MAX20735EVKIT#

Evaluates: MAX20735 MAX20735 Evaluation Kit General Description The MAX20735 Evaluation Kit (EV kit) serves as a reference platform for evaluating the MAX20735 voltage regulator IC. This single-chip, integrated switching regulator provides an extremely compact, low-cost, highly efficient, fast, accurate and reliable power delivery solution for emerging low-output voltage applications up to 40A. Refer to the MAX20735 IC data sheet for more information. The EV kit consists of a fully assembled and tested PCB implementation of the MAX20735. Jumper pins, test points, and input/output connectors are included for flexibility and ease-of-use in a wide range of applications. The evaluation board is configured with an “edge strip” to allow high di/dt loading when evaluating the system. The +VOUT connection is on the top side, while the return (or -VOUT) is on the bottom side, directly mirroring the topside strip. Either solder directly to the output “strip” or use the J8 terminal block to interface to a load. Features ●● High Efficiency and Power Density ●● Low Component Count ●● Small Solution Size • 509mm2 Including Inductor and Output Capacitors ●● Optimized Performance ●● Reduced Design-In Time ●● Proven PCB Layout ●● Fully Assembled and Tested Ordering Information appears at end of data sheet. 19-8622; Rev 0; 8/16 Getting Started Required Equipment ●● MAX20735 EV kit ●● 4.5V to 16V power supply ●● 0A to 40A Load ●● Oscillocope, probes, voltmeter Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Connect a powered-off 4.5V to 16V input supply to J1. • Optionally, connect supply sense leads to VDD1 and GND1 for best accuracy. 2) Connect the load to J3 or J8. 3) Connect the VOUT scope probe/voltmeter to J4 or J11, as desired. • J4 and J11 are connected to the sense point for best accuracy. 4) Position the SW1 toggle switch, pointing away from J1 to enable the IC (if desired). 5) Turn on the power supply and observe that VOUT = 1V. 6) For efficiency measurements, J6 has appropriate Kelvin sense points. Evaluates: MAX20735 MAX20735 Evaluation Kit Operation Input-Voltage Monitoring The MAX20735 IC is a monolithic, high-frequency stepdown switching regulator optimized for applications requiring small-size, high-efficiency, and low-output voltages. Detailed product and application information is provided in the MAX20735 IC data sheet. The VDD1 and GND1 sense points monitor the input supply. Output Enable (OE) J4-1 and J4-2 monitor the output voltage of VOUT and GND, respectively. These test points should not be used for loading. Alternatively, scopejack J11 can be used to monitor the output voltage. OE is used to enable/disable the output voltage. The output voltage is