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Voltage Regulators Shrink PCB Size

Wed, 11/03/2010 - 10:30am

SupIRBuck integrated point-of-load (POL) voltage regulatorsInternational Rectifier today introduced a new family of SupIRBuck integrated point-of-load (POL) voltage regulators in a compact 4 x 5 mm package. The devices, tailored for energy-efficient server, storage, telecom, netcom and set-top box applications offer the same efficiency and functionality as previous generation devices in a 33 percent smaller footprint.

The IR38(53)(56)(59) SupIRBuck voltage regulators integrate a high performance controller with latest generation MOSFETs in a slim 4 x 5 mm PQFN package, and deliver 4 A, 6 A and 9 A output current respectively to achieve more than 96 percent peak efficiency. New features include over-voltage protection, an external synchronization option to reduce noise and EMI in multi-rail systems, true output voltage sensing option for adjustable PGOOD, and OV threshold setting.

The new devices eliminate the need for traditional dual stage POL conversion and save energy, size and cost by operating directly from 12 Vin. While optimized for 12 V input voltage, superior efficiencies are also achieved in applications with single 5 V input voltages. As a result of programmable switching frequencies up to 1.5 MHz and small 4 x 5mm footprint, the new voltage regulators shrink size and cost, in addition to achieving higher power density. Moreover, the common footprint of the devices provides design flexibility and allows cut-and-paste layout for fast time-to-market.

“The IR38(53)(56)(59) family provides the same efficiency and functionality as previous SupIRBuck devices in a 33 percent smaller footprint to dramatically reduce PCB size, making them well suited for space constrained POL applications. Additionally, this new SupIRBuck family offers a smaller and more cost competitive solution below 9 Amps,” said Cecilia Contenti, IR’s POL product marketing manager, Enterprise Power Business Unit.

SupIRBuck family features also include programmable hiccup current limit, programmable soft start, enhanced pre-bias start up, thermal protection, enable pin with voltage monitoring capability, Power Good output for under-voltage and over-voltage detection, +/- 1 percent accurate 0.7V reference in 0-125°C temperature range, and -40oC to 125oC operating junction temperature.

Specifications

Part Number

Package

Circuit

VIN Range (V)

VOUT Range V)

IOUT(A)

Switching Frequency

 (kHz)

IR3853MTRPbF

PQFN

4x5

Single

Output

1.5 - 21

0.7 – 90%Vin

4

250 -1,500

IR3856MTRPbF

PQFN

4x5

Single

Output

1.5 - 21

0.7 – 90%Vin

6

250 -1,500

IR3859MTRPbF

PQFN

4x5

Single

Output

1.5 - 21

0.7 – 90%Vin

9

250 -1,500

Reference Design

Featured Part

VIN Range (V)

VOUT Range (V)

IOUT(A)

Switching Frequency (kHz)

IRDC3853

IR3853MPbF

12

1.8

4

600

IRDC3856

IR3856MPbF

12

1.8

6

600

IRDC3859

IR3859MPbF

12

1.8

9

600


Design Tools

Datasheets and application notes are posted on the International Rectifier website at www.irf.com. The IRDC3853, IRDC3856 and IRCD3859 SupIRBuck reference designs featuring the new devices are also available.

Price and Availability
Pricing for the IR3853M begins at US $1.10 each in 100,000-unit quantities. The IR3856M and IR3859M cost US $1.25 and US $1.40 each respectively in 100,000-unit quantities. Pricing for the new IRDC38(53)(56)(59) SupIRBuck reference designs starts at US $94 per kit. Production orders are available immediately. Prices are subject to change.

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