MAX20003EVKIT#

MAX20003 Evaluation Kit General Description The MAX20003 evaluation kit (EV kit) demonstrates the MAX20002/MAX20003 high-voltage, current-mode stepdown converters with low operating current. The EV kit operates over a wide 3.5V to 36V input range and the output is set for 5V at 3A. The EV kit comes with the MAX20003ATPA/V+ installed. Features and Benefits ●● Wide 3.5V to 36V Input Supply Range ●● Forced-PWM or Skip-Mode Operation ●● Programmable Switching Frequency ●● Power-Good Output ●● Proven PCB Layout ●● Fully Assembled and Tested Ordering Information appears at end of data sheet. Evaluates: MAX20002/MAX20003 Table 1. EN Configuration (JU1) SHUNT POSITION DESCRIPTION 1-2* Connects the EN pin to the voltage at SUP for normal operation 2-3 Connects the EN pin to ground to enter shutdown mode *Default position. Table 2. Mode of Operation (JU2) SHUNT POSITION MODE PIN 1-2* Connected to BIAS Forced-PWM mode 2-3 Connected to AGND Skip mode Connected to an external clock Forced-PWM mode (device syncs to an external clock) Not installed MODE Quick Start *Default position. Required Equipment Table 3. Spread Spectrum (JU3) ● MAX20003 EV kit ● 14V, 2A DC power supply ● Electronic load capable of 3A ● Digital voltmeter (DVM) Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on supplies until all connections are made. 1) Verify that jumpers JU1–JU4 are in their default positions, as shown in Tables 1–4. 2) Connect the power supply between the SUPSW and nearest PGND test points. 3) Connect the 3A electronic load between the OUT and nearest PGND test points. 4) Connect the DVM between the OUT and nearest PGND test points. 5) Turn on the power supply. 19-7413; Rev 0; 5/14 SHUNT POSITION MODE PIN 1-2* Connected to BIAS Spread-spectrum enabled 2-3 Connected to PGND Spread-spectrum disabled MODE *Default position. Table 4. PGOOD (JU4) SHUNT POSITION Installed Not installed MODE PGOOD pulled high to VL PGOOD unconnected 6) Enable the electronic load. 7) Verify that the voltage at the OUT test point is approximately 5V. MAX20003 Evaluation Kit Detailed Description of Hardware The MAX20003 EV kit demonstrates the MAX20003 highvoltage, high-frequency, step-down converter with low operating current. The EV kit operates over a wide 3.5V to 36V input range and the output is set for 5V at 3A. Enable (EN) Place a shunt in the 1-2 position on jumper JU1 for normal operation. To place the device into shutdown mode, move the shunt on JU1 to the 2-3 position. Synchronization Input (FSYNC) The EV kit features jumper JU2 to control the synchronization input (FSYNC). The device synchronizes to an external signal applied to FSYNC. Connect FSYNC to AGND to enable skip-mode operation. Connect to BIAS or to an external clock to enable fixed-frequency forcedPWM mode operation. Evaluates: MAX20002/MAX20003 Power-Good Output (PGOOD) The EV kit provides a PGOOD test point to monitor the status of the device output. PGOOD asserts when VOUT rises above 95% of its regulation voltage. PGOOD deasserts when VOUT drops below 92.5% of its regulation voltage. Output Connect FB to BIAS for a fixed +5V (EV kit default output) or a fixed +3.3V output voltage. To set the output to other voltages between 1V and 10V, connect a resistive divider from output (OUT) to FB to AGND. Use the following formula to determine the R7 and R8 of the resistive divider network: where VFB = 1V. V  R7 = R8 ×  OUT − 1 V  FB  To use an external clock, uninstall the shunt on JU2 and apply the signal at the FSYNC test point. The external clock frequency at FSYNC can be higher or lower than the internal clock by 20%. Ensure that the duty cycle of the external clock used has a minimum 100ns pulse width. Operation at 400kHz Switching Frequency Spread-Spectrum Option (SPS) ●● L1 = 6.8µH (recommend Coilcraft XAL5050-682MEB) The EV kit provides jumper JU3 that allows SPS to be pulled high (VL) or pulled low (PGND). Connect SPS high to enable spread spectrum where the operating frequency is varied ±3% centered on FOSC. Connect SPS low to disable the spread-spectrum feature. Setting