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ISL8024DEMO2Z User Guide

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ISL8024DEMO2Z User Guide User’s Manual ISL8024DEMO2Z A Power Module for Xilinx RFSoC Applications Demonstration Board Industrial Analog and Power Rev.1.00 Mar 2019 USER’S MANUAL ISL8024DEMO2Z UG187 Demonstration Board Rev.1.00 Mar 5, 2019 1. Overview The ISL8024DEMO2Z is a low-noise power module to power the high-speed data converters on Xilinx RFSoCs. It is used as a power module that plugs into an application board. 1.1 Key Features • Three input voltage sources: 5.0V, 3.3V, and 1.8V • Five output voltages: ADC_AVCC, ADC_AVCCAUX, DAC_AVCC, DAC_AVTT, and DAC_AVCCAUX • PMBus interface that can digitally control the voltage set-point and margining of the DAC_AVTT rail • All rails have differential point-of-load voltage sensing • Additional low-pass filter to reduce output voltage ripple related to the switching regulator while maintaining high efficiency 1.2 Specifications Table 1. Specifications Typical Voltage Voltage Set-Point Accuracy Adjustment Range Maximum Current Rail (V) (%) (V) (A) ADC_AVCC 0.925 ±1 0.70 to 1.16 2.0 ADC_AVCCAUX 1.8 ±1 1.35 to 2.25 2.0 DAC_AVCC 0.925 ±1 0.70 to 1.16 3.5 DAC_AVCCAUX 1.8 ±1 1.35 to 2.25 2.0 DAC_AVTT 2.5 and 3.0 ±1 1.88 to 3.75 2.0 1.3 Ordering Information Part Number Description ISL8024DEMO2Z ISL8024 demonstration board 1.4 Related Literature For a full list of related documents, visit our website: • ISL8024, ISL28191 device pages UG187 Rev.1.00 Page 2 of 17 Mar 5, 2019 ISL8024DEMO2Z 2. Functional Description 2. Functional Description Overall system power blocks are shown in Figure 1. The 1.8V and 2.5V output voltage is derived from 5V, and the 0.925V rails are derived from 3.3V. Each rail is followed by an additional LC filter to reduce output voltage ripple. 3.3V ADC_AVCC ISL8024 LP Filter Input 0.925V 5V ADC_AVCCAUX ISL8024 LP Filter Input 1.8V 3.3V DAC_AVCC ISL8024 LP Filter Input 0.925V 5V DAC_AVCCAUX ISL8024 LP Filter Input 1.8V 5V DAC_AVTT ISL8024 LP Filter Input 2.5/3.0V Figure 1. Simplified Block Diagram of the ISL8024DEMO2Z Power Module Board Based on the specification, the ISL8024 is used as the DC/DC converter solution and as the main component. The ISL8024 has ±0.8% VFB tolerance across the temperature range of -40°C to +85°C. It has a programmable switching frequency up to 2MHz to reduce the size of the LC filters. To further reduce the output voltage ripple, a 2nd