Click here for production status of specific part numbers. Evaluates: MAXM17633/MAXM17634/ MAXM17633/MAXM17634/ MAXM17635 Modules in Application MAXM17635 Evaluation Kits General Description Features The MAXM17633/MAXM17634/MAXM17635 evaluation Wide 4.5V to 36V Input Range kits (EV kits) provide proven designs to evaluate the MAXM17633 Offers High 85.7% Efficiency performance of MAXM17633/MAXM17634/MAXM17635 (V = 24V, V = 3.3V, I = 1.5A) IN OUT OUT modules. Each of these modules operates over a wide MAXM17634 Offers High 90.6% Efficiency input range from 4.5V to 36V and delivers up to 2A output (V = 24V, V = 5V, I = 1.4A) IN OUT OUT current. The modules are configured to demonstrate opti - mum performance and component sizes in these EV kits. MAXM17635 Offers High 92.5% Efficiency (V = 24V, V = 12V, I = 1.8A) The MAXM17633 module delivers up to 2A, with a fixed IN OUT OUT 3.3V output. The module is configured to operate at Enable/UVLO Input, Resistor-Programmable 800kHz switching frequency, over a 4.5V to 36V input UVLO Threshold range. Selectable PWM, PFM, and DCM Modes of The MAXM17634 module delivers up to 2A, with a fixed Operation 5V output. The module is configured to operate at 1MHz Programmed 1ms Soft-Start Time switching frequency, over a 7V to 36V input range. Provision to Synchronize the Modules to the The MAXM17635 adjustable module is configured for a External-Clock Source 12V output, delivering up to 2A. The module is configured RESET Outputs, with Pullup Resistor to the to operate at a 1.8MHz switching frequency, over an 18V Respective V CC to 36V input range. Low-Profile, Surface-Mount Components The EV kits feature an adjustable input undervoltage lockout, adjustable soft-start, open-drain RESET sig- Proven PCB Layout nal, external frequency synchronization, and selectable Fully Assembled and Tested mode of operation (PWM/PFM/DCM). The MAXM17633/ Complies with CISPR22(EN55022) Class B MAXM17634/MAXM17635 module family data sheet Conducted and Radiated Emissions provides a complete description of the part that should be read in conjunction with this data sheet prior to operating Ordering Information appears at end of data sheet. the EV kits. 319-100449 Rev 0 10/19Evaluates: MAXM17633/MAXM17634/ MAXM17633/MAXM17634/ MAXM17635 Evaluation Kits MAXM17635 Modules in Application be adjusted to evaluate their performance under different Quick Start operating conditions. Required Equipment Setting Switching Frequency One 0V to 36V DC, 2A power supply Selection of switching frequency must consider input volt- Digital multimeters (DMM) age range, desired output voltage, t and t ON(MIN) OFF(MIN) Load resistors capable of sinking up to 2A at 3.3V, of the modules. Resistors (R103, R203, R303) on the 5V, and 12V EV kits program the desired switching frequencies of the modules. To optimize performance and component Equipment Setup and Procedure size in these EV kits, 800kHz switching frequency is The EV kits are fully assembled and tested. Follow the chosen for MAXM17633, 1MHz is chosen for MAXM17634, steps below to verify and test individual module operation: and 1.8MHz is chosen for MAXM17635. Use Table 1 and Caution: Do not turn on the power supply until all the Switching Frequency section of the MAXM17633/ connections are completed. MAXM17634/MAXM17635 data sheet to choose different values of resistors for programming the required switching 1) Disable the power supply and set the input pow- frequency. er supply at a voltage between 4.5V and 36V (for MAXM17633), or between 7V and 36V (for Enable/Undervoltage Lockout (EN/UVLO) MAXM17634), or between 18V and 36V (for Programming MAXM17635). The MAXM17633/MAXM17634/MAXM17635 EV kits offer 2) Connect the positive terminal and negative terminal an adjustable input undervoltage lockout level feature for of the power supply to the VIN pad and its adjacent the modules. In the EV kits, for normal operation, leave PGND pad of the module under evaluation. the jumpers (JU101, JU201, JU301) open. When jumper 3) Connect a 2A (max) resistive load across the VOUT JU101 is left open, the MAXM17633 is enabled when the pad and its nearest PGND pad of the corresponding input voltage rises above 4.05V. When jumper JU201 is module. left open, the MAXM17634 is enabled when the input voltage rises above 6.3V. When jumper JU301 is left 4) Verify that the shunts are not installed on jumpers open, the MAXM17635 is enabled when the input voltage (JU101, JU201, JU301). See Table 1 for details. rises above 16.2V. To disable the modules, install shunts 5) Select the shunt position on respective jumpers across pins 23 on jumpers (JU101, JU201, JU301). See (JU102, JU202, JU302) according to the required Table 1 for jumpers (JU101, JU201, JU301) settings. mode of operation. See Table 2 for details. A potential divider formed by the resistors R (R101, U 6) Verify that the shunt is at the default position on jumper R201, R301) and R (R102, R202, R302) sets the input B JU203. See Table 3 for details. voltage (V ) at which the module is enabled. INU 7) Connect digital multimeter (in voltage measurement Choose R (R101, R201, R301) to be 3.32M and then U mode) across the VOUT and its respective PGND pad. calculate R102, R202, and R302 as follows: 8) Turn on the input power supply. R 1.215 U 9) Verify that the digital multimeter displays the expected R = B V 1.215 ( ) terminal voltage with respect to PGND. INU For the MAXM17633 to turn on at the 4.05V input, Detailed Description the resistor (R102) is calculated to be 1.422M and a The MAXM17633/MAXM17634/MAXM17635 EV kits 1.43M resistor is used in the EV kit. are designed to demonstrate the salient features of the For the MAXM17634 to turn on at the 6.3V input, the MAXM17633/MAXM17634/MAXM17635 power modules. resistor (R202) is calculated to be 793.3k and a 787k The EV kit consists of typical application circuits of three resistor is used in the EV kit. different modules. Each of these circuits are electrically isolated from each other and hosted on the same PCB. Each For the MAXM17635 to turn on at the 16.2V input, the of the modules can be evaluated by powering them from resistor (R302) is calculated to be 269.2k and a 267k their respective input pins. Individual module settings can resistor is used in the EV kit. Maxim Integrated 2 www.maximintegrated.com