Evaluates: MAX17233, MAX17232 MAX17233 Evaluation Kit General Description Quick Start The MAX17233 evaluation kit (EV kit) is a fully assembled Recommended Equipment and tested application circuit board for the MAX17233 MAX17233 EV kit high-voltage, dual synchronous step-down controller. The 6V to 36V, 15A power supply EV kit is set up to provide 5V and 3.3V from an input voltage Two voltmeters ranging from 6V to 36V. Each buck rail can deliver up to Two electronic loads capable of sinking 5A each 5A load current. The EV kits switching frequency is set at 2.2MHz for both buck converters. Various jumpers are Procedure provided to help evaluate features of the MAX17233 IC. The EV kit is fully assembled and tested. Follow the steps below to activate the board. Caution: Do not turn on the Features power supply until all connections are completed. Dual, Synchronous Step-Down Controllers Operate at 1) Verify that all jumpers are in their default configurations 180 Out-of-Phase to Reduce Switching Noise according to Table 1. 6V to 36V Wide Input Supply Range 2) Connect the positive and negative terminals of the Buck Output Voltage: 5V and 3.3V Fixed/Adjustable power supply to the VBAT and PGND banana jacks, Between 1V and 10V respectively. Current-Mode Controllers with Forced-PWM and Skip Modes 3) Connect the positive terminal of the first electronic Resistor-Configurable Frequency Between 1MHz load to the V banana jack. Connect the ground OUT1 and 2.2MHz terminal of the electronic load to the corresponding PGND banana jack. 89% Peak Efficiency 6V Input in Skip-Mode FSYNC Input and Power-Good Output 4) Connect the positive terminal of the second electronic load to the V banana jack. Connect the ground Proven 4-Layer 2oz Copper PCB Layout OUT2 terminal of the electronic load to the corresponding Demonstrates 2800mil x 1300mil Solution Size PGND banana jack. Fully Assembled and Tested 5) Set the power-supply voltage to 14V. EV Kit Contents 6) Turn on the power supply. MAX17233 EV Kit Board 7) Enable the electronic loads. 8) Verify that V is approximately 5V. OUT1 9) Verify that V is approximately 3.3V. OUT2 Ordering Information appears at end of data sheet. 19-8451 Rev 0 2/16Evaluates: MAX17233, MAX17232 MAX17233 Evaluation Kit Table 1. Default Jumper Settings JUMPER DEFAULT SHUNT POSITION FUNCTION JU1, JU2 1-2 Buck outputs enabled. JU6 1-2 Forced-PWM mode. JU7 1-2 Switches to EXTVCC. Internal regulator disabled. JU8, JU9 Installed PGOOD pulls up to BIAS when OUT is in regulation. Detailed Description of Hardware Table 2. Enable Control (JU1, JU2) The MAX17233 EV kit, which evaluates the MAX17233 SHUNT EN PIN VOUT high-voltage, dual synchronous step-down controller, can POSITION supply up to two rails. The EV kit includes two current-mode 1-2* Connected to VBAT Enabled buck outputs that are fixed to 5V and 3.3V, or configurable 2-3 Connected to PGND Disabled from 1V to 10V with external resistor-dividers. The current capability is 5A per rail. Both outputs are current limited and *Default configuration. can be controlled independently through their respective enable inputs EN . Table 3. Mode of Operation (JU6) Switching Frequency/External Synchronization SHUNT FSYNC MODE POSITION PIN The EV kit switching frequency can be adjusted from 1MHz to 2.2MHz by changing the FOSC resistor R136. 1-2* Connected to BIAS Forced-PWM mode The EV kit can also be synchronized to an external clock 2-3 Connected to AGND Skip mode by connecting the external clock signal to the FSYNC *Default configuration. test point and AGND. Refer to the Switching Frequency/ External Synchronization section of the MAX17233 IC data sheet for more details. Table 4. EXTVCC (JU7) Enable Control SHUNT EXTVCC BIAS POSITION PIN The EV kit features jumper JU1 to independently control the enable input of V and jumper JU2 to control the OUT1 Switches to EXTVCC. Connected to enable input of V . Connect the EN pin to V OUT2 BAT 1-2 Internal regulator VOUT1 (pins 1-2) to enable V . Connect the EN pin to OUT disabled. PGND (pins 2-3) to disable V . See Table 2. OUT Connected to Internal regulator 1-3* PGND enabled. Mode of Operation The EV kit features jumper JU6 to configure the mode Switches to EXTVCC. Connected to switch-control input (Table 3). Drive FSYNC high (pins 1-2 1-4 Internal regulator VOUT2 of JU6) to enable forced-PWM mode. Drive FSYNC low disabled. (pins 2-3 of JU6) to enable skip mode under light loads. *Default configuration. EXTVCC Switchover Comparator Buck Output Monitoring (PGOOD ) The EV kit provides two power-good output test points The internal linear regulator can be bypassed by connecting an external supply (3.1V to 5.2V) or the output of one of (PGOOD1 and PGOOD2) to monitor the status of the two buck outputs (OUT1 and OUT2). Each PGOOD goes the buck converters to EXTVCC. BIAS internally switches to EXTVCC and the internal linear regulator turns off. high (high impedance) when the corresponding regulator output voltage is in regulation. Each PGOOD goes low If V drops below V = 3.1V(min), the EXTVCC TH,EXTVCC internal regulator enables and switches back to BIAS. when the corresponding regula tor output voltage drops below 15% (typ) or rises above 10% (typ) of its nominal See Table 4. regulated voltage. PGOOD asserts low during soft-start Maxim Integrated 2 www.maximintegrated.com