enabled/disabled by SW1. Pointing SW1 in the direction of the silkscreened arrow enables the regulator. Output-Voltage Selection The EV kit is setup to initially boot up to an output voltage of 1V. This has been accomplished by setting the reference to come up to a VBOOT of 0.6484V and placing a voltage-divider in the feedback path with a divide ratio of 0.6484. For different VOUT values, the VBOOT and feedback-divider ratio can be changed, as described in the MAX20735 IC data sheet. RGAIN and COUT can also be changed to affect performance. Refer to the MAX20735 IC data sheet for more details. Soft-Start and Switching Frequency These are programmable parameters. For the EV kit, softstart is set to 3ms, and switching frequency to 400kHz. Status Monitoring Whenever the part is actively regulating, and the output voltage is within the power-good window, the STAT pin is high. In all other conditions, including enabled but in a fault state, the STAT pin is pulled low. Refer to the MAX20735 IC data sheet for more details. www.maximintegrated.com Switching-Voltage Monitoring The switching waveform can be monitored on VX1. Output-Voltage Monitoring Efficiency Testing ●● J6 provides convenient access to the appropriate VIN and VOUT sense points. ●● VIN_EFF± are on J6 pins 1 and 2. ●● VOUT_EFF± are on J6 pins 3 and 4. ●● Input and output currents should be measured with 0.1% lab shunts. ●● For increased accuracy, shunt mismatch can be mea­sured and calibrated out by doing a test running the same current through both shunts. ●● For increased accuracy, shunt mismatch can be measured and calibrated out by doing a test running the same current through both shunts. Ordering Information DEVICE TYPE MAX20735EVKIT# #Denotes RoHS compliant. TYPE EV Kit Maxim Integrated │  2 Evaluates: MAX20735 MAX20735 Evaluation Kit MAX20735 Bill of Materials Part Reference Quantity Description C1, C74, C75 3 100uF, 25V, 20%, TANTALUM C24 1 0.01uF, 25V, 10%, X7R C3 1 0.1uF, 25V, 10%, X7R C32 1 1000pF, 50V, 10%, X7R C5, C6, C10, C11 4 47uF, 25V, 20%, X5R C50 1 22uF, 6.3V, 20%, X6S C60, C61 2 1.0uF, 25V, 20%, X5R C62, C63, C66, C67, C69, C70, C71, C76, C77 9 100uf, 6.3V, 20%, X5R C7 1 1uF, 25V, 10%, X7R C8 1 0.22uF, 16V, 10%, X7R C9, C36, C51 3 10uF, 6.3V, 20%, X5R GND1, GND2, GND3, LOOP, VDD1, VX1 6 1_PIN-1X1 Straight J1, J8 2 2_PIN-2 Pin, Terminal Block w/Screws, Blue J11 1 Shielded Scope Probe Jack, Vertical J3 1 2_Pin-Edge Fingers J4 1 VOUT-DIF-1X2 Straight J6 1 8_PIN-2X4 Straight J7 1 6_PIN-2X3 Straight L1 1 170nH, 10%, Isat= 66A R1 1 1.78KΩ, 1%, 1/16W R10, R20, R21, R22, R23 5 1KΩ, 5%, 1/16W R11, R14 2 0Ω, 5%, 1/16W R2 1 162KΩ, 1%, 1/16W R3 1 2.67KΩ, 1%, 1/16W R4 1 10Ω, 1%, 1/16W R5, R8 2 20KΩ, 5%, 1/16W R6 