ANALOG DEVICES MAX20806 EV Kit Evaluation Board User Guide

: August 10, 2024
: Analog Devices

Table of Contents

ANALOG DEVICES MAX20806 EV Kit Evaluation Board
Product Usage Instructions
General Description
Benefits and Features
Operation
MAX20806 EV Kit Bill of Materials
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

ANALOG DEVICES MAX20806 EV Kit Evaluation Board

Specifications

Product Name: MAX20806 EV Kit
Evaluated Component: MAX20806
Package Size: 14-pin, 3.0mm x 2.5mm FC2QFN
Load Current: Up to 6A

Product Usage Instructions

Operation
The output voltage (VOUT) is calculated using the formula: VOUT = VREF x (1

RFB1/RFB2), where VREF is the fixed reference voltage of 0.5V, RFB1 is the top divider resistor, and RFB2 is the bottom divider resistor.

Soft-Start
Soft-start initiates when VIN and EN reach their rising thresholds. The soft-start ramp time is 3ms. The device also supports smooth startup with output prebiased.

Efficiency Testing
Use the J4 pin header test point to measure VIN and the J6 pin header test point to measure VOUT during efficiency measurement. Do not use these test points for loading purposes.

Bode Plot
A 10Ω resistor is placed between the VOUT sense point and SNSP pin for measuring the Bode plot. Test points TP13 and TP14 are provided on the board for small signal injection and Bode plot measurement for VOUT. FAQ

Q: What is the purpose of the MAX20806 EV Kit?
- A: The MAX20806 EV Kit is a reference platform designed for evaluating the MAX20806, a compact, low-cost, highly efficient DC-DC switching regulator IC.
Q: How do I start using the EV kit?
- A: To verify board operation, follow these steps:
- Position the SW1 toggle switch to disable the IC.
- Connect a powered-off 2.7V to 16V input supply to J5.
Q: How can I measure efficiency with this kit?
- A: Use the provided test points J4 and J6 to measure VIN and VOUT respectively during efficiency testing.

Evaluation Board User Guide

MAX20806 EV Kit

Evaluates: MAX20806

General Description

The MAX20806 evaluation kit (EV kit) is a reference platform designed for the evaluation of the MAX20806, a compact, low-cost, fully integrated, highly efficient, step-down DC-DC switching
regulator IC. The IC is in a 14-pin, 3.0mm x 2.5mm FC2QFN package. This EV kit can deliver up to 6A load current. For more information, refer to the MAX20806 IC data sheet.
The EV kit comprises a fully assembled and tested PCB implementation of the MAX20806. The jumper pins, test points, and input/output connectors are included to provide a flexible and convenient use in a wide range of applications.

Benefits and Features

2.7V to 16V Input Voltage Range
0.5V to 5.8V Output Voltage Range
500kHz to 3.0MHz Switching Frequency Range
High Efficiency and Power Density
Low Component Count
Optimized Performance
Proven PCB Layout
Fully Assembled and Tested

Quick Start
Required Equipment

MAX20806 EV kit
2.7V to 16V power supply
0 to 6A load
Digital voltmeters
Oscilloscope and probes

Procedure
The EV kit is fully assembled and tested. Use the following steps to verify board operation.

Position the SW1 toggle switch to disable the IC.
Connect a powered-off 2.7V to 16V input supply to J5 (positive terminal) and J8 (negative terminal) to the bias input VIN (VDDH pin). Verify that the input polarity is correct before proceeding to the next step.
Connect the electronic load to the outputs of the PCB to the screw terminals ST1 (VOUT) and ST2 (GND) or to the edge connector. Verify that the output polarity is correct before proceeding to the next step.
Connect the oscilloscope or multimeter probes to TP2 (VOUT) and TP11 (GND) to measure the output voltage at the loading point.
Turn on the 2.7V to 16V input power supply.
Position the SW1 toggle switch towards the “EN” silkscreen to enable the IC.
Enable the electronic load to the desired level, if applicable.
Observe that VOUT = 1V (EV kit’s default configuration).

