MAX17075EVKIT+ [MAXIM]
1.2MHz Switching Frequency;
| 型号： | MAX17075EVKIT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1.2MHz Switching Frequency |
| 文件： | 总7页 (文件大小：168K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4396; Rev 0; 12/08
MAX17075 Evaluation Kit
Evluates:MAX1075
General Description
Features
♦ +2.5V to +5.5V Input-Voltage Range
The MAX17075 evaluation kit (EV kit) is a fully assem-
bled and tested surface-mount circuit board that pro-
vides 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-up switching regulator, a two-stage pos-
itive charge pump for the TFT gate-on supply, a single-
stage negative charge pump for the TFT gate-off sup-
ply, and a high-current op amp. Also included is a logic-
controlled high-voltage switch array, with capacitor con-
trol delay, for the positive gate-driver supply. A capaci-
tive dummy load is provided at the high-voltage switch
output for ease of testing without an attached panel.
♦ Output Voltages (+4.5V to +5.5V Input Voltage)
+13V Output at 500mA (Step-Up Switching
Regulator)
+30V Output at 30mA (Positive Charge Pump)
-7V Output at 60mA (Negative Charge Pump)
High-Current Op Amp ( 500mA Peaꢀ Current)
♦ 1.2MHz Switching Frequency
♦ All Output Voltages are Resistor Adjustable
♦ Logic-Controlled High-Voltage Switches with
The MAX17075 EV kit is designed to operate from a DC
supply voltage of +2.5V to +5.5V. At +5V ( 10ꢀ) nomi-
nal input voltage, the step-up switching regulator pro-
vides a +13V output and up to 500mA. The positive
charge pump provides a +30V output and up to 30mA.
The negative charge pump provides a -7V output and
up to 60mA. The high-current op amp provides a +6.5V
output that can source or sink 500mA peak current. The
high-voltage switch array is controlled by external logic.
Capacitor Control Delay
♦ Low-Profile Surface-Mount Components
♦ Lead(Pb)-Free and RoHS Compliant
♦ Fully Assembled and Tested
Ordering Information
PART
TYPE
The MAX17075 switches at 1.2MHz, allowing the use of
tiny surface-mount components. The MAX17075 thin
QFN package (0.8mm maximum height) with low-profile
external components allows this circuit to be less than
3mm high.
MAX17075EVKIT+
EV Kit
+Denotes lead(Pb)-free RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.033µF 10ꢀ, 16V X7R ceramic
capacitor (0603)
Murata GRM188R71C333K
TDK C1608X7R1E333K
10µF 20ꢀ, 6.3V X5R ceramic
capacitors (0603)
Murata GRM188R60J106M
TDK C1608X5R0J106M
C8
C9
1
1
2
4
1
C1, C2
C3, C4
C5
2
2
1
1
1
0.22µF 10ꢀ, 6.3V X5R ceramic
capacitor (0402)
Murata GRM155R60J224K
TDK C1005X5R0J224K
10µF 20ꢀ, 25V X5R ceramic
capacitors (1206)
Murata GRM31CR61E106M
TDK C3216X5R1E106M
1µF 10ꢀ, 50V X7R ceramic
capacitors (1206)
Murata GRM31MR71H105KA
TDK C3216X7R1H105K
1µF 10ꢀ, 6.3V X5R ceramic
capacitor (0402)
Murata GRM155R60J105K
TDK C1005X5R0J105K
C10, C14
0.1µF 10ꢀ, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
TDK C1608X7R1H104K
1µF 10ꢀ, 25V X5R ceramic
capacitor (0603)
Murata GRM188R61E105K
TDK C1608X5R1E105K
C11, C15, C16,
C17
C6
220pF 10ꢀ, 50V X7R ceramic
capacitor (0402)
Murata GRM155R71H221K
TDK C1005X7R1H221K
1000pF 10ꢀ, 50V X7R ceramic
capacitor (0805)
Murata GRM216R71H102K
TDK C2012X7R1H102K
C12
C7
________________________________________________________________ Maxim Integrated Products
1
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.
