IR3821AMPBF_08 Datasheet, PDF (1/21 Pages) International Rectifier – HIGHLY INTEGRATED 9A WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR

PD-60332
IR3821AMPbF
SupIRBuck^TM
HIGHLY INTEGRATED 9A
WIDE-INPUT VOLTAGE, SYNCHRONOUS BUCK REGULATOR
Features
• Wide Input Voltage Range 2.5V to 21V
• Wide Output Voltage Range 0.6V to 12V
• Continuous 9A Load Capability
• 300kHz High Frequency Operation
• Programmable Over-Current Protection
• Programmable PGood Output
• Hiccup Current Limit
• Precision Reference Voltage (0.6V)
• Programmable Soft-Start
• Pre-Bias Start-up
• Thermal Protection
• Thermally Enhanced Package
• Small Size 5mmx6mm QFN
• Pb-Free (RoHS Compliant)
Applications
Description
The IR3821A SupIRBuck^TM is an easy-to-use,
fully integrated and highly efficient DC/DC
regulator. The onboard switching controller and
MOSFETs make the IR3821A a space-efficient
solution, providing accurate power delivery for
low output voltage applications.
The IR3821A operates from a single 4.5V to 14V
input supply and generates an output voltage
adjustable from 0.6V to 0.8*Vin at loads up to 9A.
A versatile regulator offering programmability of
startup time, power good threshold and current
limit, the IR3821A’s fixed 300kHz switching
frequency allows the use of small external
components.
• Distributed Point-of-Loads
• Server and Workstations
• Embedded Systems
• Storage Systems
• DDR Applications
• Graphics Cards
• Game Consoles
• Computing Peripheral Voltage Regulators
The IR3821A also features important protection
functions, such as Pre-Bias startup, hiccup
current limit and thermal shutdown to provide the
required system level security in the event of fault
conditions.
Fig. 1. Typical application diagram
11/04/08
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