Notes

For accurate efficiency measurements, use pin header J4 for VIN measurement and J6 for VOUT measurement.
For accurate VOUT regulation measurement across full load range, use J7 or J9 for VOUT sensing measurement.
For low-noise VOUT ripple measurement, probe across capacitor C47.

MAX20806 EV Kit Photo

Operation

The MAX20806 IC is a monolithic, high-frequency, step-down switching regulator optimized for applications that require a small size, low noise, and high efficiency. For detailed product and application information, refer to the MAX20806 IC data sheet.

Output Enable (OE)
The OE is used to enable/disable the IC by toggling SW1. When OE is enabled, the IC starts switching and the output voltage is regulated. Likewise, when OE is disabled, the IC stops switching and the output discharges.

Output-Voltage Selection
The MAX20806 EV kit is set up to initially boot up to an output voltage of 1V. The device has a fixed 0.5V reference voltage, and the output voltage is configured by placing a voltage divider in the feedback path.

VOUT = VREF x (1 + RFB1/RFB2)
where
VOUT = Output voltage
VREF = 0.5V fixed reference voltage
RFB1 = Top divider resistor
RFB2 = Bottom divider resistor

Soft-Start
When VIN and EN are above their rising thresholds, soft-start begins, and switching is enabled. The soft-start ramp time is 3ms. The device also supports smooth startup with output prebiased.

Switching Frequency
The switching frequency is programmable—parameters and PGM0 are used to select the switching frequency. For the MAX20806 EV kit, the switching frequency is set to 1000kHz. For more information, refer to the PGM0 Switching Frequency, AMS, and DCM Selections table (Table 1) in the MAX20806 IC data sheet.

Pin-Strap Programmability
The MAX20806 EV kit provides an option to configure the part for the desired application using PGMx resistor values. For more information, refer to PGM0 Switching Frequency, AMS, and DCM Selections table (Table 1) and the PGM1 Configurations for OUTPUT table (Table 2) in the MAX20806 IC data sheet. Appropriate values of the resistors R1 and R2 can be used for the desired application and protection.

Status Monitoring
Whenever the part is actively regulating and the output voltage is within the power-good window, the PGOOD pin is high. In all other conditions, including enabled but in a fault state, the PGOOD pin is pulled low. For more information, refer to the MAX20806 IC data sheet.

Input-Voltage Monitoring
The input supply can be monitored on TP4 for VIN and TP7 for GND.

Switching-Voltage Monitoring
The switching LX waveform can be monitored on TP3.

Output-Voltage Monitoring
Several VOUT test points on the EV kit can be used for different testing setups. The output voltage-sense point can be monitored on pin header J7 or SMB connector J9. The output voltage at the load terminals can be monitored on TP2 (output terminal) and TP11 (ground terminal).

Note: These test points should not be used for loading.

Efficiency Testing
The J4 pin header test point is provided to measure VIN, and the J6 pin header test point is provided to measure VOUT during efficiency measurement.

Bode Plot
A 10Ω resistor is installed between the VOUT sense point and SNSP pin to measure the Bode plot. The TP13 and TP14 test points are provided on the board on either side of the 10Ω resistor for small signal injection and the ability to measure Bode plot for VOUT.

Ordering Information

PART	TYPE
MAX20806EVKIT#	EV Kit

Denotes RoHS compliant.

MAX20806 EV Kit Bill of Materials

ITEM| REF_DES| DNI/ DNP| QTY| MFG PART #| MANUFACTURER| VALUE| DESCRIPTION
---|---|---|---|---|---|---|---
1| C1| —| 1| C0402X5R100-224KNP;

GRM155R61A224KE19; 0402ZD224KAT2A

| MURATA; VENKEL; AVX| 0.22UF| CAP; SMT (0402);

0.22UF; 10%; 10V; X5R; CERAMIC

2| C2| —| 1| C1608X5R1E475K080AC; GRM188R61E475KE11| TDK; MURATA| 4.7UF| CAP; SMT (0603);

