Reference Circuit 6322

Remote Radio Head Power Supplies



This design provides all the power-supply rails and power sequencing necessary to power Xilinx™ ZU9/15 Remote Radio Head power supplies. The module accepts 12V input voltage and generates eleven power rails. The VCCPINT output is set to 0.85V with 3A output current capability by using the MAX15303 step-down switching regulator. The VCCINT output is set to 0.72V with 20A output current capability by using the MAX20743 PMBus™ step-down switching regulator. Both VMGTAVCC and VMGTAVTT output voltages are generated from the MAX17509 dual step-down regulator. VMGTAVCC is set to 0.9V with 2A capability and the VMGTAVTT is set to 1.2V with 2A current capability. Both VMGTAVCC and VMGTAVTT output voltages have less than 10mV output ripple, which meet the ripple requirements. Another MAX17509 IC generates the VAUX and VCCODDR output voltages. VAUX is capable of delivering 1A at 1.8V and VCCODDR is capable of delivering 3A at 1.2V. The MAX17541G generates the VCCOPIO output voltage. VCCOPIO is capable of delivering 0.5A at 3.3V. Another MAX17541G IC generates the VMGTAVCCAUX output voltage. VMGTAVCCAUX is capable of delivering 0.5A at 1.8V and have less than 10mV output ripple. The MAX8869 generates the VPP output voltage. VPP is capable of delivering 0.1A at 2.5V. The MAX17510 generates the VTT and VREFCA output voltages. VTT is capable of delivering 1A at 0.6V and VREFCA is capable of delivering 0.005A at 0.6V.

The power module provides extremely compact, high-efficiency power solutions with high-precision output voltages and excellent transient response.

Features

  • InTune™ Digital PoL SMPS MAX15303
    • 600kHz Switching Frequency
    • 12V Input Voltage
    • 0.85V at 3A (VCCPINT)
  • Integrated Buck Regulator SMPS MAX20743
    • 400kHz Switching Frequency
    • 12V Input Voltage
    • 0.72V at 20A (VCCINT), 10mV ripple
  • Dual Buck Regulator SMPS MAX17509
    • 1MHz Switching Frequency
    • 12V Input Voltage
    • 0.9V at 2A (VMGTAVCC), 10mV ripple
    • 1.2V at 2A (VMGTAVTT), 10mV ripple
  • Dual Buck Regulator SMPS MAX17509
    • 1MHz Switching Frequency
    • 12V Input Voltage
    • 1.8V at 1A (VAUX)
    • 1.2V at 3A (VCCODDR)
  • Buck Regulator SMPS MAX17541G
    • 600kHz Switching Frequency
    • 12V Input Voltage
    • 3.3V at 0.5A (VCCOPIO)
  • Buck Regulator SMPS MAX17541G
    • 600kHz Switching Frequency
    • 12V Input Voltage
    • 1.8V at 0.5A (VMGTAVCCAUX)
  • Linear Regulator MAX8869
    • 3.3V Input Voltage
    • 2.5V at 0.1A (VPP)
  • DDR Linear Regulators MAX17510
    • 1.2V Input Voltage
    • 0.6V at 1A (VTT)
    • 0.6V at 0.005A (VREFCA)
Diagram Enlarge+

VCCINT (0.72V) Output:

The MAX20743 step-down regulator accepts 12V input and generates 0.72V output with 20A current capability. The switching frequency is set to 400kHz. The output voltage is set by resistors R104 (1.27k) and R105 (11.5k). The output voltage can be changed by changing R104 and R105. Refer to the Output-Voltage Setting section of the MAX20743 data sheet. The output voltage, switching frequency, and current limit can also be monitored and programmed using a PMBus serial connection using Maxim's PowerTool™ software. This gives the user the ability to margin their designs during operation.

This regulator includes overcurrent (OCP) and overtemperature protection (OTP). It has 0.04% load regulation at full load and excellent transient response.

VCCINT Switching Frequency

Figure 01.

VCCINT Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 0.7209 0.13
20 0.7209 0.13

VCCINT Transient Response (1A to 10A load)

Figure 02.

VCCINT Output Ripple (20A load)

Figure 03.

VCCPINT (0.85V) Output:

The MAX15303 step-down regulator accepts 12V input and generates 0.85V output with 3A current capability. The switching frequency is set to 600kHz. The output voltage is set by resistor R203 (9.53k). The output voltage can be changed by changing R203. Refer to the Output-Voltage Setting section of the MAX15303 data sheett. The output voltage, switching frequency, and current limit can also be monitored and programmed using a PMBus serial connection using Maxim’s PowerTool™ software. This gives the user the ability to margin their designs during operation. This regulator includes overcurrent (OCP) and overtemperature protection (OTP). It has 0.35% load regulation at full load and excellent transient response.

VCCPINT Switching Frequency

Figure 04.

VCCPINT Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 0.848 0.24
3 0.848 0.35

VCCPINT Transient Response (1A to 3A load)

Figure 05.

VCCPINT Output Ripple (3A load)

Figure 06.

VMGTAVCC (0.9V) and VMGTAVTT (1.2V) Outputs:

The MAX17509 dual step-down regulator accepts 12V input and generates 0.9V and 1.2V outputs with 2A current capability for each output. The switching frequency is set to 1MHz. The 0.9V output voltage is set by resistors R310 (115k) and R311 (4.75k). The 1.2V output voltage is set by resistors R314 (6.81k) and R315 (75k). Both outputs can be changed by changing the feedback resistors. Refer to the Output-Voltage Setting section of the MAX17509 data sheet . The MAX17509 includes overcurrent (OCP) and overtemperature protection (OTP). It has excellent load regulation at full load and transient response. Both outputs have better than 10mV output ripple.

