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Linear Tech IC regulates power supplies

Posted: 06 Sep 2002 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? lt1940? step down regulator? dc/dc regulator ic? switching regulator ic?

The LT1940 step-down switching regulator from Linear Technology Corp. operates from an input of 3.6V to 25V, enabling it to regulate power sources such as four-cell batteries, 5V logic rails, unregulated wall transformers, lead-acid batteries, and distributed power supplies.

The 16-pin TSSOP device can deliver up to 1.4A of output current from each of its two independent channels at output voltages as low as 1.25V. Both converters are synchronized to a single 1.1MHz oscillator and are switched out-of-phase to minimize input ripple current.

The 1.1MHz constant frequency minimizes both switching noise and the size of the external components making the device suitable for noise-sensitive applications such as wireless and xDSL applications.

The LT1940 can be considered as two independent 1.8A(ISW) current mode step-down dc/dc converters on a single die. Although they share the same 1.1MHz oscillator, each converter has independent shutdown and soft start pins.

Furthermore, each converter generates a power-good signal when its output is in regulation, easing power supply sequencing and interfacing with micro controllers and DSPs. Each output voltage is also adjustable via a resistor divider.

Pricing starts at $3.70 each for 1,000-piece quantities.

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