Linear releases H-Grade LTC3803 DC/DC controller
A Linear Technology Corp product story
Edited by the Electronicstalk editorial team Aug 21, 2009
Linear Technology has unveiled the H-Grade version of the LTC3803: a current-mode flyback DC/DC controller in a tiny six-pin ThinSOT package.
With its ultra-low 40uA start-up and 240uA quiescent current, the device allows the use of a high-value input resistor and a low-value capacitor for low power dissipation and quick power supply start-up.
Linear Technology has announced the H-Grade version of the LTC3803, a current mode flyback DC/DC controller in a tiny 6-pin ThinSOT package.
The company claims that the LTC3803H contains all the necessary features to design a high-efficiency single-ended isolated or non-isolated flyback converter suitable for automotive, industrial, telecommunications, power-over-Ethernet and datacom requirements.
With adjustable slope compensation, an LTC3803H-based power supply is said to achieve fast transient response with minimum output capacitance.
The constant 200kHz operating frequency is maintained down to very light loads, resulting in less low-frequency noise generation over a wide range of load currents.
An integrated soft-start function reduces inrush current, decreasing output voltage overshoot.
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 suitable for 4:1 input range applications.
The 100mV current sense threshold enables the use of a very small current sense resistor even at high power levels, ensuring high efficiency.
The H-Grade version is production tested and guaranteed over an operating junction temperature range of -40C to +150C, making it suitable for use in wide temperature-range applications.
The E- and I-Grade versions are specified for 85C and 125C maximum junction temperatures respectively.
Pricing starts at USD1.63 (GBP0.99) each in 1,000-piece quantities.
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Contact Linear Technology Corp
Tel +44 1628 477066
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