Click here for production status of specific part numbers. Evaluates: MAXM15064 5V MAXM15064 5V Output Output-Voltage Application Evaluation Kit General Description Quick Start The MAXM15064 5V output evaluation kit (EV kit) pro- Recommended Equipment vides a proven design to evaluate the MAXM15064 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, MAXM15064EVKIT and open-drain RESET signal. The MAXM15064 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 MAXM15064 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 12V to 60V Input Range the VIN PCB pad and the negative terminal to the Programmed 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 78.68% Efficiency negative terminal to the nearest GND PCB pad. (V = 48V, V = 5V at 220mA) IN OUT 3) Connect the DVM (DMM in voltage-measurement 500kHz 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 4.1ms 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) Ordering Information appears at end of data sheet. Low-Profile, Surface-Mount Components Proven PCB Layout Fully Assembled and Tested Complies with CISPR22(EN55022) Class B Conducted and Radiated Emissions 319-100150 Rev 1 1/19Evaluates: MAXM15064 5V MAXM15064 5V Output Evaluation Kit Output-Voltage Application Electro-Magnetic Interference (EMI) Detailed Description Compliance to conducted emissions (CE) standards The MAXM15064 EV kit is designed to demonstrate requires an EMI filter at the input of a switching power salient features of MAXM15064 power module. The EV kit converter. The EMI filter attenuates high-frequency includes an EN/UVLO PCB pad, and jumper J1, to enable currents drawn by the switching power converter, and the output at a desired input voltage. Jumper J2 allows limits the noise injected back into the input power source. selection of either PWM or PFM mode of operation based on light-load performance requirements. An additional Use of EMI filter components as shown in Figure 1 RESET pad is available for monitoring if the converter in conjunction with the schematic results in lower output voltage is in regulation. conducted emissions, below CISPR22 Class B limits. The MAXM15064 5V EV Kit PCB Layout Diagrams is also Output Capacitor Selection designed to limit radiated emissions from switching nodes X7R ceramic output capacitors are preferred due to their of the power converter, resulting in radiated emissions stability over temperature in industrial applications. The below CISPR22 Class B limits. required output capacitor (C5) for 5V output is selected from Table 1 of the MAXM15064 data sheet as 10F/6.3V. Hot-Plug-In and Long Input Cables The MAXM15064 EV kit PCB provides an optional Adjusting Output Voltage electrolytic capacitor (C2, 4.7F/100V) to dampen input The MAXM15064 supports an adjustable output-voltage voltage peaks and oscillations that can arise during hot- range, from 0.9V to 5V, using a feedback resistive divider plug-in and/or due to long input cables. This capacitor from V to FB. Output voltage can be programmed OUT limits the peak voltage at the input of the MAXM15064 using the values given in Table 1 of the MAXM15064 data power module, when the EV kit is powered directly from a sheet. For 5V output, R3 is chosen as 348k, and R4 is precharged capacitive source or an industrial backplane chosen as 75k. PCB. Long input cables, between input power source and the EV kit circuit can cause input-voltage oscillations due Enable/Undervoltage-Lockout (EN/UVLO) to the inductance of the cables. The equivalent series Programming The MAXM15064 offers an adjustable input undervoltage- Table 1. UVLO Enable/Disable lockout feature. In this EV kit, for normal operation, leave Configuration (J1) jumper J1 open. When J1 is left open, the MAXM15064 is enabled when the input voltage rises above 12V. To MAXM15064 POSITION EN/UVLO PIN disable MAXM15064, install a jumper across pins 2-3 on OUTPUT J1. See Table 1 for J1 settings. A potential divider formed Connected to the Programmed to by R1 and R2 sets the input voltage (V ) at which the INU Not center node of resistor- startup at desired module is enabled. The value of resistor R1 is chosen Installed* divider R1 and R2. input-voltage level. to be 2.2M, and R2 is calculated using the following equation: Enabled if V is IN 1-2 Connected to V IN greater than V IN(MIN). R 1.215 1 R = 2 2-3 Connected to GND Disabled ( V 1.215 ) INU *Default position where R1 and R2 are in k, For MAXM15064 to turn on at 12V input, the Resistor R2 is calculated to be 249k. VIN EMI VIN L1 Input Capacitor Selection VIN EMI 82H The input capacitor serves to reduce the current peaks drawn from the input power supply and reduces switching C C C 7 8 9 frequency ripple at the input. The input capacitance must 0.1F 0.68F 1F be greater than or equal to the value given in Table 1 of MAXM15064 data sheet. Input capacitor C3 is chosen to be 1F/100V. Figure 1. EMI Filter Components Maxim Integrated 2 www.maximintegrated.com