View MAX1543EVKIT_284095.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-2881; Rev 0; 6/03
MAX1543 Evaluation Kit
General Description
The MAX1543 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 displays (LCDs). The EV kit contains 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 are two operational amplifiers that can be used to drive the LCD backplane (VCOM) or the gamma-correction divider string, and a logic-controlled, high-voltage switch with adjustable delay. The EV kit also evaluates the MAX1542 after IC replacement. The EV kit operates from a DC supply voltage of +2.6V to +5.5V. The step-up switching regulator is configured for a +8V output providing at least 250mA. The positive charge pump is configured for a +22V output providing at least 20mA. The negative charge pump is configured for a -7V output providing at least 20mA. The two operational amplifiers are both configured for +4V, each capable of providing up to 150mA peak. The highvoltage switch can be used to delay the startup of the positive charge pump's output. The delay time is set with an external capacitor. The MAX1543 EV kit demonstrates low quiescent current and high efficiency (85%) for maximum battery life. Operation at 1.2MHz allows the use of tiny surfacemount components. The MAX1543 QFN package (0.8mm maximum height) with low-profile external components allows this circuit to be less than 1.25mm high.
Features
o +2.6V to +5.5V Input Range o Output Voltages +8V Output at 300mA (3V Input Step-Up Switching Regulator) +22V Output at 20mA (Positive Charge Pump) -7V Output at 20mA (Negative Charge Pump) +4V Output at 150mA (Operational Amplifiers VOUT1 and VOUT2) o Resistor-Adjustable Switching Regulator and Op-Amp Output Voltages o Logic-Controlled, High-Voltage Switch with Adjustable Delay o Greater than 85% Efficiency (Step-Up Switching Regulator) o Selectable 600kHz/1.2MHz Step-Up Switching Frequency o Low-Profile Surface-Mount Components o Also Evaluates the MAX1542 (IC Replacement Required) o Fully Assembled and Tested
Evaluates: MAX1542/MAX1543
Ordering Information
PART MAX1543EVKIT TEMP RANGE 0C to +70C IC PACKAGE 20 TQFN (5mm x 5mm x 0.8mm)
Quick Start Component List
DESIGNATION C2, C7, C8, C9 C3 QTY 0 1 DESCRIPTION Capacitors (0603), not installed 10F 10%, 6.3V X5R ceramic capacitor (1206) TDK C3216X5R0J106K-0.85 4.7F 10%, 10V X5R ceramic capacitors (1210) TDK C3225X5R1A475K-1.15 220pF 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H221K 0.033F 10%, 25V X7R ceramic capacitor (0603) TDK C1608X7R1E333K
The MAX1543 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 completed.
Recommended Equipment
* +2.6V to +5.5V, 2A DC power supply * Voltmeter
C4, C5
2
Procedure
1) Verify there is no shunt across jumper JU1. 2) Verify there is a shunt installed across jumper JU2. 3) Connect the positive terminal of the power supply to the VIN pad. Connect the negative terminal of the power supply to the GND pad. 4) Turn on the power supply and verify the step-up switching regulator output (VMAIN) is +8V.
C6
1
C10
1
________________________________________________________________ Maxim Integrated Products
1
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.
MAX1543 Evaluation Kit Evaluates: MAX1542/MAX1543
Component List (continued)
DESIGNATION C11-C16, C18, C19 QTY 8 DESCRIPTION 0.1F 10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H104K 100F 20%, 16V aluminum electrolytic capacitor (6.3mm x 5mm) Sanyo 16MV100UAX 1A, 30V Schottky diode (S-flat) Toshiba CRS02 200mA, 100V dual ultra-fast diodes (SOT23) Fairchild MMBD4148SE DESIGNATION L1 R1 R2 R3-R6 R7, R9, R18 R13-R17, R19 U1 JU1, JU2 None None QTY 1 1 1 4 3 0 1 2 2 1 DESCRIPTION 4.7H, 1.1A inductor Sumida CLS5D11HP-4R7 169k 1% resistor (0805) 30.9k 1% resistor (0805) 100k 1% resistors (0805) 100k 5% resistors (0805) Resistors (0805), not installed MAX1543ETP (20-pin TQFN) 2-pin headers Shunts (JU1, JU2) MAX1543 PC board
C17
1
D1
1
D2, D3, D4
3
Component Suppliers
SUPPLIER Fairchild Sanyo Sumida TDK Toshiba PHONE 888-522-5372 619-661-6322 847-545-6700 847-803-6100 949-455-2000 FAX N/A 619-661-1055 847-545-6720 847-390-4405 949-859-3963 WEBSITE www.fairchildsemi.com www.sanyovideo.com www.sumida.com www.component.tdk.com www.toshiba.com/taec
Note: Please indicate that you are using the MAX1543 when contacting these component suppliers.
