IRDC3842 Datasheet, PDF (1/17 Pages) International Rectifier – USER GUIDE FOR IR3842 EVALUATION BOARD

IRDC3842
SupIRBuck^TM
USER GUIDE FOR IR3842 EVALUATION BOARD
DESCRIPTION
The IR3842 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 IR3842 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 IR3842 evaluation board.
The guide describes operation and use of the
evaluation board itself. Detailed application
information for IR3842 is available in the
IR3842 data sheet.
BOARD FEATURES
• V_in = +12V (13.2V Max)
• V_cc=+5V (5.5V Max)
• V_out = +1.8V @ 0- 4A
• F_s=600kHz
• L= 1.5uH
• C_in= 2x10uF (ceramic 1206) + 330uF (electrolytic)
• C_out= 4x22uF (ceramic 0805)
02/02/2009
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