EVB-EN6347QI: 1 ~ 2.25V @ 4A, 2.5 ~ 6.6V in, Buck


This evaluation board user guide applies to two products with identical pinouts: The EN6337QI is a 3A device, and the EN6347QI is a 4A device. The term EN63x7QI will refer to both products throughout this document. This evaluation board user guide applies to the EN63x7-03 engineering devices. In addition to this document, you will also need the latest device datasheet.

The EN63x7QI features integrated inductor, power MOSFETS, controller, a bulk of the compensation network, and protection circuitry against system faults. This level of integration delivers a substantial reduction in footprint and parts count over competing solutions. The evaluation board is optimized for engineering ease of testing through programming options, clip leads, test points etc.

The EN63x7QI features a customer programmable output voltage by means of a resistor divider. The resistor divider allows the user to set the output voltage to any value within the range 0.75V to (VIN-VDROPOUT). The evaluation board, as shipped is populated with a 4 resistor divider option. The upper resistor is fixed and has a phase lead capacitor in parallel. One of the 4 lower resistors is selected with the jumper option for different output voltages to change VOUT, retain the upper resistor and capacitor values and change only the lower resistor.

This device has no over-voltage protection feature. We strongly recommend the customer to ensure the feedback loop is truly closed before powering up the device especially if the load can not withstand the input voltage.

The input and output capacitors are X5R or X7R multi-layer ceramic chip capacitors. The Soft-start capacitor is a small 15nF X7R MLCC. Pads are available to have multiple input and output capacitors. This allows for evaluation of performance over a wide range of input/output capacitor combinations.

Clip-on terminals are provided for ENA, SS, POK, and LLM pins.

Banana jacks are provided for VIN and VOUT power terminals. Several signal and GND clip-on test points are also provided to measure VIN, VOUT, and GND nodes.

A jumper is provided for controlling the Enable signal. Enable may also be controlled using an external switching source by removing the jumper and applying the enable signal to the ENA clip-on terminal.

A jumper is also provided to connect the POK pull-up resistor to the input supply. This jumper is especially useful to measure the disable current and eliminates having to subtract the current drawn by the POK resistor.

A jumper is provided for controlling the LLM/SYNC pin. This pin can be high for automatic LLM (light-load mode) operation. If it is pulled low, the part will be in PWM mode only.

Foot print is also provided for a SMA connector to LLM/SYNC input. A switching input to this pin allows the device clock to be phase locked to an external signal. This external clock synchronization allows for moving any offending beat frequency to be moved out-of-band. A swept frequency applied to this pin results in spread spectrum operation and reduces the peaks in the noise spectrum of emitted EMI.

The board comes with input decoupling and reverse polarity protection to guard the device against common setup mishaps.


Manufacturer Intel
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number 544-2892-ND
Eval Board Supplier Intel
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 1 V
1.2 V
1.55 V
2.25 V
Current Out 4 A
Voltage In 2.5 ~ 6.6 V
Efficiency @ Conditions >91%, 5V in, 3.3V @ 1 ~ 4 A
>90%, 3.3V in, 2.5V @ 0.3 ~ 4 A
>89%, 5V in, 2.5V @ 1 ~ 4 A
>88%, 3.3V in, 1.8V @ 0.3 ~ 4 A
>86%, 3.3V in, 1.5V @ 0.7 ~ 4 A
>85%, 5V in, 1.8V @ 1 ~ 4 A
>83%, 5V in, 1.5V @ 1 ~ 4 A
>83%, 3.3V in, 1.2V @ 0.5 ~ 4 A
>81%, 5V in, 1.2V @ 1.1 ~ 4 A
>81%, 3.3V in, 1.0V @ 0.7 ~ 4 A
>80%, 5V in, 1.0V @ 1.0 ~ 3.8 A
Voltage Out Range 0.75 ~ 6 V
Features Internal Inductor
Light Load Mode
Over Current Protection
Short Circuit Protection
Shutdown, Enable, Standby
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 3 MHz
Standby Current [Typical] 100 µA
Quiescent Current [Typical] 650 µA
Component Count + Extras 19 + 22
Internal Switch Yes
Design Author Altera
Application / Target Market Computers
Factory Automation
FPGA / DSP / Processors
Point of Load (PoL)
Power: Auxiliary Power Supply
Standby Current [Maximum] - Not Given
Quiescent Current [Maximum] - Not Given
Main I.C. Base Part EN6347QI
Date Created By Author 2013-10
Date Added To Library 2017-06

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