The constant 300kHz operating frequency is maintained down to very light loads, minimizing low frequency noise generation over a wide range of load current. With adjustable slope compensation, an LTC3803H-3 based power supply achieves fast transient response with minimum output capacitance. An integrated soft-start function reduces inrush current and output voltage overshoot. A 100mV current sense threshold allows the use of a very small current sense resistor even at high power levels to maintain high efficiency. An LTC3803H-3-based design does not require a minimum load on the output for stable operation, and the output voltage is determined by the selection of external components. With its ultralow 40uA start-up and 240uA quiescent current, the IC maintains high efficiency at light loads, allowing the use of a high-value input resistor for low power dissipation and quick power supply start-up.
The LTC3803H-3 operates and is guaranteed over an operating junction temperature of -40°C to 150°C.