Click here to ask about the production status of specific part numbers. Evaluates: MAX25232 MAX25232 Evaluation Kit General Description Quick Start The MAX25232 evaluation kit (EV kit) provides a prov- Required Equipment en design to evaluate the MAX25232 2.1MHz/400kHz MAX25232 EV kit high-voltage mini-buck converter in a 12-pin side-wettable Power supply TDFN package. All components are rated for the automo- tive temperature range. Various test points and jumpers Voltmeter are included for evaluation. Electronic load The standard EV kit comes with the MAX25232ATCA/V+ Procedure installed (5V, 2.1MHz), but it can also be used to evalu- The EV kit is fully assembled and tested. Follow the steps ate other MAX25232 variants with minimal component below to verify board operation: changes (e.g., IC replacement of U1). 1) Verify that all jumpers are in their default positions, as Benefits and Features shown in Table 1. 3.5V to 36V Input Supply Range 2) Connect the positive and negative terminals of the power supply to the SUP and GND test pads, 5V or 3.3V Fixed Output Voltage, or Adjustable respectively. Between 1V and 10V 3) Connect the positive terminal of the voltmeter to OUT Delivers Up to 2.5A Output Current and the negative terminal to GND2. Frequency-Synchronization Input 4) Set the power supply to 14V and 2A current limit. Turn on the power supply. Enable Input 5) With the PU and LED headers shorted, the green Voltage-Monitoring PGOOD Output LED lights up. The voltmeter should display an output Proven PCB Layout voltage of 5V. Fully Assembled and Tested Ordering Information appears at end of data sheet. 319-100540 Rev 0 5/20Evaluates: MAX25232 MAX25232 Evaluation Kit Table 1. Default Jumper Settings JUMPER SHUNT POSITION FUNCTION EN ON-Middle Buck controller enabled SPS Middle-OFF Spread spectrum disabled PU, LED Installed PGOOD is pulled up by V when OUT is in regulation BIAS SYNC Middle-FPWM Forced-pulse-width-modulation (PWM) mode regulation. PGOOD is high impedance when the output Detailed Description voltage drops below 8% (typ) of its nominal regulated The MAX25232 EV kit provides a proven layout for voltage. evaluating all variants of the MAX25232 family of small, To obtain a logic signal, pull up PGOOD to V by current-mode-controlled buck converter ICs. Each device BIAS installing shunts on jumpers PU and LED. accepts input voltages as high as 36V and delivers up to 2.5A. The EV kit can handle an input-supply transient up Evaluating Other Variants to 40V. The EV kit comes installed with the fixed-output, 5V/2.1MHz Switching Frequency and External variant (MAX25232ATCA/V+) The 2.1MHz and 400kHz Synchronization variants can be installed and tested with minimal compo- The ICs can operate in two modes, forced-PWM or skip. nent changes. For the 2.1MHz variants, install the appropri- ate IC on the EV kit (U1), while keeping all other compo- Skip mode has better efficiency for light-load conditions. When SYNC is pulled low, the device operates in skip nents the same. For 400kHz parts, the inductor should be increased to 10H, and the output capacitance must be a mode for light loads, and in PWM mode for larger loads. When SYNC is pulled high, the device is forced to operate minimum 44F after derating is accounted for. in PWM across all load conditions. Setting the Output Voltage in the SYNC can be used to synchronize with other supplies if a Buck Converters clock source is present. The device is forced to operate in The output voltage in MAX25232 comes fixed internally. PWM when SYNC is connected to a clock source. Order the corresponding variant to get the desired out- put voltage (5V/3.3V). For other output voltage settings, Buck Output Monitoring (PGOOD) contact the factory. The EV kit provides a power-good output test point (PGOOD) to monitor the status of the buck output (OUT). PGOOD is low impedance when the output voltage is in Ordering Information PART TYPE MAX25232EVKIT 5V output, 2.1MHz EV kit Denotes RoHS compliant. Maxim Integrated 2 www.maximintegrated.com