IRDC3840A Datasheet, PDF (1/17 Pages) International Rectifier – USER GUIDE FOR IR3840A EVALUATION BOARD

IRDC3840A
SupIRBuck^TM
USER GUIDE FOR IR3840A EVALUATION BOARD
DESCRIPTION
The IR3840A is a synchronous buck
converter, providing a compact, high
performance and flexible solution in a small
5mmx6mm Power QFN package.
Key features offered by the IR3840A include
programmable soft-start ramp, precision
0.7V reference voltage, Power Good,
thermal protection, programmable switching
frequency, Sequence input, Enable input,
input under-voltage lockout for proper start-
up, and pre-bias start-up.
An output over-current protection function is
implemented by sensing the voltage developed
across the on-resistance of the synchronous
rectifier MOSFET for optimum cost and
performance.
This user guide contains the schematic and bill
of materials for the IR3840A evaluation board.
The guide describes operation and use of the
evaluation board itself. Detailed application
information for IR3840A is available in the
IR3840A data sheet.
BOARD FEATURES
• V_in = +12V (13.2V Max)
• V_cc=+5V (5.5V Max)
• V_out = +1.8V @ 0- 14A
• F_s=600kHz
• L= 0.56uH
• C_in= 4x10uF (ceramic 1206) + 330uF (electrolytic)
• C_out= 8x22uF (ceramic 0805)
10/30/2009
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