MAX17075 Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
0.01µF 10ꢀ, 10V X5R ceramic
capacitor (0402)
Murata GRM155R61A103K
TDK C1005X5R1A103K
Not installed, transistor (SOT223)
Recommended: -20V, -1.5A pnp
transistor (SOT223)
C13
C18
1
1
Q2
0
Fairchild BCP69
1500pF 10ꢀ, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H152K
TDK C1608X7R1H152K
R1
R2
1
0
10Ω 5ꢀ resistor (0603)
Not installed, 100Ω 5ꢀ resistor
(0603) recommended
R3, R4, R5, R7
4
1
1
2
1
1
1
1
1
1
100kΩ 1ꢀ resistors (0603)
13.7kΩ 1ꢀ resistor (0603)
187kΩ 1ꢀ resistor (0603)
20kΩ 1ꢀ resistors (0603)
82kΩ 5ꢀ resistor (0603)
8.45kΩ 1ꢀ resistor (0603)
10kΩ 1ꢀ resistor (0603)
10kΩ 5ꢀ resistor (0603)
1kΩ 5ꢀ resistor (0603)
464kΩ 1ꢀ resistor (0603)
C19
C20
0
0
Not installed, capacitor (1206)
Not installed, capacitor (0402)
R6
R8
0.22µF 10ꢀ, 25V X7R ceramic
capacitor (0603)
Murata GRM188R71E224K
TDK C1608X7R1E224K
R9, R16
R10
C21
1
R11
3A, 30V Schottky diode (M-Flat)
Toshiba CMS02
(Top Mark: S2)
R12
D1
1
3
R13
Evluates:MAX1075
R14
220mA, 100V dual diodes (SOT23)
Fairchild MMBD4148SE
(Top Mark: D4)
R15
D2, D3, D4
10kΩ SMT cermet trimmer, 9 to 15
turns
R17
U1
1
1
JU1
1
2
3-pin header
2-pin headers
JU2, JU3
Boost regulator (24 TQFN)
Maxim MAX17075ETG+
3µH, 3A inductor
DC
Sumida CDRH6D28-3R0
L1
1
—
—
3
1
Shunts
PCB: MAX17075 Evaluation Kit+
Not installed, transistor (SOT223)
Recommended: 20V, 1A npn
transistor (SOT223)
Q1
0
Fairchild BCP68
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Fairchild Semiconductor
Murata Electronics North America, Inc.
Sumida Corp.
888-522-5372
770-436-1300
847-545-6700
847-803-6100
949-623-2900
www.fairchildsemi.com
www.murata-northamerica.com
www.sumida.com
TDK Corp.
www.component.tdk.com
www.toshiba.com/taec
Toshiba America Electronic Components, Inc.
Note: Indicate that you are using the MAX17075 when contacting these component suppliers.
Procedure
Quick Start
Required Equipment
Before beginning, the following equipment is needed:
The MAX17075 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 are completed.
•
•
+4.5V to +5.5V, 5A DC power supply
One voltmeter
1) Verify that a shunt is installed across pins 2-3 of
jumper JU1 (VCOM unbuffered).
2
_______________________________________________________________________________________
MAX17075 Evaluation Kit
Evluates:MAX1075
2) Verify that a shunt is installed across jumper JU2
(VGON internally connected to SRC).
The VGOFF supply consists of a negative charge pump
that generates -7V and provides > 60mA. This output can
be adjusted from approximately 0 to -AVDD by replacing
feedback resistors R6 and R7 (refer to the Design
Procedure, Charge-Pump Regulators, Output-Voltage
Selection section in the MAX17075 IC data sheet).
3) Verify that no shunt is installed across jumper JU3
(VGON is not connected to capacitive dummy load
C18).
4) Connect the positive terminal of the power supply
to the VIN pad on the EV kit. Connect the negative
terminal of the power supply to the PGND pad next
to the VIN pad.
The MAX17075 provides a high-current op amp that
sources or sinks 500mA peak current. The op amp out-
put is configured for +6.5V (AVDD/2).
The MAX17075 contains two high-voltage switches that
operate in a complementary fashion. One of the switch-
es provides a connection between the COM (VGON
PCB pad) and SRC pins. The other switch provides a
connection between the COM and DRN pins. The
switches are controlled by an external TTL logic signal
connected to the CTL pad.
5) Turn on the power supply and set the supply to
+4.5V.
6) Verify that the step-up switching regulator output
(AVDD) is +13V.
7) Verify that the gate-on supply (VGON) is +30V.
8) Verify that the gate-off supply (VGOFF) is -7V.
9) Verify that the op-amp output (VCOM) is +6.5V.
When CTL is high, VGON is connected to SRC, charg-
ing VGON to the voltage of the positive charge pump at
the SRC pin. When CTL is low, VGON is connected to
DRN, allowing VGON to discharge toward AVDD
(through resistor R14). The MAX17075 EV kit also fea-
tures a capacitive dummy load of 1500pF (C18) at the
VGON output pad that can be connected through
jumper JU3 to simulate a TFT panel load for testing the
switch array.
Detailed Description of Hardware
The MAX17075 EV kit contains a step-up switching reg-
ulator, a positive charge pump, a negative charge
pump, a high-current op amp, and a high-voltage
switch array. The EV kit is configured to operate from a
DC power supply between +2.5V and +5.5V that pro-
vides at least 5A. The MAX17075 switching frequency
is 1.2MHz.
The high-voltage switch delay time can be configured
by replacing capacitor C8. Refer to the Power-Up
Sequence and Soft-Start section in the MAX17075 IC
data sheet for additional details.
With +5V input voltage, the step-up switching regulator
(AVDD) generates a +13V output and provides at least
500mA. The step-up switching regulator output voltage
can be adjusted up to +18V by replacing feedback
resistors R8 and R9 (refer to the Design Procedure,
Step-Up Regulator, Output-Voltage Selection section in
the MAX17075 IC data sheet). Operation at significantly
higher output voltages could reduce the available out-
put current and require changes in component values
or component voltage rating.
