LTC1707IS8#TR

Product Summary

The LTC1707IS8#TR is a high efficiency monolithic current mode synchronous buck regulator using a fixed frequency architecture. The operating supply range is from 8.5V down to 2.85V, making it suitable for both single and dual lithium-ion battery-powered applications. Burst Mode operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation, extending operating time in battery-powered systems. The switching frequency of the LTC1707IS8#TR is internally set at 350kHz, allowing the use of small surface mount inductors. For noise sensitive applications it can be externally synchronized up to 550kHz. Burst Mode operation of the LTC1707IS8#TR is inhibited during synchronization or when the SYNC/MODE pin is pulled low preventing low frequency ripple from interfering with audio circuitry. Soft-start is provided by an external capacitor. Applications are cellular telephones, portable instruments, wireless modems, rf communications, distributed power systems, single and dual cell lithium.

Parametrics

LTC1707IS8#TR absolute maximum ratings: (1)Input Supply Voltage : –0.3V to 10V; (2)ITH Voltage : –0.3V to 5V; (3)RUN/SS, VFB Voltages : – 0.3V to VIN; (4)SYNC/MODE Voltage : – 0.3V to VIN; (5)P-Channel Switch Source Current (DC): 800mA; (6)N-Channel Switch Sink Current (DC): 800mA; (7)Peak SW Sink and Source Current : 1.5A; (8)Operating Ambient Temperature Range; (9)Commercial : 0℃ to 70℃; (10)Industrial : –40℃ to 85℃; (11)Junction Temperature: 125℃; (12)Storage Temperature Range : – 65℃ to 150℃; (13)Lead Temperature (Soldering, 10 sec): 300℃.

Features

LTC1707IS8#TR features: (1)600mA Output Current (VIN 4V); (2)High Efficiency: Up to 96%; (3)Constant Frequency: 350kHz Synchronizable to 550kHz; (4)2.85V to 8.5V VIN Range; (5)No Schottky Diode Required; (6)1.19V ±1% Reference Output Pin; (7)Selectable Burst ModeTM Operation/Pulse Skipping Mode; (8)Low Dropout Operation: 100% Duty Cycle; (9)Precisio2.7V Undervoltage Lockout; (10)Current Mode Control for Excellent Line and Load Transient Response; (11)Low Quiescent Current: 200mA; (12)ShutdowMode Draws Only 15mA Supply Current; (13)Available i8-Lead SO Package.

Diagrams