stage LC filter is used after the LC filter for the buck regulators. To reduce the conductor trace voltage drop related to the board connectors and to achieve the best load point voltage regulation, a remote sense scheme is used with the ISL28191 as a differential amplifier. Reduce the EMI to the upstream converters, a dedicated LC filter is also used as the input filter for each rail. An example power block and its related schematics is shown in Figure 2, demonstrating the device components. Figure 2. Single Rail Power Block UG187 Rev.1.00 Page 3 of 17 Mar 5, 2019 ISL8024DEMO2Z 2. Functional Description Low-pass filter design requires a balance between phase loss and VOUT ripple attenuation. The LC filter used in Figure 2 has about 40dB noise attenuation at 2MHz and a phase drop of 20° at 100kHz as shown in Figure 3. The compensation design of the ISL8024 regulator has been tuned to accommodate this phase loss. (dB) dB(L1-N)-dB(V1-pos) Frequency (Hz) Figure 3. 2nd Stage LC Filter Characteristics 2.1 Quick Start Guide The ISL8024DEMO2Z board can be powered on or off with external connectors, or plugged into Xilinx application boards. UG187 Rev.1.00 Page 4 of 17 Mar 5, 2019 ISL8024DEMO2Z 3. PCB Layout Guidelines 3. PCB Layout Guidelines 3.1 ISL8024DEMO2Z Demonstration Board Figure 4. ISL8024DEMO2Z Demonstration Board (Bottom) Figure 5. ISL8024DEMO2Z Demonstration Board (Top) UG187 Rev.1.00 Page 5 of 17 Mar 5, 2019 Mar 5,2019 Mar UG187 Rev.1.00 ISL8024DEMO2Z Guidelines 3.PCBLayout 3.2 ISL8024DEMO2Z Circuit Schematic J1 1 2 3 GND1 GND2 4 J2 ADC_AVCC_CS_P 5 ADC_AVCC_CS_P ADC_AVCC_VS_P 6 ADC_AVCC_VS_P ADC_AVCC_CS_N 7 ADC_AVCC_CS_N ADC_AVCC_VS_N 8 ADC_AVCC_VS_N VCC5V0 1 2 9 GND7 GND8 10 VCC3V3 3 4 DAC_AVCC_CS_P 11 DAC_AVCC_CS_P DAC_AVCC_VS_P 12 DAC_AVCC_VS_P VCC1V8 5 6 DAC_AVCC_CS_N 13 DAC_AVCC_CS_N DAC_AVCC_VS_N 14 DAC_AVCC_VS_N VCC3V3 7 8 15 GND13 GND14 16 VCC1V8 9 10 VCC1V8 ADC_AVCCAUX_CS_P 17 ADC_AVCCAUX_CS_P ADC_AVCCAUX_VS_P 18 ADC_AVCCAUX_VS_P ADC_AVCCAUX_CS_N 19 ADC_AVCCAUX_CS_N ADC_AVCCAUX_VS_N 20 ADC_AVCCAUX_VS_N 21 GND19 GND20 22 DAC_AVTT_CS_P 23 DAC_AVTT_CS_P DAC_AVTT_VS_P 24 DAC_AVTT_VS_P DAC_AVTT_CS_N 25 DAC_AVTT_CS_N DAC_AVTT_VS_N 26 DAC_AVTT_VS_N 27 GND25 GND26 28 DAC_AVCCAUX_CS_P 29 DAC_AVCCAUX_CS_P DAC_AVCCAUX_VS_P 30 DAC_AVCCAUX_VS_P DAC_AVCCAUX_CS_N 31 DAC_AVCCAUX_CS_N DAC_AVCCAUX_VS_N 32 DAC_AVCCAUX_VS_N 33 GND31 GND32 34 35 NC_1 NC_2 36 37 GND35 GND36 38 J3 39 RSVD_1 RSVD_2 40 41 GND39 GND40 42 1 2 43 RSVD_3 RSVD_4 44 ADC_AVCC 3 4 45 