IRDC3870 Datasheet, PDF (1/17 Pages) International Rectifier – USER GUIDE FOR IRDC3870 EVALUATION BOARD

IRDC3870
SupIRBuck^TM
USER GUIDE FOR IRDC3870 EVALUATION BOARD
DESCRIPTION
The IR3870 SupIRBuck^TM is an easy-to-use,
fully integrated and highly efficient DC/DC
voltage regulator. The onboard constant on
time hysteretic controller and MOSFETs
make IR3870 a space-efficient solution that
delivers up to 10A or precisely controlled
output voltage in 60°C ambient temperature
applications without airflow. It is housed in a
in 20 Lead 5mmx6mm QFN package.
Key features offered by the IR3870 include:
programmable switching frequency, soft
start, and over current protection allows for a
very flexible solution suitable for many
different applications and an ideal choice for
battery powered applications.
Additional features include pre-bias startup,
very precise 0.5V reference, over/under voltage
shut down, power good output, and enable
input with voltage monitoring capability.
This user guide contains the schematic and bill
of materials for the IRDC3870 evaluation board.
The guide describes operation and use of the
evaluation board itself. Detailed specifications
and application information for IR3870 is
available in the IR3870 data sheet.
BOARD FEATURES
• V_in = +12V Typical ( 8-19V input Voltage range. see note below)
• PV_cc= +5.0V
• Vcc=+3.3V
• V_out = +1.1V @ 0- 10A
• F_s = 500kHz @ 10A
• L = 0.56uH
• C_in= 1x10uF (ceramic 1210) + 1x68uF (electrolytic)
• C_out= 2x10uF (ceramic 0805) + 1x150uF(SP Cap)
Note: At low input line an additional 10uF ceramic capacitor is recommended at
input to handle higher ripple current)
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