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LTC1622 - Low Input Voltage Current Mode Step-Down DC/DC Controller

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™ 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 550kHz allows the use of a small inductor. The device can also be synchronized up to 750kHz 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 source, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle). In shutdown, the device draws a mere 15µA.

特点 High Efficiency Constant Frequency 550kHz Operation VIN Range: 2V to 10V Multiampere Output Currents OPTI-LOOP™ Compensation Minimizes COUT Selectable, Burst Mode Operation Low Dropout Operation: 100% Duty Cycle Synchronizable up to 750kHz Current Mode Operation for Excellent Line and LoadTransient Response Low Quiescent Current: 350µA Shutdown Mode Draws Only 15µA Supply Current ±1.9% Reference Accuracy Available in 8-Lead MSOP 典型应用

应用 1- or 2-Cell Li-Ion Powered Applications Cellular Telephones Wireless Modems Portable Computers Distributed 3.3V, 2.5V or 1.8V Power Systems Scanners Battery-Powered Equipment 封装信息

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