Three-phase step-down DC/DC controller targets high current rails
May 13, 2010 // Paul Buckley
Linear Technology Corporation has introduced a three-phase single output high efficiency (up to 95 percent) synchronous step-down DC/DC controller with PolyPhase operation, differential output voltage sensing and integrated phased-lock loop (PLL) clock synchronization.
Up to six phases can be paralleled and clocked out of phase to minimize input and output filtering requirements for high current applications (up to 150 A). The differential amplifier provides true remote output voltage sensing of both the positive and negative terminals, enabling high accuracy regulation independent of IR losses in trace runs, vias and interconnects. Applications include high current ASIC and FPGA supplies, power distribution buses, high power audio amplifiers and network servers.
The LTC3829 operates with all N-channel MOSFETs from input voltages ranging from 4.5 V to 38 V, and it can produce ±0.75 percent accurate output voltages from 0.6 V to 5 V. The output current is sensed by monitoring the voltage drop across the output inductor (DCR) or by using a sense resistor. Programmable DCR temperature compensation maintains an accurate and constant current limit set point over a broad temperature range. The powerful onboard gate drivers minimize MOSFET switching losses and allows the use of multiple MOSFETs connected in parallel. A fixed operating frequency can be programmed from 250 kHz to 770 kHz or can be synchronized to an external clock with its internal PLL. The device's minimum on time of just 90ns makes the LTC3829 ideal for high step-down ratio applications.
The LTC3829 incorporates an adjustable Stage Shedding technique to increase light load efficiency by eliminating the gate charge and switching losses of two of its output stages. In addition, the LTC3829 can be configured for adjustable Burst Mode operation, producing even higher efficiency at light loads. An optional non-linear control mode improves load step transient response and adaptive voltage positioning (AVP) minimizes the maximum transient voltage deviation during a step-load.
Tracking and sequencing functions allow the optimization of power-up and power-down of multiple power supplies. Additional features include current mode control, an onboard LDO for IC power, programmable soft start, a power good output and external VCC.
Availability and Pricing
The LTC3829 is available in thermally enhanced 38-lead TSSOP or 38-lead 5 mm x 7 mm QFN packages and operates over a -40 to 125 degrees C operating junction temperature range with the 1000-piece price starting at 3.71 US Dollars each. Both versions are available from stock.
Automotive electronics complexity at tipping point, study warns
August 04, 2015
Features and functions are added at rapid pace to new cars. Typically, the E/E engineers add a dedicated electronic control ...
Phone batteries leak your browsing whereabouts
NASA preps Venus ICs
'Aqueous solar flow' battery lasts longer
Google 'Street View' cars add sensors to map air quality
CoolCube circuit stacking moves to FinFET process
August 03, 2015
The CEA-Leti research laboratory at Grenoble France, has reported that its CoolCube 3D interconnect technology is suitable ...
Is NextInput next winner in Apple products?
Fraunhofer rolls security platform for cars
The Filter Wizard: When off the shelf won't do, Part 1
- Dual Phase Buck Controller Drives High Density 1.2V/60A Supply with Submilliohm DCR Sensing
- Test environment for the positioning elements of wearable devices
- Automotive Circuit Protection using Littelfuse Automotive TVS Diodes
- Top 5 Challenges for testing Today's Consumer Electronics
InterviewGlobalfoundries' CEO on why FD-SOI and why now
With its latest news Globalfoundries Inc. has not only confirmed itself as a supporter of the fully-depleted silicon-on-insulator (FD-SOI) approach to IC manufacturing but that it also thinks sufficiently ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Novelda is giving away two full XeThru Inspiration kits worth 1499 US Dollars each, for EETimes Europe's readers to experiment first hand with its XeThru technology.Based on the use of radio waves, rather than infrared, ultrasound or light, the company's X2M1000 Inspiration modules can detect presence just from the chest movement while breathing, and measure both the rate and... MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.