MAX15462BEVKIT#

Evaluates: MAX15462B MAX15462B Evaluation Kit General Description The MAX15462B evaluation kit (EV kit) is a fully assembled and tested circuit board that demonstrates the performance of the MAX15462B 42V, 300mA ultra-small, high-efficiency, synchronous step-down converter. The EV kit operates over a wide 6.5V to 42V input voltage range, and provides up to 300mA at the preset 5V output. The device features undervoltage lockout, overcurrent protection, and thermal shutdown. The EV kit switches at a fixed frequency of 500kHz, and delivers a peak efficiency of 92% with the supplied components. The EV kit comes installed with the MAX15462BATA+ in an 8-pin (2mm x 2mm) lead(Pb)-free/RoHS-compliant TDFN package. Benefits and Features ●● 6.5V to 42V Input Voltage Range ●● 5V Output, 300mA Continuous Current ●● Internal Compensation ●● EN/UVLO for On/Off Control and Programmable Input Undervoltage Lockout ●● 92% Peak Efficiency ●● 500kHz Fixed-Frequency PWM Operation ●● PFM or Forced-PWM Mode of Operation ●● Hiccup Mode Overcurrent Protection ●● Open-Drain RESET Output ●● Thermal Shutdown ●● Proven PCB Layout ●● Fully Assembled and Tested Ordering Information appears at end of data sheet. 19-7562; Rev 0; 3/15 Quick Start Recommended Equipment ●● MAX15462B 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 and JU2 (EN/UVLO). 2) Verify that jumper JU3 (MODE PFM operation) is open. 3) Set the electronic load to constant-current mode, 300mA, and disable the electronic load. 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. 7) Connect the 24V power supply output to the VIN PCB pad. Connect the supply ground to the GND PCB pad. 8) Turn on the power supply and verify that VOUT is at 5V with respect to GND. 9) Enable the electronic load and verify that VOUT is at 5V with respect to GND. Evaluates: MAX15462B MAX15462B Evaluation Kit Detailed Description The MAX15462B EV kit is a fully assembled and tested circuit board that demonstrates the performance of the MAX15462B 42V, 300mA ultra-small, high-efficiency, synchronous step-down converter. The EV kit operates over a wide 6.5V to 42V input voltage range, and provides up to 300mA at the preset 5V output. The device features undervoltage lockout, overcurrent protection, and thermal shutdown. The EV kit switches at a fixed frequency of 500kHz, and delivers a peak efficiency of 92% with the supplied components. The EV kit includes an EN/UVLO PCB pad and jumpers JU1 and 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. Enable Control (JU1, JU2) The EN/UVLO pin of 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 pins 1-2 on jumper JU2 to disable VOUT. See Table 1 for proper jumper settings. 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. When VOUT falls below 92% (typ) of its nominal regulated voltage, RESET is pulled low. 