MAX8784EVKIT+ Maxim Integrated Products, MAX8784EVKIT+ Datasheet

MAX8784EVKIT+

Manufacturer Part Number

MAX8784EVKIT+

Description

Display Modules & Development Tools MAX8784 KIT MAX8784 KIT

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8784EVKIT.pdf (11 pages)

Specifications of MAX8784EVKIT+

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 11
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The MAX8784 evaluation kit (EV kit) is a fully assembled

and tested surface-mount PCB that provides the volt-

ages and features required for active-matrix, thin-film

transistor (TFT) liquid-crystal display (LCD) panels in

LCD monitors and LCD TVs. The EV kit contains a step-

up switching regulator, a two-stage positive charge

pump for the TFT gate-on supply, a single-stage nega-

tive charge pump for the TFT gate-off supply, and three

high-current op amps. Two capacitor-control delays are

available: one to control the initial startup of the step-

up, and the other to control the delay between the neg-

ative and positive charge pumps. Also included is a

logic-controlled, high-voltage switch for the positive-

gate driver supply. A high-voltage stress (HVS) mode is

provided to increase the step-up and the positive

charge-pump output voltages for stress testing the dis-

play panel during production. A capacitive dummy load

is provided at the high-voltage switch output for ease of

testing without a panel attached.

The EV kit operates from a DC supply voltage of +4.5V

to +5.5V, as configured. The step-up switching regula-

tor is configured for a +14V output providing at least

700mA. The positive charge pump is configured for a

+28V output providing at least 50mA. The negative

charge pump is configured for a -9V output providing at

least 50mA. The three high-current op amps are each

configured for a +7V output that can source or sink

180mA. The high-voltage switch can be controlled by

external logic. The EV kit’s input voltage range can be

lowered to +4V at slightly lower load currents.

The MAX8784 step-up switching regulator operates at

1.2MHz, allowing the use of tiny surface-mount compo-

nents. The MAX8784 thin QFN package (0.8mm max

height), with low-profile external components, allows

this circuit to be less than 3mm high.

19-0787; Rev 0; 3/07

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.

________________________________________________________________ Maxim Integrated Products

General Description

MAX8784 Evaluation Kit

♦ +4.5V to +5.5V Input-Voltage Range

♦ Output Voltages

♦ 1.2MHz Switching Frequency

♦ All Output Voltages are Resistor Adjustable

♦ Logic-Controlled, High-Voltage Switch

♦ High-Voltage Stress Mode for the Step-Up and

♦ Capacitor-Controlled Initial Startup Delay and

♦ Low-Profile Surface-Mount Components

♦ Fully Assembled and Tested

+ Denotes a lead-free and RoHS-compliant EV kit.

* This limited temperature range applies to the EV kit PCB only.

The MAX8784 IC temperature range is -40°C to +85°C.

** EP = Exposed paddle.

MAX8784EVKIT+

DESIGNATION

Positive Charge-Pump Output Voltages

Positive Charge-Pump Delay

+14V Output at 700mA (Step-Up

Switching Regulator)

+28V Output at 50mA (Positive

Charge Pump)

-9V Output at 50mA (Negative

Charge Pump)

Three High-Current Op Amps (±180mA)

C1, C2

C3, C4

PART

QTY

TEMP RANGE

0°C to +70°C*

Ordering Information

10µF ±20%, 6.3V X5R ceramic

capacitors (0603)

TDK C1608X5R0J106M

10µF ±20%, 16V X5R ceramic

capacitors (1206)

TDK C3216X5R1C106M

1µF ±10%, 6.3V X5R ceramic

capacitor (0402)

TDK C1005X5R0J105K

Not installed, capacitor (0402)

330pF ±10%, 50V X7R

ceramic capacitor (0402)

Murata GRM155R71H331K

Component List

DESCRIPTION

40 Thin QFN-EP**

IC PACKAGE

Features

Related parts for MAX8784EVKIT+

MAX8784EVKIT+ Summary of contents

Page 1

... Low-Profile Surface-Mount Components ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX8784EVKIT+ 0°C to +70°C* + Denotes a lead-free and RoHS-compliant EV kit. * This limited temperature range applies to the EV kit PCB only. The MAX8784 IC temperature range is -40°C to +85° Exposed paddle. ...

Page 2

MAX8784 Evaluation Kit DESIGNATION QTY 0.01µF ±10%, 10V X5R C8 1 ceramic capacitor (0402) TDK C1005X5R1A103K 0.1µF ±10%, 25V X5R ceramic C9, C13, 4 capacitors (0402) C14, C15 TDK C1005X5R1E104K 0.22µF ±10%, 6.3V X5R C10 1 ceramic capacitor (0402) TDK ...

Page 3

Recommended Equipment • +4.5V to +5.5V power supply • One voltmeter The MAX8784 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all ...

Page 4

MAX8784 Evaluation Kit The MAX8784 features a HVS mode that can increase the output voltages of the step-up switching regulator and the positive charge pump to stress test the display panel dur- ing production. The step-up switching-regulator’s output is increased ...

Page 5

Dummy Load for the High-Voltage Switch Output (VGON) The MAX8784 EV kit features a capacitive dummy load of 1500pF (C17) at the VGON output pad to simulate a panel load to test the switch matrix. When testing with an LCD ...

Page 6

MAX8784 Evaluation Kit Figure 1. MAX8784 EV Kit Schematic 6 _______________________________________________________________________________________ ...

Page 7

Figure 2. MAX8784 EV Kit Component Placement Guide—Component Side _______________________________________________________________________________________ MAX8784 Evaluation Kit 7 ...

Page 8

MAX8784 Evaluation Kit Figure 3. MAX8784 EV Kit PCB Layout—Component Side 8 _______________________________________________________________________________________ ...

Page 9

Figure 4. MAX8784 EV Kit PCB Layout—GND Layer 2 _______________________________________________________________________________________ MAX8784 Evaluation Kit 9 ...

Page 10

MAX8784 Evaluation Kit Figure 5. MAX8784 EV Kit PCB Layout—Power Layer 3 10 ______________________________________________________________________________________ ...

Page 11

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 © 2007 Maxim Integrated Products MAX8784 Evaluation Kit is a registered trademark of Maxim Integrated Products, Inc ...

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