General Description

The MAX1575 evaluation kit (EV kit) is a fully assem-

bled and tested circuit for evaluating the MAX1575

white LED 1x/1.5x charge pump. The MAX1575 drives

4 white LEDs in a main display group and 2 white LEDs

in a sub-group. These 6 surface-mount white LEDs are

included on the EV kit. In addition to the LED driver cir-

cuit, the EV kit includes two pulse-generator circuits on

the left side of the PC board that are used for testing

the single-wire serial pulse-dimming feature of the

MAX1575.

Features

♦ Powers 4 Main and 2 Sub-Display LEDs

Battery Discharge

♦ 1.5% LED Current Matching

♦ Adaptive 1x/1.5x Mode Switchover

♦ Low Input Ripple and EMI

♦ Individual 5% to 100% Brightness Single-Wire

Serial Pulse Dimming

♦ 2.7V to 5.5V Supply Voltage Range

♦ Thin QFN 4mm x 4mm IC Package

♦ Fully Assembled and Tested

MAX1575 Evaluation Kit

________________________________________________________________ Maxim Integrated Products

1

19-3335; Rev 0; 7/04

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.

Quick Start

Recommended Equipment

A 2.7V to 5.5V power supply or battery capable of

delivering 200mA.

Procedure

Follow the steps below to verify board operation.

1) Verify that shunts are connected across pins 1-2 of

jumpers JU2 and JU3.

2) Preset the power supply to between 2.7V and 5.5V.

3) Turn off the power supply. Do not turn on the power

supply until all connections are completed.

4) Connect the positive power supply terminal to the

pad on the EV kit labeled IN.

5) Connect the power supply ground terminal to the

pad on the EV kit labeled GND.

6) Turn on the power supply and verify that the LEDs

are lit.

See the Detailed Description section for testing the

dimming and shutdown features.

DESIGNATION

QTY

DESCRIPTION

C1–C4

4

1µF

±20%, 6.3V X5R ceramic

capacitors (0402)

Panasonic ECJ0EB0J105M or

TDK C1005X5R0J105M or

equivalent

C5, C8

2

2.2µF

±10%, 6.3V X5R ceramic

capacitors (0603)

Panasonic ECJ1VB0J225K or

TDK C1608X5R0J225K or

equivalent

C6, C7

2

0.01µF

±10%, X7R ceramic

capacitors (0402)

TDK C1005X7R1E103K or

equivalent

D1–D6

6

White surface-mount

right-angle LEDs

Nichia NSCW215T

D7, D8

2

Diodes (SOD-323)

Central CMDD4448

JU1

0

Not installed, PC board short

JU2, JU3

2

3-pin headers

R1

1

6.81k

Ω ±1% resistor (0402)

R2, R3

2

10k

Ω ±5% resistors (0402)

S1, S2

2

Momentary pushbutton switches

Panasonic EVQ-PHP03T

U1

1

Maxim MAX1575ETE

(16 thin QFN 4mm x 4mm)

U2, U3

2

MAX6818EUS-T (4-pin SOT143)

—2

Shunt, 2 position

PART

TEMP RANGE

IC PACKAGE

MAX1575EVKIT

0

°C to +70°C

16 Thin QFN (4mm x 4mm)

Ordering Information

Component List