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 forced-PWM operation. Keep JU3 open to enable light-load PFM operation. See Table 2 for proper JU3 configuration. Table 1. Enable Control (EN/UVLO) SHUNT POSITION EN/UVLO PIN VOUT OUTPUT Connected to VIN Enabled 1-2 Connected to GND Disabled 1-2* Connected to midpoint of the R1, R2 resistor-divider Enabled at VIN ≥ 6.5V SHUNT POSITION MODE PIN MODE OF OPERATION 1-2 Connected to GND Forced PWM Open* Unconnected PFM JU1 JU2 1-2 Open Open 1-2* *Default position. Table 2. Mode Control (JU3) *Default position. www.maximintegrated.com Maxim Integrated │  2 Evaluates: MAX15462B MAX15462B Evaluation Kit EV Kit Performance Report EFFICIENCY vs. LOAD CURRENT 100 toc01 100 50 VIN = 36V 70 VIN = 12V VIN = 24V 60 50 VIN = 36V 40 30 40 20 30 10 PFM MODE 1 10 0 100 LOAD CURRENT (mA) OUTPUT VOLTAGE vs. LOAD CURRENT 5.003 PWM MODE 0 50 100 150 200 250 VIN = 12V 5.04 VIN = 36V 5.02 5 4.98 300 VIN = 24V 5.06 0 50 100 150 200 250 300 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) MAX15462B EV toc06 MAX15462B EV toc05 toc04 toc03 PFM MODE 5.08 OUTPUT VOLTAGE (V) VIN = 12V VIN = 24V 60 EFFICIENCY (%) EFFICIENCY (%) 70 OUTPUT VOLTAGE vs. LOAD CURRENT 5.1 80 80 PWM MODE 5.002 5.001 VIN = 24V VOUT (AC) 100mV/div VOUT (AC) 100mV/div IOUT 100mA/div IOUT 100mA/div VIN = 36V 5 4.999 4.998 4.996 VIN = 12V 0 50 100 150 200 250 300 20µs/div 100µs/div LOAD CURRENT (mA) LOAD TRANSIENT RESPONSE— PWM MODE (LOAD CURRENT STEPPED FROM NO LOAD TO 150mA) SOFT-START MAX15462B EV toc07 BODE PLOT MAX15462B EV toc08 50 EN/UVLO 5V/div VOUT (AC) 100mV/div 40 20µs/div 36 0 0 -10 www.maximintegrated.com IOUT 100mA/div RESET 5V/div -36 -50 -72 fCR = 47kHz, PHASE MARGIN = 60° -40 1ms/div 72 10 -20 IOUT 100mA/div 108 PHASE 20 -30 180 144 GAIN 30 VOUT 1V/div MAX15462B EV toc09 2 1 4 6 81 2 -108 4 6 81 10 FREQUENCY (kHz) 100 2 -144 -180 Maxim Integrated │  3 PHASE (°) 4.997 GAIN (dB) OUTPUT VOLTAGE (V) toc02 90 90 20 EFFICIENCY vs. LOAD CURRENT Evaluates: MAX15462B MAX15462B Evaluation Kit 1.0’’ Figure 1. MAX15462B EV Kit Component Placement Guide— Component Side 1.0’’ Figure 2. MAX15462B EV Kit PCB Layout—Component Side 1.0’’ Figure 3. MAX15462B EV Kit PCB Layout—Solder Side www.maximintegrated.com Maxim Integrated │  4 Evaluates: MAX15462B MAX15462B Evaluation Kit Component Suppliers SUPPLIER WEBSITE Coilcraft, Inc. www.coilcraft.com Murata Americas www.murata.com Panasonic Corp. www.panasonic.com Note: Indicate that you are using the MAX15462B when contacting these component suppliers. Component Information and Schematic See the following links for component information and schematic: ●● MAX15462B EV BOM Ordering Information PART MAX15462BEVKIT# #Denotes RoHS compliant. TYPE EVKIT ●● MAX15462B EV Schematic www.maximintegrated.com Maxim Integrated │  5 Evaluates: MAX15462B MAX15462B Evaluation Kit Revision History REVISION NUMBER REVISION DATE 0 3/15 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 5.5V to 42V BILL OF MATERIALS (BOM) Revision 3/15 Serial No. 1 2 3 4 5 6 7 8 Description 22µF, 50V Electrolytic capacitors (6.6mm x 6.6mm case size) CAP,1µF,10%,50V,X7R,1206 CAP,1µF,10%,6.3V,X7R,0603 CAP,10µF,10%,6.3V,X7R,1206 INDUCTOR,47µH, 560mA RES#,3.32MΩ,1%,0402 RES+,768KΩ,1%,0402 RES+,100KΩ,1%,0402 Quantity Designator Part Number 1 C1 PANASONIC EEEFK1H220P 1 1 1 1 1 1 1 C2 C3 C4 L1 R1 R2 R3 MURATA GRM31MR71H105K MURATA GRM188R70J105K MURATA GRM31CR70J106K COILCRAFT LPS4018-473ML MAXIM MAX15462BATA+ 9 42V, 300mA, High Efficiency, Integrated MOSFET, Synchronous Step-Down Regulator (8 TDFN) 1 U1 10 2 Pin Headers(0.1in centers) 3 JU1, JU2, JU3 11 SHORTING JUMPER, 2 POSITION, 0.1 CENTER 3 SU1-SU3 Jumper Table JUMPER JU1 JU2 JU3 SHUNT POSITION 1,2 SHORT 1,2 SHORT OPEN Sullins STC02SYAN