MAX1818EVKIT Datasheet MAX1818EVKIT | P1-P3

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General Description

The MAX1818 linear regulator evaluation kit (EV kit) pro-

vides a regulated +1.8V output voltage from a +2.5V to

+5.5V input source. It delivers up to 500mA output current.

The EV kit is a fully assembled and tested surface-

mount PC board. It can also evaluate other preset volt-

ages and other output voltages in the +1.25V to +5.0V

range by using external resistors.

Features

♦ +2.5V to +5.5V Input Voltage Range

♦ Up to 500mA Output Current

♦ Output Voltage

+1.8V Fixed Output Voltage (MAX1818EUT18)

+1.25 to +5.0V Adjustable Output Voltage

(External Divider)

♦ Power-OK Output

♦ 6-Pin SOT23 Package

♦ Surface-Mount Construction

♦ Fully Assembled and Tested

Evaluates: MAX1818EUT15/18/20/25/33/50

MAX1818 Evaluation Kit

________________________________________________________________ Maxim Integrated Products 1

19-2052; Rev 0; 5/01

Component List

Ordering Information

Quick Start

The MAX1818 EV Kit is fully assembled and tested.

Follow these steps to verify board operation.

Do not turn on the power supply until all connec-

tions are completed.

1) Verify that the shunt is across pins 1 and 2 of

jumper JU1 (SHDN) (Table 1).

2) Connect a voltmeter to the VOUT pad. Connect the

ground to the GND pad closest to VOUT.

3) Connect a +2.5V to +5.5V supply to the VIN pad.

Connect the supply ground to the GND pad closest

to VIN.

4) Turn on the power supply, and verify that the output

is the preset voltage: +1.8V.

To evaluate other voltages, refer to Evaluating Other

Output Voltages.

Note: Please indicate that you are using the MAX1818 when

contacting these component suppliers.

SUPPLIER PHONE FAX

Taiyo Yuden 408-573-4150 408-573-4159

TDK 847-390-4373 847-390-4428

Component Suppliers

DESIGNATION QTY DESCRIPTION

C1 1

1µF ±10%, 10V X7R ceramic

capacitor (0805)

Taiyo Yuden LMK212BJ105KG

C2 1

4.7µF ±20%, 6.3V X5R ceramic

capacitor (0805)

Taiyo Yuden JMK212BJ475MG or

TDK C2012X5R0J475M

R1 0 Not installed (0603)

R2 0

Not installed, pads shorted with PC

trace (0603)

R3 1 100kΩ ±5% resistor (0603)

U1 1 MAX1818EUT18 (6-pin SOT23)

JU1 1 3-pin header

None 1 Shunt

None 1 MAX1818 PC board

None 1 MAX1818 EV kit data sheet

None 1 MAX1818 data sheet

Note: To evaluate the MAX1818EUT15, /20, /25, /33, or /50,

request a MAX1818EUT15, /20, /25, /33, or /50 free sample with

the MAX1818 EV kit. Refer to soldering information in Absolute

Maximum Rating section of MAX1818 data sheet for mass

production solder reflow advice.

PART TEMP. RANGE IC-PACKAGE

MAX1818EVKIT 0°C to +70°C 6 SOT23

Evaluates: MAX1818EUT15/18/20/25/33/50

MAX1818 Evaluation Kit

2 _______________________________________________________________________________________

MAX1818EUT18

1.0µF

10V

VIN

+2.5V TO +5.5V

POK

GND

4.7µF

6.3V

100kΩ

OPEN

SHORT

VOUT

+1.8V

GND

JU1

SHDN

POK

OUT

SET

GND

SHDN

Figure 1. MAX1818 EV Kit Schematic

SHUNT

LOCATION

SHDN

MAX1818 OUTPUT

1 and 2 Connected to VIN

MAX1818 enabled,

OUT

= +1.8V

2 and 3 Connected to GND

Shutdown mode,

OUT

= 0V

None

Connected external

source to SHDN

pad

MAX1818 output

depends on external

SHDN signal

Table 1. Jumper JU1 Functions

MAX1818 PART

AND SUFFIX

MAX1818 EV KIT FIXED

OUTPUT VOLTAGE

MAX1818EUT15 +1.5V

MAX1818EUT18 +1.8V

MAX1818EUT20 +2.0V

MAX1818EUT25 +2.5V

MAX1818EUT33 +3.3V

MAX1818EUT50 +5.0V

Table 2. MAX1818 EV Kit Corresponding

Output Voltage

Detailed Description

The MAX1818 EV kit contains a low-dropout, linear reg-

ulator circuit, which provides a +1.8V output from a

+2.5V to +5.5V input voltage. The EV kit provides up to

500mA output current. Power-OK will provide a logical

low output when the output voltage falls below 93% of

its nominal voltage.

The MAX1818 EV kit features a shutdown mode that

reduces quiescent current to 0.1µA (typ) to preserve

the battery life.

Evaluating Other Output Voltages

The output voltage of the MAX1818 EV kit is preset to

+1.8V. To generate an output voltage other than the

preset output voltage, cut open the PC trace shorting

R2, and install feedback resistors R1 and R2. Select R2

in the 25kΩ to 100kΩ range.

OUT

= V

SET

(1 + R1 / R2)

R1 = R2 [(V

OUT

/ V

SET

) - 1]

where V

SET

= 1.25V.

The MAX1818 EV kit can also be used to evaluate the

MAX1818EUT15, /20, /25, /33, or /50. Replace

MAX1818EUT18 with a MAX1818EUT15, /20, /25, /33,

or /50. Hand soldering for single unit evaluation on the

EV kit is acceptable. Table 2 lists the corresponding

output voltage.

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.

3 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

Figure 2. MAX1818 EV Kit Component Placement Guide—

Component Side

Figure 3. MAX1818 EV Kit PC Board Layout—Component Side

Figure 4. MAX1818 EV Kit PC Board Layout—Solder Side

Figure 5. MAX1818 EV Kit Component Placement Guide—

Solder Side

1.0" 1.0"

MAX1818 Evaluation Kit

Evaluates: MAX1818EUT15/18/20/25/33/50

P1-P3

MAX1818EVKIT

Mfr. #:

Buy MAX1818EVKIT

Manufacturer:

Maxim Integrated

Description:

Power Management IC Development Tools Evaluation Kit for the MAX1818EUT15, MAX1818EUT18, MAX1818EUT20, MAX1818EUT25, MAX1818EUT33, MAX1818EUT

Lifecycle:

New from this manufacturer.

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MAX1818EVKIT