IR3870MBF Datasheet, PDF (1/20 Pages) International Rectifier – 10A HIGHLY INTEGRATED WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR

PD-97392
IR3870MBF
SupIRBuck^TM
10A HIGHLY INTEGRATED
WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR
Features
• Input Voltage Range: 3V to 26V
• Output Voltage Range: 0.5V to 12V
• Continuous 10A Load Capability
• Constant On-Time control
• Excellent Efficiency at very low output current levels
• Gate drive charge pump option to maximize
efficiency at higher output current levels
• Compensation Loop not Required
• Programmable switching frequency, soft start, and
over current protection
• Power Good Output
• Precision Voltage Reference (0.5V, +/-1%)
• Enable Input with Voltage Monitoring Capability
• Pre-bias Start Up
• Under/Over Voltage Fault Protection
• Ultra small, low profile 5 x 6mm QFN Package
• Lead-free, halogen-free and RoHS compliant
Applications
• Notebook and desktop computers
• Game consoles
• Consumer electronics - STB, LCD TV, Printers
• General purpose POL DC-DC Converters
Description
The IR3870M 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
of precisely controlled output voltage in 60°C
ambient temperature applications without airflow.
Programmable switching frequency, soft start,
and over current protection allows for a very
flexible solution suitable for many different
applications. The combination of the gate drive
charge pump option and constant on time control
allow efficiency optimization in the whole output
current range, making this device 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.
Typical Notebook Application Circuit Diagram
1/27/2010
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