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General Description

The MAX5026 evaluation kit (EV kit) provides a +30V

output voltage from a +3V to +11V input source. It

delivers up to 6mA output current, depending on the

input voltage. The MAX5026 is a constant-frequency,

pulse-width-modulating (PWM), current-mode step-up

voltage converter with an internal power switch that

operates at 500kHz. This EV kit demonstrates the low-

noise performance of the device.

The MAX5026 EV kit is a fully assembled and tested

surface-mount circuit board. With modifications, this EV

kit can also be used to evaluate MAX5025/MAX5027/

MAX5028. The EV kit can be used to evaluate other out-

put voltages by changing the feedback resistors.

Features

♦ +3V to +11V Input Voltage Range

(MAX5026/MAX5028)

♦ +4.5V to +11V Input Voltage Range

(MAX5025/MAX5027)

♦ Output Voltage:

Adjustable Output Voltage Up to +36V

(MAX5025/MAX5026)

+30V Fixed Output Voltage (MAX5027/MAX5028)

♦ Low Switching Noise

♦ 500kHz Switching Frequency

♦ Less than 1mVp-p High-Frequency Output

Switching Ripple at 2mA Load

♦ Up to 6mA Output Current with +5V Input

♦ 6-Pin SOT23 Package

♦ Surface-Mount Construction

♦ Fully Assembled and Tested

Evaluates: MAX5025–MAX5028

MAX5026 Evaluation Kit

________________________________________________________________ Maxim Integrated Products 1

19-2253; Rev 1; 9/03

Component List

Ordering Information

DESIGNATION

QTY

DESCRIPTION

C1 1

4.7µF, 16V, X5R, 20% ceramic

capacitor (1206)

Taiyo Yuden EMK316BJ475ML

C2, C3 2

1µF, 50V, X7R, 10% ceramic

capacitors (1210)

TDK C3216X7R1H105K (populates

with 1206 case capacitor)

C4, C5 0 Not installed, capacitor (1210)

47µH ±20% power inductor

Toko A915BY-470M

Sumida CDRH4D28-470

D1 1

0.5A, 40V S chottky d i od e ( S OT23)

Zetex ZHCS500

R1 1 147kΩ ±1% resistor (0603)

R2 1 6.34kΩ ±1% resistor (0603)

R3 1 100Ω ±5% resistor (0805)

U1 1 MAX5026EUT (6-Pin SOT23)

JU1

1 3-pin header (JU1)

J1 1 5mm oscilloscope jack

None 1 Shunt

None 1 MAX5026 PC board

Note: To evaluate the MAX5025/MAX5027/MAX5028, request a

MAX5025EUT/MAX5027EUT/MAX5028EUT free sample with the

MAX5026EVKIT.

PART TEMP RANGE IC PACKAGE

MAX5026EVKIT 0

C to +70

C 6 SOT23-6

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.

Summary of content (4 pages)

PAGE 1
9-2253; Rev 1; 9/03 MAX5026 Evaluation Kit Features ♦ +3V to +11V Input Voltage Range (MAX5026/MAX5028) ♦ +4.5V to +11V Input Voltage Range (MAX5025/MAX5027) ♦ Output Voltage: Adjustable Output Voltage Up to +36V (MAX5025/MAX5026) +30V Fixed Output Voltage (MAX5027/MAX5028) ♦ Low Switching Noise ♦ 500kHz Switching Frequency ♦ Less than 1mVp-p High-Frequency Output Switching Ripple at 2mA Load ♦ Up to 6mA Output Current with +5V Input Component List DESIGNATION QTY DESCRIPTION 1 4.
PAGE 2
Evaluates: MAX5025–MAX5028 MAX5026 Evaluation Kit Component Suppliers SUPPLIER PHONE FAX WEBSITE Murata 770-436-1300 770-436-3030 www.murata.com Sumida 847-545-6700 847-545-6720 www.sumida.com Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com TDK 847-803-6100 847-390-4405 www.tdk.com Toko 847-297-0070 847-699-1194 www.tokoam.com Zetex 631-543-7100 631-864-7630 www.zetex.com Note: Please indicate that you are using the MAX5025–MAX5028 when contacting these component suppliers.
PAGE 3
MAX5026 Evaluation Kit Evaluates: MAX5025–MAX5028 Table 1. Jumper JU1 Functions SHDN PIN SHUNT LOCATION MAX5026 OUTPUT 1 and 2 Connected to VIN MAX5026 enabled, VOUT = +30V 2 and 3 Connected to GND Shutdown mode, VOUT = VIN - VD, where VD is the diode forward-voltage drop Connected to SHDN pad External logic signal enables or disables the MAX5026 output Open L1 47µH J1 D1 VIN 5 LX VCC C1 4.
PAGE 4
Evaluates: MAX5025–MAX5028 MAX5026 Evaluation Kit Figure 3. MAX5026 EV Kit Component Placement Guide—Top Silkscreen Figure 4. MAX5026 EV Kit PC Board Layout—Component Side Figure 5. MAX5026 EV Kit PC Board Layout—Solder Side 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.