The LTC3548 is a dual, constant frequency, synchronous step down DC/DC converter from Linear Technology. It operates from 2.5V to 5.5V input voltage range and has a constant 2.25MHz switching frequency. Each output voltage is adjustable from 0.6V to 5V. It supports 400mA and 800mA output currents. It features high efficiency, low quiescent current, high switching frequency, low on-resistance, and short-circuit protection. It is suitable for low power applications such as PDAs/Palmtop PCs, digital cameras, cellular phones, portable media players, PC cards, wireless and DSL modems.
The LTC3548 is a dual, constant frequency, synchronous step-down DC/DC converter designed for low power applications such as PDAs, digital cameras, and cellular phones. It operates from an input voltage range of 2.5V to 5.5V with a fixed switching frequency of 2.25MHz.
The device features internal synchronous switches rated at 0.35Ω on-resistance (top) and 0.30Ω (bottom), eliminating the need for external Schottky diodes. It offers two selectable operating modes: Burst Mode for high efficiency at light loads, and Pulse Skip Mode for low noise ripple.
| Operating Voltage Range | 2.5V to 5.5V |
|---|---|
| Switching Frequency | 2.25MHz |
| Quiescent Current (Active) | 950 pA |
| Quiescent Current (Shutdown) | <1 pA |
| Top Switch On-Resistance | 0.35Ω |
| Bottom Switch On-Resistance | 0.30Ω |
The device supports Burst Mode operation for high efficiency at light loads and Pulse Skip Mode for low noise ripple.
No, it uses internal synchronous switches to eliminate the need for external Schottky diodes.
The nominal voltage for the feedback pin (Veg) is 0.6V.