Evaluates: MAX38801 MAX38801 Evaluation Kit General Description Features The MAX38801 evaluation kit (EV kit) serves as a reference High-Efficiency Solution platform for evaluating the MAX38801 voltage regulator IC. Up to 96% Peak This single-chip, integrated switching regulator provides an Up to 92% Full-Load extremely compact, highly efficient, fast, accurate, and Up to 94% Light-Load Efficiency at 1A with DCM reliable power delivery solution for low-output voltage Enabled applications. The MAX38801 has different programmability Inductor Valley Current Limit is Configured to 12A options to enable a wide range of configurations. (R SEL = R1 = 46.4k) The EV kit consists of a fully-assembled and tested Printed Programmable Switching Frequency from 400kHz Circuit Board (PCB) implementation of the MAX38801. to 900kHz Jumpers, test points and input/output connectors are Programmable Positive and Negative OCP Limit included for flexibility and ease-of-use. Refer to the data sheet for ordering information and more details. Programmable Reference Voltage with External Input Option Applications Fast Transient Response with Quick PWM Servers/Servers Architecture I/O and Chipset Supplies Differential Remote Sense with Open-Circuit GPU Core Supply Detection DDR MemoryVDDQ and VTT Point-of-Load (PoL) Applications Percentage-Based Output Power Good and OVP Open-Drain Status Indicator (STAT) Pin Input Undervoltage and Overvoltage Lockout Ordering Information appears at end of data sheet. Adaptive Dead Time Control Integrated Boost Switch 19-Bump WLCSP (2.2mm x 2.8mm) Footprint Operation Using Ceramic Input and Output Capacitors Quick PWM is a trademark of Maxim Integrated Products, Inc. 319-100062 Rev 1 5/18Evaluates: MAX38801 MAX38801 Evaluation Kit connected between J12-2 and ground. The same signal Quick Start should be connected to J10 (1-2) to pull up the OE pin. Required Equipment Regulator enable MAX38801 EV kit To enable the regulator, OE pin needs to be pulled high. 12V, 10A DC power supply If the on-board 1.8V LDO is active (the shunt on jumper Load capable of sinking 12A J4 is in place), the output voltage can be used for the pur- Digital voltmeter pose. Installing a shunt on J15 (4-6) pulls the OE signal high to 1.8V through a 20k resistor. To shut down the Oscilloscope regulator a shunt needs to be installed on J10. This forces Procedure the OE pin low. The EV kit is fully assembled and tested. Follow the steps Status Pin below to verify the board operation. Caution: Do not turn The MAX38801 has an open collector status (STAT) output on power supply until all connections are completed. to report fault or output under voltage event. Install a shunt 1) Connect a 12V power supply to the VDD1 and GND1 on J15 (3-5) to pull up this pin to V through a 20k resistor. CC banana jacks. Since STAT pin is 3.3V tolerant, a shunt on J15 (1-3) can 2) Make sure the shunt is installed on: be installed to pull up this pin through a 20k resistor to the a) J16 (1-2) to close the sense line. 3.3V provided by the on board regulator U3 (install a shunt on J5 (3-4) to enable the LDO). b) J4 (1-2) to power up the on-board LDO which regulates 1.8V. Scenario Selection c) J12 (1-2) to provide the 1.8V bias supply to the Several parameters of the MAX38801 can be regulator from the on-board LDO. programmed to allow optimization for specific applications. d) J15 (3-5) to pull up the STAT pin. By selecting the appropriate value of resistor R SEL (R1) e) J15 (4-6) to pull up the OE pin. and capacitor C SEL (C4), the optimum set of parameters 3) Connect a voltmeter to the VOUT and GND banana (scenario) can be programmed. jacks (J8, J11, J13, and J14 can be used as well). While R SEL selects the proper scenario, C SEL determines 4) Turn on the power supply. the nominal F . The MAX38801 features a configuration SW 5) Verify that the voltmeter reads 1.05V. table to provide a wide range of options. Table 1 shows the scenario table for MAX38801. Detailed Description of Hardware The MAX38801 provides compact high-efficiency power delivery for precision outputs that demand fast transient response. The 19-ball (2.2mm x 2.8mm) CSP package mini- mizes the PCB area. The EV kit is preset for 1.05V output and can provide up to 12A from a 6.5V to 14V input supply. Bias Supply The MAX38801 EV kit has an on-board LDO (U2) that can provide the required 1.8V VCC bias voltage to the regulator as well as the pull up voltage for the Output Enable (OE) input. This allows testing the part using a single external power supply. To enable the on-board LDO install the shunt on jumper J4. To effectively use the LDO to supply the VCC bias voltage to the regulator also install the shunt on jumper J12. In order to properly measure the efficiency of the regulator, the LDO should not be active. To disable it, both the shunts on J4 and J12 need to be removed. An external 1.8V, 0.1A current limited power supply needs to be Maxim Integrated 2 www.maximintegrated.com