MAX15462C12EVKIT#

MAX15462C 12V Evaluation Kit General Description The MAX15462C 12V evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the performance of the MAX15462C 42V, 300mA ultra-small, high-efficiency, synchronous step-down converter. The EV kit operates over a wide input voltage range of 14V to 42V, and provides up to 300mA load current at 12V output voltage. The device features undervoltage lockout, overcurrent protection, and thermal shutdown. The EV kit switches at a frequency of 500kHz, and delivers a peak efficiency of 95% with the supplied components. The EV kit comes installed with the MAX15462CATA+ in an 8-pin (2mm x 2mm) lead(Pb)-free/RoHS-compliant TDFN package. Evaluates: MAX15462C in 12V Output Voltage Application Quick Start Recommended Equipment ●● MAX15462C 12V EV kit ●● 42V adjustable, 0.5A DC power supply ●● Electronic load up to 300mA ●● Voltmeter Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) Verify that shunts are installed on jumpers JU1, JU2 (EN/UVLO). Features and Benefits 2) Verify that jumper JU3 (MODE-PFM operation) is open. ●● 12V Output, 300mA Continuous Current 3) Set the electronic load to constant-current mode, 300mA, and disable the electronic load. ●● 14V to 42V Input Voltage Range ●● Internal Compensation ●● EN/UVLO for On/Off Control and Programmable Input Undervoltage Lockout ●● 95% Peak Efficiency ●● 500kHz Switching Frequency ●● PFM or Forced-PWM Mode of Operation ●● Hiccup Mode Overcurrent Protection 4) Connect the electronic load’s positive terminal to the VOUT PCB pad. Connect the negative terminal to the GND PCB pad. 5) Connect the voltmeter across the VOUT and GND PCB pads. 6) Set the power-supply output to 24V. Disable the power supply. ●● Open-Drain RESET Output 7) Connect the 24V power-supply output to the VIN PCB pad. Connect the supply ground to the GND PCB pad. ●● Thermal Shutdown 8) Turn on the power supply. ●● Lead-Free, 8-Pin, 2mm x 2mm TDFN Package 9) Enable the electronic load and verify that output voltage is at 12V with respect to GND. ●● Proven PCB Layout ●● Fully Assembled and Tested Ordering Information appears at end of data sheet. 19-7563; Rev 0; 3/15 10) Vary the input voltage from 14V to 42V. 11) Vary the load current from 1mA to 300mA and verify that output voltage is 12V. Evaluates: MAX15462C in 12V Output Voltage Application MAX15462C 12V Evaluation Kit Detailed Description The MAX15462C 12V EV kit is a fully assembled and tested circuit board that demonstrates the performance of the MAX15462C 42V, 300mA ultra-small, high-efficiency, synchronous step-down converter. The EV kit operates over a wide input voltage range of 14V to 42V, and provides up to 300mA load current at 12V output voltage. The device features undervoltage lockout, overcurrent protection, and thermal shutdown. The EV kit switches at a frequency of 500kHz, and delivers a peak efficiency of 95% with the supplied components. The EV kit includes an EN/UVLO PCB pad and jumpers JU1, JU2 to enable control of the converter output. The MODE PCB pad and jumper JU3 are provided for selecting the mode of operation of the converter. The VCC PCB pad helps measure the internal LDO voltage. An additional RESET PCB pad is available for monitoring the open-drain logic output. The EV kit output voltage can be configured to 15V by installing the resistor R6 and the inductor L1 (alternate) included in the EV kit. Enable Control (JU1, JU2) The EN/UVLO pin on the device serves as an on/off control while also allowing the user to program the input undervoltage-lockout (UVLO) threshold. Jumpers JU1 and JU2 configure the EV kit’s output for turn-on/turn-off control. Install a shunt across jumper JU2 pins 1-2 to disable VOUT. See Table 1 for proper JU1, JU2 jumper configurations. Additionally, resistors R1 and R2 are included to set the UVLO to a desired turn-on voltage. Refer to the Enable Input (EN/UVLO), Soft-Start section in the MAX15462 IC data sheet for additional information on setting the UVLO threshold voltage. Active-Low, Open-Drain Reset Output (RESET) The EV kit provides a PCB pad to monitor the status of the RESET output. RESET goes high when VOUT rises above 95% (typ) of its nominal regulated output voltage. RESET goes low when VOUT falls below 92% (typ) of its nominal regulated voltage. PFM or Forced-PWM Mode (MODE) The EV kit includes a jumper (JU3) to program the mode of operation of the