MAX20079EVKIT#

Click here for production status of specific part numbers. Evaluates: MAX20079 MAX20079 Evaluation Kit General Description The MAX20079 evaluation kit (EV kit) provides a proven design to evaluate the MAX20079 2.1MHz/400kHz highvoltage mini-buck converter in a 20-pin Side-Wettable TQFN (SWTQFN) package. All components are rated for the automotive temperature range. Various test points and jumpers are included for evaluation. MAX20079EVKIT# comes with MAX20079AATP/VY+ installed (5V, 2.1MHz) and can be used to evaluate any MAX20079 variant with minimal component changes. Benefits and Features ●● 3.5V to 36V Input Supply Range ●● 5V or 3.3V Fixed Output Voltage, or Adjustable Between 3V and 10V ●● Delivers Up to 3.5A Output Current ●● Frequency Synchronization Input ●● Enable Input ●● Voltage-Monitoring PGOOD Output ●● Proven PCB Layout ●● Fully Assembled and Tested Ordering Information appears at end of data sheet. Quick Start Required Equipment ●● MAX20079 EV kit ●● Power Supply ●● Voltmeter ●● Electronic Load Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Verify that all jumpers are in their default positions, as shown in Table 1. 2) Connect the positive and negative terminals of the power supply to the SUP and GND test pads, respectively. 3) Connect the positive terminal of the voltmeter to OUT, and the negative terminal to GND2 4) Set the power supply to 14V and 3A current limit. Turn on the power supply. 5) The voltmeter should display an output voltage of 5V. 6) Connect an electronic load to OUT and GND2 terminals and set it to 1A. 7) Turn ON the electronic load and increase the current to 3.5A. The voltmeter should display the output voltage of 5V ±2%. Table 1. Default Jumper Settings 319-100273; Rev 0; 10/18 JUMPER SHUNT POSITION EN Middle-ON Buck controller enabled SPS Middle-OFF Spread spectrum disabled J1 Installed FSYNC Middle-FPWM FUNCTION PGOOD is pulled up by VBIAS when OUT is in regulation Forced-PWM mode Evaluates: MAX20079 MAX20079 Evaluation Kit Detailed Description The MAX20079 EV kit provides a proven layout for all variants of the MAX20079 synchronous buck regulator. The device accepts input voltages as high as 36V and delivers up to 3.5A. The EV kit can handle an input-supply transient up to 40V. Switching Frequency/ External Synchronization The devices can operate in two modes: forced-PWM or Skip. Skip mode has better efficiency for light-load conditions. When SYNC is pulled low, the device operates in skip mode for light loads and in PWM mode for larger loads. When SYNC is pulled high, the device is forced to operate in PWM across all load conditions. SYNC can be used to synchronize with other supplies if a clock source is present. The device is forced to operate in PWM when SYNC is connected to a clock source. Buck Output Monitoring (PGOOD) The EV kits provide a power-good output test point (PGOOD) to monitor the status of the buck output (OUT). PGOOD is low impedance when the output voltage is in regulation. PGOOD is high impedance when the output voltage drops below 8% (typ) of its nominal regulated voltage. To obtain a logic signal, pull up PGOOD to VBIAS by installing shunts on jumper PU. Evaluating Other Variants The EV kit comes installed with the fixed-output, 5V/2.1MHz variant (MAX20079AATP/VY+). The 3.3V/2.1MHz and 400kHz variants (MAX20079BATP/ VY+, MAX20079DATP/VY+, and MAX20079EATP/VY+) can be installed with minimal component changes. For the 3.3V/2.1MHz variant, install the MAX20079AATP/VY+ on the EV kit (U1), while keeping all other components the same. For 400kHz parts, a 