IR's 35A IR3846 SupIRBuck® Integrated Voltage Regulator Delivers Over 97% Efficiency, Shrinks PCB Size 60% Compared to Discrete Solutions

Oct 3, 2013 | Technology Media

EL SEGUNDO, Calif. — International Rectifier, IR® (NYSE: IRF), a world leader in power management technology, today announced the introduction of the IR3846 35A Point-of-Load (POL) integrated voltage regulator for space constrained enterprise power applications including servers, storage and netcom and telecom equipment that require high power density.

The IR3846 offers industry leading efficiency greater than 97% peak, and 95% at 35A with the capability to operate directly from 12V at high switching frequency without the need for a heatsink or fan. The new device features remote differential sensing enabling 0.5% Vref accuracy between 0°C and 105°C making it well suited for high power FPGAs and ASICs requiring 1% DC or 3% DC+AC accurate power supply.

As part of the Gen3 SupIRBuck® family, the IR3846 features a proprietary modulator scheme that enables jitter-free and noise-free operation to allow higher frequency/higher bandwidth operation for better transient response and fewer output capacitors, and space savings of 20% PCB space compared to alternative integrated solutions and 60% compared to discrete solutions.

"Leveraging the key attributes of IR's Gen3 SupIRBuck® technology, the IR3846 is a complete 35A solution that offers high density and superior performance in a highly compact 200mm2 footprint for today's space constrained server, network communications and storage systems," said Cecilia Contenti, IR's POL Senior Marketing Manager.

The pinout of the IR3846 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.

Part Number Package Circuit Vin Vout Iout Switching Frequency
IR3846M PQFN 5x7mm Single Output 5V-21V (self biased)
1.5V-21V with ext 5V bias
0.6V-86%Vin 35A 300-1,500kHz
Reference Design Featured Part VIN Range
(V)
VOUT Range
(V)
IOUT(A) Switching Frequency
(kHz)
IRDC3846 IR3846M 12V 1.2V 35A 600

A datasheet and application notes are posted in the product tables above. The IRDC3846 reference design featuring the new device is also available.

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