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LTC3867-Slide4

Shown on this slide is a schematic of a typical converter using the LTC3867. This circuit converts an input voltage range of 16V to 38V and steps it down to 1.2V at up to 10A. The LTC3867’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 ±300mV) in trace runs, vias and interconnects. A low 65nS minimum ON time allows for a high step-down ratio power supply at high frequency operation. The operating frequency is selectable from 200kHz to 1.2MHz or can be synchronized to an external clock. The output current is monitored by sensing the voltage drop across the output inductor (DCR) for highest efficiency or by using a sense resistor. Additional features include DCR temperature compensation, an onboard bias voltage LDO, soft-start or tracking, adjustable current limit, soft recovery from an output overcurrent condition, overvoltage protection, external VCC control and ±1% reference voltage accuracy over a -40°C to 125°C operating junction temperature range. The LTC3867 is available in a thermally enhanced 4mm x 4mm QFN-24 package.

PTM Published on: 2012-03-19