MXL7225-EVK-2

Quad MxL7225 200A Multiphase EVK User Manual MaxLinear Confidential TBD/18 • www.maxlinear.com 021UMR01• 021UMR01 i Quad MxL7225 200A Multiphase EVK User Manual Revision History Revision History Document No. Release Date Change Description 021UMR01 12/7/20 Initial Release 12/7/20 021UMR01 ii Quad MxL7225 200A Multiphase EVK User Manual Table of Contents Table of Contents Introduction......................................................................................................................................................... 1 Quick EVK Set Up and Start Up ....................................................................................................................................1 Factory Settings ...................................................................................................................................................1 Quick Start Up ......................................................................................................................................................1 Reference Documentation ................................................................................................................................. 3 Ordering Information.......................................................................................................................................... 3 Evaluation Board Overview ............................................................................................................................... 4 Configuration and I/O Interfaces ....................................................................................................................... 5 EXT_CLK, Jumper JP1 .................................................................................................................................................5 RUN, Jumper JP2 .........................................................................................................................................................5 TRACK_CONTROL.......................................................................................................................................................5 PGOOD .........................................................................................................................................................................5 EXTVCC ........................................................................................................................................................................5 EXT PULSE...................................................................................................................................................................5 Set-Up Options.................................................................................................................................................... 6 Jumper JP1 CLK ...........................................................................................................................................................6 Jumper JP2 RUN ..........................................................................................................................................................6 Jumpers JP4 - JP8 VOUT SELECT ..............................................................................................................................6 Test Interfaces..................................................................................................................................................... 7 Load Transient Circuit ...................................................................................................................................................7 Performance........................................................................................................................................................ 8 Efficiency .......................................................................................................................................................................8 Load Transient Response .............................................................................................................................................8 Output Ripple ................................................................................................................................................................9 Thermal .........................................................................................................................................................................9 Quad MxL7225 EVK Schematic ....................................................................................................................... 10 Quad MxL7225 EVK PCB Layers..................................................................................................................... 14 Quad MxL7225 EVK Bill of Materials .............................................................................................................. 