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Evaluates: MAX20002/MAX20003

MAX20003 Evaluation Kit

Detailed Description of Hardware

The MAX20003 EV kit demonstrates the MAX20003 high-

voltage, 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)

Placeashuntinthe1-2positiononjumperJU1fornormal

operation. To place the device into shutdown mode, move

theshuntonJU1tothe2-3position.

Synchronization Input (FSYNC)

The EV kit features jumper JU2 to control the synchro-

nization input (FSYNC). The device synchronizes to an

external signal applied to FSYNC. Connect FSYNC to

AGNDtoenableskip-modeoperation.ConnecttoBIAS

ortoanexternalclocktoenablefixed-frequencyforced-

PWM mode operation.

Touseanexternalclock,uninstalltheshuntonJU2and

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

externalclockusedhasaminimum100nspulsewidth.

Spread-Spectrum Option (SPS)

The EV kit provides jumper JU3 that allows SPS to be

pulled high (VL) or pulled low (PGND). ConnectSPS

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)

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.

Power-Good Output (PGOOD)

The EV kit provides a PGOOD test point to monitor the

statusofthedeviceoutput.PGOODassertswhenVOUT

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)orafixed+3.3Voutputvoltage.Tosettheoutput

toothervoltagesbetween1Vand10V,connectaresistive

dividerfromoutput(OUT)toFBtoAGND.Usethefollow-

ing formula to determine the R7 and R8 of the resistive

divider network:

OUT

R7 R8





×−









where VFB=1V.

Operation at 400kHz Switching Frequency

For 400kHz switching frequency, the following compo-

nents need to be changed to:

● R4=73.2kΩ

● L1=6.8µH(recommendCoilcraftXAL5050-682MEB)

● R1=16.5kΩ

● C10=4,700pF

● C11=6.8pF

Additional capacitance on C7 and C8 may be needed,

depending on transient performance.

MAX20002 Datasheet(PDF) 2 Page - Maxim Integrated Products

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