LT1506CS8-3.3#PBF

LT1506 is a monolithic buck mode switching regulator functionally identical to the LT1374 but optimized for lower input voltage applications. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. A special high speed bipolar process and new design techniques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by keeping quiescent supply current to 4mA and by utilizing a supply boost capacitor to saturate the power switch. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used, including the inductor and capacitors. It is used in application such as portable computers, battery-powered systems, battery charger, distributed power.

• Easily synchronizable, operates with input as low as 4V
• Uses all surface mount components
• Cycle-by-cycle current limiting
• Inductor size reduced to 1.8µH, sense voltage is 3.3V
• Saturating switch design is 0.07 ohm typical
• Shutdown supply current is 15µA typical at (VSHDN = 0V, VSW = 0V, VC open)
• Switch frequency is 500KHz typical at (VC set to give 50% duty cycle)
• Synchronizing range is 580KHz to 1000KHz
• Operating junction temperature is 0°C to 125° C
• Package style is 8-lead NSOIC

Notes

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