Analog Devices LTC3838EUHF | Demoboard DC1801A-A

Description

Demonstration circuit 1801A is a dual output 1.5V/20A and 1.2V/20A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 14V. The demo board comes in two versions. The A version uses inductor DCR current sensing for highefficiency. The B version uses 2mΩ sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode topology of the LTC3838 allows for a fast load step response (see Figures 6 to 9). The load step response can be tested with the onboardload step circuit and a bench pulse generator.The demo board uses a high density, two sided drop in layout. The entire converter, excluding the bulk output and input capacitors, fits within a compact 1.5” × 1.0” area on the board. The package style for the LTC3838EUHF is a 38-pin QFN with an exposed ground pad.

Features

• • MODE jumper to program either discontinuous mode (DCM) or forced continuous mode (FCM) at light or no load.
• • EXTVCC pin.
• • PLLIN pin to synchronize the converter to an external
• clock.
• • Remote sensing for VOUT1.
• • Optional resistors to tie the two phases together.
• • Each rail has its own RUN pin, PGOOD pin and
• TRACK/SS pin.

More information

• Datasheet
• IC product information