These devices are specified and are 100 percent production tested over a junction temperature range of -55 to 150 degrees C. The input and output voltage ranges of LTC3803/-3/-5-based power supplies are limited only by external components, enabling wide-input-voltage and high-input-voltage applications commonly found in industrial, telecom, military and automotive settings.

The constant 200 kHz or 300 kHz operating frequency is maintained down to very light loads, minimizing low frequency noise generation over a wide range of load current. An integrated soft-start function reduces inrush current and output voltage overshoot. A 100 mV current sense threshold allows the use of a small current sense resistor to maintain high efficiency.

An LTC3803/-3/-5-based power supply does not require any minimum output load for stable operation. An internal shunt regulator allows the LTC3803/-3/-5 to be powered simply from a high input voltage through a series resistor. In wide-Vin-range applications where this isn’t feasible, the LTC3803 and LTC3803-3 feature a wide hysteresis undervoltage lockout that enables efficiency-enhancing micropower startup and bootstrap biasing techniques.

Summary features LTC3803/-3/-5MP

• Application Input Voltage Range: 5 V/9 V to 75 V and Above
•  -55 to 150 degrees C Operating Junction Temperature Range
•  Ideal for Wide Input Voltage Range Isolated Supplies
•  VIN and VOUT Limited Only by External Components
•  200 kHz or 300 kHz Fixed Operating Frequency
•  Start up Current of Only 40 µA
•  Low 240 µA Quiescent Current
•  Adjustable Slope Compensation
•  Internal Soft Start
•  Current Mode Control
•  Tiny 6-Pin ThinSOT Package

Availability and Pricing

The LTC3803-3 differs from the LTC3803, with its higher 300 kHz operating frequency. The LTC3803-5 differs from the LTC3803 with its lower 5 V turn-on voltage. All devices are available from stock. Pricing for the LTC3803/-3/-5MP starts at 3.95 US Dollars each for 1,000 piece quantities.

Datasheet: LTC3803