LT1959CS8#PBF

LT1959 is a 500KHz monolithic buck mode switching regulator functionally identical to the LT1506 but optimized for lower output voltage applications. It will operate down to 1.21V output compared to 2.42V for the LT1506. 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 3.8mA and by utilizing a supply boost capacitor to saturate the power switch. 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.

• Constant switching frequency is 500KHz typical
• Uses all surface mount components
• Inductor size reduced to 1.8µH
• Saturating switch design is 0.07ohm typical
• Shutdown current is 15µA typical
• Easily synchronizable, cycle-by-cycle current limiting
• Current mode control
• Switch current limit is 6A typical at (VC open, VFB = 1.05V, DC ≤ 50%)
• Operating temperature is 0°C to 125°C
• Package style is 8-lead NSOIC

Notes

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