Buck Converter Operates Up to 140°C T_J

Aug 2, 2005 10:40 PM

Linear Technology has introduced the "H-Grade" version of the LT1976. The LT1976 is a 60-V max, burst mode, step-down switching regulator that maintains quiescent current under 100 µA. The "H" Grade version operates up to a junction temperature of 140°C, compared to the "E" and "I" Grade versions' 125°C maximum junction temperature (T_J). Tested and guaranteed to the maximum junction temperature of 140°C, the "H Grade" parts are ideal for automotive and industrial applications.

The LT1976 operates within a VIN range of 3.3 V to 60 V, making it suitable for load dump or cold-crank conditions found in automotive applications. Its 1.5-A internal switch can deliver up to 1.25 A of continuous output current at voltages as low as 1.25 V. Its 100 µA of quiescent current is ideal for "always on" applications such as automotive security systems that require a long battery life.

Other features include a shutdown current of <1 µA, a power good flag with programmable threshold, a 200-kHz switching frequency, 0.2-Ω on-resistance, peak switch current maintained over full duty cycle range, a 1.25-V feedback reference voltage, the ability to be synchronized, and soft-start capability. Available in a TSSOP-16E package, the LT1976HFE is priced starts at $4.85 each for 1000-piece quantities.