MAX1896EVKIT Datasheet MAX1896EVKIT | P1-P3

General Description

The MAX1896 evaluation kit (EV kit) is a fully assembled

and tested surface-mount circuit board that contains a

fixed-frequency 1.4MHz, pulse-width-modulated

(PWM), step-up DC-DC converter. The EV kit provides

a 12.0V output voltage from a 2.5V to 5.5V input source.

It delivers up to 100mA output current.

The EV kit provides low quiescent current and high effi-

ciency. It can also be used to evaluate other output

voltages from VIN voltage up to 13.0V by changing the

feedback resistors, R1 and R2.

Features

♦ 2.5V to 5.5V Input Voltage Range

♦ Output Voltage

Fixed 12.0V

Adjustable Output (From VIN to 13.0V)

♦ Up to 100mA Output Current

♦ 1.4MHz Fixed-Frequency PWM Operation

♦ 0.01µA IC Shutdown Current

♦ Surface-Mount Components

♦ Fully Assembled and Tested

Evaluates: MAX1896

MAX1896 Evaluation Kit

________________________________________________________________ Maxim Integrated Products 1

19-2271; Rev 0; 1/02

Component List

Ordering Information

DESIGNATION QTY DESCRIPTION

C1 1

10µF, 10.0V tantal um cap aci tor ( A)

AVX TAJA106K010

C2 1

4.7µF, 16.0V, X5R ceramic

capacitor (1206)

Taiyo Yuden EMK316BJ475ML

C3 1

0.1µF, 16.0V, X7R ceramic

capacitor (0603)

Taiyo Yuden EMK107BJ104KA

C4 1

100pF, 50.0V ceramic capacitor

(0603)

Taiyo Yuden UMK107CH101JZ or

Murata GRM39C0G101J050AD

C5 1

0.033µF, 16.0V, X7R ceramic

capacitor (0603)

Taiyo Yuden EMK107BJ333KA or

equivalent

DESIGNATION QTY DESCRIPTION

L1 1

10µH inductor

Sumida CR43-100MC

D1 1

1A, 30.0V Schottky diode

Toshiba CRS02 or

Nihon EP10QY03

JU1 1 3-pin header

R1 1 107kΩ ±1% resistor (0603)

R2 1 12.4kΩ ±1% resistor (0603)

R3 1 10kΩ ±5% resistor (0603)

U1 1

MAX1896EUT (SOT23-6) top mark

AAUX

None 1 Shunt

None 1 MAX1896 PC board

None 1 MAX1896 EV kit data sheet

None 1 MAX1896 data sheet

PART TEMP RANGE IC PACKAGE

MAX1896EVKIT 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.

Evaluates: MAX1896

MAX1896 Evaluation Kit

2 _______________________________________________________________________________________

Quick Start

The MAX1896 EV kit is fully assembled and tested.

Follow these steps to verify board operation. Do not

turn on the power supply until all connections are

completed:

1) Verify that the shunt is across jumper JU1 (SHDN)

pins 1 and 2.

2) Connect a voltmeter and load (if any) to the VOUT

pad. Connect the load and voltmeter ground to the

GND pad closest to VOUT.

3) Connect a 2.5V to 5.5V power supply to the VIN

pad. Connect the power-supply ground to the GND

pad closest to VIN.

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

voltage is 12.0V.

To evaluate other output voltages, see the Evaluating

Other Output Voltages section.

Detailed Description

Shutdown Jumper Selection

The MAX1896 EV kit features a shutdown mode that

reduces quiescent current to 0.01µA (typ) to preserve bat-

tery life. JU1 options select the circuit operating modes

(shutdown or normal). Table1 shows JU1 functions.

Soft-Start Control

The MAX1896 EV kit uses a 0.033µF ceramic capacitor

(C5) for soft-start control. The full-load current limit will be

reached after about 8.25ms. To change the soft-start

duration, replace the soft-start capacitor C5, so C5 (µF) =

desired soft-start duration (ms) / 250 (ms/µF). For no soft-

start operation, remove C5 and leave the SS pin open.

Evaluating Other Output Voltages

The EV kit default output voltage is 12.0V. The output

voltage can also be adjusted from VIN to 13.0V by

selecting R1 and R2 values. Choose R2 between 10kΩ

and 50Ω:

R1 = R2 [(V

OUT

/ V

) -1]

where V

= 1.24V.

Table 1. Jumper JU1 Functions

SHUNT LOCATION SHDN PIN MAX1896 OUTPUT

1 and 2 Connected to VIN MAX1896 enabled, VOUT = 12.0V

2 and 3 Connected to GND

Shutdown mode, VOUT = VIN - Forward Diode

Voltage Drop

None

Connected to SHDN pad

(driven by external source)

MAX1896 output depends

on external SHDN signal

Component Suppliers

SUPPLIER PHONE FAX

WEBSITE

AVX 843-946-0238 843-626-3123 www.avxcorp.com

Murata 770-436-1300 770-436-3030 www.murata.com

Nihon 81-33343-3411 81-33342-5407 www.niec.co.jp

Sumida 847-545-6700 847-545-6720 www.sumida.com

Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com

Toshiba 949-455-2000 949-859-3963

www.toshiba.com

Note: Please indicate that you are using the MAX1896 when contacting these component suppliers.

Evaluates: MAX1896

MAX1896 Evaluation Kit

_______________________________________________________________________________________ 3

MAX1896

10µF

10.0V

107kΩ

0.033µF

0.1µF

100pF

4.7µF

16.0V

12.4kΩ

10µH

10kΩ

2.5V TO 5.5V

VIN

12.0V

VOUT

GND

SHDN

GND

SHDN

JU1

Figure 1. MAX1896 EV Kit Schematic

P1-P3 P4-P4

MAX1896EVKIT

Mfr. #:

Buy MAX1896EVKIT

Manufacturer:

Maxim Integrated

Description:

EVAL KIT MAX1896

Lifecycle:

New from this manufacturer.

Delivery:

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MAX1896EVKIT