Click here for production status of specific part numbers. Evaluates: MAX17672 MAX17672CEVKIT Evaluation Kit 5V Buck Output Voltage and 1.8V Linear Regulator Output Voltage General Description Features The MAX17672CEVKIT evaluation kit (EV kit) is a fully 6.5V to 60V Input-Voltage Range for the Step-Down assembled and tested circuit board that demonstrates the Converter performance of the MAX17672C dual-output regulator 5V Step-Down Converter Output Voltage, Up To integrating a high-efficiency, high voltage, adjustable out - 150mA Continuous Load Current put voltage, synchronous step-down DC-DC converter, 1.8V Linear Regulator Output Voltage, Up To 50mA and a high-PSRR, low-noise, fixed-output linear regulator. Continuous Load Current The EV kit is designed for a balanced size and efficiency Peak Efficiency of 90.2% for the Step-Down Converter solution and generates a 5V step-down converter output voltage and a fixed 1.8V linear regulator output voltage at 120A No-Load Supply Current load currents up to 150mA and 50mA, respectively. When 600kHz Switching Frequency the linear regulator output is loaded, the step-down con- Internal Soft-Start verter output current is reduced by I , where I is LDO LDO the load current on the linear regulator output in mA. The EN/UVLO Input, Resistor-Programmable UVLO EV kit draws only 120A supply current under no-load Threshold conditions. The step-down converter is programmed to a MODE/SYNC Pin to Select PWM or PFM Mode switching frequency of 600kHz and delivers a peak effi - Open-Drain RESET Output to Monitor Dual Outputs ciency of 90.2% with the supplied components. The dual- output device is simple to use and easily configurable with External Clock Synchronization minimal external components. The EV kit features adjust- Overcurrent and Overtemperature Protection able input undervoltage lockout, open-drain RESET sig- Proven PCB Layout nal, hysteretic peak current-limit protection and external clock synchronization. The EV kit also provides a good Fully Assembled and Tested layout example, which is optimized for conducted and Complies with CISPR22(EN55022) Class B radiated EMI. For more details about the IC benefits and Conducted and Radiated Emissions features, refer to the MAX17672 IC data sheet Ordering Information appears at end of data sheet. 319-100286 Rev 1 7/19Evaluates: MAX17672 MAX17672CEVKIT Evaluation Kit 5V Buck Output Voltage and 1.8V Linear Regulator Output Voltage 14) Connect the DVM across the RESET pad and GND. Quick Start Verify that the DVM displays 0V. Required Equipment 15) Disable the input power supply. MAX17672CEVKIT 6.5V to 60V, 200mA DC-input power supply Detailed Description Two loads capable of sinking 150mA and 50mA The MAX17672CEVKIT evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the Two digital voltmeters (DVM) performance of the MAX17672C dual-output regulators Procedure integrating a high-efficiency, high voltage, adjustable output voltage, synchronous step-down DC-DC converter, and a The EV kit is fully assembled and tested. Follow the steps high-PSRR, low-noise, fixed output linear regulator. The below to verify board operation. step-down converter operates over a wide input range of Caution: Do not turn on the power supply until all con- 6.5V to 60V and the input of the linear regulator is con- nections are completed. nected to the output of the step-down converter. The EV kit 1) Set the power supply at a voltage between 6.5V and is designed for a balanced size and efficiency solution and 60V. Disable the power supply. generates a 5V step-down converter output voltage and a fixed 1.8V linear regulator output voltage, at load currents up 2) Connect the positive terminal of the power supply to the VIN PCB pad and the negative terminal to the nearest to 150mA and 50mA, respectively. When the linear regulator output is loaded, the step-down converter output current is GND PCB pad. Connect the positive terminal of the 150mA load to the VOUT PCB pad and the negative reduced by I , where I is the load current on the linear LDO LDO regulator output in mA. The EV kit draws only 120A supply terminal to the nearest GND PCB pad. Connect the positive terminal of the 50mA load to the OUTL PCB pad current under no-load conditions. The step-down converter is and the negative terminal to the nearest GND PCB pad. programmed to a switching frequency of 600kHz and deliv- ers a peak efficiency of 90.2% with the supplied components. 3) Connect the DVMs across the VOUT PCB pad and the The dual-output device is simple to use and easily configu - nearest GND PCB pad, and across the OUTL PCB pad rable with minimal external components. The EV kit features and the nearest GND PCB pad. adjustable-input undervoltage lockout, open-drain RESET 4) Verify that the jumper JU1 is open (see Table 1). signal, hysteretic peak current-limit protection and external 5) Select the shunt position on the jumper JU2 according to frequency synchronization. the intended mode of operation (see Table 2). This EV kit includes an EN/UVLO PCB pad and JU1 to 6) Turn on the DC power supply. enable the step-down converter output at a desired input voltage. The MODE/SYNC PCB pad and JU2 are provided 7) Enable the loads. If linear regulator output is not loaded, for selecting the intended mode of operation and to allow step-down converter output can be loaded up to 150mA. an external clock to synchronize the step-down converter. Else, it can be loaded up to (150 - I )mA, where I LDO LDO A RESET PCB pad is available for monitoring the RESET is the load current on the linear regulator output in mA. output. 8) Verify that the DVMs display 5V and 1.8V. 9) Vary the input voltage from 6.5V to 60V, and vary the load currents on step-down converter and linear regula- VIN IN tor outputs, and verify that the output voltages of step- down converter and linear regulator are 5V and 1.8V, R1 respectively. MAX17672C 10) Connect the DVM across the RESET pad and GND. EN/UVLO Verify that the DVM displays 5V. R2 11) Reduce the input voltage to 5V which is below the EN/UVLO falling threshold. GND 12) Connect the DVM across the VOUT pad and nearest GND. Verify that the DVM displays 0V. 13) Connect the DVM across the OUTL pad and nearest Figure 1. Setting the Input-Undervoltage Lockout GND. Verify that the DVM displays 0V. Maxim Integrated 2 www.maximintegrated.com