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General Description

The MAX8654 evaluation kit (EV kit) is a fully assembled

and tested PCB that demonstrates the capabilities of

the MAX8654 integrated 8A step-down regulator. The

EV kit generates a 3.3V output voltage at load currents

up to 8A from a 4.5V to 14V input voltage range. The

MAX8654 switches at 500kHz and provides over 93.4%

efficiency with the supplied components.

Features

o Internal 26mΩ R

DS(ON)

MOSFETs

o Guaranteed 8A Output Current

o Adjustable Over-Current Protection, 6A to 12A

o ±1% Output Accuracy Over Load, Line, and

Temperature

o Operates from 4.5V to 14V Supply

o Adjustable Output from 0.6V to 0.85 x V

o Soft-Start Reduces Inrush Supply Current

o 250kHz to 1.2MHz Adjustable Switching or SYNC

Input

o Compatible with Ceramic, Polymer, and

Electrolytic Output Capacitors

o SYNCOUT Synchronizes 2nd Regulator 180°

Out-of-Phase

o 36-Pin 6mm x 6mm TQFN Package

Evaluates: MAX8654/MAX8688

MAX8654 Evaluation Kit

________________________________________________________________

Maxim Integrated Products

19-0643; Rev 1; 10/08

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

Component Suppliers

PART TEMP RANGE IC PACKAGE

MAX8654EVKIT+ 0°C to +70°C

36 TQFN

(6mm x 6mm)

SUPPLIER PHONE WEBSITE

M ur ata E l ectr oni cs

N orth Am er ica, Inc.

770-436- 1300 w ww .m ur ata- nor tham er ica.com

Taiyo Yuden 800-348- 2496 www.t-yuden.com

TDK Corp. 847-803- 6000 www.component.tdk.com

TOKO America, Inc. 847-297- 0070 www.tokoam.com

DESIGNATION QTY DESCRIPTION

C1A, C1B, C1C 3

10µF ±20%, 16V X5R ceramic

capacitors (1206)

Taiyo Yuden EMK316BJ106M

C2 1

1µF ±10%, 6.3V X5R ceramic

capacitor (0402)

Murata GRM155R60J105K

C3, C11 2

0.01µF ±10%, 50V X7R ceramic

capacitors (0402)

Murata GRM155R71H103K

C4 1

0.22µF ±20%, 16V X7R ceramic

capacitor (0603)

TDK C1608X7R1C224M

C5A, C5B, C5C 3

22µF ±20%, 6.3V X5R ceramic

capacitors (1206)

TDK C3216X5R0J226M

C6 1

6800pF ±10%, 50V X7R ceramic

capacitor (0402)

Murata GRM155R71H682KA88

C7 1

0.022µF, 10V X7R ceramic

capacitor (0402)

Murata GRM155R71C223CKA0I

Component Lists

DESIGNATION QTY DESCRIPTION

C8 1

1000pF, 50V C0G ceramic

capacitor (0402)

Murata GRM1555C1H1D2TADI

C9 1

4.7µF ±10%, 16V X5R ceramic

capacitor (0603)

Murata GRM21BR61C475K

C10 1

0.22µF,16V Y5R ceramic capacitor

(0402)

Taiyo Yuden EMK105BJ224MV-F

C12 1

470pF ±10%, 50V X7R ceramic

capacitor (0402)

Murata GRM155R71H471K

C13 1

0.1µF ±10%, 10V X7R ceramic

capacitor (0402)

Murata GRM155R61A104K

C14, C15 2

0.22µF ±20%, 50V X5R ceramic

capacitors (0805)

Taiyo Yuden UMK212BJ224M

C16 0

Not installed, 0.01µF ±10%, 25V X7R

ceramic capacitor (0402)

Murata GRM155R71E103K

Denotes a lead-free and RoHS-compliant EV kit.

Note: Indicate that you are using the MAX8654 when contact-

ing these component suppliers.

