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Ultralow DCR sensing makes for higher efficiency in LTC7130

Posted: 31 Mar 2016 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous step-down DC/DC converter? monolithic? switching jitter? ultralow DCR current sensing?

Linear Technology's latest monolithic synchronous step-down regulator features a temperature-compensated ultralow DCR current sensing that maximises efficiency in high-current applications. The LTC7130 bears a unique architecture that eases compensation and offers the ability to directly parallel multiple ICs for higher current capability.

The constant frequency peak current mode synchronous step-down DC/DC converter also has clock synchronisation and enhances the signal-to-noise ratio of the current sense signal, enabling the use of a very low DC resistance power inductor to maximise efficiency. This feature also reduces the switching jitter commonly found in low DCR applications and improves current limit accuracy.

Linear LCT7130

Figure 1: 20VIN, 20A Monolithic Synchronous Buck Converter with Differential Output Sensing

Enabling a wide variety of applications

The LTC7130's 4.5V to 20V input range supports a wide variety of applications, including most intermediate bus voltages, and is compatible with many battery types. Integrated N-channel MOSFETs can deliver continuous load currents as high as 20A at output voltages ranging from 0.6V to 5.5V, making it ideal for point-of-load applications such as high current / low voltage DSP / FPGA / ASIC reference designs. Other applications include telecom/datacom systems, distributed power architectures and general high power density systems.

Demo board

The LTC7130 has a nice demo board, the DC2341A. See the 20A buck below with m? inductor DCR sensing with an input range of 4.5V to 20V and a Vout of 1.5V@20A.


Figure 2: The LTC7130's demo board, the DC2341A.

Thermal performance

The DC2341A demo board has a really good thermal design. See figure below.

load Rboost

Figure 3: The DC2341A demo board design

Thermal derating

Figure 3: Thermal derating has been shown to be excellent both with and without airflow and heatsinks.

Package, grades and pricing

The IC is available in a thermally-enhanced 6.25?7.5?2.22mm BGA package, with both RoHS lead-free and leaded SnPb (63/37) finishes. The E-and I-grades are guaranteed from 40C to 125C operating junction temperature range. The 1,000-piece price starts at $7.95 each for the E grade (Pricing is for budgetary use only and may differ due to local duties, taxes, fees and exchange rates.)

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