Jumper Selection
Op-Amp Output (VCOM)
Jumper JU1 configures the op-amp output (VCOM) on
the MAX17075 EV kit. The op-amp output (VCOM) of
the MAX17075 EV kit can be buffered with a push-pull
output stage, or unbuffered. See Table 1 for JU1 shunt
positions.
The gate-on (VGON) supply consists of a two-stage
positive charge pump that generates +30V and pro-
vides greater than 30mA. This output can be adjusted
up to approximately +3xAVDD by replacing feedback
resistors R15 and R16 (refer to the Design Procedure,
Charge-Pump Regulators, Output-Voltage Selection
section in the MAX17075 IC data sheet).
Table 1. JU1 Jumper Selection (VCOM)
SHUNT POSITION
VCOM
1-2*
2-3**
None
Buffered
Unbuffered
Not connected
*Install appropriate transistors Q1, Q2, and resistor R2 to buffer
the VCOM output. See the Component List.
**Default position.
_______________________________________________________________________________________
3
MAX17075 Evaluation Kit
High-Voltage Switch Control (CTL)
Jumper JU2 configures the positions of the high-
voltage switch control pin (CTL) of the MAX17075 IC.
The CTL pin can be controlled by an external logic con-
troller connected to the EV kit’s CTL pad. Remove the
shunt from jumper JU2 before connecting an
external controller to the CTL pad. See Table 2 for JU2
shunt positions.
Step-Up Regulator, Output-Voltage Selection section in
the MAX17075 IC data sheet for instructions on select-
ing resistors R8 and R9.
Positive Charge-Pump Output (SRC)
The positive charge-pump output (SRC) is set to +30V
by voltage-divider resistors R15 and R16. To set SRC to
other voltages (up to approximately 3xAVDD, limited to
+36V), select different voltage-divider resistors. Refer to
the Design Procedure, Charge-Pump Regulators,
Output-Voltage Selection section in the MAX17075 IC
data sheet for instructions on selecting resistors R15
and R16.
High-Voltage Switch Output (VGON)
Dummy Load
The MAX17075 EV kit features a capacitive dummy
load of 1500pF (C18) at the VGON output pad to simu-
late a TFT panel load to test the switch array. When
testing with an actual LCD panel, disconnect the
dummy load. Jumper JU3 connects and disconnects
the dummy load. Table 3 lists the selectable JU3
jumper options.
Negative Charge-Pump Output (VGOFF)
The negative charge-pump output (VGOFF) is set to
-7V by voltage-divider resistors R6 and R7. To set
VGOFF to other voltages (from 0 to -AVDD approxi-
mately), select different voltage-divider resistors. Refer
to the Design Procedure, Charge-Pump Regulators,
Output-Voltage Selection section in the MAX17075 IC
data sheet for instructions on selecting resistors R6 and
R7.
Output-Voltage Selection
Step-Up Switching Regulator Output Voltage
(AVDD)
Evluates:MAX1075
The MAX17075 EV kit’s step-up switching-regulator out-
put (AVDD) is set to +13V by feedback resistors R8 and
R9. To generate output voltages other than +13V (up to
+18V), select different voltage-divider resistors.
Operation at significantly higher output voltages could
reduce the available output current, and require
changes in component values or voltage rating for
capacitors C3 and C4. Refer to the Design Procedure,
Op-Amp Output (OUT)
The op-amp output (OUT) is set to +6.5V by voltage-
divider resistors R3 and R4. To set the outputs to other
voltages (from 0 to AVDD), select different voltage-
divider resistors.
Table 2. JU2 Jumper Selection (CTL)
SHUNT POSITION
CTL PIN CONNECTED TO
HIGH-VOLTAGE SWITCH CONFIGURATION
COM pin connected to SRC pin
COM pin disconnected from DRN pin
Installed
VIN
COM pin connected to DRN pin
COM pin disconnected from SRC pin
Not installed*
None
GND through resistor R5
CTL driven by external logic controller
CTL high: COM pin connected to SRC pin
CTL low: COM pin connected to DRN pin
External logic controller
through the CTL pad
*Default position.
Table 3. JU3 Jumper Selection (C18)
SHUNT POSITION
VGON
OPERATION
Dummy load testing
Installed
Connected to C18
Not connected to C18
Not installed*
Normal operation, no load
*Default position.
4
_______________________________________________________________________________________
MAX17075 Evaluation Kit
Evluates:MAX1075
Figure 1. MAX17075 EV Kit Schematic
_______________________________________________________________________________________
5
MAX17075 Evaluation Kit
Evluates:MAX1075
Figure 2. MAX17075 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX17075 EV Kit PCB Layout—Component Side
6
_______________________________________________________________________________________
MAX17075 Evaluation Kit
Evluates:MAX1075
Figure 4. MAX17075 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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