DC2891A

DC2891A demonstration circuit features the LTM®4670EY, a high efficiency, quad 10A step-down power µModule® regulator. The input voltage range is from 2.25V to 5.5V. The output voltage range is 0.5V to VIN. Derating is necessary for certain VIN, VOUT, frequency and thermal conditions. The DC2891A offers the SSTT pin allowing the user to program output tracking, soft-start period and die temperature monitoring. The MODE/SYNC pin either synchronizes the switching frequency to an external clock, is a clock output, or sets the PWM mode. The PWM modes of operation are forced continues mode for low noise or pulse-skipping mode for high efficiency at light load. DC2891A has optional jumper resistors to parallel multiple LTM4670 channels. For paralleled channels, one channel can be set as host, and the rest can be set as servers. The phase shift of a server channel relative to the host channel can be programmed with a resistor divider on the FREQ pin.

• ±1.5% output voltages (0.8V, 1.0V, 1.2V, 1.5V)
• Maximum continuous output current of 10ADC for each channel
• 2MHz operating frequency
• For DC2891A, four channels of LTM4670 are working separately and all set as host