Evaluates: MAX20030/MAX20031 MAX20030 Evaluation Kit General Description Quick Start The MAX20030 evaluation kit (EV kit) is a fully assembled Required Equipment and tested application circuit for the MAX20030 high- MAX20030 EV kit voltage, dual-synchronous step-down controller IC with 3.5V to 36V, 15A power supply capable of providing preboost and an internal LDO. The EV kit is set up to pro- 15A at 3V input vide 5V and 3.3V from an input voltage ranging from 3.5V to 36V. The preboost circuit maintains the 10V supply rail Two voltmeters for input voltages below 10V. Each buck rail can deliver Two electronic loads capable of sinking 5A each up to 5A load current. Various jumpers are provided to help evaluate features of the IC. The EV kit can also be Procedure used to evaluate the pin-compatible MAX20031 with IC The EV kit is fully assembled and tested. Follow the steps replacement of U1. below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. Benefits and Features 1) Verify that all jumpers are in their default positions Dual-Synchronous Step-Down Controllers Operate at according to Table 1. 180 Out-of-Phase to Reduce Switching Noise 2) Connect the positive and negative terminals of the Preboost Controller Maintains Operation with Low power supply to the VBATF and PGND test pads, Supply Voltage respectively. 3) Connect the positive terminal of the first electronic 3.5V to 36V Wide Input Supply Range load to the VOUT1 test pad. Connect the ground Buck Output Voltage: 5V and 3.3V Fixed or terminal of the electronic load to the corresponding Adjustable Between 1V and 10V PGND test pad. 5V, 200mA LDO Output 4) Connect the positive terminal of the second electronic load to the VOUT2 test pad. Connect the ground termi- Current-Mode Controllers with Forced-PWM and Skip nal of the electronic load to the corresponding PGND Modes test pad. Resistor-Programmable Frequency Between 1MHz 5) Set the power-supply voltage to 14V. and 2.2MHz 6) Turn on the power supply. Frequency Synchronization Input 7) Enable the electronic loads. 8) Verify that VOUT1 is approximately 5V. Independent Enable Inputs 9) Verify that VOUT2 is approximately 3.3V. Voltage-Monitoring PGOOD Outputs 10) Verify that the buck 1 and buck 2 switching frequency Proven PCB Layout is approximately 2.0MHz. Fully Assembled and Tested Ordering Information appears at end of data sheet. 319-100021 Rev 1 3/20Evaluates: MAX20030/MAX20031 MAX20030 Evaluation Kit Table 1. Default Jumper Settings Detailed Description The MAX20030 EV kit, which evaluates the MAX20030 DEFAULT SHUNT JUMPER FUNCTIONS high-voltage, dual-synchronous step-down controller with POSITION a boost controller and a 200mA LDO, can supply up to JU1 1-2 Forced-PWM mode four rails in a system. The EV kit includes two current- Boost disabled (active- mode buck controllers that are fixed to 5V and 3.3V, or JU2, JU6 Open, Installed high version IC used) programmable from 1V to 10V with external resistor- dividers. The current capability is ~5A per rail. Both outputs OUT1 connected to JU3 1-4 are current limited and can be controlled independently EXTVCC through their respective enable inputs EN . The EV kit JU4, JU5, Buck controllers and 1-2 includes an external boost controller that enables full out- JU7 LDO enabled put functionality during undervoltage events. The boost PGOOD pulls up to controller is designed to support full load on buck con- JU8, JU9 Installed V when OUT is in BIAS trollers down to 2V input. The EV kit also includes a 5V, regulation 200mA linear regulator that is low I and can be used to Q power always-on systems. Boost on-indicator JU10 Installed enabled Switching Frequency/External Spread spectrum Synchronization JU11 2-3 disabled The EV kit switching frequency can be adjusted from 220kHz to 2.2MHz by changing the FOSC resistor (R75). The EV kit can also be synchronized to an external clock Table 2. EXTVCC (JU3) by connecting the external clock signal to the FSYNC SHUNT test point. Refer to the Switching Frequency/External EXTVCC PIN BIAS POSITION Synchronization section in the MAX20030 IC data sheet for more information. Switches to EXTVCC. Connected to 1-2 Internal regulator Buck Output Monitoring (PGOOD ) VOUT2 disabled. The EV kit provides two power-good output test points Internal regulator en- (PGOOD1 and PGOOD2) to monitor the status of the Connected to 1-3 abled to generate BIAS two buck outputs (OUT1 and OUT2). Each PGOOD PGND supply. goes high impedance when the corresponding regulator output voltage is in regulation. Each PGOOD goes low Switches to EXTVCC. Connected to when the corresponding regulator output voltage drops 1-4* Internal regulator VOUT1 below 15% (typ) or rises above 10% (typ) of its nominal disabled. regulated voltage. *Default position. To obtain a logic signal, pull up PGOOD to V by BIAS installing shunts on JU1 and JU2. See Table 1 for default jumper settings. EXTVCC Switchover Comparator The internal linear regulator can be bypassed by connecting an external supply (3V to 5.2V) or the output of one of the buck converters to EXTVCC. BIAS internally switches to EXTVCC and the internal linear regulator turns off. If V drops below V = 3V (min), the EXTVCC TH,EXTVCC internal regulator enables and switches back to BIAS. See Table 2 for shunt positions. Maxim Integrated 2 www.maximintegrated.com