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General Description

The MAX17094 evaluation kit (EV kit) is a fully assem-

bled and tested surface-mount PCB that provides the

voltages and features required for active-matrix, thin-

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

EV kit contains a high-performance step-up switching

regulator, a 250mA low-dropout (LDO) linear regulator,

a high-speed op amp, a digitally adjustable VCOM cali-

brator, and seven high-voltage level-shifting buffers for

scan-driver applications.

The EV kit operates from a DC supply voltage from

+1.8V to +5.5V. The step-up switching regulator is con-

figured for a +8V output providing at least 300mA from

a +2.5V input. The positive charge pump is configured

for a +21.5V output providing up to 30mA. The negative

charge pump is configured for a -6.5V output providing

up to 30mA. The op amp is capable of providing up to

±150mA peak and features a programmable output

voltage initially configured for +3.2V. The low-voltage,

low-dropout linear regulator can provide at least

250mA. The high-voltage, level-shifting scan driver

buffers seven logic inputs and shifts them to a desired

level to drive TFT LCD row logic.

The MAX17094 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 MAX17094 thin QFN package

(0.8mm max height), with low-profile external compo-

nents, allows this circuit to be less than 2mm high.

The MAX17094 EV kit provides an on-board I

SMBus™ interface and connects to the computer through

the universal serial bus (USB) port. The EV kit includes

Windows

2000/XP

and Windows Vista

-compatible

software that provides a graphical user interface (GUI) for

control of the MAX17094’s programmable features.

Features

o +1.8V to +5.5V Input Range

o Adjustable 450kHz to 1.2MHz Step-Up Switching

Frequency

o Output Voltages

+8V Output at 300mA (Step-Up Switching

Regulator)

+21.5V Output at 30mA (Positive Charge Pump)

-6.5V Output at 30mA (Negative Charge Pump)

+2.5V at 250mA (Linear Regulator)

±150mA High-Current Op-Amp Output

o Resistor-Adjustable Switching Regulator and Op-

Amp Output Range

o Digitally Programmable Op-Amp Output Voltage

o +30V to -10V High-Voltage Level-Shifting Drivers

o > 85% Efficiency (Step-Up Switching Regulator)

o On-Board I

C/SMBus Interface Control through

USB

o Windows 2000/XP- and Windows Vista (32-Bit)-

Compatible Software

o 2mm Low-Profile Surface-Mount Components

o Lead(Pb)-Free and RoHS Compliant

o Fully Assembled and Tested

Evaluates: MAX17094

MAX17094 Evaluation Kit

________________________________________________________________

Maxim Integrated Products

19-4451; Rev 0; 2/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

SMBus is a trademark of Intel Corp.

Windows, Windows XP, and Windows Vista are registered

trademarks of Microsoft Corp.

Ordering Information

PART TYPE

MAX17094EVKIT+ EV Kit

Denotes lead(Pb)-free and RoHS compliant.

Component List

DESIGNATION

QTY

DESCRIPTION

C1 1

4.7µF ±10%, 6.3V X5R ceramic

capacitor (0603)

Murata GRM188R60J475K

TDK C1608X5R0J475K

C2, C3 2

1µF ±20%, 6.3V X5R ceramic

capacitors (0402)

Murata GRM155R60J105K

TDK C1005X5R0J105M

C5 1

10µF ±20%, 6.3V X5R ceramic

capacitor (0603)

Murata GRM188R60J106M

TDK C1608X5R0J106K

DESIGNATION

QTY

DESCRIPTION

C6–C9, C14,

C16–C19, C34

0.1µF ±10%, 50V X7R ceramic

capacitors (0603)

Murata GRM188R71H104K

TDK C1608X7R1H104K

C10 0

Not installed, ceramic capacitor

(0805)

C11, C12 2

4.7µF ±10%, 16V X5R ceramic

capacitors (0805)

Murata GRM21BR61C475K

Taiyo Yuden EMK212BJ475KG

Summary of content (13 pages)

PAGE 1
9-4451; Rev 0; 2/09 MAX17094 Evaluation Kit Features The MAX17094 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that provides the voltages and features required for active-matrix, thinfilm transistor (TFT), liquid-crystal displays (LCDs).
PAGE 2
Evaluates: MAX17094 MAX17094 Evaluation Kit Component List (continued) DESIGNATION C13 C15 C20–C27 C28, C29, C31, C58–C65 C30 C32 C33 C35 C36–C39, C42, C44 C40, C43, C45 C41, C48–C53, C57 C46, C47 C54, C55 2 QTY DESCRIPTION 1 1000pF ±10%, 50V X7R ceramic capacitor (0402) Murata GRM155R71H102K TDK C1005X7R1H102K 1 0.
PAGE 3
MAX17094 Evaluation Kit DESIGNATION QTY R25 0 DESCRIPTION R30, R31 2 10kΩ ±5% resistors (0402) R35 1 169kΩ ±1% resistor (0603) R36 1 100kΩ ±1% resistor (0603) R37, R38 2 27Ω ±5% resistors (0603) R39 1 1.5kΩ ±5% resistor (0603) R40 1 2.
PAGE 4
Evaluates: MAX17094 MAX17094 Evaluation Kit Quick Start Recommended Equipment • • 1.8V to 5.5V, 2A DC power supply User-supplied Windows 2000/XP or Windows Vista PC with a spare USB port • Voltmeter Note: In the following sections, software-related items are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and underlined refers to items from the Windows operating system. 10) Procedure The MAX17094 EV kit is fully assembled and tested.
PAGE 5
MAX17094 Evaluation Kit The MAX17094 EV kit contains a high-performance step-up switching regulator, a 250mA LDO, a positive two-stage charge pump, a negative single-stage charge pump, a high-speed op amp, and seven highvoltage level-shifting buffers for scan-driver applications. The EV kit operates from a DC power supply between +1.8V and +5.5V that provides at least 2A. As configured, the step-up switching regulator (VMAIN) generates a +8V output and provides at least 300mA.
PAGE 6
Evaluates: MAX17094 MAX17094 Evaluation Kit Level-Shifter Logic-Level Inputs (JU5–JU11) The MAX17094 level-shifter inputs can be supplied either using the on-board logic or from an externally applied signal through configuration of jumpers JU5–JU11. Additionally, when using on-board logic, SW1 controls the logic levels based on its own settings. When SW1 is on, the logic input is high. When SW1 is off, the logic input is pulled low through a 100kΩ pulldown resistor.
PAGE 7
MAX17094 Evaluation Kit Evaluates: MAX17094 Figure 2. Command Module Interface Window Table 6. SMBus Commands CONTROL SMBus COMMAND Load DAC SMBusWriteByte Input the desired 7-bit DAC setting into the Data Out combo box. The 7-bit DAC value should be stored in the lower 7 bits (b6–b0) of the byte; the MSB is ignored. Read DAC SMBusReadByte Receives 8 bits from the device. The lower 7 bits correspond to the current DAC setting and the MSB is ignored.
PAGE 8
Evaluates: MAX17094 MAX17094 Evaluation Kit Figure 3a.
PAGE 9
MAX17094 Evaluation Kit Evaluates: MAX17094 Figure 3b.
PAGE 10
Evaluates: MAX17094 MAX17094 Evaluation Kit Figure 3c.
PAGE 11
MAX17094 Evaluation Kit Evaluates: MAX17094 Figure 4.
PAGE 12
Evaluates: MAX17094 MAX17094 Evaluation Kit Figure 5.
PAGE 13
MAX17094 Evaluation Kit Evaluates: MAX17094 Figure 6. MAX17094 EV Kit PCB Layout—Solder Side 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.