IRDC3843W Datasheet, PDF (1/17 Pages) International Rectifier – USER GUIDE FOR IR3843W EVALUATION BOARD

IRDC3843W
SupIRBuck^TM
USER GUIDE FOR IR3843W EVALUATION BOARD
DESCRIPTION
The IR3843W 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 IR3843W
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 IR3843W evaluation board.
The guide describes operation and use of the
evaluation board itself. Detailed application
information for IR3843W is available in the
IR3843W data sheet.
BOARD FEATURES
• V_in = +12V (13.2V Max)
• V_cc=+5V (5.5V Max)
• V_out = +1.8V @ 0- 2A
• F_s=600kHz
• L= 3.3uH
• C_in= 1x10uF (ceramic 1206) + 330uF (electrolytic)
• C_out= 2x22uF (ceramic 0805)
10/27/2009
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