MAX8795AEVKIT+ Maxim Integrated Products, MAX8795AEVKIT+ Datasheet

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MAX8795AEVKIT+

Manufacturer Part Number
MAX8795AEVKIT+
Description
Display Modules & Development Tools MAX8795A KIT MAX8795A KIT
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8795AEVKIT+

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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.
19-0822; Rev 0; 5/07
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.
DESIGNATION
C4, C5, C6
C16–C21
C7–C12,
C2, C3
C13
C1
QTY
12
________________________________________________________________ Maxim Integrated Products
1
2
3
0
100µF ±20%, 16V aluminum
electrolytic capacitor
SANYO 16ME100UAX (DxL = 6.3mm
x 5mm)
10µF ±10%, 6.3V X5R ceramic
capacitors (0805)
TDK C2012X5R0J106K
Taiyo Yuden JMK212BJ106MG
4.7µF ±10%, 25V X7R ceramic
capacitors (1206)
TDK C3216X7R1E475K
Taiyo Yuden TMK316BJ475KL
0.1µF ±10%, 50V X7R ceramic
capacitors (0603)
TDK C1608X7R1H104K
Murata GRM188R71H104K
Not installed, ceramic capacitor
General Description
DESCRIPTION
MAX8795A Evaluation Kit
♦ +4.5V to +5.5V Input Range
♦ Output Voltages
♦ Adjustable Output Voltages (External Resistors)
♦ 1.2MHz Switching Frequency
♦ Five High-Performance Op Amps
♦ 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 MAX8795A IC temperature range is -40°C to +85°C.
MAX8795AEVKIT+
DESIGNATION
C14, C24
+14V, 500mA (VMAIN)
+25V, 20mA (VPOS)
-10V, 50mA (VNEG)
130mA (Typ) Short-Circuit Current (Buffers)
C15
C22
C23
PART
QTY
2
1
1
1
Ordering Information
TEMP RANGE
0°C to +70°C*
0.22µF ±10%, 50V X7R ceramic
capacitors (0805)
Taiyo Yuden UMK212BJ224KT
TDK C2012X7R1H224K
0.22µF ±10%, 16V X7R ceramic
capacitor (0603)
TDK C1608X7R1C224K
Taiyo Yuden EMK107BJ224KA
1.5nF ±10%, 50 X7R ceramic
capacitor (0603)
TDK C1608X7R1H152K
Taiyo Yuden UMK107B152KZ
0.033µF ±10%, 25V X7R ceramic
capacitor (0603)
Murata GRM188R71E333K or
TDK C1608X7R1E333K
Component List
DESCRIPTION
IC PACKAGE
32 Thin QFN
(5mm x 5mm)
Features
1

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MAX8795AEVKIT+ Summary of contents

Page 1

... Low-Profile Surface-Mount Components ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX8795AEVKIT+ 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 MAX8795A IC temperature range is -40°C to +85°C. DESIGNATION QTY 0.22µ ...

Page 2

MAX8795A Evaluation Kit DESIGNATION QTY DESCRIPTION 220pF ±10%, 50V X7R ceramic C25 1 capacitor (0603) TDK C1608X7R1H221K Not installed, ceramic capacitors C26–C29 0 (0603) 68pF ±5%, 50V C0G ceramic capacitor (0603) C30 1 TDK C1608C0G1H680J Taiyo Yuden UMK107CG680JZ 30V, 3A ...

Page 3

Recommended Equipment • 4.5V to 5.5VDC, 5A power supply • Digital multimeters The MAX8795A 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 connections ...

Page 4

MAX8795A Evaluation Kit Output Voltage Selection Step-Up Switching-Regulator Output Voltage (VMAIN) The MAX8795A EV kit’s step-up switching-regulator output, limited by the built-in 20V n-channel MOSFET, is set to +14V through feedback resistors R1 and R2. To generate output voltages other ...

Page 5

Figure 1. MAX8795A EV Kit Schematic _______________________________________________________________________________________ MAX8795A Evaluation Kit 5 ...

Page 6

MAX8795A Evaluation Kit Figure 2. MAX8795A EV Kit Component Placement Guide—Component Side 6 _______________________________________________________________________________________ ...

Page 7

Figure 3. MAX8795A EV Kit PCB Layout—Component Side _______________________________________________________________________________________ MAX8795A Evaluation Kit 7 ...

Page 8

MAX8795A Evaluation Kit Figure 4. MAX8795A EV Kit PCB Layout—Internal Layer 2 (GND Plane) 8 _______________________________________________________________________________________ ...

Page 9

Figure 5. MAX8795A EV Kit PCB Layout—Internal Layer 3 (Signal/GND Plane) _______________________________________________________________________________________ MAX8795A Evaluation Kit 9 ...

Page 10

... 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2007 Maxim Integrated Products CARDENAS is a registered trademark of Maxim Integrated Products, Inc ...

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