ADI LTC3250ES6-1.5#TRPBF

The LTC3250-1.5/LTC3250-1.2 are charge pump stepdown DC/DC converters that produce a 1.5V or 1.2V regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve typical efficiency two times higher than that of a linear regulator. No inductors are required. A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators. High frequency operation (f₀ₛc = 1.5MHz) simplifies filtering to further reduce conducted noise. The part also uses Burst Mode operation to improve efficiency at light loads. Low operating current (35μA with no load, <1μA in shutdown) and low external parts count (three small ceramic capacitors) make the LTC3250-1.5/LTC3250-1.2 ideally suited for space constrained battery powered applications. The parts are short-circuit and overtemperature protected, and are available in a low profile (1mm) 6-pin ThinSOT package.

• 2.7V to 5.5V Input Voltage Range
• No Inductors
• Li-Ion (3.6V) to 1.5V with 81% Efficiency
• Low Noise Constant Frequency Operation
• Output Voltages: 1.5V±4%, 1.2V±4%
• Output Current: 250mA
• Shutdown Disconnects Load from Vin
• Low Operating Current: I₀ = 35μA
• Low Shutdown Current: Iₛd < 1μA
• Oscillator Frequency = 1.5MHz
• Soft-Start Limits Inrush Current at Turn-On
• Short-Circuit and Overtemperature Protected
• Low Profile (1mm) SOT-23 Package

• Handheld Computers
• Cellular Phones
• Digital Cameras
• Handheld Medical Instruments
• Low Power DSP Supplies