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Evaluates: MAX17505 in

3.3V Output-Voltage Application

MAX17505 3.3V Output Evaluation Kit

General Description

The MAX17505 3.3V output evaluation kit (EV kit) provides

a proven design to evaluate the MAX17505 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 1.7A 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

● Operates from a 4.5V to 60V Input Supply

● 3.3V Output Voltage

● Up to 1.7A Output Current

● 450kHz Switching Frequency

● Enable/UVLO Input, Resistor-Programmable UVLO

Threshold

● Adjustable Soft-Start Time

● MODE Pin to Select Among PWM, PFM, or DCM

Modes

● Open-Drain RESET Output

● External Frequency Synchronization

● Overcurrent and Overtemperature Protection

● Proven PCB Layout

● Fully Assembled and Tested

19-6890; Rev 0; 12/13

Ordering Information appears at end of data sheet.

Component List

*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 MAX17505-based

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

switching frequency. The XAL6060 inductor has been used to

prepare the EV kit test report.

DESIGNATION QTY DESCRIPTION

C1 1

2.2µF ±10%, 100V X7R ceramic

capacitor (1210)

Murata GRM32ER72A225KA35

C2 1

2.2µF ±10%, 10V X7R ceramic

capacitor (0603)

Murata GRM188R71A225K

C3 1

5600pF ±10%, 25V X7R ceramic

capacitor (0402)

Murata GRM155R71E562K

C4 1

47µF ±10%, 10V X7R ceramic

capacitor (1210)

Murata GRM32ER71A476K

C5 1

0.1µF ±10%, 16V X7R ceramic

capacitor (0402)

Murata GRM155R71C104K

C6 0

Not installed, ceramic capacitor

(0402)

C7 1

47µF, 80V aluminum electrolytic

capacitor (D = 10mm)

Panasonic EEEFK1K470P

JU1–JU3 3 3-pin headers

DESIGNATION QTY DESCRIPTION

L1 1

6.8μH inductor

Coilcraft XAL6060-682ME

Sumida 0420CDMCDS-6R8MC

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

Buck converter (20 TQFN-EP*)

Maxim MAX17505ATP+

— 3 Shunts (JU1–JU3)

— 1

PCB: MAX17505 - 3.3V OUTPUT

EVKIT

Summary of content (11 pages)