1 1.87KΩ, 1%, 1/16W R9 1 3.48KΩ, 1%, 1/16W SW1 1 DPDT-DPDT, 6pins, 1switch U1 1 MAX20735 1 PCB# 35-900335-01-00 www.maximintegrated.com Maxim Integrated │  3 2,3 2 2 3 3 2 PGM2 STAT OE VCC3 VCC2 VOUT C32 1000pF 0402 OE R15 0402 C51 10uF X5R 0402 Rgain = 1.6m-ohm Valley OCP = 35A Fsw = 400kHz 15 13 PGM3 STAT L2 VCC2 VCC3 OE STAT PGM3 PGM2 VOUT VSENSE- VSENSE+ MAX20735 VX BST U1 Do Not Stuff MTG1 Do Not Stuff MTG2 Combo footprint to fit L1 or L2 VX 12 14 VCC PGM1 C31 Do Not Stuff 0402 PGM2 VCC2 VCC3 9 3 OE 4 PGM2 C36 10uF X5R 0402 PGM1 Tstat = 125us OTP = 150C Freq Band = Even C23 R3 Do Not Stuff 2.67K 0402 0402 PGM3 Do Not Stuff C4 R2 Do Not Stuff 162K 0402 0402 PGM1 PMBus Addr = 0 Tss = 3ms Vboot = 0.65V R1 1.78K 0402 20K R8 0402 2,3 PGM3 STAT 2 PGM1 3.3V 20K R5 0402 VCC 2,3 C9 10uF X5R 0402 2,3 3.3V C7 1uF X7R 0603 VX VSENSE+ VSENSE- 1 2 Do Not Stuff HS1 BST 7 C8 0.22uF X7R 0402 8 C3 0.1uF X7R 0402 Do Not Stuff TIM1 Diff Pair R12 Do Not Stuff 0402 170nH L1 GND2 VX1 R10 1K 0402 C5 47uF X5R 1206 1 2 1 GND_POWER VDDH 5 VDDH 10 VCC AGND 11 GND 6 R9 3.48K 0402 C39 R6 Do Not Stuff 1.87K 0402 0402 0 0402 C11 47uF X5R 1206 C38 Do Not Stuff 0402 R13 Do Not Stuff 0402 SENSE_VOUT C10 47uF X5R 1206 C37 Do Not Stuff 0402 R14 C6 47uF X5R 1206 Diff Pair 0 0402 R11 10 R4 0402 J4 VOUT-DIF C24 0.01uF 0402 C71 100uf 1206 C68 Do Not Stuff 1206 VDD1 C76 100uf 1206 C69 100uf 1206 C66 100uf 1206 C63 100uf 1206 1 SNS C77 100uf 1206 C70 100uf 1206 C67 100uf 1206 VOUT C50 22uF 0805 C41 Do Not Stuff 0805 C30 C49 Do Not Stuff Do Not Stuff 0805 0805 C45 C48 Do Not Stuff Do Not Stuff 0805 0805 + C29 Do Not Stuff C28 Do Not Stuff C43 Do Not Stuff 0805 C42 Do Not Stuff 0805 38-900335-01-00-07 + C20 Do Not Stuff 0805 VOUT Vin Sense- Vin Sense+ C64 Do Not Stuff 1206 GND1 Vin Supply 1 C52 C47 C44 C12 C53 C16 C46 Do Not Stuff Do Not Stuff Do Not Stuff Do Not Stuff Do Not Stuff Do Not Stuff Do Not Stuff 0805 0805 0805 0805 0805 0805 0805 C33 C40 C34 Do Not Stuff Do Not Stuff Do Not Stuff 0805 0805 0805 C27 C19 C15 Do Not Stuff Do Not Stuff Do Not Stuff 0805 0805 0805 C65 Do Not Stuff 1206 J1 C26 C18 C14 Do Not Stuff Do Not Stuff Do Not Stuff 0805 0805 0805 1 2 C62 100uf 1206 + C75 100uF VDDH C22 C17 C13 Do Not Stuff Do Not Stuff Do Not Stuff 0805 0805 0805 + C2 + C72 + C73 + C74 Do Not Stuff Do Not Stuff Do Not Stuff 100uF LOOP + C1 100uF 1 www.maximintegrated.com 1 2 VDDH MAX20735 Evaluation Kit Evaluates: MAX20735 MAX20735 Schematics Maxim Integrated │  4 1,3 1 1,3 1,3 1 1 1,3 1,3 1 PGM1 PGM3 PGM2 STAT OE VCC3 VCC2 VOUT 1,3 3.3V VDDH 1K R21 1K R20 VIN_EFF- C60 1.0uF 0402 25V X5R VIN_EFF+ VIN_EFFVOUT_EFF2 4 6 8 J6 1 3 5 7 1K R23 1K R22 VIN_EFF+ VOUT_EFF+ VOUT Efficiency Test 1 2 + VOUT_EFF- C61 1.0uF 0402 25V