MAX8654 Circuit

Summary of content (13 pages)

PAGE 1
9-0643; Rev 1; 10/08 MAX8654 Evaluation Kit Features The MAX8654 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the capabilities of the MAX8654 integrated 8A step-down regulator. The EV kit generates a 3.3V output voltage at load currents up to 8A from a 4.5V to 14V input voltage range. The MAX8654 switches at 500kHz and provides over 93.4% efficiency with the supplied components.
PAGE 2
Evaluates: MAX8654/MAX8688 MAX8654 Evaluation Kit Component Lists (continued) MAX8688 Circuit—Not Installed DESIGNATION MAX8654 Circuit DESIGNATION QTY DESCRIPTION JP1–JP7, JP9–JP13 0 Not installed JU1, JU2, JU4 3 2-pin headers JU3 1 3-pin header 1 1µH, 7.9mΩ, 12A inductor (7.4mm x 6.7mm x 3mm) TOKO FDV0630-1R0M L1 R1, R2, R10 3 100kΩ ±1% resistors (0402), lead free R3 1 1.
PAGE 3
MAX8654 Evaluation Kit Evaluating Other Switching Frequencies (FREQ) The switching frequency in fixed-frequency PWM operation is resistor-programmable from 250kHz to 1.2MHz. Set the switching frequency of the IC with a resistor (RFREQ) from FREQ to GND. RFREQ is calculated as: ⎛1 ⎞ RFREQ = 52.36 × ⎜ − 0.05μs ⎟ kΩ ⎝ fs ⎠ Soft-Start and REFIN The MAX8654 utilizes an adjustable soft-start function to limit inrush current during startup.
PAGE 4
VIN VIN VDL VIN JP3 JP2 JP1 2 1 2 1 2 1 JP13 JP12 C1C 10μF 1 C1B 10μF C1A 10μF 1 C9 4.7μF C16 DNI R9 1kΩ 1 PGND 31 30 29 28 LX 27 FB R8 2.2Ω C5A 22μF C5B 22μF VOUT C5C 22μF EN C14 0.22μF 2 1 JU4 2 REFIN AGND C10 0.22μF R12 10Ω JP5 JP4 2 1 2 C15 0.22μF 9 8 7 6 5 4 3 2 C2 1μF C11 0.01μF VL VP IN IN IN IN VDL PGND PGND 10 VL EP JU3 R7 75kΩ 1% 11 ILIM PGND Figure 1a.
PAGE 5
JP204 JP203 JP202 JP201 3 2 1 3 2 1 3 2 1 4 3 2 1 TP6 V33 SCL SDA SCL EN RST SDA 5 6 4 2 1 FLT- R215 10kΩ C202 100nF CLKIN V33 OTP V33 C201 100nF 3 TP4 TP2 R204 OPEN SDA RST CLKIN DVDD DGND OTP1 22 19 7 8 9 10 11 12 R19 100kΩ V33 EP A2 A1 DACOUT AGND AVDD REFOUT RS- RSC 20 TP3 C203 100nF R217 100Ω SCL NC8 NC9 ENOUT FLT A3 MAX8688 RS+ 21 U201 ISNC ISN+ ISN- 24 23 ISN- ISN+ 25 13 14 15 16 17 18 A3 V33 R201 OPEN C204 1μF R
PAGE 6
Evaluates: MAX8654/MAX8688 MAX8654 Evaluation Kit Figure 2.
PAGE 7
MAX8654 Evaluation Kit Evaluates: MAX8654/MAX8688 Figure 3.
PAGE 8
Evaluates: MAX8654/MAX8688 MAX8654 Evaluation Kit Figure 4.
PAGE 9
MAX8654 Evaluation Kit Evaluates: MAX8654/MAX8688 Figure 5.
PAGE 10
Evaluates: MAX8654/MAX8688 MAX8654 Evaluation Kit Figure 6.
PAGE 11
MAX8654 Evaluation Kit Evaluates: MAX8654/MAX8688 Figure 7.
PAGE 12
Evaluates: MAX8654/MAX8688 MAX8654 Evaluation Kit Figure 8.
PAGE 13
MAX8654 Evaluation Kit REVISION NUMBER REVISION DATE DESCRIPTION 0 5/07 Initial release 1 10/08 Change in compensation components (C6, C7, C8, R5, and R6) PAGES CHANGED — 1, 2, 4 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.