GND43 GND_44 46 DAC_AVCC 5 6 47 RSVD_5 RSVD_6 48 DAC_AVCCAUX 7 8 49 GND47 GND48 50 ADC_AVCCAUX 9 10 51 RSVD_7 RSVD_8 52 DAC_AVTT 53 GND51 GND52 54 DAC_AVCC_PGOOD 55 DAC_AVCC_PGOOD ALT_PMBUS_ADDR0 56 ALT_PMBUS_ADDR0 DAC_AVTT_PGOOD 57 DAC_AVTT_PGOOD ALT_PMBUS_ADDR1 58 ALT_PMBUS_ADDR1 DAC_AVCCAUX_PGOOD 59 DAC_AVCCAUX_PGOOD RSVD_9 60 ADC_AVCC_PGOOD 61 ADC_AVCC_PGOOD PMBUS_ALERT 62 PMBUS_ALERT ADC_AVCCAUX_PGOOD 63 ADC_AVCCAUX_PGOOD GND62 64 65 GND63 PMBUS_DATA 66 PMBUS_DATA 67 GND65 GND66 68 69 GND67 PMBUS_CLK 70 PMBUS_CLK POR_B POR_B GND70 J4 2 1 4 3 PMBUS_DATA 6 5 PMBUS_CLK 8 7 PMBUS_ALERT Figure 6. ISL8024DEMO2Z Schematics, Page 1 Page 6 of 17 Mar 5,2019 Mar UG187 Rev.1.00 ISL8024DEMO2Z Guidelines 3.PCBLayout L1 VCC3V3 1 2 110nH C1 R1 C2 22uF DNP 1uF 2 16 1 0 Ohm Resistor 13 L3 L4 L2 R3 5 14 1 2 1 2 1 2 POR_B VIN EN VDD VIN1 15 ADC_AVCC 0 96.5k 680nH 50nH R2 6 PHASEPHASEPHASE C6 FS C7 U1 10uF R4 R5 0.925V 1uF C3 7 9 100mohm 100mohm C10 C8 SS FB (0.70V-1.16V) ISL8024 C4 C5 10uF 0.1uF DNP C12 C13 2A R6 10 C9 22uF 22uF R7 22uF 22uF 0 SGND 8 C15 C16 4 COMP C14 SYNC 24.9k 47uF 47uF C11 3 180pF 0.1uF PG 1uF EPAD PGND PGND C17 10p 17 12 11 R8 R10 VCC3V3 DNP DNP C18 R9 R11 DNP C21 0.1uF 100 C19 10nF C20 DNP DNP 6 R12 R13 2k 2k + 3 1 ADC_AVCC_VS_P 4 U2 - R14 ADC_AVCC_VS_N ISL28191 536 R15 ADC_AVCC_PGOOD 5 2 2k R16 R17 100 1k R18 R19 2k DNP R20 ADC_AVCC_CS_P DNP C22 C122 ADC_AVCC_CS_N DNP C23 DNP C24 DNP DNP C25 VCC5V0 DNP C26 19 21 20 23 22 24 R22 DNP R21 DNP NC3 DNP VINP 1 VINM 18 NC1 VBUS VCC 2 VREG_IN 17 GND1 I2CVCC VREG_OUT 3 16 AUXP U3 A2 ALT_PMBUS_ADDR0 4 DNP 15 AUXM A1 R24 R25 5 14 DNP DNP AUXV A0 6 GND2 13 DAC_OUT L5 EXT_CLK VCC5V0 1 2 SMBCLK SMBDAT NC2 SMBALERT1 SMBALERT2 EPAD 50nH C27 7 8 9 12 R27 10 11 25 C28 22uF DNP 1uF PMBUS_ALERT PMBUS_DATA 2 16 1 13 L6 L7 PMBUS_CLK R28 5 14 1 2 1 2 POR_B VIN EN VDD VIN1 15 ADC_AVCCAUX 0 133k 680nH 50nH C33 R29 6 PHASEPHASEPHASE C31 C32 FS C30 C34 0.1uF 1.8V U4 10uF R30 1uF 22uF 22uF C29 7 9 100mohm (1.35V-2.25V) SS FB ISL8024 C36 C37 2A DNP 10 C35 1uF 0.1uF SGND 8 R32 C38 C39 R31 0 4 COMP 22uF DNP C40 SYNC 24.9k 47uF 3 180pF PG EPAD PGND PGND C41 10P 17 12 11 R34 VCC3V3 DNP C42 R33 R35 DNP C44 100nF 100 2.7nF C43 DNP 6 R36 R38 3 2k 2k + 1 ADC_AVCCAUX_VS_P 4 U5 - R37 ADC_AVCCAUX_VS_N ISL28191 2k R39 ADC_AVCCAUX_PGOOD 5 2 2k R40 R41 100 1k R42 R43 2k DNP R44 ADC_AVCCAUX_CS_P DNP C45 DNP ADC_AVCCAUX_CS_N C123 DNP C46 C47 DNP DNP C48 DNP VCC5V0 C49 R45 19 22 24 21 20 23 DNP DNP NC3 1 VINP 18 VINM NC1 VBUS VCC 2 VREG_IN 