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Demonstration Circuit DC2966A shows the LTC3376 4-channel configurable buck regulator operating in configuration CFG[3:0] = 0000. This sets the LTC3376 to operate as a quad buck with all four possible outputs, each capable of 3A. By default, outputs 1-4 are set at 5V, 3.3V, 2.5V, and 1.8V, respectively.
Outputs can be enabled, disabled, or sequenced individually. By default, all channel inputs are separate but the board can be configured to power all or some channels from a common input. Each channel has a PGOOD LED indicator to show that its output is regulating within the desired range. Switching operation can allow burst mode for high-efficiency operation at low load currents but can also be forced to continuous PWM for more deterministic EMI.
The PCB is laid out on 6 layers and the demonstration circuit provides access to all features of the LTC3376.