Power

Regulator corrects voltage drop regardless of load current

14th October 2014
Siobhan O'Gorman
0

Designed to power 5V USB applications, the LT3697 35V input capable, step-down switching regulator has been released by Linear Technology. With 60V transient protection, the regulator uses programmable cable drop compensation to deliver 5V regulation at 2.5A to a remote USB port.

Regardless of variations in load current, the programmable cable drop compensation accurately corrects the voltage drop from a long connecting cable. Across the -40 to 125°C temperature range, the 5V output accuracy at the USB port is ±1.0%. Improving system reliability and safety, the device features an accurate and programmable output current limit, a power good indicator and an output current monitor pin. These features also remove the need for a USB switch IC as they enable the user to implement latchoff or auto-retry functionality. Switching noise is kept out of critical frequency bands such as AM radio through an internal switch, which delivers 90% efficiency and can be programmed to switch at 2MHZ. The regulator offers a compact, thermally efficient footprint through it's 16-lead thermally enhanced MSOP and high switching frequency, which ensure that external inductors and capacitors are small. 

Integrated within a single die is the power switch, oscillator, control and cable compensation circuitry. During fault conditions, an additional level of protection is provided by the dual input feedback. An FLT flag and short-circuit and thermal protection further protect USB devices. 

The LT3697 is offered in both a standard (LT3697EMSE) and an industrial temperature version (LT3697IMSE), which operates from a -40 to 125°C junction temperature range. The LT3697EMSE is sold in 1,000 piece quantities and priced at $2.75 each, while the LT3697IMSE is sold in the same quantities and priced at $3.03 each.

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