MAX8739EVKIT Maxim Integrated Products, MAX8739EVKIT Datasheet

MAX8739EVKIT

Manufacturer Part Number

MAX8739EVKIT

Description

Display Modules & Development Tools MAX8739 KIT MAX8739 KIT

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8739EVKIT.pdf (6 pages)

Specifications of MAX8739EVKIT

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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The MAX8739 evaluation kit (EV kit) is a fully assembled

and tested surface-mount circuit board that provides

the voltages and features required for active-matrix,

thin-film transistor (TFT), liquid-crystal displays (LCDs).

The EV kit contains a step-up switching regulator, a

positive two-stage charge-pump for the TFT gate-on

supply, and a negative single-stage charge pump for

the TFT gate-off supply. Also included are two opera-

tional amplifiers that can be used to drive the LCD

backplane (VCOM) or the gamma-correction divider

string, and a logic-controlled, high-voltage switch with

adjustable delay.

The EV kit operates from a DC supply voltage of +1.8V

to +5.5V. The step-up switching regulator is configured

for a +8V output providing at least 250mA from a 2.2V

input. The positive charge pump is configured for a

+22V output providing at least 20mA. The negative

charge pump is configured for a -7V output providing at

least 20mA. The two operational amplifiers are both

configured for +4V, each capable of providing up to

±150mA peak. The high-voltage switch can be used to

delay the output of the positive charge pump’s startup.

The delay time is set with an external capacitor, C6.

The MAX8739 EV kit demonstrates low quiescent cur-

rent and high efficiency (85%) for maximum battery life.

Operation at 1.2MHz allows the use of tiny surface-

mount components. The MAX8739 TQFN package

(0.8mm maximum height) with low-profile external com-

ponents allows this circuit to be less than 1.25mm high.

19-0508; Rev 0; 3/06

Component List continued on next page.

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.

DESIGNATION

C2, C7, C8, C9

C4, C5

QTY

________________________________________________________________ Maxim Integrated Products

General Description

0.22µF ±10%, 16V X7R ceramic

capacitor (0603)

TDK C1608X7R1C224K

Taiyo Yuden EMK107BJ224KA

Not installed, capacitors (0603)

10µF ±20%, 6.3V X5R ceramic

capacitor (1206)

TDK C3216X5R0J106M-0.95

4.7µF ±20%, 10V X5R ceramic

capacitors (1206)

TDK C3216X5R1A475M-0.9

Component List

DESCRIPTION

MAX8739 Evaluation Kit

♦ +1.8V to +5.5V Input Range

♦ Output Voltages

♦ Resistor-Adjustable Switching Regulator and Op-

♦ Logic-Controlled, High-Voltage Switch with

♦ Greater than 85% Efficiency (Step-Up Switching

♦ 1.2MHz Step-Up Switching Frequency

♦ Selectable 600kHz Step-Up Switching Frequency

♦ Low-Profile Surface-Mount Components (1.25mm

♦ Fully Assembled and Tested

The MAX8739 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 there is a shunt installed across jumper

2) Connect the positive terminal of the power supply

MAX8739EVKIT

Amp Output Voltages

Adjustable Delay

Regulator)

(Component Changes Required)

max)

1.8V to 5.5V, 2A DC power supply

Voltmeters

JU2.

to the VIN pad. Connect the negative terminal of

the power supply to the GND pad.

+8V Output at 250mA (2.2V Input Step-Up

Switching Regulator)

+22V Output at 20mA (Positive Charge Pump)

-7V Output at 20mA (Negative Charge Pump)

+4V Output at ±150mA (Operational Amplifiers

VOUT1 and VOUT2)

PART

0°C to +70°C

RANGE

Recommended Equipment

Ordering Information

TEMP

IC PACKAGE

20 TQFN

(5mm x 5mm x 0.8mm)

Quick Start

Features

Procedure

Related parts for MAX8739EVKIT

MAX8739EVKIT Summary of contents

Page 1

... Low-Profile Surface-Mount Components (1.25mm max) ♦ Fully Assembled and Tested Ordering Information TEMP PART RANGE MAX8739EVKIT 0°C to +70°C The MAX8739 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. Recommended Equipment • ...

Page 2

MAX8739 Evaluation Kit DESIGNATION QTY DESCRIPTION 220pF ±10%, 50V X7R ceramic capacitor (0603 TDK C1608X7R1H221K or equivalent 0.033µF ±10%, 25V X7R ceramic capacitor (0603) C10 1 TDK C1608X7R1E333K or equivalent 0.1µF ±10%, 50V X7R ceramic C11–C16, C18, capacitors ...

Page 3

Detailed Description The MAX8739 EV kit contains a step-up switching regu- lator, a positive two-stage charge pump, a negative sin- gle-stage charge pump, two operational amplifiers, and a high-voltage switch matrix. The EV kit operates from a DC power supply ...

Page 4

MAX8739 Evaluation Kit GOFF -7V GND C12 0.1µF VIN VIN +1.8V TO +5.5V C17 C3 R7 100µF 10µF 100kΩ GND 16V 6.3V JU1 C7 R9 OPEN 100kΩ C6 220pF GON CTL GND Figure 1. MAX8739 EV Kit Schematic 4 _______________________________________________________________________________________ ...

Page 5

Figure 2. MAX8739 EV Kit Component Placement Guide— Component Side Figure 4. MAX8739 EV Kit PC Board Layout—GND Layer 2 _______________________________________________________________________________________ MAX8739 Evaluation Kit Figure 3. MAX8739 EV Kit PC Board Layout—Component Side 5 ...

Page 6

... Maxim reserves the right to change the circuitry and specifications without notice at any time. implied. Maxim reserves the right to change the circuitry and specifications without notice at any time _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products © ...

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