Click here to ask about the production status of specific part numbers. Evaluates: MAX25308 MAX25308 Evaluation Kit General Description Quick Start The MAX25308 EV kit is a fully assembled and tested Required Equipment PCB intended to demonstrate the capability of the MAX25308 EV kit MAX25308 LDO regulator. The MAX25308 is a 3-out- 6V, 5A power supply put linear regulator family that delivers up to 600mA on Channel 1 and up to 300mA on channels 2 and 3 with only Appropriate resistive load, or an electronic load 37V of output noise from 10Hz to 100kHz. These RMS Multimeters regulators maintain 1.25% output accuracy over a wide input voltage range, requiring only 155mV (max) of input- Test setup to-output headroom at full load. The 1.95mA maximum no-load supply current is independent of dropout voltage. Connect jumper for each channel (E N 1:3 to IN 1:3 ) Each output is factory programmable between 0.6V to 3.7875V in 12.5mV steps. No external components are needed except for the input, output, and bypass capaci- tors. Each output has an independent enable input and RESET output. Load Up to 600mA Connect jumpers Features 1.7V to 5.5V Input Voltage Range DC source Factory-Selectable Output Voltage of 0.6V to Load Up to 300mA 3.7875V in 12.5mV Steps 1.95mA (Max) Operating Supply Current Connect jumper 70dB PSRR at 10kHz 600mA Maximum Output Current (OUT1) Connect jumper Load 300mA Maximum Output Current (OUT2/3) Up to 300mA 1.25% DC Accuracy Over Load, Line, and Temperature Ordering Information appears at end of data sheet. 319-100748 Rev 0 4/21Evaluates: MAX25308 MAX25308 Evaluation Kit Procedure Detailed Description of Hardware The EV kit comes fully assembled and tested. Follow the EV Kit Interface steps below to verify board operation. The Channel 1 inputs (IN1 and PGND1) are the main Channel 1 operation: input supply points. IN1 powers the common circuitry of the device. This requires power to IN1 to be supplied 1) Populate jumper (EN 1) between EN1 and IN1. before OUT2 and/or OUT3 can be turned on. Channel 2 2) Populate jumper RESETB1 to monitor power-good and Channel 3 can be supplied from either IN1 or exter- (RESETB) signal. nal supply. To use external supply at IN2 and/or IN3, 3) Connect 3.3V power supply between IN1 and remove jumpers IN 1-2 and/or IN 1-3 respectively, which PGND1 (set power-supply current limit to at least disconnects them from IN1 supply. VOUT1, VOUT2, and 2A). 4) Turn on power supply. VOUT3 (SMA connectors) can be used for output voltage measurement or noise measurement. MAX25308 EV kit 5) Measure input voltage at IN1 S test point. 6) Measure output voltage at OUT1 S and measure has exposed pads (IN1/2/3, OUT1/2/3, and GP (ground point)) to measure input and/or output voltage across RESETB1 signal at RESETB 1 test point. RESETB1 signal should be high (same as IN1). ceramic capacitors, which also can be used for probe measurements or PSRR measurement. Channel 2 operation: 1) Populate jumper IN 1-2. Evaluating IC Capabilities 2) Populate jumper (EN 2) between EN2 and IN2. The default device populated on the board is a 3) Populate jumper RESETB2 to monitor power-good MAX25308AATEA/V+. This is a 3-channel device. The (RESETB) signal. MAX25308 includes individual enable inputs for each 4) Connect 3.3V power supply between IN1 and output (EN1/EN2/EN3). Set EN 1/2/3 jumper to either PGND1 (set power-supply current limit to at least IN1/2/3 or GND to pull EN high or low, respectively. The 2A). MAX25308 includes an open-drain output, RESETB, 5) Turn on power supply. for each output that goes low to indicate that the output 6) Measure input voltage at IN2 S test point. It should voltage is out of regulation. The MAX25308 EV kit has a be the same as IN1. 10k pullup resistor from the RESETB pin to IN1, IN2, 7) Measure output voltage at OUT2 S and measure and IN3, respectivelyone for each channel. RESETB2 signal at RESETB 2 test point. RESETB2 signal should be high (same as IN2). Channel 3 operation: 1) Populate jumper IN 1-3. 2) Populate jumper (EN 3) between EN3 and IN3. 3) Populate jumper RESETB3 to monitor power-good (RESETB) signal. 4) Connect 5V power supply between IN1 and PGND1 (set power-supply current limit to at least 2A). 5) Turn on power supply. 6) Measure input voltage at IN3 S test point. It should be the same as IN1. 7) Measure output voltage at OUT3 S and measure RESETB3 signal at RESETB 3 test point. RESETB3 signal should be high (same as IN3). Maxim Integrated 2 www.maximintegrated.com