PAGE 1
MAX17505 3.3V Output Evaluation Kit General Description The MAX17505 3.3V output evaluation kit (EV kit) provides a proven design to evaluate the MAX17505 high-voltage, high-efficiency, synchronous step-down DC-DC converter. The EV kit is preset for 3.3V output at load currents up to 1.7A and features a 450kHz switching frequency for optimum efficiency and component size.
PAGE 2
Evaluates: MAX17505 in 3.3V Output-Voltage Application MAX17505 3.3V Output Evaluation Kit Component Suppliers SUPPLIER PHONE WEBSITE Coilcraft, Inc. 847-639-6400 www.coilcraft.com Murata Americas 800-241-6574 www.murataamericas.com Panasonic Corp. 800-344-2112 www.panasonic.com Sumida Corp. 408-321-9660 www.sumida.com Note: Indicate that you are using the MAX17505 when contacting these component suppliers. Quick Start Recommended Equipment ●● MAX17505 3.3V output EV kit ●● 4.
PAGE 3
Evaluates: MAX17505 in 3.3V Output-Voltage Application MAX17505 3.3V Output Evaluation Kit Regulator Enable/Undervoltage-Lockout Level (EN/UVLO) The device offers an adjustable input undervoltagelockout level. For normal operation, a shunt should be installed across pins 1-2 on jumper JU1. To disable the output, install a shunt across pins 2-3 on JU1 and the EN/ UVLO pin is pulled to GND. See Table 1 for JU1 settings.
PAGE 4
MAX17505 3.3V Output Evaluation Kit Evaluates: MAX17505 in 3.3V Output-Voltage Application EV Kit Test Report 3.3V OUTPUT, PWM MODE LOAD AND LINE REGULATION 3.37 3.35 3.36 3.34 3.35 3.33 3.32 VIN = 48V 3.31 3.30 3.29 3.28 VIN = 12V 3.27 3.26 0 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 3.36 3.31 VIN = 24V 3.30 VIN = 36V MODE = OPEN 0 500 1000 LOAD CURRENT (mA) 1500 1700 3.3V OUTPUT, PFM MODE EFFICIENCY vs.
PAGE 5
Evaluates: MAX17505 in 3.3V Output-Voltage Application MAX17505 3.3V Output Evaluation Kit EV Kit Test Report (continued) 60 90 50 80 40 VIN = 24V 70 60 VIN = 36V VIN = 12V 50 VIN = 48V 40 -20 10 -30 10 100 LOAD CURRENT (mA) -40 1000 1700 Figure 5. MAX17505 3.3V Output Efficiency (DCM Mode) 20 GAIN 0 20 1 60 40 10 -10 MODE = VCC 80 PHASE 20 30 0 120 100 30 GAIN (dB) EFFIEIENCY (%) 100 3.3V OUTPUT, 1.
PAGE 6
Evaluates: MAX17505 in 3.3V Output-Voltage Application MAX17505 3.3V Output Evaluation Kit EV Kit Test Report (continued) 3.3V OUTPUT, PFM MODE (LOAD CURRENT STEPPED FROM 5mA TO 0.85A) VOUT (AC) 3.3V OUTPUT, DCM MODE (LOAD CURRENT STEPPED FROM 50mA TO 0.85A) 100mV/div IOUT MODE = OPEN VOUT (AC) 100mV/div 500mA/div IOUT 500mA /div MODE = VCC 2ms/div 200µs/div Figure 8. MAX17505 3.3V Output, 5mA to 0.85A Load Transient (PFM Mode) Figure 9. MAX17505 3.3V Output, 50mA to 0.
PAGE 7
MAX17505 3.3V Output Evaluation Kit Evaluates: MAX17505 in 3.3V Output-Voltage Application Figure 11. MAX17505 3.3V Output EV Kit Schematic www.maximintegrated.
PAGE 8
MAX17505 3.3V Output Evaluation Kit 1 1 2 1 Evaluates: MAX17505 in 3.3V Output-Voltage Application 2 2 1 2 5 15 6 21 7 2 4 9 1 3 8 2 2 2 1 1 2 14 13 12 2 1 1 2 1 2 1 2 1 11 10 1 1 1 2 2 18 20 1 2 3 2 1 17 2 2 19 2 1 1 16 1 1 1 1 1 1 2 1 2 2 1 1 2 1 2 3 2 1 3 2 1 1 1 1.0’’ 1.0’’ Figure 12. MAX17505 3.3V Output EV Kit Component Placement Guide—Component Side 1 1 2 1 Figure 14. MAX17505 3.
PAGE 9
Evaluates: MAX17505 in 3.3V Output-Voltage Application MAX17505 3.3V Output Evaluation Kit 1 1 1 2 1 2 1 2 1 2 1 2 1 2 1 1 2 1 2 1 2 2 3 21 3 2 1 3 2 1 1 1 1.0’’ Figure 16. MAX17505 3.3V Output EV Kit PCB Layout— Solder Side 1.0’’ Figure 17. MAX17505 3.3V Output EV Kit Component Placement Guide—Top Solder Mask 1.0’’ Figure 18. MAX17505 3.3V Output EV Kit Component Placement Guide—Bottom Solder Mask www.maximintegrated.
PAGE 10
MAX17505 3.3V Output Evaluation Kit Evaluates: MAX17505 in 3.3V Output-Voltage Application Ordering Information PART TYPE MAX17505EVKITA# EV Kit #Denotes RoHS compliant. www.maximintegrated.
PAGE 11
MAX17505 3.3V Output Evaluation Kit Evaluates: MAX17505 in 3.3V Output-Voltage Application Revision History REVISION NUMBER REVISION DATE 0 12/13 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.