Transcript High Current IR3847 Gen3 SupIRBuck

High Current IR3847 Gen3 SupIRBuck®
The IR3847 is a high current Point-of-Load
(POL) integrated voltage regulator that
extends the current rating of IR’s third
generation SupIRBuck® family up to 25A in a
compact 5x6mm package.
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Features
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Single 5V to 21V application
Output voltage range: 0.6V to 0.86*PVin
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0.5% accurate reference voltage
Operating junction temp: -40ºC<Tj<125ºC
Programmable switching frequency up to 1.5 MHz
True remote differential voltage sensing
Smart LDO to enhance light load efficiency
Vp for tracking applications
Vref is available externally to enable margining
External synchronization with smooth clocking
Thermally compensated current limit and hiccup mode
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over current protection
Overvoltage protection which remains active even
when enable is low
Programmable power good output with tracking
Enhanced pre-bias startup
Body braking to improve transient
Integrated bootstrap diode
Small size 5mm x 6mm PQFN
Pb-Free (RoHS compliant)
As a result of a new thermally enhanced package
using copper clip and several proprietary innovations
in the controller, the IR3847 can operate at 25A
without heatsink, and reduces the PCB size by 20%
compared to alternative integrated solutions and 70%
compared to discrete solutions using a controller and
power MOSFETs. A complete 25A power supply
solution can be implemented in as little as 168mm2.
As part of the new Gen3 SupIRBuck® single input
voltage (5V-25V) family, the IR3847 features a
proprietary modulator scheme that reduces jitter by
90% compared to standard solutions. This has the
dual benefit of reducing output voltage ripple by
approximately 30% and allowing higher
frequency/higher bandwidth operation for smaller size,
better transient response and fewer output capacitors.
The pinout is optimized for easy placement of bypass
capacitors and the internal thermally compensated
current limit offers three settings that allow
programmability without extra components and layout
complications.
REFERENCE
DESIGNS
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RELEASE
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GRAPHIC
March 2013