4.7UF; 10%; 25V; X5R; CERAMIC

3| C3, C5| —| 2| TPSD107K020R0085| AVX| 100UF| CAP; SMT (7343);

100UF; 10%; 20V; TANTALUM

4| C6, C47| —| 2| GRM155R71E104KE14; C1005X7R1E104K050BB; TMK105B7104KVH;

CGJ2B3X7R1E104K050BB

| MURATA; TDK; TAIYO YUDEN; TDK| 0.1UF| CAP; SMT (0402);

0.1UF; 10%; 25V; X7R; CERAMIC

5| C7, C16| —| 2| GRM155R71E104ME14| MURATA| 0.1UF| CAP; SMT (0402);

0.1UF; 20%; 25V; X7R; CERAMIC

6| C8, C9| —| 2| GRM21BC71E106KE11| MURATA| 10UF| CAP; SMT (0805);

10UF; 10%; 25V; X7S; CERAMIC

7| C26| —| 1| C0402C102K5GAC| KEMET| 1000PF| CAP; SMT (0402);

1000PF; 10%; 50V; C0G; CERAMIC

8| C32, C36, C37, C39, C42, C46,

C48, C50

| —| 8| GRM188C80J226ME15| MURATA| 22UF| CAP; SMT (0603);

22UF; 20%; 6.3V; X6S; CERAMIC

9| C45| —| 1| C0402C101J5GAC; NMC0402NPO101J; CC0402JRNPO9BN101; GRM1555C1H101JA01;

C1005C0G1H101J050BA

| KEMET; NIC COMPONENTS CORP.; YAGEO PHICOMP;

MURATA; TDK

| 100PF| ****

CAP; SMT (0402);

100PF; 5%; 50V; C0G; CERAMIC

10| D1, D3| —| 2| MBRS540T3G| ON SEMICONDUCTOR| MBRS540T3| DIODE; SCH; SURFACE MOUNT SCHOTTKY POWER RECTIFIER; SMC;

PIV=40V; IF=5A

11| DS1| —| 1| LGL29K-G2J1-24-Z| OSRAM| LGL29K- G2J1-24-Z| DIODE; LED; SMARTLED; GREEN; SMT; PIV=1.7V;

IF=0.02A

12| J1| —| 1| PCC03SAAN| SULLINS| PCC03SAAN| CONNECTOR; MALE; THROUGH HOLE; BREAKAWAY; STRAIGHT THROUGH; 3PINS; – 65 DEGC TO +125

DEGC

13| J2| —| 1| UPS-08-01-01-L-RA| SAMTEC| UPS-08-01- 01-L-RA| CONNECTOR; FEMALE; THROUGH HOLE; DUAL LEAF

POWER HEADER;

ITEM| REF_DES| DNI/ DNP| QTY| MFG PART #| MANUFACTURER| VALUE| DESCRIPTION
---|---|---|---|---|---|---|---
| | | | | | | RIGHT ANGLE; 8PINS

14

| ****

J4, J6, J7

DEGC

15| J5, J8| —| 2| 6095| KEYSTONE| 6095| CONNECTOR; FEMALE; PANELMOUNT; NON- INSULATED RECESSED HEAD BANANA JACK; STRAIGHT

THROUGH; 1PIN

16| J9| —| 1| 131-3701-266| JOHNSON COMPONENTS| 131-3701-266| CONNECTOR; MALE; THROUGH HOLE; SMB JACK VERTICAL PCB MOUNT; STRAIGHT;

5PINS

17

| ****

L1

| ****

—

| ****

1

| ****

PA5003.471NLT

| ****

PULSE

| ****

0.47UH

| INDUCTOR; SMT; COMPOSITE;

0.47UH; 20%; 18.4A

18| MH1-MH4| —| 4| 9032| KEYSTONE| 9032| MACHINE FABRICATED; ROUND-THRU HOLE SPACER; NO THREAD; M3.5;

5/8IN; NYLON

19| Q1| —| 1| BSS138| ON SEMICONDUCTOR| BSS138| TRAN; LOGIC LEVEL ENHANCEMENT MODE FIELD EFFECT TRANSISTOR; NCH; SOT-23; PD-(0.36W); I-(0.22A); V-(50V); -55

