A single-voltage synchronous Buck regulator
IR3889 IR OptiMOS™ IPOL 30 A single-voltage synchronous Buck regulator
Features Single 4.3 V to 17 V application or Wide Input Voltage Range from 2.0 V to 17 V with an External VCC Precision Reference Voltage (0.8 V +/-0.5%) Enhenced Fast COT Engine Stable with Ceramic Output Capacitors Optional Forced Continuous Conduction Mode and Diode Emulation for Enhanced Light Load Efficiency Programmable Switching Frequency from 600 kHz to 2 MHz Monotonic Start-Up with Four Selectable Soft-Start Time & Enhanced Pre-Bias Start-Up Thermally Compensated Internal Over Current Protection with Four Selectable Settings Enable input with Voltage Monitoring Capability & Power Good Output Thermal Shut Down Operating Temp: -40 °C < Tj < 125 °C Small Size: 5 mm x 6 mm PQFN Lead-free, Halogen-free and RoHS2 Compliant with Exemption 7a Potential applications Server Applications Storage Applications Telecom & Datacom Applications Distributed Point of Load Power Architectures Product validation
Qualified for industrial applications according to the relevant tests of JEDEC47/20/22 Description
The IR3889 is an easy-to-use, fully integrated dc -dc Buck regulator. The onboard PWM controller and OptiMOS™
FETs with integrated bootstrap diode make IR3889 a small footprint solution, providing high-efficient power
delivery. Furthermore, it uses a fast Constant On-Time (COT) control scheme, which simplifies the design efforts
and achieves fast control response.
The IR3889 has an internal low dropout voltage regulator, allowing operations with a single supply. It can also
operate with an external bias supply, with an extended operating input voltage (PVin) range from 2.0 V to 17 V.
The IR3889 is a versatile regulator, offering programmable switching frequency from 600 kHz to 2 MHz, four
selectable current limits, four selectable soft-start time, Forced Continuous Conduction Mode (FCCM) and Diode
Emulation Mode (DEM) operation.
It also features important protection functions, such as pre-bias start-up, thermally compensated current limit,
over voltage and under voltage protection, and thermal shutdown to give required system level security in the
event of fault conditions. Final Datasheet
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2020-1-16 IR OptiMOS™ IPOL 30 A single-voltage synchronous Buck regulator
Table of contents Table of contents
Features . 1
Potential applications . 1
Product validation . 1
Description . 1 …