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LTC1771EMS8#PBF
LTC1771 10µA Quiescent Current High Efficiency Step-Down DC/DC Controller U FEATURES s s s s s s s s s s s s s 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. Very Low Standby Current: 10µA Available in Space-Saving 8-Lead MSOP Package Output Currents: Up to 5A Wide VIN Range: 2.8V to 20V Operation VOUT Range: 1.23V to 18V High Efficiency: Over 93% Possible ±2% Output Accuracy Very Low Dropout Operation: 100% Duty Cycle Current Mode Operation for Excellent Line and Load Transient Response Defeatable Burst ModeTM Operation Short-Circuit Protected Optional Programmable Soft-Start Micropower Shutdown: IQ = 2µA 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. U 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. APPLICATIO S s s s s s s Cellular Telephones and Wireless Modems 1- to 4-Cell Lithium-Ion-Powered Applications Portable Instruments Battery-Powered Equipment Battery Chargers Scanners 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. U TYPICAL APPLICATIO VIN 4.5V TO 18V RSENSE 0.05Ω LTC1771 Efficiency + 100 22µF 25V VIN = 5V VIN RUN/SS CSS 0.01µF SENSE PGATE M1 Si6447DQ ITH LTC1771 RC 10k CC 22OpF VFB MODE GND VIN L1 15µH UPS5817 R2 1.64M 1% + COUT 150µF 6.3V VOUT 3.3V 2A EFFICIENCY (%) 90 80 VIN = 10V VIN = 15V 70 60 50 R1 1M 1% CFF 5pF Figure 1. High Efficiency Step-Down Converter 1771 F01 VOUT = 3.3V RSENSE = 0.05Ω 40 10 0.1 1 100 1000 LOAD CURRENT (mA) 10000 1771 F01b 1
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