the Switching Frequency (FOSC) For 400kHz switching frequency, the following components need to be changed to: ●● R4 = 73.2kΩ ●● R1 = 16.5kΩ ●● C10 = 4,700pF ●● C11 = 6.8pF Additional capacitance on C7 and C8 may be needed, depending on transient performance. The EV kit switching frequency is set by a resistor, RFOSC (R4), connected from FOSC to AGND. Refer to TOC 08 in the Typical Operating Characteristics section in the MAX20002/MAX20003 IC data sheet for the correct RFOSC (R4) value. www.maximintegrated.com Maxim Integrated │  2 Evaluates: MAX20002/MAX20003 MAX20003 Evaluation Kit Component List DESIGNATION QTY DESCRIPTION 1 47µF ±20%, 50V aluminum electrolytic capacitor (8.00mm x 6.20mm) Panasonic EEE-FK1H470P C2 1 4.7µF ±10%, 50V X7R ceramic capacitor (1210) Murata GCM32ER71H475KA55L C3, C5 2 0.1µF ±10%, 50V X7R ceramic capacitors (0603) Murata GCM188R71H104KA57D C4 1 2.2µF ±10%, 50V X7R ceramic capacitor (0805) TDK C2012X7R1H2225K125AC C6, C14, C15 3 0.1µF ±10%, 50V X7R ceramic capacitors (0402) TDK CGA2B3X7R1H104K050BB 2 22µF ±10%, 10V X7R ceramic capacitors (1210) Murata GCM32ER71A226KE12L C1 C7, C8 1 2.2µF ±10%, 10V X7R ceramic capacitor (0603) Murata GRM188R71A225K 2 1,000pF ±10%, 50V X7R ceramic capacitors (0402) Murata GRM155R71H102K C11 1 10pF ±5%, 50V C0G ceramic capacitor (0402) Murata GRM1555C1H100J C12, C17 0 Not installed, ceramic capacitors (0402) C9 C10, C16 DESIGNATION QTY DESCRIPTION C13 0 Not installed, ceramic capacitor (0603) JU1–JU3 3 3-pin headers JU4 1 2-pin header L1 1 2.2µH, 9.2A inductor (5.5mm x 5.7mm) Coilcraft XAL5030-222MEB L2 1 Ferrite bead (1206) Würth 742792141 PGND 2 Black test points PGOOD, SUP, SUPSW, VOUT 4 Red test points R1 1 20.0kΩ ±1% resistor (0402) R2, R6, R11 3 0Ω ±5% resistors (0402) R3 1 100kΩ ±5% resistor (0402) R4 1 12.1kΩ ±1% resistor (0402) R5 1 10kΩ ±5% resistor (0402) R7, R8, R10 0 Not installed, resistors (0402) R9 1 0Ω ±5% resistors (1210) U1 1 Automotive buck converter (20 TQFN-EP*) Maxim MAX20003ATPA/V+ — 4 Shunts — 1 PCB: MAX20003 EVALUATION KIT *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Coilcraft Inc. 847-639-6400 www.coilcraft.com Murata Americas 770-436-1300 www.murataamericas.com Panasonic Corp. 800-344-2112 www.panasonic.com Würth Electronik GmbH & Co. KG 201-785-8800 www.we-online.com Note: Indicate that you are using the MAX20003 when contacting these component suppliers. www.maximintegrated.com Maxim Integrated │  3 Evaluates: MAX20002/MAX20003 MAX20003 Evaluation Kit L2* FERRITE BEAD SUPSW C14* 0.1µF C15* 0.1µF BST 15 N.C. 19 R2 0Ω 8 SUPSW C16* 1,000pF C1 47µF C2 4.7µF *- These components are populated on the EVKIT to provide front-end filtering C3 0.1µF C6 0.1µF LX 16 LX 17 LX 18 L1 2.2µH VSUP C17 OPEN 10 SUP SUP C4 2.2µF C5 0.1µF AGND C7 22µF 5 VL C9 2.2µF MAX20003+ U1 R7 OPEN R1 20.0kΩ VSUP 1 C10 1,000pF 7 EN PGND C12 OPEN FB 3 COMP 4 6 AGND JU1 2 C8 22µF R11 0Ω OUT 2 VL VL C13 OPEN VOUT R10 OPEN 9 SUPSW R9 0Ω R8 OPEN R6 0Ω VL C11 10pF 3 VL VL JU3 2 JU4 12 SPS R5 10kΩ 3 PGOOD R4 12.1kΩ PGND R3 100kΩ PGOOD 11 EP 20 FSYNC 14 PGND 1 JU2 2 13 PGND 3 1 FOSC VL 1 Figure 1. MAX20003 EV Kit Schematic www.maximintegrated.com Maxim Integrated │  4 MAX20003 Evaluation Kit Figure 2. MAX20003 EV Kit Component Placement Guide— Component Side Evaluates: MAX20002/MAX20003 Figure 3. MAX20003 EV Kit PCB Layout—Component Side Figure 4. MAX20003 EV Kit PCB Layout—Layer 2 www.maximintegrated.com Maxim Integrated │  5 MAX20003 Evaluation Kit Figure 5. MAX20003 EV Kit PCB Layout—Layer 3 Evaluates: MAX20002/MAX20003 Figure 6. MAX20003 EV Kit PCB Layout—Solder Side Figure 7. MAX20003 EV Kit Component Placement Guide— Solder Side www.maximintegrated.com Maxim Integrated │  6 MAX20003 Evaluation Kit Evaluates: MAX20002/MAX20003 Ordering Information PART MAX20003EVKIT# TYPE EV Kit #Denotes RoHS compliant. www.maximintegrated.com Maxim Integrated │  7 MAX20003 Evaluation Kit Evaluates: MAX20002/MAX20003 Revision History REVISION NUMBER REVISION DATE 0 5/14 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. ©  2014 Maxim Integrated Products, Inc. │  8