DEGC TO +150

DEGC

20| R1| —| 1| CR0402-16W-9090FT| VENKEL LTD.| 909| RES; SMT (0402);

909; 1%; +/-

100PPM/DEGC;

0.0630W

21| R2| —| 1| ERJ-2RKF8061| PANASONIC| 8.06K| RES; SMT (0402);

8.06K; 1%; +/-

100PPM/DEGC;

0.1000W

22| R3, R15| —| 2| RC0402JR-070RL; CR0402-16W-000RJT| YAGEO

PHYCOMP; VENKEL LTD.

| 0| RES; SMT (0402); 0;

5%; JUMPER;

0.0630W

23| R9, R12| —| 2| CRCW04023K01FK| VISHAY DALE| 3.01K| RES; SMT (0402);

3.01K; 1%; +/-

ITEM| REF_DES| DNI/ DNP| QTY| MFG PART #| MANUFACTURER| VALUE| DESCRIPTION
---|---|---|---|---|---|---|---
| | | | | | | 100PPM/DEGC;

0.0630W

24| R14| —| 1| 9C04021A10R0FL| YAGEO| 10| RES; SMT (0402); 10;

1%; +/-

100PPM/DEGC;

0.0630W

25| R26| —| 1| CRCW040249R9FKEDHP| VISHAY DRALORIC| 49.9| RES; SMT (0402);

49.9; 1%; +/-

100PPM/DEGC;

0.2000W

26| R39| —| 1| ERJ-2RKF1002| PANASONIC| 10K| RES; SMT (0402);

10K; 1%; +/-

100PPM/DEGC;

0.1000W

27| R41| —| 1| CRCW040220K0FK| VISHAY DALE| 20K| RES; SMT (0402);

20K; 1%; +/-

100PPM/DEGC;

0.0630W

28| R42| —| 1| RC0603FR-07100RL; CR0603-FX-1000ELF| YAGEO; BOURNS| 100| RES; SMT (0603);

100; 1%; +/-

100PPM/DEGC;

0.1000W

29| R51| —| 1| ERJ-3EKF2100| PANASONIC| 210| RES; SMT (0603);

210; 1%; +/-

100PPM/DEGK;

0.1000W

30| ST1, ST2| —| 2| 7808| KEYSTONE| 7808| TERMINAL; BODY LENGTH=0.67IN; BODY WIDTH=0.47IN; HEIGHT=0.45IN;

SCRW; BRASS

31| SW1| —| 1| GT21MCBE| C&K COMPONENTS| ****

GT21MCBE

| SWITCH; DPDT; THROUGH HOLE; 20V; 0.4VA; GT SERIES; SEALED ULTRAMINIATURE TOGGLE SWITCH; RCOIL= 0.05 OHM; RINSULATION=10G OHM; C&K

COMPONENTS

32| TP1, TP7, TP11, TP32| —| 4| 5011| KEYSTONE| N/A| TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD HOLE=0.063IN; BLACK; PHOSPHOR BRONZE WIRE SILVER PLATE

FINISH;

33| TP2, TP4, TP10| —| 3| 5010| KEYSTONE| N/A| TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN;

BOARD

ITEM| REF_DES| DNI/ DNP| QTY| MFG PART #| MANUFACTURER| VALUE| DESCRIPTION
---|---|---|---|---|---|---|---
| | | | | | | HOLE=0.063IN; RED; PHOSPHOR

BRONZE WIRE SIL;

34| TP3| —| 1| USE FOR COLD TEST: 5015| KEYSTONE| N/A| TEST POINT; SMT; PIN LENGTH=0.135IN; PIN WIDTH=0.07IN; PIN HEIGHT=0.06IN; SILVER; PHOSPHOR BRONZE WITH SILVER PLATE

CONTACT

35| TP13, TP14| —| 2| 5012| KEYSTONE| N/A| TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD HOLE=0.063IN; WHITE; PHOSPHOR BRONZE WIRE SILVER PLATE