10μH inductor and an effective output capacitance of 44μF is recommended after derating is accounted for. Setting the Output Voltage in Buck Converters To externally adjust the output voltage, remove R6 and install a 0Ω resistor on R3. Place appropriate resistors in positions R4 and R5 according to the following equation:  V   = R4 R5  OUT1  − 1  VFB   where VFB = 1V (typ) and R5 = 50kΩ. Ordering Information PART MAX20079EVKIT# TYPE 5V output, 2.1MHz EV kit #Denotes RoHS Compliant www.maximintegrated.com Maxim Integrated │  2 Evaluates: MAX20079 MAX20079 Evaluation Kit MAX20079 EV Kit Bill of Materials PART QTY C4, C9 2 C3 1 C10, C11, C12, C13 4 C8 1 C6 1 C5, C7 2 C1, C2 2 L2 1 L1 1 R2, R6 2 R1 1 U1 1 J1 1 EN, SPS, FSYNC 3 SUP_FILTER, SUP, VOUT, GND, GND2, GND3 PGOOD, BIAS, FBR - www.maximintegrated.com DESCRIPTION 4.7uF ±10%, 50V X7R ceramic capacitors (1206) TDK CGA5L3X7R1H475K160AE 47uF, 50V aluminum electrolytic capacitor (8.3mm x 8.3mm) Panasonic EEE-FK1H470P 10uF ±10%, 25V X7R ceramic capacitor (1206) TDK CGA5L1X7R1E106M160AC 1uF ±10%, 35V X7R ceramic capacitor (0603) TDK CGA3E1X7R1V105K080AC 0.1uF ±10% 50V X7R ceramic capacitor (0402) TDK CGA2B3X7R1H104K 0.1uF ±10% 50V X7R ceramic capacitor (0603) TDK CGA3E2X7R1H104M080AE 1uF ±10% 50V X7R ceramic capacitor (0805) TDK CGA4J3X7R1H105M125AB 2.2uH Power Inductor Coilcraft XAL6030-222 2A Ferrite Bead (1210) Taiyo Yuden FBMH3225HM102NT 0Ω resistor (0402) Panasonic Electronic Components P0.0JCT-ND 10kΩ ±5% resistor (0603) Panasonic Electronic Components ERA-2AED103X Automotive Mini-Buck (20-pin SW-TQFN) Maxim MAX20079AATP/VY+ 2-pin headers (0.1" spacing) Sullins PEC02SAAN 3-pin headers (0.1" spacing) Sullins PEC03SAAN 6 5020, Keystone 3 4 1 5012, Keystone Shunt Jumper (0.1" spacing, Black) PCB: MAX20079 EVALUATION KIT Maxim Integrated │  3 GND3 GND2 GND C1 1 L1 C2 2 47UF C3 2 3 4.7UF SUP 1 C4 0.1UF C5 SUP 0.1UF C6 2 3 NC 4 5 2 3 4 5 PGND 1 1 U1 MAX20079 1 L2 PGND 11 11 C7 R2 2 C9 10UF C10 4.7UF FB AGND SUP 1UF C8 BIAS FSYNC 0.1UF 12 12 13 14 OUT 14 13 15 15 7 2 3 EN BST PGOOD 7 SUP_FILTER LX R1 8 BIAS 1 J1 8 SPS 6 6 NC 9 ENABLE 20 20 SPS 19 NC 19 10 9 LX + 1 2 18 18 BIAS 1 2 17 17 PGOOD SYNC 16 NC 16 21 EP 21 10 BIAS 1 2 3 0 www.maximintegrated.com OUT 10UF C11 R6 10UF 0 C12 10UF C13 BIAS R5 R4 R3 FB FBR VOUT MAX20079 Evaluation Kit Evaluates: MAX20079 MAX20079 EV Kit Schematic Maxim Integrated │  4 SUP MAX20079 Evaluation Kit Evaluates: MAX20079 MAX20079 EV Kit PCB Layout Diagrams MAX20079 EVKIT Component Placement Guide Top Silk www.maximintegrated.com Maxim Integrated │  5 MAX20079 Evaluation Kit Evaluates: MAX20079 MAX20079 EV Kit PCB Layout Diagrams (continued) MAX20079 EVKIT Component Placement Guide Top Layer www.maximintegrated.com Maxim Integrated │  6 MAX20079 Evaluation Kit Evaluates: MAX20079 MAX20079 EV Kit PCB Layout Diagrams (continued) MAX20079 EVKIT Layout Internal 2 www.maximintegrated.com Maxim Integrated │  7 MAX20079 Evaluation Kit Evaluates: MAX20079 MAX20079 EV Kit PCB Layout Diagrams (continued) MAX20079 EVKIT PCB Layout Internal 3 www.maximintegrated.com Maxim Integrated │  8 MAX20079 Evaluation Kit Evaluates: MAX20079 MAX20079 EV Kit PCB Layout Diagrams (continued) MAX20079 EVKIT Component Placement Guide Bottom www.maximintegrated.com Maxim Integrated │  9 Evaluates: MAX20079 MAX20079 Evaluation Kit Revision History REVISION NUMBER REVISION DATE 0 10/18 DESCRIPTION Initial release PAGES CHANGED — For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html. 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. © 2018 Maxim Integrated Products, Inc. │  10