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Integrated voltage regulator delivers over 97% efficiency

Thu, 10/03/2013 - 1:47pm

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International Rectifier 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 SupIRBuckfamily, 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.

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.

Specifications

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

Design tools

A datasheet and application notes are posted on the International Rectifier website at www.irf.com. The IRDC3846 reference design featuring the new device is also available.

Price and availability

Pricing for the IR3846M begins at US $2.60 each in 100,000-unit quantities. The IRDC3846 reference design can be purchased for US $29 per kit.  Production orders are available immediately.

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