19 12/7/20 021UMR01 iii Quad MxL7225 200A Multiphase EVK User Manual List of Figures List of Figures Figure 1: Monitoring VIN and VOUT .........................................................................................................................................2 Figure 2: Top View of MxL7225 200A Multiphase EVK..........................................................................................................3 Figure 3: Quad MxL7225 200A Multiphase EVK Block Diagram ...........................................................................................4 Figure 4: Load Transient Circuit .............................................................................................................................................7 Figure 5: Measured Efficiency (VIN = 12V, fSW = 500kHz) .....................................................................................................8 Figure 6: Load Transient Response, 100A to 150A (VIN = 12V, VOUT = 1V, fSW = 500kHz) .................................................8 Figure 7: Measured Output Voltage Ripple (VIN = 12V, VOUT = 1V, Load = 200A, fSW = 500kHz)........................................9 Figure 8: Thermal Capture (VIN = 12V, VOUT = 1V, Load = 200A, fSW = 500kHz, 400LFM)..................................................9 Figure 9: EVK Schematic .....................................................................................................................................................10 Figure 10: EVK Schematic, Continued .................................................................................................................................11 Figure 11: EVK Schematic, Continued .................................................................................................................................12 Figure 12: EVK Schematic, Continued .................................................................................................................................13 Figure 13: EVK PCB Silkscreen Top ....................................................................................................................................14 Figure 14: EVK PCB Layer 1................................................................................................................................................14 Figure 15: EVK PCB Layer 2................................................................................................................................................15 Figure 16: EVK PCB Layer 3................................................................................................................................................15 Figure 17: EVK PCB Layer 4................................................................................................................................................16 Figure 18: EVK PCB Layer 5................................................................................................................................................16 Figure 19: EVK PCB Layer 6................................................................................................................................................17 Figure 20: EVK PCB Layer 7................................................................................................................................................17 Figure 21: EVK PCB Layer 8................................................................................................................................................18 12/7/20 021UMR01 iv Quad MxL7225 200A Multiphase EVK User Manual List of Tables List of Tables Table 1: Evaluation Board Ordering Part Number ................................................................................................ 3 Table 2: Factory Settings...................................................................................................................................... 6 Table 3: JP1 Options ............................................................................................................................................ 6 Table 4: JP2 Options ............................................................................................................................................ 6 Table 5: JP4 - JP8 Options................................................................................................................................... 6 Table 6: EVK Bill of Materials ............................................................................................................................. 19 12/7/20 021UMR01 v Quad MxL7225 200A Multiphase EVK User Manual Introduction Introduction The Quad MxL7225 200A Multiphase Evaluation Board provides a platform to evaluate the features and performance of four MxL7225 Power Modules connected in parallel to supply up to a 200A load. Each MxL7225 is a dual 25A Power Module which are optimized for powering Telecom, Networking and Industrial equipment. This manual covers both the BGA and LGA evaluation boards versions of this 200A multiphase application. Quick EVK Set Up and Start Up Factory Settings In addition to utilizing the 4.5V to 15V input voltage range of the MxL7225’s and the 200A maximum load current rating capabilities of using the four MxL7225 Power Modules together, the evaluation board has been set up with the factory default configurations shown below for quick set up and operation. Do not exceed the EVK maximum load current rating. The factory default configuration (Table 2) for the Quad MxL7225 Evaluation Board is: ■ ■ VIN = 4.5V to 15V ■ ■ ■ ■ VOUT = 1.0V ±1.5%. For other VOUT see Jumpers JP4 JP8 VOUT SELECT. ■ IOUT = 0A to 200A ■ ■ 500kHz switching frequency Run is enabled for both channels of all 4 of the MxL7225’s (all 8 channels). See RUN, Jumper JP2. Continuous current mode using internal clock. To use an external clock, see EXT_CLK, Jumper JP1 One pin output voltage ramp up and down tracking programmability A 6.5ms soft-start is selected for all channels Sensing diode biasing at 100µA for internal temperature sense Quick Start Up To quickly see the regulator in operation: 1. Use the factory settings and default configuration. If other settings or components are desired, apply them before the next steps and see Set-Up Options for more. 2. With a power supply turned off and within a VIN specification of 4.5V to 15V (12V typical), connect it to VIN and GND with short, thick leads. Use test pins VIN+ and VIN- to monitor VIN and GND respectively. See locations in Figure 1. 