Click here for production status of specific part numbers. Evaluates: MAX20049 MAX20049 Evaluation Kit General Description Quick Start The MAX20049 evaluation kit (EV kit) is a fully assembled Required Equipment and tested application circuit for the MAX20049 mini MAX20049 EV kit dual step-down converters with dual LDOs. The EV kit 2.7V to 18V, 3A power supply is set up to provide four output voltages from one single input-voltage source. Both step-down converters (OUT1, Four voltmeters OUT2) and LDO3 can accept a high input-voltage source Electronic load capable of sinking 1A (17V max). The IC also features a high-PSRR and low- noise LDO3. Each step-down converter can deliver up to Procedure 500mA load current, whereas LDO3 delivers 100mA and The EV kit is fully assembled and tested. Follow the steps LDO4 400mA. below to verify board operation: 1) Verify that jumper JU1 is in the default configuration, Features as shown in Table 1. MAX20049ATEA/VY+ Installed 2) Set the power-supply voltage to 14V and then turn off. (Other IC Options Available): 3) Connect the positive and negative terminals of the V = 3.8V power supply to the SUP and PGND3 test pads, re- OUT1 V = 1.8V spectively. OUT2 V = 3.3V 4) Connect the positive terminal of the first voltmeter to OUT3 V = 1.2V the OUT1 test pad and the negative terminal to the OUT4 Inductors Installed Balance Size and Efficiency (see GND1 test pad. Bill of Materials) 5) Connect the positive terminal of the second voltmeter to the OUT2 test pad and the negative terminal to the PGOOD PCB Pad Provided for Voltage Monitoring GND2 test pad. Configurable SUP1 and SUP2 Using Resistors R4 6) Connect the positive terminal of the third voltmeter to and R5 the OUT3 test pad and the negative terminal to the Selectable LDOIN3 Input Using Jumper JU1 GND3 test pad. 7) Connect the positive terminal of the fourth voltmeter Proven PCB Layout to the OUT4 test pad and the negative terminal to Fully Assembled and Tested GND4 test pad. 8) Turn on the power supply. 9) Verify that OUT1 is approximately 3.8V. 10) Verify that OUT2 is approximately 1.8V. 11) Verify that OUT3 is approximately 3.3V. Ordering Information appears at end of data sheet. 12) Verify that OUT4 is approximately 1.2V. 13) Set the electronic load to 500mA, turn off, and then connect to OUT1. 14) Turn on the electronic load and verify that OUT1 is still approximately 3.8V. Turn off the electronic load and disconnect. 319-100234 Rev 0 8/18Evaluates: MAX20049 MAX20049 Evaluation Kit 15) Set the electronic load to 500mA, turn off, and then High-Voltage, High-PSRR LDO3 Input connect to OUT2. Power Selector 16) Turn on the electronic load and verify that OUT2 is Jumper JU1 configures the input power source into the still approximately 1.8V. Turn off the electronic load high-voltage, high-PSRR LDO3. See Table 2 to configure and disconnect. the appropriate power source for LDO3. 17) Set the electronic load to 100mA, turn off, and then Flexible Power Configurations connect to OUT3. 18) Turn on the electronic load and verify that OUT3 is Below are some of the possible configurations of the still approximately 3.3V. Turn off the electronic load MAX20049. The MAX20049 EV kit has a separate jumper and disconnect. 19) Set the electronic load to 400mA, turn off, and then Table 1. Default Jumper Settings (JU1) connect to OUT4. 20) Turn on the electronic load and verify that OUT4 is DEFAULT still approximately 1.2V. Turn off the electronic load JUMPER SHUNT FUNCTION and disconnect. POSITION JU1 14 LDO3 powered from OUT1 Detailed Description of Hardware The MAX20049 EV kit, which evaluates the MAX20049 dual step-down converter with dual LDOs, can supply up Table 2. Input Power Source to LDOIN3 to four separate voltage rails. The MAX20049 output volt- Pin (JU1) ages are preprogrammed and set at the factory. Both OUT1 and OUT2 converters are high voltage (18V SHUNT LDOIN3 PIN max) and support load currents up to 500mA. LDO3 also POSITION supports a high-input voltage (18V max) and is a high- 1-2 Connected to OUT2 PSRR, low-noise 100mA LDO. LDO4 is a low-input-volt- 1-3 Connected to car battery age LDO and can support up to 400mA of load current. 1-4* Connected to OUT1 Output Voltage Configurations *Default position. Contact the factory for available voltage options. Maxim Integrated 2 www.maximintegrated.com