X5R 4 2 4 6 BYPASS ON/OFF C56 Do Not Stuff C58 Do Not Stuff X7R 0402 VOUT_EFF+ Do Not Stuff J9 C35 Do Not Stuff X7R 0603 3 OE STAT J7 1 1 3 5 PGM1 PGM3 PGM2 5 C57 Do Not Stuff X5R 0402 12VB LP2992AIM5-3.3/NOPB U3 Vout Vin GND 2 GND3 6 4 3 1 SW3 1 1 5 2 3.3V VDDH 6 4 3 1 5 2 Enable SW1 OE VOUT 3 4 Do Not Stuff SW4 2 J11 3 1 2 J8 R26 2 1 J3 2 1 2_Pin PGM3 Do Not Stuff 38-900335-01-00-07 SCOPE_PROBE_JACK 2 1 Vboot Restore 1 GND_POWER +VOUT www.maximintegrated.com GND VDDH 1,3 MAX20735 Evaluation Kit Evaluates: MAX20735 MAX20735 Schematics (continued) Maxim Integrated │  5 www.maximintegrated.com 1 2 Do Not Stuff C705 Do Not Stuff X700 Do Not Stuff C702 1 2 3 4 5 6 7 8 9 10 11 12 13 14 D700 R709 Do Not Stuff D701 Do Not Stuff C703 Do Not Stuff C706 Do Not Stuff Do Not Stuff MCLR/Vpp/RE3 RB7/KBI3/PGD RA0/AN0 RB6/KBI2/PGC RA1/AN1 RB5/KBI1/PGM RA2/AN2/Vref-/CVref RB4/AN11/KBI0 RA3/AN3/Vref+ RB3/AN9/CCP2(1)/VPO RA4/T0CKI/C1OUT/RCV RB2/AN8/INT2/VMO RA5/AN4/SS/HLVDIN/C2OUTRB1/AN10/INT1/SCK/SCL Vss RB0/AN12/INT0/FLT0/SDI/SDA OSC1/CLKI Vdd OSC2/CLKO/RA6 Vss RC0/T1OSO/T13CKI RC7/RX/DT/SDO RC1/T1OSI/CCP2(1)/UOE RC6/TX/CK RC2/CCP1 RC5/D+/VP Vusb RC4/D-/VM U700 Do Not Stuff Do Not Stuff R705 R700 MCLR R704 C700 Do Not Stuff Do Not Stuff R703 Do Not Stuff 5VUSB 28 27 26 25 24 23 22 21 20 19 18 17 16 15 PGD PGC SWI 2 4 6 8 10 12 14 16 R715 Do Not Stuff R714 Do Not Stuff R713 Do Not Stuff R710 Do Not Stuff R708 Do Not Stuff 1 3 5 7 9 11 13 15 VCC2 VCC3 MAXPOWERTOOL002# Do Not Stuff J704 C707 Do Not Stuff 5VUSB ALERT Do Not Stuff R702 C704 Do Not Stuff C701 Do Not Stuff R701 Do Not Stuff 6 7 8 9 1 2 3 4 5 J702 USB USB 4pin Do Not Stuff CABLE1 Do Not Stuff MTG1 MTG2 MTG3 MTG4 1 2 3 4 5 1 2 3 4 R707 R706 Do Not Stuff Do Not Stuff J701 SWI GND PGC PGD MCLR 5VUSB Serial ALERT 3.3V 1 2 3 4 5 Programming Do Not Stuff J703 GND_POWER VCC3 R719 Do Not Stuff VCC2 R720 Do Not Stuff PGM3 DNS R721 Do Not Stuff PGM2 R722 Do Not Stuff R723 Do Not Stuff 1,2 1 1 1,2 1,2 1,2 38-900335-01-00-07 MAX20735 Evaluation Kit Evaluates: MAX20735 MAX20735 Schematics (continued) Do Not Stuff Data IN Maxim Integrated │  6 MAX20735 Evaluation Kit Evaluates: MAX20735 MAX20735 PCB Layer Top Silkscreen Bottom Silkscreen www.maximintegrated.com Maxim Integrated │  7 MAX20735 Evaluation Kit Evaluates: MAX20735 MAX20735 PCB Layer (continued) Layer 1 Layer 2 www.maximintegrated.com Maxim Integrated │  8 MAX20735 Evaluation Kit Evaluates: MAX20735 MAX20735 PCB Layer (continued) Layer 3 Layer 4 www.maximintegrated.com Maxim Integrated │  9 Evaluates: MAX20735 MAX20735 Evaluation Kit Revision History REVISION NUMBER REVISION DATE 0 8/16 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. © 2016 Maxim Integrated Products, Inc. │  10