ANALOG DEVICES LTM4710-1 Low VIN Quad 8A Silent Switcher User Manual
- June 16, 2024
- Analog Devices
Table of Contents
ANALOG DEVICES LTM4710-1 Low VIN Quad 8A Silent Switcher User Manual
DEMO MANUAL DC3164A-B
LTM4710-1
Low VIN, Quad 8A Silent Switcher µModule Regulator
DESCRIPTION
Demonstration circuit 3164A-B features the LTM®4710-1, a quad DC/DC step-down µModule® regulator with 8A per output, packaged in a compact (6mm × 12mm × 3.54mm) land grid array (LGA) with pre-made solder balls. DC3164A-B has an operating input range of 2.5V to 5.5V. The outputs of the four channels are 0.8V, 1.0V, 1.2V, and 1.5V with 8A per output, respectively. All outputs voltages are programmable from 0.5V up to 3.6V (step-down only). DC3164A-B operates by default at 1.5MHz and can be adjusted by an external resistor from 1MHz to 5MHz or by being synchronized to an external clock from 1.2MHz to 2.6MHz. DC3164A-B also allows for the channels to be paralleled up to 32A load current.
LTM4710-1 integrates four separate constant-frequency peak current mode control regulators, power MOSFETs, inductors, and other supporting discrete components. It employs the second-generation Silent Switcher® technologyin which it allows fast switching edges for high efficiency at high switching frequencies, while simultaneously achieving good EMI performance. Refer to the LTM4710-1 data sheet for more detailed information.
It is recommended to read the data sheet of the LTM4710-1 prior to making any changes to the DC3164A-B board.
Design files for this circuit board are available.
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BOARD PHOTO
Part marking is either ink mark or laser mark
PERFORMANCE SUMMARY
Specifications are at T A = 25°C, no forced-air cooling
QUICK START PROCEDURE
Demonstration circuit 3164A-B is easy to set up to evaluate the performance of the LTM4710-1. See Figure 1 for the proper measurement equipment setup and follow the procedure below.
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With power off, place the jumpers as shown in the following positions.
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With power off, (see Figure 1), connect the input power supply between VIN and GND. Connect the output loads between VOUT1 and GND, VOUT2 and GND, VOUT3 and GND, and VOUT4 and GND, respectively.
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Connect the DMMs to the input and outputs.
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Turn on the input power supply.
NOTE: The input voltage should be between 2.5V and 5.5V. -
Check for the proper output voltages. The output voltage meters for each channel should display the programmed output voltages (VOUT1 = 0.8V, VOUT2 = 1.0V, VOUT3 = 1.2V, VOUT4 = 1.5V) within ±1.5%.
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Once the input and output voltages are properly established, adjust the load current within the operating range of 0A to 8A max for each channel. Observe the output voltage regulation, output voltage ripples, load transient response and other parameters.
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Vary the input voltage from 2.5V to 5.5V. Observe the output voltage regulation.
NOTE: When measuring the output or input voltage ripple, do not use the long ground lead on the oscilloscope probe. See Figure 2 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead.
OPTIONAL: An input EMI filter is included on the board. To include this filter, connect the input supply positive terminal to VEMI. Connect the input positive supply to VIN to exclude the input EMI filter.
MULTIPHASE CONFIGURATION
For output loads that demand more than 8A of current, multiple LTM4710-1 channels can be paralleled to run out of phase to provide more output current without increasing input and output voltage ripples. Figure 3 shows the typical paralleled application where channel 1 is used as the main channel and the rest of LTM4710-1 channels are programmed as the subordinary channels to achieve the same switching frequency, interleaved phase shift and current sharing among different channels.
The RT pin of the main phase is connected to a resistor to AGND, programming the frequency and configuring the MODE pin to become clock output used to drive the MODE pin of the subordinary phase(s).
Connecting the FB pin to VIN configures a phase as a subordinary phase. The MODE becomes an input, and the voltage control loop is disabled. The subordinary phase current control loop is still active, and the peak current is controlled via the shared COMP node. The phase shift of a subordinary phase relative to the main phase is programmed with a resistor divider on the RT pin. Refer to the LTM4710-1 data sheet for more detailed information.
TYPICAL PERFORMANCE CHARACTERISTICS
PARTS LIST
SCHEMATIC DIAGRAM
REVISION HISTORY
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and
circuit boards can discharge without detection. Although this product features
patented or proprietary protection circuitry, damage may occur on devices
subjected to high energy ESD. Therefore, proper ESD precautions should be
taken to avoid performance degradation or loss of functionality.
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Rev. 0
07/23
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