LTC1877EMS8#TR

Product Summary

The LTC1877EMS8#TR is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The 2.65V to 10V input voltage range makes the LTC1877EMS8#TR ideally suited for both single and dual Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low, preventing low frequency ripple from interfering with audio circuitry. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.8V feedback reference voltage. The LTC1877EMS8#TR is available in a space saving 8-lead MSOP package. Lower input voltage applications (less than 7V abs max) should refer to the LTC1877EMS8#TR data sheet.

Parametrics

LTC1877EMS8#TR absolute maximum ratings: (1)Input Supply Voltage (VIN): –0.3V to 12V; (2)ITH, PLL LPF Voltage : –0.3V to 2.7V; (3)RUN, VFB Voltages : –0.3V to VIN; (4)SYNC/MODE Voltage : –0.3V to VIN; (5)SW Voltage : –0.3V to (VIN + 0.3V); (6)P-Channel MOSFET Source Current (DC): 800mA; (7)N-Channel MOSFET Sink Current (DC): 800mA; (8)Peak SW Sink and Source Current : 1.5A; (9)Operating Ambient Temperature Range; (10)Extended Commercial: –40℃ to 85℃; (11)Junction Temperature: 125℃; (12)Storage Temperature Range : –65℃ to 150℃; (13)Lead Temperature (Soldering, 10 sec): 300℃.

Features

LTC1877EMS8#TR features: (1)High Efficiency: Up to 95%; (2)Very Low Quiescent Current: Only 10mA During Operation; (3)600mA Output Current at VIN = 5V; (4)2.65V to 10V Input Voltage Range; (5)550kHz Constant Frequency Operation; (6)Synchronizable from 400kHz to 700kHz; (7)Selectable Burst ModeTM Operation/ Pulse Skipping Mode; (8)No Schottky Diode Required; (9)Low Dropout Operation: 100% Duty Cycle; (10)0.8V Reference Allows Low Output Voltages; (11)ShutdowMode Draws < 1mA Supply Current; (12)±2% Output Voltage Accuracy; (13)Current Mode Control for Excellent Line and Load Transient Response; (14)Overcurrent and Overtemperature Protected; (15)Available i8-Lead MSOP Package.

Diagrams