Linear Technology’s LTC3371 is a highly integrated, general-purpose power management solution for systems requiring multiple low-voltage power supplies. The device features four synchronous buck converters, each powered from independent 2,25 V to 5,5 V inputs, and each configurable to share up to four of eight available 1 A power stages.
With eight unique output current configurations, the chip provides substantial flexibility and ease of re-use across many different applications, and is ideal for a wide variety of multichannel industrial, automotive, communications and distributed power systems.
The LTC3371’s buck power stages can be connected in parallel; up to four adjacent power stages can be combined on a single channel, resulting in eight unique output configurations ranging from a quad 2 A buck to a dual 4 A buck. A single inductor may be used for each buck regulator, and any unused power stages may be added to one of the high-power channels for improved overall efficiency.
The LTC3371’s precision enable pin thresholds, independent power-on reset outputs, watchdog timer and die temperature monitor provide flexible and reliable power-up sequencing and system monitoring. All of the switching regulators are internally compensated and need only external feedback resistors to set the output voltages.
The common buck switching frequency can be programmed with an external resistor, synchronised to an external oscillator or set to a default internal 2 MHz clock. The switching regulators may be programmed to operate either in Burst Mode operation for high efficiency at light loads, or in forced continuous PWM mode for lowest noise at light loads. The bucks are phased in 90° steps to reduce noise and input ripple, have forward and reverse current limiting, soft-start to limit inrush current during startup, and short circuit protection.
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