General Description

The MAX8795A evaluation kit (EV kit) is a fully assem-

bled and tested surface-mount printed-circuit board

(PCB) that contains a step-up switching regulator, a

positive charge pump postregulated by a high-voltage

linear regulator, a negative charge pump postregulated

by a high-voltage negative linear regulator, and five

high-current operational amplifiers (op amps). The pri-

mary step-up converter is configured for a +14V output

(VMAIN) and provides at least 500mA from a +4.5VDC

supply voltage.

The positive and negative linear-regulator controllers

postregulate the charge-pump outputs for TFT gate-on

and gate-off supplies. The positive linear regulator is

set to +25V output (VPOS) and provides at least 20mA.

The negative linear regulator is set to -10V output

(VNEG) and provides at least 50mA. Power to the posi-

tive charge-pump input comes from the step-up switch-

ing-regulator output, while power to the negative

charge-pump input comes from the power ground.

The EV kit also features five high-performance op amps

designed to drive the LCD backplane (VCOM). Power

to the VCOM buffers comes from the step-up switching

regulator output. The MAX8795A EV kit demonstrates

low quiescent current and high efficiency for maximum

battery life. High-frequency (1.2MHz) operation allows

the use of tiny surface-mount components to minimize

the thickness of LCD panel designs.

Features

♦ +4.5V to +5.5V Input Range

♦ Output Voltages

+14V, 500mA (VMAIN)

+25V, 20mA (VPOS)

-10V, 50mA (VNEG)

♦ Adjustable Output Voltages (External Resistors)

♦ 1.2MHz Switching Frequency

♦ Five High-Performance Op Amps

130mA (Typ) Short-Circuit Current (Buffers)

♦ Low-Profile Surface-Mount Components

♦ Fully Assembled and Tested

MAX8795A Evaluation Kit

________________________________________________________________

Maxim Integrated Products

1

19-0822; Rev 0; 5/07

Component List

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.

Ordering Information

PART

TEMP RANGE

IC PACKAGE

MAX8795AEVKIT+

0°C to +70°C*

32 Thin QFN

(5mm x 5mm)

DESIGNATION

QTY

DESCRIPTION

C1

1

100µF ±20%, 16V aluminum

electrolytic capacitor

SANYO 16ME100UAX (DxL = 6.3mm

x 5mm)

C2, C3

2

10µF ±10%, 6.3V X5R ceramic

capacitors (0805)

TDK C2012X5R0J106K

Taiyo Yuden JMK212BJ106MG

C4, C5, C6

3

4.7µF ±10%, 25V X7R ceramic

capacitors (1206)

TDK C3216X7R1E475K

Taiyo Yuden TMK316BJ475KL

C7–C12,

C16–C21

12

0.1µF ±10%, 50V X7R ceramic

capacitors (0603)

TDK C1608X7R1H104K

Murata GRM188R71H104K

C13

0

Not installed, ceramic capacitor

DESIGNATION

QTY

DESCRIPTION

C14, C24

2

0.22µF ±10%, 50V X7R ceramic

capacitors (0805)

Taiyo Yuden UMK212BJ224KT

TDK C2012X7R1H224K

C15

1

0.22µF ±10%, 16V X7R ceramic

capacitor (0603)

TDK C1608X7R1C224K

Taiyo Yuden EMK107BJ224KA

C22

1

1.5nF ±10%, 50 X7R ceramic

capacitor (0603)

TDK C1608X7R1H152K

Taiyo Yuden UMK107B152KZ

C23

1

0.033µF ±10%, 25V X7R ceramic

capacitor (0603)

Murata GRM188R71E333K or

TDK C1608X7R1E333K

+

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

*

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

The MAX8795A IC temperature range is -40°C to +85°C.