FEATURES
s s s s s s s s s DESCRIPTIO s s s High Efficiency: Up to 94% 250mA Output Current Wide VIN Range: 2.5V to 9.8V 550kHz Constant Frequency Operation Burst ModeTM Operation at Light Load Low Dropout: 100% Duty Cycle 0.8V Reference Allows Low Output Voltages ± 2.5% Reference Accuracy Current Mode Operation for Excellent Line and Load Transient Response Low Quiescent Current: 135µA Shutdown Mode Draws Only 8µA Supply Current Low Profile (1mm) ThinSOTTM Package The LTC®1779 is a constant frequency current mode stepdown DC/DC converter in a 6-lead ThinSOT package. The part operates with a 2.5V to 9.8V input and can provide up to 250mA of output current. Current mode control provides excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down To further maximize the life of a battery source, the internal P-channel MOSFET is turned on continuously in dropout (100% duty cycle). In shutdown, the device draws a mere 8µA. High constant operating frequency of 550kHz allows the use of a small external inductor.
Linear Technology
