Evaluates: MAX16932, MAX16933 MAX16932 Evaluation Kit General Description Quick Start The MAX16932 evaluation kit (EV kit) is a fully assembled Recommended Equipment and tested application circuit for the MAX16932 high- MAX16932 EV kit voltage, dual synchronous step-down controller. The EV 3.5V to 36V, 15A power supply kit is set up to provide 5V and 3.3V from an input voltage ranging from 3.5V to 36V. Each buck rail can deliver up Two voltmeters to 5A load current. The EV kits switching frequency is set Two electronic loads capable of sinking 5A each at 2.2MHz for both buck converters. Various jumpers are provided to help evaluate features of the MAX16932 IC. Procedure The EV kit is fully assembled and tested. Follow the steps Benefits and Features below to activate the board. Caution: Do not turn on the Dual, Synchronous Step-Down Controllers Operate power supply until all connections are completed. at 180 Out-of-Phase to Reduce Switching Noise 1) Verify that all jumpers are in their default configura- 3.5V to 36V Wide Input Supply Range tions according to Table 1. Buck Output Voltage: 5V and 3.3V Fixed or 2) Connect the positive and negative terminals of the Adjustable Between 1V and 10V power supply to the VBATF and PGND test pads, respectively. Current-Mode Controllers with Forced-PWM and Skip Modes 3) Connect the positive terminal of the first electronic load to the VOUT1 test pad. Connect the ground Resistor-Programmable Frequency Between 1MHz terminal of the electronic load to the corresponding and 2.2MHz PGND test pad. Frequency Synchronization Input 4) Connect the positive terminal of the second electronic Independent Enable Inputs load to the VOUT2 test pad. Connect the ground Voltage Monitoring PGOOD Outputs terminal of the electronic load to the corresponding PGND test pad. Fully Assembled and Tested 5) Set the power-supply voltage to 14V. EV Kit Contents 6) Turn on the power supply. MAX16932 EV Kit Board 7) Enable the electronic loads. 8) Verify that VOUT1 is approximately 5V. 9) Verify that VOUT2 is approximately 3.3V. Ordering Information appears at end of data sheet. 19-6806 Rev 0 9/13Evaluates: MAX16932, MAX16933 MAX16932 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 VBIAS when OUT is in regulation. Detailed Description of Hardware Table 2. Enable Control (JU1, JU2) The MAX16932 EV kit, which evaluates the MAX16932 SHUNT EN PIN VOUT high-voltage, dual synchronous step-down controller, can POSITION supply up to two rails. The EV kit includes two current- 1-2* Connected to VBAT Enabled mode buck outputs that are fixed to 5V and 3.3V, or pro- 2-3 Connected to PGND Disabled grammable from 1V to 10V with external resistor-dividers. The current capability is 5A per rail. Both outputs are cur- *Default configuration. rent limited and can be controlled independently through their respective enable inputs EN . Table 3. Mode of Operation (JU6) Switching Frequency/ SHUNT FSYNC MODE External Synchronization POSITION PIN The EV kit switching frequency can be adjusted from 1-2* Connected to BIAS Forced-PWM mode 1MHz to 2.2MHz by changing the FOSC resistor R136. 2-3 Connected to AGND Skip mode The EV kit can also be synchronized to an external clock *Default configuration. by connecting the external clock signal to the FSYNC test point. Refer to the Switching Frequency/External Table 4. EXTVCC (JU7) Synchronization section in the MAX16932 IC data sheet for more details. SHUNT EXTVCC BIAS Enable Control POSITION PIN The EV kit features jumper JU1 to independently control Switches to EXTVCC. Connected to the enable input of VOUT1 and jumper JU2 to control the 1-2 Internal regulator VOUT1 enable input of VOUT2. Connect the EN pin to VBAT disabled. (pins 1-2) to enable VOUT . Connect the EN pin to Connected to Internal regulator ground (pins 2-3) to disable VOUT . See Table 2. 1-3* PGND enabled. Mode of Operation Switches to EXTVCC. Connected to The EV kit features jumper JU6 to configure the mode 1-4 Internal regulator VOUT2 switch-control input (Table 3). Drive FSYNC high (pins 1-2 disabled. of JU6) to enable forced-PWM mode. Drive FSYNC low *Default configuration. (pins 2-3 of JU6) to enable skip mode under light loads. EXTVCC Switchover Comparator The internal linear regulator can be bypassed by con- necting an external supply (3.1V to 5.2V) or the output of one of the buck converters to EXTVCC. BIAS inter- nally switches to EXTVCC and the internal linear regu- lator turns off. If V drops below V = EXTVCC TH,EXTVCC 3.1V(min), the internal regulator enables and switches back to BIAS. See Table 4. Maxim Integrated 2 www.maximintegrated.com