Evaluates: MAX17543 in

3.3V Output-Voltage Application

MAX17543 3.3V Output Evaluation Kit

General Description

The MAX17543 3.3V output evaluation kit (EV kit) provides

a proven design to evaluate the MAX17543 high-voltage,

high-efficiency, synchronous step-down DC-DC convert-

er. The EV kit is preset for 3.3V output at load currents

up to 2.5A and features a 450kHz switching frequency for

optimum efficiency and component size. The EV kit

features adjustable input undervoltage lockout, adjust-

able soft-start, open-drain RESET signal, and external

frequency synchronization.

Features

● Operatesfroma5Vto42VInputSupply

● 3.3VOutputVoltage

● Upto2.5AOutputCurrent

● 450kHzSwitchingFrequency

● Enable/UVLOInput,Resistor-ProgrammableUVLO

Threshold

● AdjustableSoft-StartTime

● MODEPintoSelectAmongPWM,PFM,orDCM

Modes

● Open-DrainRESETOutput

● ExternalFrequencySynchronization

● OvercurrentandOvertemperatureProtection

● ProvenPCBLayout

● FullyAssembledandTested

19-7347; Rev 0; 9/14

Ordering Information appears at end of data sheet.

*EP = Exposed pad.

Note: C7, R1, and R2 are optional components; R1 and R2 are

not needed if the EN/UVLO pin is permanently connected to

VIN. The electrolytic capacitor (C7) is required only when the

VIN power supply is situated far from the MAX17543-based

circuit. When R5 is open, the device switches at 500kHz switch-

ing frequency.

DESIGNATION QTY

DESCRIPTION

C1

1

2.2µF±10%,50VX7Rceramic

capacitor (1210)

TDKC3225X7R1H225K

C2

1

2.2µF±10%,10VX7Rceramic

capacitor (0603)

MurataGRM188R71A225K

C3

1

5600pF±10%,25VX7Rceramic

capacitor (0402)

MurataGRM155R71E562K

C4

1

47µF±10%,10VX7Rceramic

capacitor (1210)

MurataGRM32ER71A476K

C5

1

0.1µF±10%,16VX7Rceramic

capacitor (0402)

MurataGRM155R71C104K

C6

0

Not installed, ceramic capacitor

(0402)

C7

1

47µF,50Valuminumelectrolytic

capacitor (D = 10mm)

PanasonicEEEFK1H470XP

JU1–JU3

3

3-pin headers

DESIGNATION QTY

DESCRIPTION

L1

1

6.8µH,5Ainductor

CoilcraftMSS1048-682NL

TaiyoYudenNS10165T6R8NNA

R1

1

3.32MΩ±1%resistor(0402)

R2

1

1MΩ±1%resistor(0402)

R3

1

127kΩ±1%resistor(0402)

R4

1

47.5kΩ±1%resistor(0402)

R5

0

45.3kΩ±1%resistor(0402)

R6

1

10kΩ±1%resistor(0402)

TP1,TP2

2

Test pads

U1

1

Buckconverter(20TQFN-EP*)

MaximMAX17543ATP+

—

3

Shunts(JU1,JU2,JU3)

—

1

PCB:MAX17543–3.3VOUTPUT

EVKIT

Component List