Synchronous step-down regulator offers differential output sensing and clock synchronization

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By eeNews Europe

The device’s 4.5 V to 24 V input range supports a wide variety of applications, including most intermediate bus voltages. Integrated N-channel MOSFETs can deliver continuous load currents as high as 15 A at output voltages ranging from 0.6 V to 5.5 V, making it ideal for point-of-load applications.

The LTC3613’s differential amplifier provides true remote output voltage sensing of both the positive and negative terminals, enabling high accuracy regulation independent of IR losses (up to ±500 mV) in trace runs, vias and interconnects. A low 65 ns minimum on-time allows for a high step-down ratio power supply at high frequency operation.

The operating frequency is selectable from 200 kHz to 1 MHz and can be synchronized to an external clock. The output current is monitored by sensing the voltage drop across the output inductor’s DCR for highest efficiency or by using a sense resistor. Additional features include an onboard bias voltage LDO, soft-start or tracking, overvoltage protection, current limit foldback and external V CC control.

The LTC3613 offers superior total differential output regulation accuracy and is specified to account for all error sources including line, load and differential sensing. The LTC3613’s total differential output voltage accuracy is ±0.25% at 25°C, ±0.67% from 0°C to 85°C and ±1% over the full -40 to 125°C operating junction temperature range.

The LTC3613EWKH is available in a thermally enhanced 7mm x 9mm QFN-56 package.

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