The LT1767EMS8-5 is a 1.25MHz monolithic buck switching regulator. A high efficiency 1.5A, 0.22W switch is included on the die together with all the control circuitry required to complete a high frequency, current mode switching regulator. Current mode control provides fast transient response and excellent loop stability. New design techniques achieve high efficiency at high switching frequencies over a wide operating range. A low dropout internal regulator maintains consistent performance over a wide range of inputs from 24V systems to LiIon batteries. An operating supply current of 1mA improves efficiency, especially at lower output currents. Shutdown reduces quiescent current to 6mA. Maximum switch current remains constant at all duty cycles. Synchronization allows an external logic level signal to increase the internal oscillator from 1.4MHz to 2MHz. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. High frequency operation allows the reduction of input and output filtering components and permits the use of chip inductors.Features:1.5A Switch in a Small MSOP PackageConstant 1.25MHz Switching FrequencyWide Operating Voltage Range: 3V to 25VHigh Efficiency 0.22W Switch1.2V Feedback Reference VoltageFixed Output Voltages of 1.8V, 2.5V, 3.3V, 5V2% Overall Output ToleranceUses Low Profile Surface Mount ComponentsLow Shutdown Current: 6mASynchronizable to 2MHzCurrent Mode Loop ControlConstant Maximum Switch Current Rating at All Duty CyclesApplications:DSL ModemsPortable ComputersWall AdaptersBattery-Powered SystemsDistributed PowerMSOP-8 package. Manufactured by Linear Technology. Sold in a package of 5.
