FPGA development board, as well as prototype design, testing and measurement applications require multi-function high-density power solutions. LTM4678 is a 16 mm x 16 mm small size dual 25 a or single circuit 50 a? Module? Voltage regulator with digital power system management (PSM) function. The device has:
Dual digital adjustment analog loops and a digital interface for controlling and monitoring.
Wide input voltage range: 4.5 V to 16 V
Wide output voltage range: 0.5 V to 3.3 V
The maximum DC output error ± 5% of the maximum DC output error of ± 5% in the entire temperature range
Current detection below 1 MΩ DCR
Integrated input current detection amplifier
400 kHz PMBUS compatible I2C serial interface
Support for remote sampling polling rates up to 125 Hz
An integrated 16-bit σ-Δ ADC
Constant frequency current mode control
The balanced current capacity can be used in parallel
16 mm × 16 mm × 5.86 mm COP-BGA package
I2C-based PMBUS interface and programmable loop compensation
LTM4678 belongs to the ADI's Power System Management (PSM) "Module series, can be configured and monitored via a PMBUS / SMBUS / I2C digital interface. PC-based LTPowerPLAY® tool enables visual monitoring and control of power supply voltage, current, electricity, sorting, margin adjustment, and fault record data. The LTM4678 is the first? Module regulator with programmable loop compensation (GM and RTH), greatly shortening design time because dynamic performance tuning does not need to be built or modifying the PCB board.
A COP-BGA package for achieving improvement in thermal performance, small size and high power density is encapsulated by heat resistance reinforced built-in assembly (COP) BGA package, high-power LTC4678 at 16 mm x 16 mm small size PCB space. The inductor uses a stacked design and is used as a radiator to effectively reduce the circuit board temperature.
Use current mode control to easily adjust to higher current
The LTM4678 is controlled by peak current mode. Monitor and control current progressively. Thereby achieving a current flow in a multi-phase consolidated application.
Other unique features
In high current applications, the distal dual output detects the voltage drop on the traveler.
The maximum ± 0.5% DC output error in the temperature range provides additional adjustment margin Direct input current detection Measuring accurate input current and power When the output voltage is within the adjustment range, the dedicated PGOOD pin provides a signal of the downstream system.
In the case of high VIN, the EXTVCC pin can maximize the efficiency dual output converter (1 V / 25 A and 1.8 V / 25 a)
Figure 1 shows a typical 5.75 V to 16 V input, dual output solution. The two channels of the LTM4678 operate at a relative phase shift of 180 °, thus reducing the input RMS current ripple and capacitor dimensions.
MODULE Series High Density Power Supply Solution Figure 1.1 V / 25 A and 1.8 V / 25 A Output (with I2C Serial Control and Monitoring Interface).
As shown in Figure 2, in the forced continuous current mode (CCM), the overall solution efficiency is 85.8% (1.0 V / 25 A output) and 90.4% (1.8 V / 25 a).
Figure 3 shows the thermal performance of the LTM4678 in VIN = 12 V, Vout0 = 1.0 V / 25 a, and VOUT1 = 1.8 V / 25 a and 200 LFM. The hotspot (in the case on CH1) is temperature rise to 63 ° C, and the ambient temperature at this time is about 24 ° C.
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Polyphase, single output high current (12 V to 1 V / 250 a) The LTM4678 can be configured as a multi-phase output converter to constitute a higher current solution. Figure 4 shows a block diagram connected to a plurality of LTM4678. To increase the output current, simply add additional LTM4678 and connect their respective VIN, VOUT, VOSNS +, VOSNS?, PGOOD, COMPA / B, RUN, FAULT, SYNC, and GND pins.
What is a programmable loop compensation function? Module Series High Density Power Supply Solution Figure 4. Block diagram showing the simplicity of multi-phase operation.
Figure 5 shows that when it is connected to 5 LTM4678 (10 phases), the current supplied per phase. The maximum current difference between 10 phases is 0.75 a (based on 25 A calculation is 3%), which represents a balanced basis.
MODULE series high-density power solutions with programmable loop compensation features Figure 5.5 Bound between LTM4678 devices (10-phase pair).
Figure 6 shows a thermal image map of 5 parallel LTM4678 (in the case where 220 A outputs and applied 450 LFM airflows). The maximum temperature difference between the Module regulator is 10 ° C. Figure 7 shows a complete schematic of an 8-phase solution.
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6. Thermality of the multiphase converter
MODULE Series High Density Power Supply Solution Figure 7. Using the 8-phase operation of four LTM4678 (generating 1 V / 200 A output).
in conclusion
LTM4678? Module is a universal high-performance power solution with small-panel area (16 mm x 16 mm) that provides high efficiency and high power. Small size and simple and easy-to-use features make LTM4678 ideal for space-limited design, such as FPGA development boards. For telecommunications and data communication systems and applications where higher currents are required in industrial and computer system applications, multiple LTM4678 can be performed in parallel to perform multi-phase operations.
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Reprinted from -Wiku Electronic Market Network
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