Analog Devices LTC3838EFE | Demoboard DC1626A-B

Description

Demonstration circuit 1626A is a dual output 1.5V/15A and 1.2V/15A synchronous buck converter operating with a switching frequency of 300kHz over an input voltage range of 4.5V to 26V. The demo board comes in two versions. The -A version uses inductor DCR current sensingwith an iron powder inductor for high efficiency. The -B version uses a 2.5mΩ sense resistor for accurate current sensing with a low DCR ferrite inductor. The fixed on-time valley current mode architecture of the LTC3838 allows for a fast load step response (see Figures 6 to 9). The loadstep response can be tested with the on-board load 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 LTC3838EFE is a 38-lead TSSOP with an exposed ground pad.

Features

• MODE jumper to program either DCM or 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