DC1940A

Demonstration circuit 1940A is a low quiescent current, synchronous buck converter featuring the LTC®3891EUDC. This demo board converts a 16V to 60V voltage to a 12V at 15A output. The main features of this board include an internal LDO for gate drive power from VIN or EXTVCC, RUN and PGOOD pins, a mode selector that allows the converter to run in constant current mode (CCM), pulse-skipping or Burst Mode® operation, and selectable current limit. The wide input voltage range of 16V to 60V is suitable for double battery automotive and distributed DC power systems where low quiescent current is important. 60V avalanche rated MOSFETs, which are used on DC1940A, can be operated at their rated voltage. However, if application derating requirements are stricter, MOSFETs with higher voltage rating can be used. DC1940A supports the following MOSFET packages: LFPAK, PowerPAK SO-8 and Power 56. The subsequent logic level (SV gate) MOSFETs can be used with DC1940A.

• Supports an adjustable output voltage, soft-start and tracking
• Typical switching frequency of 125KHz
• Typical output ripple (VOUT, 12V) of 80mV (ILOAD = 15A)
• Typical efficiency (VOUT, 12V) of 97%
• Supply quiescent current of 50.8μA (VIN = 24V, VOUT = 12V, IO = 0A, burst mode operation)
• Supply shutdown current of 14.7μA (VIN = 24V)

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