LTC1771 Datasheet | Linear Technology

Features s Very Low Standby Current: 10µA s Available in Space-Saving 8-Lead MSOP Package s Output Currents: Up to 5A s Wide VIN Range: 2.8V to 20V Operation s VOUT Range: 1.23V to 18V s High Efficiency: Over 93% Possible s ±2% Output Accuracy s Very Low Dropout Operation: 100% Duty Cycle s Current Mode Operation for Excellent Line and Load Transient Response s Defeatable Burst Mode TM Operation s Short-Circuit Protected s Optional Programmable Soft-Start s Micropower Shutdown: IQ = 2µA U APPLICATIO S s Cellular Telephones and Wireless Modems s 1- to 4-Cell Lithium-Ion-Powered Applications s Portable Instruments s Battery-Powered Equipment s Battery Chargers s Scanners 10µA Quiescent Current High Efficiency Step-Down DC/DC Controller DESCRIPTIO The LTC®1771 is a high efficiency current mode stepdown DC/DC controller that draws as little as 10µA DC supply current to regulate the output at no load while maintaining high efficiency for loads up to several amps. The LTC1771 drives an external P-channel power MOSFET using a current mode, constant off-time architecture. An external sense resistor is used to program the operating current level. Current mode control provides short-circuit protection, excellent transient response and controlled start-up behavior. Burst Mode operation enables the LTC1771 to maintain high efficiency down to extremely low currents. Shutdown mode further reduces the supply current to a mere 2µA. For low noise applications, Burst Mode operation can be easily disabled with the MODE pin. Wide input supply range of 2.8V to 18V (20V maximum) and 100% duty cycle operation for low dropout make the LTC1771 ideal for a wide variety of battery-powered applications where maximizing battery life is important. The LTC1771’s availability in both 8-lead MSOP and SO packages provides for a minimum area solution. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. TYPI...