Click here for production status of specific part numbers. MAX15062AEVKIT Evaluates: MAX15062A Evaluation Kit General Description Quick Start The MAX15062AEVKIT evaluation kit (EV kit) is a fully Recommended Equipment assembled and tested circuit board that demonstrates the MAX15062AEVKIT EV kit performance of the MAX15062A 60V, 300mA ultra-small, 60V adjustable, 0.5A DC power supply high-efficiency, synchronous step-down converter. The EV kit operates over a wide 4.5V to 60V input voltage Load capable of sinking 300mA range, and provides up to 300mA at the preset 3.3V out- Voltmeter put. The device features undervoltage lockout, overcur- rent protection, and thermal shutdown. The EV kit switch- Equipment Setup and Test Procedure es at a fixed frequency of 500kHz, and delivers a peak The EV kit is fully assembled and tested. Follow the steps efficiency of 90% with the supplied components. below to verify board operation. The EV kit comes installed with the MAX15062AATA+ Caution: Do not turn on the power supply until all in an 8-pin (2mm x 2mm) lead(Pb)-free/RoHS-compliant connections are completed. TDFN package. 1) Set the power supply at a voltage between 4.5V and 60V. Then, disable the power supply. Features 2) Connect the positive terminal of the power supply to 4.5V to 60V Input Voltage Range (Note 1) the VIN PCB pad and the negative terminal to the 3.3V Output, 300mA Continuous Current nearest GND PCB pad. Connect the positive terminal Internal Compensation of the 300mA load to the VOUT PCB pad and the neg- ative terminal to the nearest GND PCB pad. EN/UVLO for On/Off Control and Programmable Input Undervoltage Lockout 3) Connect the Multimeter across the VOUT PCB pad and the nearest GND PCB pad. 90% Peak Efficiency 4) Verify that shunts are installed on jumpers JU1 and 500kHz Fixed-Frequency PWM Operation JU2 (EN/UVLO). PFM or Forced-PWM Mode of Operation 5) Verify that shunt is open on jumpers JU3 for PFM Hiccup Mode Overcurrent Protection mode of operation. Open-Drain RESET Output 6) Turn on the DC power supply. Thermal Shutdown 7) Enable the load. Proven PCB Layout 8) Verify that the multimeter displays 3.3V. Fully Assembled and Tested Ordering Information appears at end of data sheet. Note 1: In PWM mode, operation at input voltages greater than 51V can cause the converter to reach its minimum controllable ON time (t ), resulting in the increased inductor current on-min ripple and output voltage ripple, especially at light load conditions. However, the average output voltage is regulated. 19-6637 Rev 1 4/19MAX15062AEVKIT Evaluates: MAX15062A Evaluation Kit Active-Low Open-Drain Detailed Description Reset Output (RESET) The MAX15062AEVKIT is a fully assembled and tested The EV kit provides a RESET PCB pad to monitor the sta- circuit board that demonstrates the performance of the tus of the RESET output. RESET goes high when VOUT MAX15062A 60V, 300mA ultra-small, high-efficiency, rises above 95% (typ) of its nominal regulated output synchronous step-down converter. The EV kit oper- voltage. When VOUT falls below 92% (typ) of its nominal ates over a wide 4.5V to 60V input voltage range, and regulated voltage, RESET is pulled low. provides up to 300mA at the preset 3.3V output. The device features undervoltage lockout, overcurrent pro- Mode of Operation tection, and thermal shutdown. The EV kit switches The EV kit features fixed frequency PWM mode and at a fixed frequency of 500kHz, and delivers a peak PFM mode of operation for higher efficiency at light-load efficiency of 90% with the supplied components. conditions. The mode can be selected by programming The EV kit includes an EN/UVLO PCB pad and jump- the jumper JU3 on the EV kit. Install a shunt on JU3 to ers JU1 and JU2 to enable control of the converter operate in PWM mode, leave JU3 in open position for output. Jumper JU3 allows the selection of the mode of PFM mode of operation. The EV kit is set to PFM mode of operation based on light load-performance requirements. operation by default. Refer to the MAX15062 data sheet An additional RESET PCB pad is available for monitoring for more details on the modes of operation. whether the converter output is in regulation or not. Hot Plug-In and Long Input Cables Enable/Undervoltage-Lockout (EN/UVLO) The MAX15062AEVKIT PCB layout provides an optional Programming electrolytic capacitor (C1 = 22F/100V). This capacitor The MAX15062 offers an Enable and adjustable input limits the peak voltage at the input of the MAX15062 when undervoltage-lockout feature. In this EV kit, for normal the DC input source is Hot-Plugged to the EV kit input operation, leave EN/UVLO jumpers (JU1 and JU2) with terminals with long input cables. The equivalent series shunts installed. When JU1 and JU2 have shunts installed, resistance (ESR) of the electrolytic capacitor dampens the MAX15062 is enabled when the input voltage rises the oscillations caused by interaction of the inductance of above 4.5V. To disable MAX15062, install a jumper on JU2 the long input cables, and the ceramic capacitors at the and keep JU1 in an open position. See Table 1 for JU1 buck converter input. settings. The EN/UVLO PCB pad on the EV kit supports external Enable/Disable control of the device. Leave JU1 Table 1. Converter EN/UVLO Jumper and JU2 open when external Enable/Disable control is (JU1 & JU2) Settings desired. A potential divider formed by R1 and R2 sets the input voltage (V ) above which the converter is enabled INU SHUNT when JU1 and JU2 are closed. EN/UVLO VOUT POSITION PIN OUTPUT Choose R1 to be 2.2M (max) and then calculate R2 as JU1 JU2 follows: 1-2 Open Connected to VIN Enabled R1 1.215 R2 = Open 1-2 Connected to GND Disabled V 1.215 ( ) INU Connected to Enabled at 1-2* 1-2 midpoint of the R1, R2 where, V = Voltage at which the device is required to INU VIN 4.5V resistor-divider turn on, and R1 and R2 are in k. Refer to the Enable Input (EN/UVLO) Soft-Start section *Default position. in the MAX15062 data sheet for additional information on Table 2. Mode Selection Jumper (JU3) setting the UVLO threshold voltage. Settings SHUNT MODE OF MODE PIN POSITION OPERATION 1-2 Connected to GND Forced PWM Open* Unconnected PFM *Default position. Maxim Integrated 2 www.maximintegrated.com