MAX38908EVK#TDFN Analog Devices

Click here for production status of specific part numbers. Evaluates: MAX38908 MAX38908 TDFN Evaluation Kit General Description Quick Start The MAX38908 TDFN evaluation kit (EV kit) evaluates Required Equipment the MAX38908 in a TDFN package. The MAX38908 is a MAX38908 TDFN EV kit low input voltage, high output current linear regulator. The 5.5V, 5A DC power supply (IN) EV kit operates over an input range of 0.9V to 5.5V and a bias voltage range from 2.7V to 20V. The EV kit provides 3V, 10mA DC power supply (BIAS) a resistor configurable output voltage range from 0.6V to Electronic load capable of 4A 5.0V. The EV kit can deliver up to 4A of current. Digital voltmeter (DVM) Features Procedure Evaluates the MAX38908 IC in a 14-pin The EV kit is fully assembled and tested. Follow the steps (3mm x 3mm) TDFN below to verify board operation. 0.9V to 5.5V Input Range Caution: Do not turn on power supply until all 2.7V to 20V Bias Voltage to Provide Wider Supply connections are completed. Options 1) Verify that jumper JU1 is shunted on pins 1 and 2 0.6V to 5.0V Resistor Configurable Output Voltage (EV kit enabled). (Default Output Set to 1V) 2) Connect the 5.5V power supply between the IN and Up to 4A Output Current nearest GND terminal posts. Proven 4-Layer 1-oz Copper PCB Layout 3) Connect the 3V (or higher, up to 20V) power supply between the BIAS and nearest GND terminal posts. Demonstrates Compact Solution Size 4) Connect the 4A electronic load between the OUT and Fully Assembled and Tested nearest GND terminal posts. 5) Connect the DVM between the OUT and nearest MAX38908 TDFN EV Kit Files GND terminal posts. FILE DECRIPTION 6) Turn on the power supply. MAX38908 TDFN EV Kit BOM EV Kit Bill of Material 7) Verify that the voltage at the OUT terminal post is 1V MAX38908 TDFN EV Kit PCB Layout EV Kit Layout within the device and the resistor dividers accuracy specifications. MAX38908 TDFN EV Kit Schematic EV Kit Schematic 8) Decrease the power supply to 1.3V (To minimize power dissipation at full load). 9) Enable the electronic load. 10) Verify that the voltage at the OUT terminal post is 1V within the device and the resistor dividers accuracy specifications. 319-100433 Rev 0 8/19Evaluates: MAX38908 MAX38908 TDFN Evaluation Kit Bias (BIAS) Detailed Description of Hardware The EV kit provides a bias input (BIAS) to accept an input The MAX38908 TDFN EV kit evaluates the MAX38908 voltage to control the LDOs regulating FET. The bias in a TDFN package. The MAX38908 is a low input input voltage must be at least 2V above the output voltage. voltage, high output current linear regulator that delivers (i.e., if V = 1.0V, then BIAS 3.0V, up to 20V) 4A of output current. This regulator requires only 300mV OUT of input-to-output headroom at full load. Power OK (POK) The MAX38908 TDFN EV kit operates over an input range The EV kit provides a power ok (POK) output to indicate of 0.9V to 5.5V and a bias voltage range from 2.7V to the device regulation status. The POK is open-drain and 20V. The EV kit comes with the MAX38908ATD+ installed requires a pullup resistor between 10k to 100k. The EV and the output voltage is set to 1V by 1% accurate kit POK is pullup to V through a 100k resistor R3 by OUT feedback resistors R1 and R2. The EV Kit output can default. The POK can also be pullup to V or an external IN be reconfigured to other voltages from 0.6V to 5.0V by voltage source. To pullup POK with V , remove resistor IN replacing feedback resistors R1 and R2. Refer to the R3 and install a resistor with the desired value to R4. MAX38908 IC data sheet for feedback resistor calculation. Component Suppliers EN (Enable) The EV kit provides a jumper JU1 to enable or disable the SUPPLIER WEBSITE MAX38908. See Table 1 for jumper setting of jumper JU1. Kemet www.kemet.com Murata/TOKO www.murata.com Table 1. EN (JU1) TDK www.tdk.com SHUNT POSITION DESCRIPTION Samsung Electro-Mechanics 1-2* Enabled. EN = IN* www.samsungsem.com America. Inc. 2-3 Disabled. EN = GND Note: Indicate that you are using the MAX38908 when contacting these component suppliers. *Default position. Ordering Information PART TYPE MAX38908EVK TDFN EV Kit Denotes RoHS Maxim Integrated 2 www.maximintegrated.com