Regulator provides 'lowest dropout voltage' of any monolithic 5A LDO, says Linear
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Linear Technology has announced a digitally programmable linear regulator, which it claims has the lowest dropout voltage, lowest noise and fastest transient response of any monolithic 5A LDO currently available.
The LT3071's dropout voltage at 5A is 85mV, while output voltage noise at 5A is 25uVRMS over a 10Hz to 100kHz bandwidth.
Its 1MHz unity gain bandwidth, coupled with its minimum 15uF ceramic output capacitance, provides 30mV of overshoot/undershoot in response to a 4.5A output load step and has been designed to save bulk capacitance, space and cost.
According to Linear, the LT3071 is suitable for efficiently powering low voltage, high current devices such as fpgas, dsps, asics, microprocessors and post-buck regulation applications.
Its output voltage is digitally programmable from 0.8 to 1.8V in 50mV increments. Accuracy is specified at +/- 1% over line, load and temperature, while an analogue output margining feature is said to adjust system output voltage over a continuous +/- 10% range.
Multiple LT3071 devices can be paralleled for higher output current and to spread heat across a circuit board, while a tracking feature can control a buck regulator powering the LT3071's input. This tracking function is designed to drive the upstream buck regulator to maintain the LT3071's input voltage at VOUT + 300mV, minimising power dissipation. If output voltage is dynamically changed, the tracking function automatically adjusts the output voltage of the buck regulator to maintain efficiency.
The LT3071 is offered in a thermally enhanced, low profile (0.75mm) 28-lead 4 x 5mm QFN package, and both E and I grades operate from -40 to 125°C junction temperature range.
