Click here for production status of specific part numbers. Evaluates: MAXM15066 5V MAXM15066 5V Output Output-Voltage Application Evaluation Kit General Description Quick Start The MAXM15066 5V output evaluation kit (EV kit) pro- Recommended Equipment vides a proven design to evaluate the MAXM15066 One 4.5V to 60V DC, 300mA power supply high-voltage, high-efficiency, synchronous step-down 1.5W resistive load with 300mA sink capacity DC-DC module. The EV kit is programmed to deliver 5V output for loads up to 300mA. The EV kit features an Four digital multimeters (DMM) adjustable input undervoltage lockout, selectable mode, MAXM15066EVKIT and open-drain RESET signal. The MAXM15066 data sheet provides a complete description of the module Equipment Setup and Test Procedure that should be read in conjunction with this EV kit data The EV kit is fully assembled and tested. Follow the steps sheet prior to modifying the demo circuit. For full module below to verify the board operation. features, benefits and parameters, refer to the MAXM15066 Caution: Do not turn on power supply until all data sheet. connections are completed. 1) Set the power supply at a voltage between 4.5V and Features 60V. Then, disable the power supply. Highly Integrated Solution 2) Connect the positive terminal of the power supply to Wide 8.5V to 60V Input Range the VIN PCB pad and the negative terminal to the Fixed 5V Output, Delivers Up To 300mA nearest GND PCB pad. Connect the positive termi- Output Current nal of the 300mA load to the VOUT PCB pad and the High 85.01% Efficiency negative terminal to the nearest GND PCB pad. (V = 24V, V = 5V at 150mA) IN OUT 3) Connect the DVM (DMM in voltage-measurement 550kHz Switching Frequency mode) across the VOUT PCB pad and the nearest GND PCB pad. ENABLE/UVLO Input, Resistor-Programmable UVLO Threshold 4) Verify that shunt is not installed on jumper J1 (see Table 1 for details). PFM Feature for Better Light-Load Efficiency 5) Turn on the DC power supply. Fixed Internal 3.75ms Soft-Start Time 6) Enable the load. RESET Output, with Pullup Resistor to V CC 7) Verify that the DVM displays 5V. Overcurrent and Overtemperature Protection (OCP and OTP) Low-Profile, Surface-Mount Components Proven PCB Layout Ordering Information appears at end of data sheet. Fully Assembled and Tested Complies with CISPR22(EN55022) Class B Conducted and Radiated Emissions 319-100385 Rev 0 6/19Evaluates: MAXM15066 5V MAXM15066 5V Output Evaluation Kit Output-Voltage Application currents drawn by the switching power converter, and Detailed Description limits the noise injected back into the input power source. The MAXM15066 EV kit is designed to demonstrate Use of EMI filter components as shown in Figure 1 salient features of MAXM15066 power module. The EV kit includes an EN/UVLO PCB pad, and jumper J1, to enable in conjunction with the schematic results in lower conducted emissions, below CISPR22 Class B limits. The the output at a desired input voltage. Jumper J2 allows selection of either PWM or PFM mode of operation based MAXM15066 5V EV Kit PCB Layout Diagrams is also designed to limit radiated emissions from switching nodes on light-load performance requirements. An additional RESET pad is available for monitoring if the converter of the power converter, resulting in radiated emissions below CISPR22 Class B limits. output voltage is in regulation. Output Capacitor Selection Electromagnetic Interference (EMI) Compliance to conducted emissions (CE) standards X7R ceramic output capacitors are preferred due to their requires an EMI filter at the input of a switching power stability over temperature in industrial applications. The converter. The EMI filter attenuates high-frequency required output capacitor (C5) for 5V output is selected currents drawn by the switching power converter and from Table 1 of the MAXM15066 data sheet as 10F/16V. limits the noise injected back into the input power source. Fixed Output Voltage Use of EMI filter components as shown in Figure 1 in The MAXM15066 is a fixed 5V output module. Connect FB conjunction with the schematic results in lower con- of the MAXM15066 directly to V for feedback control. OUT ducted emissions below CISPR22 Class B limits. The MAXM15066 EV kit PCB layout is also designed to limit Enable/Undervoltage-Lockout (EN/UVLO) radiated emissions from switching nodes of the power Programming converter resulting in radiated emissions below CISPR22 The MAXM15066 offers an adjustable input undervoltage- Class B limits. lockout feature. In this EV kit, for normal operation, leave jumper J1 open. When J1 is left open, the MAXM15066 is enabled when the input voltage rises above 8.5V. To Table 1. UVLO Enable/Disable disable MAXM15066, install a jumper across pins 2-3 on Configuration (J1) J1. See Table 1 for J1 settings. A potential divider formed by R1 and R2 sets the input voltage (V ) at which the MAXM15066 INU POSITION EN/UVLO PIN OUTPUT module is enabled. The value of resistor R1 is chosen to be 2.2M, and R2 is calculated using the following Connected to the Programmed to Not equation: center node of resistor- startup at desired Installed* divider R1 and R2. input-voltage level. R 1.215 1 R = 2 ( V 1.215 ) Enabled if V is IN INU 1-2 Connected to V IN greater than V IN(MIN). where R1 and R2 are in k, 2-3 Connected to GND Disabled For MAXM15066 to turn on at 8.5V input, the Resistor R2 *Default position is calculated to be 374k. Input Capacitor Selection The input capacitor serves to reduce the current peaks VIN EMI VIN drawn from the input power supply and reduces switching frequency ripple at the input. The input capacitance must L 1 VIN EMI be greater than or equal to the value given in Table 1 of 82H MAXM15066 data sheet. Input capacitor C3 is chosen to C C 8 9 C7 be 1F/100V. 1F 0.68F 0.1F Electro-Magnetic Interference (EMI) Compliance to conducted emissions (CE) standards requires an EMI filter at the input of a switching power Figure 1. EMI Filter Components converter. The EMI filter attenuates high-frequency Maxim Integrated 2 www.maximintegrated.com