FINISH;

36| TP29, TP30| —| 2| 5126| KEYSTONE| N/A| TEST POINT; PIN DIA=0.125IN; TOTAL LENGTH=0.445IN; BOARD HOLE=0.063IN; GREEN; PHOSPHOR BRONZE WIRE SILVER PLATE

FINISH;

37| U1| —| 1| MAX20806| ANALOG DEVICES| MAX20806| EVKIT PART – IC; 6A; 3MHZ; 2.7V TO 16V; STEP-DOWN SWITCHING REGULATOR;

FC2QFN14

38| PCB| —| 1| MAX20806| ANALOG DEVICES| PCB| PCB:MAX20806
39| C19, C23| DNP| 2| C0402C103J3RAC| KEMET| 0.01UF| CAP; SMT (0402);

0.01UF; 5%; 25V; X7R; CERAMIC

40| C33, C38| DNP| 2| GRM31CD80J107ME39| MURATA| 100UF| CAP; SMT (1206);

100UF; 20%; 6.3V; X6T; CERAMIC

41| C40| DNP| 1| T491X477K010AT| KEMET| 470UF| CAP; SMT (7343);

470UF; 10%; 10V; TANTALUM

42| C41, C43, C44, C49| DNP| 4| C0805C476M9PAC; GRM21BR60J476ME15| KEMET; MURATA| 47UF| CAP; SMT (0805);

47UF; 20%; 6.3V; X5R; CERAMIC

43| R4| DNP| 1| ERJ-P08J101| PANASONIC| 100| RES; SMT (1206);

100; 5%; +/-

200PPM/DEGC;

0.6600W

ITEM| REF_DES| DNI/ DNP| QTY| MFG PART #| MANUFACTURER| VALUE| DESCRIPTION
---|---|---|---|---|---|---|---
44| R5, R6, R8| DNP| 3| RC0402JR-070RL; CR0402-16W-000RJT| YAGEO PHYCOMP;

VENKEL LTD.

| 0| RES; SMT (0402); 0;

5%; JUMPER;

0.0630W

45| R7| DNP| 1| CR0402-16W-3013FT; CRCW0402301KFK| VENKEL LTD.; VISHAY DALE| 301K| RES; SMT (0402);

301K; 1%; +/-

100PPM/DEGC;

0.0630W

46| R10| DNP| 1| CRCW0402100KFK; RC0402FR-07100KL| VISHAY; YAGEO| 100K| RES; SMT (0402);

100K; 1%; +/-

100PPM/DEGC;

0.0630W

47| R27, R29| DNP| 2| CRCW04020000Z0EDHP; RCS04020000Z0| VISHAY DRALORIC; VISHAY DALE| 0| RES; SMT (0402); 0; JUMPER; JUMPER; 0.2000W

MAX20806 EV Kit Schematic

MAX20806 EV Kit PCB Layout

Revision History

REVISION NUMBER| REVISION DATE| DESCRIPTION| PAGES CHANGED
---|---|---|---
0| 7/24| Initial Release| –

Notes
ALL INFORMATION CONTAINED HEREIN IS PROVIDED “AS IS” WITHOUT REPRESENTATION OR WARRANTY. NO RESPONSIBILITY IS ASSUMED BY ANALOG DEVICES FOR ITS USE, NOR FOR ANY INFRINGEMENTS OF PATENTS OR OTHER RIGHTS OF THIRD PARTIES THAT MAY RESULT FROM ITS USE. SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE. NO LICENSE, EITHER EXPRESSED OR IMPLIED, IS GRANTED UNDER ANY ADI PATENT RIGHT, COPYRIGHT, MASK WORK RIGHT, OR ANY OTHER ADI INTELLECTUAL PROPERTY RIGHT RELATING TO ANY COMBINATION, MACHINE, OR PROCESS, IN WHICH ADI PRODUCTS OR SERVICES ARE USED. TRADEMARKS AND REGISTERED TRADEMARKS ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS.

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