Date: 03/03/2009

Extreme high temperature withstanding flyback DC/DC controller

Linear Technology has released high junction temperature withstanding H-Grade version of the LTC3803, a current mode flyback DC/DC controller in a small 6-pin ThinSOT package. LTC3803 is specified from -40°C to +150°C operating junction temperature.
With adjustable slope compensation, an LTC3803H-based power supply achieves fast transient response with minimum output capacitance. The LTC3803H can be powered with inputs from 9V to 75V through a series resistor clamped with the IC's internal shunt regulator, making it ideal for 4:1 input range applications.

The ideal application for this controller are automotive, industrial, telecom, Power-over-Ethernet and datacom.

The other key features of LTC3803H are,

Low start-up current of only 40uA
Low Quiescent Current of 240uA
VIN and VOUT Limited by External Components
Adjustable Slope Compensation
Internal Soft Start
Current Mode Control
200kHz Operating Frequency
Package: 6-pin ThinSOT package

The H-Grade version is production tested and guaranteed over an operating junction temperature range -40°C to 150°C, making it ideal in wide temperature range applications. The E- and I-Grade versions are specified for 85°C and 125°C maximum junction temperature, respectively. Pricing starts at $1.63 each in 1,000-piece quantities. For more information, visit www.linear.com.