Monolithic 1Amp DC:DC Step-down Regulator

The EL7551 is an integrated, synchronous step-down regulator with output voltage adjustable from 1.0V to 3.8V. It is capable of delivering 1A continuous current at up to 95 efficiency. The EL7551 operates at a constant frequency pulse width modulation (PWM) mode, making external synchronization possible. Patented on-chip resistorless current sensing enables current mode control, which provides cycle-by-cycle current limiting, over-current protection, and excellent step load response. The EL7551 is available in a fused-lead 16-pin QSOP package. With proper external components, the whole converter fits into a less than 0.4 in2 area. The minimal external components and small size make this EL7551 ideal for desktop and portable applications.

Features

? Integrated synchronous MOSFETs and current mode controller

? 1A continuous output current

? Up to 95 efficiency

? 4.5V to 5.5V input voltage

? Adjustable output from 1V to 3.8V

? Cycle-by-cycle current limit

? Precision reference

? ±0.5 load and line regulation

? Adjustable switching frequency to 1.2MHz

? Oscillator synchronization possible

? Internal soft start

? Over temperature protection

? Under voltage lockout

? 16-pin QSOP package

? Pb-free plus anneal available (RoHS compliant)

Applications

? DSP, CPU Core and IO Supplies

? Logic/Bus Supplies

? Portable Equipment

? DC:DC Converter Modules

? GTL + Bus Power Supply