converter. Install a shunt across JU3 before powering up the EV kit to enable the forcedPWM operation. Keep JU3 open to enable the light-load PFM operation. See Table 2 for proper JU3 jumper configurations. Table 1. Enable Control (EN/UVLO) (JU1, JU2) SHUNT POSITION EN/UVLO PIN VOUT OUTPUT JU1 JU2 1-2 Open Connected to VIN Enabled Open 1-2 Connected to GND Disabled 1-2* 1-2* Connected to midpoint of R1, R2 resistor-divider Enabled at VIN ≥ 13V *Default position. Table 2. MODE Control SHUNT POSITION MODE PIN MODE OF OPERATION 1-2 Connected to GND Forced PWM Open* Unconnected PFM *Default position. www.maximintegrated.com Maxim Integrated │  2 Evaluates: MAX15462C in 12V Output Voltage Application MAX15462C 12V Evaluation Kit EV Kit Performance Report EFFICIENCY vs. LOAD CURRENT 100 toc01 100 12.35 70 VIN = 24V VIN = 18V 60 VIN = 36V VIN = 18V 70 OUTPUT VOLTAGE (V) 80 VIN = 24V 60 50 40 VIN = 36V 30 20 50 PFM MODE 1 10 100 toc03 PFM MODE 12.25 VIN = 18V 12.2 VIN = 24V 12.15 VIN = 36V 12.1 12.05 10 0 OUTPUT VOLTAGE vs. LOAD CURRENT 12.3 80 EFFICIENCY (%) EFFICIENCY (%) toc02 90 90 40 EFFICIENCY VS. LOAD CURRENT PWM MODE 0 50 100 150 200 250 12 300 0 50 100 150 200 250 300 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD-TRANSIENT RESPONSE—PFM MODE (LOAD CURRENT STEPPED FROM 5mA TO 150mA) LOAD-TRANSIENT RESPONSE—PFM OR PWM MODE (LOAD CURRENT STEPPED FROM 150mA TO 300mA) LOAD-TRANSIENT RESPONSE—PWM MODE (LOAD CURRENT STEPPED FROM NO LOAD TO 150mA) MAX15462C EV toc05 MAX15462C EV toc04 VOUT(AC) 200mV/div MAX15462CW EV toc06 VOUT(AC) 200mV/div VOUT(AC) 200mV/div IOUT 100mA/div IOUT 100mA/div IOUT 100mA/div 40µs/div SOFT-START 40µs/div MAX15462C EV toc07 BODE PLOT 50 GAIN 30 GAIN (dB) 108 PHASE 20 VOUT 5V/div 72 36 10 0 -10 -36 fCR = 36kHz, PHASE MARGIN = 66° -20 -72 -108 -30 -40 1ms/div 180 144 40 VEN/UVLO 5V/div IOUT 100mA/div VRESET 5V/div MAX15462C EV toc08 -50 PHASE (°) 100µs/div 4 1k 6 81 2 4 6 81 10k 100k 2 -144 -180 FREQUENCY (Hz) www.maximintegrated.com Maxim Integrated │  3 Evaluates: MAX15462C in 12V Output Voltage Application MAX15462C 12V Evaluation Kit 1’’ 1’’ Figure 1. MAX15462C 12V EV Kit Component Placement Guide—Component Side Figure 2. MAX15462C 12V EV Kit PCB Layout—Component Side 1’’ Figure 3. MAX15462C 12V EV Kit PCB Layout—Solder Side www.maximintegrated.com Maxim Integrated │  4 MAX15462C 12V Evaluation Kit Evaluates: MAX15462C in 12V Output Voltage Application Component Suppliers SUPPLIER WEBSITE Murata Americas www.murata.com Panasonic Corp. www.panasonic.com Wurth Electronik www.we-online.com Note: Indicate that you are using the MAX15462C when contacting these component suppliers. Component Information and Schematic See the following links for component information and schematic: ●● MAX15462C EV BOM ●● MAX15462C EV Schematic www.maximintegrated.com Ordering Information PART TYPE MAX15462C12EVKIT# EV Kit # Denotes RoHS compliant. Maxim Integrated │  5 Evaluates: MAX15462C in 12V Output Voltage Application MAX15462C 12V Evaluation Kit Revision History REVISION NUMBER REVISION DATE 0 03/15 DESCRIPTION Initial release PAGES CHANGED — For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2015 Maxim Integrated Products, Inc. │  6 BILL OF MATERIALS (BOM) Revision 3/15 Description 22µF, 50V Electrolytic capacitors (6.6mm x 6.6mm case size) Quantity Designator Part Number 1 C1 PANASONIC EEEFK1H220P CAP+,1µF,10%,50V,X7R,1206 1 C2 MURATA GRM31MR71H105K CAP+,1µF,10%,6.3V,X7R,0603 1 C3 MURATA GRM188R70J105K CAP+,4.7µF,10%,16V,X7R,1206 1 C4 MURATA GRM31CR71C475K INDUCTOR,100µH,620mA, 1 L1 Wurth 74408943101 RES+,2.20MΩ,1%,0402 1 R1 RES+,226KΩ,1%,0402 1 R2 RES+,100KΩ,1%,0402 1 R3 RES+,499KΩ,1%,0402 1 R4 RES+,40.2KΩ,1%,0402 1 R5 42V, 300mA, High Efficiency, Integrated MOSFET, Synchronous Step-Down Regulator (8 TDFN) 1 U1 2 Pin Headers(0.1in centers) 3 JU1, JU2, JU3 Jumper Table JUMPER JU1 JU2 SHUNT POSITION 1,2 SHORT 1,2 SHORT JU3 Connected to Pin1 only MAXIM MAX15462CATA+ 8 7 6 5 4 3 1 2 D D U1 MAX15462CATA+ VIN 14V TO 42V GND C1 22UF 50V + C 1 VIN C2 1UF 50V R1 2.2M 1% 2 JU1 2 EN/UVLO GND 7 FB 4 3 RESET VCC 6 MODE C3 1UF JU2 GND R4 499K 1% R5 40.2K 1% VCC 2 C 100UH VCC 1 B VOUT 12V,300mA L1 C4 4.7UF 16V 1 EN/UVLO LX 8 5 R3 100K MODE VCC R2 226K 1% B RESET 1% 1 JU3 2 A A PROJECT TITLE: MAX15462C12_EVKIT DRAWING TITLE: SIZE DATE: HARDWARE NUMBER: B ENGINEER: 02/25/2015 DRAWN BY: REV: TEMPLATE REV: B 8 7 6 5 4 3 2 A SHEET 2 OF 2 1