Evaluates: MAX20014 MAX20014 Evaluation Kit Procedure General Description The EV kit is fully assembled and tested. Follow the steps The MAX20014 evaluation kit (EV kit) is a fully assembled below to verify board operation. Caution: Do not turn on and tested PCB that demonstrates the MAX20014 power the power supply until all connections are completed. management IC (PMIC). The EV kit includes three high- efficiency, low-voltage DC-DC converters: OUT1 boosts a 1) Preset the power supply to 3.3V. Turn off the power 3.3V input to 5V at up to 500mA, while two synchronous supply. step-down converters (OUT2, OUT3) provide adjustable 2) Preset the electronic load to 500mA. Turn off the output voltages down to 0.8V at up to 3A. The 2.2MHz electronic load. switching-frequency operation allows for the use of all- 3) Connect the positive lead of the power supply to the ceramic capacitors and minimizes external components. VSUP PCB pad. Connect the negative lead of the The EV kits feature three on/off jumper controls, and three power supply to the PGND PCB pad. reset outputs to indicate output status for each converter. 4) Connect the positive terminal of the electronic load to It also provides SYNC input to select the operating mode the VOUT1 PCB pad. Connect the negative terminal (PWM, skip, or external synchronization). of the electronic load to the PGND1 PCB pad. Benefits and Features 5) Enable outputs V V by installing shunts on OUT1 OUT3 jumpers EN1EN3. 3.0V to 5.5V Operating Supply Voltage 6) Install a shunt on SYNC1 to enable forced-PWM 5V at 500mA Synchronous Boost Converter (OUT1) (FPWM) operation. 1.25V at 3A Synchronous Buck Converter (OUT2) 7) Turn on the power supply. 1.8V at 3A Synchronous Buck Converter (OUT3) 8) Verify that voltage across the VOUT1 and PGND1 Sync-Mode Select/Input for Forced-PWM/Skip Mode PCB pads is 5V 1%. Selection or External Frequency Synchronization 9) Verify that voltage across the RESET1 and PGND Individual RESET1RESET3 Outputs PCB pads is 3.3V. Minimal External Components 10) Turn on the electronic load. Proven PCB Layout 11) Verify that voltage across the VOUT1 and PGND1 Fully Assembled and Tested PCB pads is 5V 2%. 12) Turn off the electronic load. Quick Start 13) Remove the electronic load from the VOUT1 and Required Equipment PGND1 PCB pads. MAX20014 EV kit 14) Connect the positive terminal of the electronic load to Variable 6V power supply capable of supplying 5A the VOUT2 PCB pad. Connect the negative terminal of the electronic load to the PGND2 PCB pad. Preset Electronic load the electronic load to 3A. Two voltmeters 15) Verify that voltage across the VOUT2 and PGND2 PCB pads is 1.25V 2%. Ordering Information appears at end of data sheet. 16) Verify that voltage the across RESET2 and PGND PCB pads is 3.3V. 17) Turn on the electronic load. 18) Verify that the voltage across VOUT2 and PGND2 pads is 1.25V 3%. 19-8714 Rev 1 4/18MAX20014 Evaluation Kit Evaluates: MAX20014 19) Turn off the electronic load. Operation Mode 20) Remove the electronic load from VOUT2 and PGND2 The EV kit features a jumper (SYNC1) to configure the pads. device operation mode. Install a shunt on SYNC1 to enter FPWM mode. Remove the shunt on SYNC1 to 21) Connect the positive terminal of the electronic load to enable skip mode under light-load conditions. Connect an the VOUT3 PCB pad. Connect the negative terminal external clock with 1.8MHz to 2.6MHz frequency to of the electronic load to the PGND3 pad. Preset the synchronize the internal oscillator to an external clock. electronic load to 3A. Table 1 summarizes the functions of SYNC1. 22) Verify that the voltage across the VOUT3 and PGND3 PCB pads is 1.8V 2%. Enable Control (EN1EN3) The EN1EN3 jumpers are used to enable or disable 23) Verify that the voltage across the RESET3 and PGND V , V , and V , respectively. Install shunts PCB pads is 3.3V. OUT1 OUT2 OUT3 on EN1, EN2, or EN3 to enable V , V , or V OUT1 OUT2 OUT3 24) Turn on the electronic load. normal operation. Remove shunts on EN1, EN2, or EN3 25) Verify that the voltage across the VOUT3 and PGND3 to enter shutdown mode. See Table 2 for enable control. PCB pads is in the range of 1.8V 3%. Reset Outputs (RESET1RESET3) 26) Turn off the electronic load. The EV kit also include three RESET outputs to monitor 27) Turn off the power supply. V , V , and V output status. The RESET out- OUT1 OUT2 OUT3 put becomes high impedance and is pulled to V when SUP Detailed Description the corresponding output voltage is within the specified The MAX20014 EV kit integrates three high-efficiency, UV/OV range. RESET goes low when the corresponding low-voltage DC-DC converters: OUT1 is a synchronous output voltage is not within the specified UV/OV range. boost converter that boosts a 3.3V input to 5.0V at up to 500mA, while two synchronous step-down converters Table 1. Operation Mode (SYNC1) (OUT2 , OUT3) provide adjustable output voltages down to 0.8V at up to 3A. SHUNT POSITION MODE V V can be enabled/disabled by the ON FPWM OUT1 OUT3 EN1EN3 jumpers, respectively. The status of input OFF Skip voltage and output voltages is indicated by PV OV, and OFF (an external clock Synchronize to external RESET1RESET3. connected to SYNC pad) clock Adjustable Buck Output Voltage (V and V ) OUT2 OUT3 The buck outputs (V , V ) can be adjusted using Table 2. Enable Control (EN1EN3) OUT2 OUT3 the following procedure: SHUNT POSITION MODE 1) Choose R to be 100k or less. BOTTOM ON Normal Operation 2) Solve for R using: TOP OFF Shutdown R = R x (V /0.8V) - 1 TOP BOTTOM OUT 3) Install resistors R and R . R refers to TOP BOTTOM TOP R4/R6, while R refers to R3/R5 in the EV kit BOTTOM Ordering Information schematic. PART TYPE 4) The external feedback resistive divider must be MAX20014EVKIT EV Kit frequency compensated for proper operation. Place a capacitor across R in the resistive- TOP Denotes RoHS compliant. divider network. Use the equation below to de- termine the value of the feed-forward capacitor: C = 50 x R /R pF FF BOTTOM TOP Maxim Integrated 2 www.maximintegrated.com