MAX8728EVKIT Maxim Integrated Products, MAX8728EVKIT Datasheet

MAX8728EVKIT

Manufacturer Part Number

MAX8728EVKIT

Description

Display Modules & Development Tools MAX8728 KIT MAX8728 KIT

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8728EVKIT.pdf (9 pages)

Specifications of MAX8728EVKIT

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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The MAX8728 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 display (LCD) panels in

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

down switching regulator, 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 is a logic-con-

trolled, high-voltage switch with adjustable delay, and

a capacitive dummy load at the gate-on supply for ease

of testing.

The EV kit, as configured, provides the following out-

puts from a +10VDC to +13.2VDC power supply. The

step-down switching regulator is configured for a +3.3V

output, providing at least 2A. The step-up switching

regulator is configured for a +13.5V output, providing at

least 500mA. The positive charge pump is configured

for a +28V output, providing at least 50mA. The nega-

tive charge pump is configured for a -6V output, provid-

ing at least 150mA. The high-voltage switch can be

controlled by external logic and can be configured for a

delay set by an external capacitor.

The MAX8728 switches at 1.5MHz, allowing the use of

tiny surface-mount components. The EV kit can also

operate at a lower frequency with component changes.

The MAX8728 TQFN package (0.8mm maximum

height) with low-profile external components allows this

circuit to be less than 2mm high.

19-3833; Rev 0; 9/05

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, C13

C3–C7

________________________________________________________________ Maxim Integrated Products

QTY

General Description

1µF ±10%, 10V X5R ceramic

capacitor (0603)

TDK C1608X5R1A105K

0.22µF ±20%, 16V X7R ceramic

capacitors (0603)

TDK C1608X7R1C224M

10µF ±20%, 16V X5R ceramic

capacitors (1206)

TDK C3216X5R1C106M

0.01µF ±10%, 50V X7R ceramic

capacitor (0603)

TDK C1608X7R1H103K

22µF ±20%, 6.3V X7R ceramic

capacitor (1206)

TDK C3216X7R0J226M

DESCRIPTION

MAX8728 Evaluation Kit

♦ Configured for +10V to +13.2V Input Range

♦ Output Voltages

♦ Resistor-Adjustable Switching Regulator and

♦ Logic-Controlled, High-Voltage Switch with

♦ Selectable 500kHz/1MHz/1.5MHz Switching

♦ 180° Out-of-Phase Switching

♦ Low-Profile, Surface-Mount Components

♦ Fully Assembled and Tested

*This limited temperature range is for the EV kit PC board only.

The MAX8728 IC temperature range is -40°C to +85°C.

**EP = Exposed paddle.

MAX8728EVKIT

DESIGNATION

C10, C11, C14,

Charge-Pump Output Voltages

Adjustable Delay

Frequency

C19–C22

+3.3V Output at 2A (Step-Down Switching

Regulator)

+13.5V Output at 500mA (Step-Up Switching

Regulator)

+28V Output at 50mA (Positive Charge Pump)

-6V Output at 150mA (Negative Charge Pump)

PART

C12

C15

C16

QTY

Ordering Information

TEMP RANGE

0°C to +70°C*

0.1µF ±10%, 50V X7R ceramic

capacitors (0603)

TDK C1608X7R1H104K

47pF ±5%, 50V C0G ceramic

capacitor (0603)

TDK C1608C0G1H470J

10µF ±20%, 6.3V X5R ceramic

capacitor (0805)

TDK C2012X5R0J106M

100pF ±5%, 50V C0G ceramic

capacitor (0603)

TDK C1608C0G1H101J

Component List

DESCRIPTION

Features

IC PACKAGE

32 TQFN-EP**

Related parts for MAX8728EVKIT

MAX8728EVKIT Summary of contents

Page 1

... Out-of-Phase Switching ♦ Low-Profile, Surface-Mount Components ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX8728EVKIT 0°C to +70°C* *This limited temperature range is for the EV kit PC board only. The MAX8728 IC temperature range is -40°C to +85°C. **EP = Exposed paddle. Component List ...

Page 2

MAX8728 Evaluation Kit DESIGNATION QTY DESCRIPTION 220pF ±10%, 50V X7R ceramic capacitor (0603) C17 1 TDK C1608X7R1H221K 1µF ±10%, 50V X7R ceramic C18 1 capacitor (1206) TDK C3216X7R1H105K 1500pF ±10%, 50V X7R ceramic C23 1 capacitor (0603) TDK C1608X7R1H152K 1000pF ...

Page 3

Recommended Equipment • +10V to +13.2V power supply • One voltmeter The MAX8728 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 ...

Page 4

MAX8728 Evaluation Kit (through resistor R13, jumper JU4, and diode D3) or toward PGND (through resistor R13 and jumper JU4). However, GON stops discharging when the voltage at GON drops to 10 times the threshold voltage set at the THR ...

Page 5

Dummy Load for the High-Voltage Switch The MAX8728 EV kit features a capacitive dummy load of 1500pF (C23) at the VGON output pad to simulate a panel load to test the switch matrix. Jumper JU3 selects and deselects the dummy ...

Page 6

MAX8728 Evaluation Kit Step-Up Switching-Regulator Output The MAX8728 EV kit’s step-up switching-regulator out- put (AVDD) is set to +13.5V by feedback resistors R7 and R8. To generate output voltages other than +13.5V (from V to 28V), select different external voltage- ...

Page 7

Figure 1. MAX8728 EV Kit Schematic _______________________________________________________________________________________ MAX8728 Evaluation Kit 7 ...

Page 8

MAX8728 Evaluation Kit Figure 2. MAX8728 EV Kit Component Placement Guide— Component Side Figure 4. MAX8728 EV Kit PC Board Layout—PGND Layer 2 8 _______________________________________________________________________________________ Figure 3. MAX8728 EV Kit PC Board Layout—Component Side ...

Page 9

... 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 _____________________ 9 © 2005 Maxim Integrated Products ...

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