DC3138A

Demonstration circuit 3138A is a dual output step-down DC/DC converter that operates over a 12V to 36V input voltage range. It provides two outputs of 5V at 15A and 12V at 10A, and features the LTC®7805 dual output synchronous step-down controller. The two channels can be paralleled for higher output current.

• Frequency jumper for spread spectrum or external clock
• EXTVCC jumper to use VOUT2, EXTVCC, or other derived VCC
• MODE jumper that allows the converter to run in FCM, pulse-skipping, or Burst Mode® operation
• PGOOD signals for each output
• Switching frequency of 350KHz
• Output ripple1 of 40mVP-P (VIN = 24V, IOUT1 = 15A, 20MHz)
• Output ripple2 of 90mVP-P (VIN = 24V, IOUT2 = 10A, 20MHz)
• Efficiency of 96.7% (VIN = 24V, VOUT1 = 0V, IOUT2 = 10A)

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