LT1959IR#PBF

LT1959 is a monolithic buck mode switching regulator functionally identical to the LT1506 but optimized for lower output 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. It is widely used in application such as portable computers, battery-powered systems, battery chargers, distributed power, 5V to 3.3V conversion, 5V to 2.5V conversion, 5V to 1.8V conversion etc.

• Operates with input as low as 4V
• Feedback voltage is 1.21V typical
• Uses all surface mount component
• Inductor size reduced to 1.8µH
• Switch on resistance is 0.07 ohm typical at (SW = 4.5A)
• Easily synchronizable, cycle-by-cycle current limiting
• 4.5A switch, current mode control
• Shutdown current is 15µA typical at (VSHDN = 0V, VSW = 0V, VC open)
• Operating junction temperature is -40°C to 125°C
• Package style is 7-lead plastic DD

注释

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