3. For the output, connect a meter and electronic load initially set to 0A, that will be no more than the above maximum IOUT (200A ), to VOUT and GND with short / thick leads capable of this current. See setup and locations in Figure 1. 12/7/20 4. Turn on the power supply and check VOUT. Check to make sure that JP2 is on the ON position. The EVK will power up and (factory default) regulate the output at 1V ±1.5% (0.985V to 1.015V). 5. Set or vary the load (do not exceed the maximum IOUT) and check VOUT and other desired performance levels such as regulation and efficiency. See Configuration and I/O Interfaces and Load Transient Circuit for more on testing and monitoring. 021UMR01 1 Quad MxL7225 200A Multiphase EVK User Manual Quick EVK Set Up and Start Up A Load + A + V - V + VOUT VIN Figure 1: Monitoring VIN and VOUT 12/7/20 021UMR01 2 Quad MxL7225 200A Multiphase EVK User Manual Reference Documentation Figure 2: Top View of MxL7225 200A Multiphase EVK Reference Documentation Please refer to the MxL7225 Data Sheet for additional information about the MxL7225. The datasheet includes a full list of IC features, pinout, pin descriptions, typical performance characteristics and external component calculations. This manual is meant to be used in conjunction with the datasheet. This manual provides Quad MxL7225 EVK Schematic, Quad MxL7225 EVK PCB Layers and Quad MxL7225 EVK Bill of Materials that can be utilized to assist in your board design. The schematics are also available on the MxL7225 product page. Ordering Information Table 1: Evaluation Board Ordering Part Number(1) Power Module Evaluation Board Description MxL7225-ABA-T MxL7225-EVK-2 Quad MxL7225 BGA Power Module Multiphase EVK 1. Refer to www.maxlinear.com/MxL7225 for most up-to-date Ordering Information. 12/7/20 021UMR01 3 Quad MxL7225 200A Multiphase EVK User Manual Evaluation Board Overview Evaluation Board Overview The block diagram shown in Figure 3 illustrates the 7 MxL7225 channels connected in parallel with the 8th channel as the master and the connection points for VIN, VOUT, and VOUT2. Also represented are the CLKOUT to MODE_PLLIN connections between the 4 MxL7225 ICs. MxL7225 VOUT2 Load VIN MxL7225 A + V + - - VIN A MxL7225 VOUT V - VOUT + MxL7225 0 - 200A VOUT and VOUT2 connected via R22, R23, R24 and R26 VFB of all 8 channels connected RUN of all 8 channels connected and connected to JP2 TRACK of all 8 channels connected and connected to TRACK_CONTROL point on board PGOOD of all 8 channels (with pullups) connected and connected to PGOOD point on board Figure 3: Quad MxL7225 200A Multiphase EVK Block Diagram 12/7/20 021UMR01 4 Quad MxL7225 200A Multiphase EVK User Manual Configuration and I/O Interfaces Configuration and I/O Interfaces EXT_CLK, Jumper JP1 Jumper J1 provides an option to connect and synchronize to an external clock or use an internal clock (default). See EXT_CLK, Jumper JP1. RUN, Jumper JP2 Jumper JP2 enables (ON) or disables (OFF) all 8 channels. See RUN, Jumper JP2. TRACK_CONTROL The board’s output voltage tracks the voltage on the TRACK_CONTROL test point when applied. PGOOD A PGOOD test point is provided for all 8 channels. PGOOD signals are tied to INTVCC through 10kΩ resistors. EXTVCC A connection point is provided to inject EXTVCC, if desired. EXT PULSE Used to test load transients. See Load Transient Circuit. 12/7/20 021UMR01 5 Quad MxL7225 200A Multiphase EVK User Manual Set-Up Options Set-Up Options Jumpers are factory installed per Table 2 to configure the EVK for operation. Jumper and testing options are described in the next sections. Refer to the product datasheet for additional information. Table 2: Factory Settings Jumper Label Factory Setting Description JP1 CLK Jumper 2-3 Internal clock JP2 RUN Jumper 1-2 On JP4 0.9V No Jumper JP5 1.0V Jumper 1-2 JP6 1.2V No Jumper JP7 1.5V No Jumper JP8 1.8V No Jumper VOUT SELECT VOUT = 1.0V selected Jumper JP1 CLK Table 3: JP1 Options Jumper Options Description Jumper 1-2 External clock may be applied to synchronize to. Jumper 2-3 (default) Internal clock. Jumper JP2 RUN Table 4: JP2 Options Jumper Options Description Jumper 1-2 (default) On, all channels are enabled. Jumper 2-3 Off, all channels are disabled. Jumpers JP4 - JP8 VOUT SELECT Table 5: JP4 - JP8 Options Jumper JP4 JP5 JP6 JP7 JP8 12/7/20 Jumper Options Description Jumper 1-2 VOUT = 0.9V selected only. No jumper (default) VOUT = 0.9V not selected. Jumper 1-2 (default) VOUT = 1.0V selected only. No jumper VOUT = 1.0V not selected. Jumper 1-2 VOUT = 1.2V selected only. No jumper (default) VOUT = 1.2V not selected. Jumper 1-2 VOUT = 1.5V selected only. No jumper (default) VOUT = 1.5V not selected. Jumper 1-2 VOUT = 1.8V selected only. No jumper (default) VOUT = 1.8V not selected. 021UMR01 6 Quad MxL7225 200A Multiphase EVK User Manual Test Interfaces Test Interfaces Load Transient Circuit A load transient circuit is provided to allow optional testing of load transients. The EXT PULSE (E33) clock input is used to drive the transient signal. The load step generated by the FETs (Q1 and Q2) is very fast; the step slew rate is >40A/µs for a 50A transient load test case. To measure load transient response, use the circuit shown in Figure 4. Populate R101 and R102 and apply a small duty cycle pulse signal to the EXT PULSE (E33) input (~ 1%). Adjust the amplitude of the EXT PULSE (E33) pulse to set the load current. Start at a pulse amplitude of 2V and increase while monitoring the IOUT STEP (J12) voltage. The load current at IOUT STEP (J12) is 5mV/A. For an example, a 100A load will occur when a 500mV pulse is observed at J12. '