17 R48 GND1 I2CVCC VREG_OUT DNP 3 U6 16 AUXP A2 4 DNP 15 AUXM A1 5 14 AUXV A0 6 GND2 13 DAC_OUT Page 7 of 17 R49 R46 R73 EXT_CLK DNP DNP SMBDAT NC2 SMBALERT1 SMBALERT2 EPAD SMBCLK DNP Title 8 9 7 10 11 25 12 PMBUS_ALERT PMBUS_DATA Size PMBUS_CLK C Date: Figure 7. ISL8024DEMO2Z Schematics, Page 2 Mar 5,2019 Mar UG187 Rev.1.00 ISL8024DEMO2Z Guidelines 3.PCBLayout L8 VCC3V3 1 2 110nH C50 R51 C51 22uF DNP 1uF 2 16 1 13 L9 L10 L11 R52 5 14 1 2 1 2 1 2 POR_B VIN EN VDD VIN1 15 DAC_AVCC 0 111k 680nH 50nH 0 Ohm Resistor C58 R53 6 PHASEPHASEPHASE C55 C56 C57 FS C53 C54 0.1uF 0.925V U7 10uF R54 10uF R55 1uF 22uF 22uF C52 7 9 100mohm 100mohm (0.70V-1.16V) SS FB ISL8024 C60 C61 3.5A DNP R56 10 C59 1uF 0.1uF R57 C62 C64 0 SGND 8 4 COMP 22uF 22uF C63 C65 SYNC 32.4K 47uF 47uF 3 180pF PG EPAD PGND PGND C66 DNP 17 12 11 R58 R59 VCC3V3 DNP DNP C67 R61 R60 100nF DNP C70 100 10nF C68 C69 DNP DNP 6 R62 R64 2k 2k + 3 1 DAC_AVCC_VS_P 4 U8 - R63 DAC_AVCC_VS_N ISL28191 536 R65 DAC_AVCC_PGOOD 5 2 2k R66 R67 100 1k R68 R70 2k DNP R69 DAC_AVCC_CS_P DNP C71 DNP C124 DAC_AVCC_CS_N DNP C73 C72 DNP DNP VCC5V0 C74 C75 21 20 22 24 19 DNP 23 R71 DNP DNP NC3 1 VINP 18 VINM NC1 VBUS VCC 2 VNEG_IN 17 GND1 I2CVCC R74 VREG_OUT DNP 3 U9 16 AUXP A2 4 DNP 15 AUXM A1 5 14 AUXV A0 6 13 DAC_OUT GND2 R75 DNP R72 R50 SMBCLK SMBDAT NC2 SMBALERT1 SMBALERT2 EXT_CLK EPAD DNP DNP L12 1 2 7 8 9 VCC5V0 10 11 12 25 50nH C76 R77 C77 PMBUS_ALERT DNP 22uF 1uF PMBUS_DATA 2 16 1 13 L13 L14 PMBUS_CLK R78 5 14 1 2 1 2 POR_B VIN EN VDD VIN1 15 DAC_AVCCAUX 0 96.5k 680nH 50nH C83 R79 6 PHASEPHASEPHASE C81 C82 FS C79 C80 0.1uF U10 10uF R81 1uF 1.8V 22uF 22uF C78 7 9 100mohm SS FB (1.35V-2.25V) ISL8024 C85 C86 DNP 2A R82 10 C84 1uF 0.1uF SGND R83 C88 0 8 C87 COMP 22uF C90 4 22uF 24.9k 47uF SYNC 3 180pF PG EPAD PGND PGND C91 10p 17 12 11 R85 VCC3V3 DNP C92 R84 R86 100nF DNP C94 100 2.7nF C93 DNP 6 R87 R88 2k 2k + 3 1 DAC_AVCCAUX_VS_P 4 U11 - R89 DAC_AVCCAUX_VS_N ISL28191 2k R90 DAC_AVCCAUX_PGOOD 5 2 2k R91 R92 1k 100 R93 R95 2k R94 DNP DAC_AVCCAUX_CS_P DNP C95 DAC_AVCCAUX_CS_N C125 DNP C96 DNP DNP C97 DNP C98 VCC5V0 21 24 20 22 23 DNP 19 C99 DNP R96 R117 NC3 DNP 1 VINP 18 VINM DNP NC1 VBUS VCC 2 VREG_IN 17 GND1 I2CVCC VREG_OUT 3 U12 16 AUXP A2 DNP 4 15 AUXM A1 ALT_PMBUS_ADDR1 5 14 AUXV A0 6 GND2 13 DAC_OUT R99 R100 DNP EXT_CLK DNP Page 8 of 17 SMBCLK SMBDAT NC2 SMBALERT1 SMBALERT2 EPAD 7 8 9 Title 10 11 25 12 PMBUS_ALERT Size PMBUS_DATA C PMBUS_CLK Date: Figure 8.
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