The LTC3823 can operate at very low duty cycles, ranging from 2% to 90% and is able to develop output voltages from 0.6V to 90% VIN (0.6V to 3.3V with remote sense). The input voltage range is from 4.5V to 30V. The LTC3823’s constant on-time architecture allows the control loop to respond instantly to load steps. This IC uses current mode control and can operate without a sense resistor by sensing the voltage drop across the synchronous power MOSFET. For systems where control of maximum output current is important, a sense resistor can be used in series with the source of the lower MOSFET. In either case the current limit is user-programmable, allowing optimum system efficiency and excellent control over the maximum output current.
The LTC3823 output voltage accuracy is ±0.5% at room temp and ±0.67% from 0°C to 85°C. Tracking and sequencing functions allow the user to optimize power-up and power-down of multiple power supplies. In addition, the LTC3823 can be configured for phase-lock loop frequency synchronization.
The LTC3823 is offered in a 28-lead narrow SSOP or a 32-lead 5mm x 5mm QFN package and has an operating temperature range from -40°C to 85°C. The 1,000-piece price starts at $2.75 each.