LinearTechnology Corp. announced high reliability military temperature (MP) gradeversions of the LTC3803/-3/-5 current mode flybackcontrollers in the tiny 6-pin ThinSOT^{a" cent} package. These devices are specified andare 100% production tested over a junction temperature range of -55 to 150C.The input and output voltage ranges of LTC3803/-3/-5-based power supplies arelimited only by external components, enabling wide-input-voltage andhigh-input-voltage applications commonly found in industrial, telecom, militaryand automotive settings.

The constant200 or 300kHz operating frequency is maintained down to very light loads,minimizing low frequency noise generation over a wide range of load current. Anintegrated soft-start function reduces inrush current and output voltageovershoot. A 100mV current sense threshold allows the use of a small currentsense resistor to maintain high efficiency. An LTC3803/-3/-5-based power supplydoes not require any minimum output load for stable operation. An internalshunt regulator allows the LTC3803/-3/-5 to be powered simply from a high inputvoltage through a series resistor. In wide-Vin-range applications where thisisn't feasible, the LTC3803 and LTC3803-3 feature a wide hysteresisundervoltage lockout that enables efficiency-enhancing micropower startup andbootstrap biasing techniques.

All devices are available from stock. Pricingfor the LTC3803/-3/-5MP starts at $3.95 each for 1,000 piece quantities.

Flyback Controllers Operate from -55 to 150C Junction Temperature_A