VMGTAVCC Switching Frequency

Figure 07.

VMGTAVCC Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 0.907 0.8
2 0.907 0.8

VMGTAVCC Transient Response (1A to 2A load)

Figure 08.

VMGTAVCC Output Ripple (2A load)

Figure 09.

VMGTAVTT Switching Frequency

Figure 10.

VMGTAVTT Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 1.201 0.1
2 1.201 0.1

VMGTAVTT Transient Response (1A to 2A load)

Figure 11.

VMGTAVTT Output Ripple (2A load)

Figure 12.

VAUX (1.8V) and VCCODDR (1.2V) Outputs:

The MAX17509 dual step-down regulator accepts 12V input and generates 1.8V and 1.2V outputs with 1A current capability for the 1.8V and 3A current capability for the 1.2V output. The switching frequency is set to 1MHz. The 1.8V output voltage is set by resistors R410 (40.2k) and R411 (11.8k). The 1.2V output voltage is set by resistors R414 (6.81k) and R415 (75k). Both outputs can be changed by changing the feedback resistors. Refer to the Output-Voltage Setting section of the MAX17509 data sheet. The MAX17509 includes overcurrent (OCP) and overtemperature protection (OTP). It has excellent load regulation at full load and transient response. Both outputs have better than 10mV output ripple.

VAUX Switching Frequency

Figure 13.

VAUX Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 1.792 0.45
1 1.791 0.5

VAUX Transient Response (0A to 1A load)

Figure 14.

VAUX Output Ripple (1A load)

Figure 15.

VCCODDR Switching Frequency

Figure 16.

VCCODDR Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 0.203 0.25
2 0.202 0.2

VCCODDR Transient Response (1A to 3A load)

Figure 17.

VCCODDR Output Ripple (3A load)

Figure 18.

VCCOPIO (3.3V) Output:

The MAX17541G step-down regulator accepts 12V input and generates 3.3V output with 0.5A current capability. The switching frequency is set to 600kHz. The output voltage is set by resistors R704 (48.7k) and R705 (18.2k). The output voltage can be changed by changing R704 and R705. Refer to the Output-Voltage Setting section of the MAX17541G data sheet . The MAX17541G includes overcurrent (OCP) and overtemperature protection (OTP). It has 0.1% load regulation at full load and excellent transient response.

VCCOPIO Switching Frequency

Figure 19.

VCCOPIO Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 3.304 0.13
0.5 3.301 0.1

VCCOPIO Transient Response (0A to 0.5A load)

Figure 20.

VCCOPIO Output Ripple (0.5A load)

Figure 21.

VMGTAVCCAUX (1.8V) Output:

The MAX17541G step-down regulator accepts 12V input and generates 1.8V output with 0.5A current capability. The switching frequency is set to 600kHz. The output voltage is set by resistors R503 (26.1k) and R504 (26.1k). The output voltage can be changed by changing R503 and R504. Refer to the Output-Voltage Setting section of the MAX17541G data sheet. The MAX17541G includes overcurrent (OCP) and overtemperature protection (OTP). It has 0.5% load regulation at full load and excellent transient response. Output has better than 10mV output ripple.

VMGTAVCCAUX Switching Frequency

Figure 22.

VMGTAVCCAUX Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 1.792 0.45
0.5 1.791 0.5

VMGTAVCCAUX Transient Response (0A to 0.5A load)

Figure 23.

VMGTAVCCAUX Output Ripple (0.5A load)

Figure 24.

VPP (2.5V) Output:

The MAX8869 linear regulator accepts 3.3V input and generates 2.5V output with 0.1A current capability. It has 0.8% load regulation at full load and excellent transient response. Output has better than 10mV output ripple.

VPP Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 2.5 0
0.1 2.49 0.8

VPP Transient Response (0A to 0.1A load)

Figure 25.

VPP Output Ripple (0.1A load)

Figure 26.

VTT (0.6V) and VREFCA (0.6V) Outputs:

The MAX17510 DDR linear regulator accepts 1.2V input and generates 0.6V output with 1A current capability and 0.6V output with 0.005A capability. VTT output has 0.5% load regulation at full load and excellent transient response. Output has better than 10mV output ripple.

VTT Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 0.602 0.33
1 0.597 0.5

VTT Transient Response (0A to 1A load)

Figure 27.

VTT Output Ripple (1A load)

Figure 28.

VREFCA Accuracy (at no load) and Load Regulation (at full load)

Load (A) VOUT (V) measured % error
0 0.6 0
0.005 0.58 3

VREFCA Output Ripple (0.005A load)

Figure 29.

Power Sequencing:

Power sequencing can be achieved using the power good and enable signals to sequence the output voltages. Output voltages VCCINT, VCCPINT and VMGTAVCC power up first, followed by VMGTAVTT, VAUX and VMGTAVCCAUX and VCCOPIO. An I2C, SMBus, or PMBus sequencer such as the MAX34440 can also be used for voltage monitoring and power sequencing.

Figure 30.

Figure 31.

Xilinx is a registered trademark and registered service mark of Xilinx, Inc.
InTune is a trademark of Maxim Integrated Products, Inc.
PMBus is a trademark of SMIF, Inc.
PowerTool is a trademark of Maxim Integrated Products, Inc.

 
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