Infineon Technologies IR3899 User Manual

SupIRBuck
USER GUIDE FOR IR3899 EVALUATION BOARD
DESCRIPTION
The IR3899 is a
converter, providing
performance and flexible solution in a small
4mm X 5 mm Power QFN package.
Key features offered by the IR3899 include
internal Digital Soft Start/Soft Stop, precision
0.5Vreference voltage,
thermal protection, programmable switching
frequency, Enable input, input under-voltage
lockout for proper start-up, enhanced line/
load regulation with feed forward, external
frequency synchronization
clocking, internal LDO
up.

BOARD FEATURES

•
V = +12V (+ 13.2V Max)
in
• V
= +1.2V @ 0- 9A
out
•
F =400KHz
s
•
L= 1.0uH
•
C = 4x10uF (ceramic 1206) + 1X330uF (electrolytic)
in
•
C =6x47uF (ceramic 0805)
out
9/18/2012
TM
1.2Vout
synchronous buck
a compact, high
,
Power Good
with smooth
and pre-bias start-
IRDC3899-P1V2
Output over-current protection
implemented by sensing the voltage developed
across the on-resistance of the synchronous
rectifier MOSFET
performance and the current limit is thermally
compensated.
This user guide contains the schematic and bill
of materials for the IR3899 evaluation board.
The guide describes operation and use of the
evaluation board itself. Detailed
information for IR3899 is available in the
IR3899 data sheet.
function
for optimum cost
application
is
and
1