1)High Efficiency: Up to 95%; (2)Constant Frequency 550kHz Operation; (3)VIN from 2.65V to 8.5V; (4)VOUT from 0.8V to VIN; (5)OPTI-LOOP Compensation Minimizes COUT; (6)Synchronizable up to 750kHz; (7)Selectable Burst Mode Operation; (8)Low Quiescent Current: 80μA; (9)Low Dropout Operation: 100% Duty Cycle; (10)Secondary Winding Regulation; (11)Soft-Start; (12)Current Mode Operation for Excellent Line and Load Transient Response; (13)Low Shutdown IQ = 10μA; (14)±1.5% Reference Accuracy; (15)Precision 2.5V Undervoltage Lockout; (16)Available in 10-Lead MSOP.
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