Global Sources
EE Times-Asia
Stay in touch with EE Times Asia
?
EE Times-Asia > Power/Alternative Energy
?
?
Power/Alternative Energy??

Multiphase step-up DC/DC controller renders high power

Posted: 27 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:step up multiphase? power high?

Linear Technology Corp. introduces the LTC3862, a two-phase step-up (boost) DC/DC controller that delivers high output power in a compact footprint. Up to 12 power stages can be paralleled and clocked out-of-phase to minimize input and output filtering requirements. According to Linear, the 4V to 36V input voltage range and a wide output voltage range that is dependent on the choice of external components covers a broad range of high power boost applications. The LTC3862 can regulate a 48V at 5A output with up to 97 percent efficiency from an input source ranging from 12V to 36V using only two-phases. Applications include high power audio amplifiers, automotive fuel injection systems, networking and industrial power supplies.

Multiphase operation is enabled using the sync input, clock output and phasemode control pin, allowing 2-, 3-, 4-, 6- or 12-phase operation. The LTC3862 utilizes peak current mode architecture for easy loop compensation and multiphase operation with excellent phase-to-phase current matching. The fixed operating frequency can be set with a single resistor over a 75kHz to 500kHz range or can be synchronized to an external clock using the internal phased-lock-loop over a 50kHz to 600kHz frequency range. A current sense resistor is used in each phase to provide a precise cycle-by-cycle current limit. The powerful on-board CMOS gate drivers minimize switching losses and allow the use of multiple MOSFETs in parallel for even higher current applications. Other features include an on-board 5V LDO that eliminates the need for a bias voltage to power the IC, undervoltage lockout protection, a precise RUN pin threshold with programmable hysteresis, adjustable soft-start, programmable maximum duty cycle and user-adjustable leading edge blanking.

The LTC3862 is offered in narrow SSOP-24 and 5mm x 5mm QFN-24 package. Three temperature grades are available with commercial grade operation from -40 to 85C, an industrial range from -40C to 125C, and a high temp automotive range of -40 C to 150C. The 1,000-piece price starts at $3.29 each.





Article Comments - Multiphase step-up DC/DC controller ...
Comments:??
*? You can enter [0] more charecters.
*Verify code:
?
?
Webinars

Seminars

Visit Asia Webinars to learn about the latest in technology and get practical design tips.

?
?
Back to Top