LTC1622 Datasheet | Linear Technology

LTC1622 Low Input Voltage Current Mode Step-Down DC/DC Controller Features s s s s s s s s s DESCRIPTIO s s s s U APPLICATIO S s s s s s s s High Efficiency Constant Frequency 550k Hz Operation VIN Range: 2V to 10V Multiampere Output Currents OPTI-LOOPTM pensation Minimizes COUT Selectable, Burst Mode Operation Low Dropout Operation: 100% Duty Cycle Synchronizable up to 750k Hz Current Mode Operation for Excellent Line and Load Transient Response Low Quiescent Current: 350µA Shutdown Mode Draws Only 15µA Supply Current ± 1.9% Reference Accuracy Available in 8-Lead MSOP 1- or 2-Cell Li-Ion Powered Applications Cellular Telephones Wireless Modems Portable puters Distributed 3.3V, 2.5V or 1.8V Power Systems Scanners Battery-Powered Equipment , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode and OPTI-LOOP are a trademarks of Linear Technology Corporation. The LTC®1622 is a constant frequency current mode stepdown DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage feature that shuts the LTC1622 down when the input voltage falls below 2V. The LTC1622 boasts a ± 1.9% output voltage accuracy and consumes only 350µA of quiescent current. For applications where efficiency is a prime consideration and the load current varies from light to heavy, the LTC1622 can be configured for Burst Mode TM operation. Burst Mode operation enhances low current efficiency and extends battery run time. Burst Mode operation is inhibited during synchronization or when the SYNC/MODE pin is pulled low to reduce noise and possible RF interference. High constant operating frequency of 550k Hz allows the use of a small inductor. The device can also be synchronized up to 750k Hz for special applications. The high frequency operation and the available 8-lead MSOP package create a high performance solution in an extremely small amount of PCB area. To further maximize the life of the battery...