5) Verify the gate-on supply (GON) is approximately +22V. 6) Verify the gate-off supply (GOFF) is approximately -7V. 7) Verify the operational amplifier output 1 (VOUT1) is +4V. 8) Verify the operational amplifier output 2 (VOUT2) is +4V. 9) Verify the high-voltage switch output (COM) is +22V. For instructions on selecting the step-up switching regulator feedback and op-amp divider resistors for other output voltages, see the Output Voltage Selection section.
selectable between 600kHz and 1.2MHz. The EV kit also evaluates the MAX1542 after replacing IC U1. As configured, the step-up switching regulator (VMAIN) generates a +8V output and can provide at least 250mA from a +2.6V input. It also provides at least 300mA from a +3.0V input and 500mA from a +5V input. The step-up switching-regulator output voltage can be adjusted up to +13V with other feedback resistors (see the Output-Voltage Selection section). The GON supply consists of two positive charge-pump stages to generate approximately +22V and can provide greater than 20mA. The GOFF supply consists of a single negative charge-pump stage to generate approximately -7V and can provide greater than 20mA. The operational amplifier outputs, VOUT1 and VOUT2, are set to +4V and can source or sink approximately 150mA. These two outputs can be reconfigured to other voltages by changing the voltage-divider resistors (see the Output-Voltage Selection section). The high-voltage switch between the SRC and COM pins can be used to delay the GON output startup. The GON voltage is connected to the source of the switch (SRC),
Detailed Description
The MAX1543 EV kit contains a step-up switching regulator, a positive two-stage charge pump, a negative single-stage charge pump, two operational amplifiers, and a high-voltage switch matrix. The EV kit operates from a DC power supply between +2.6V and +5.5V that can provide at least 2A. The switching frequency is jumper
2
_______________________________________________________________________________________
MAX1543 Evaluation Kit
and the drain of the switch (COM) is used as an output. The startup delay time is set with an external capacitor at the DEL pin. Refer to the Delay Control Circuit section in the MAX1543 data sheet for information on setting the delay time. The switch between the SRC and COM pins and the switch between the COM and DRN pins can be controlled by jumper JU2 or by external logic connected to the CTL pad. See Table 2 for switch states and refer to the Delay Control Circuit section in the MAX1543 data sheet for further information about the high-voltage switches connected to the COM pin. The MAX1543 EV kit also evaluates the MAX1542. To evaluate the MAX1542, replace U1 with a MAX1542 IC (refer to the MAX1542/MAX1543 data sheet for specifications of the MAX1542). Inductor Selection section in the MAX1542/MAX1543 data sheet).
Evaluates: MAX1542/MAX1543
High-Voltage Switch Control (CTL)
The MAX1543 EV kit features an option to control the high-voltage switches between SRC, COM, and DRN on the MAX1543 or the high-voltage switch between SRC and COM on the MAX1542. Table 2 lists the selectable JU2 jumper options.
Output-Voltage Selection
Step-Up Switching-Regulator Output Voltage (VMAIN)
The MAX1543 EV kit's step-up switching-regulator output (VMAIN) is set to +8V by feedback resistors R1 and R2. To generate output voltages other than +8V (up to +13V), select different external voltage-divider resistors, R1 and R2. Note that changing the VMAIN voltage setting also changes the GON and GOFF charge-pump output voltages. Output capacitors C4 and C5 are rated for +10V. To set the output voltage greater than +10V, use higher voltage-rated capacitors. Refer to the Main Step-Up Converter and Output Voltage sections in the MAX1542/MAX1543 data sheet for instructions on selecting resistors R1 and R2.
Jumper Selection
Switching-Frequency Selection (FREQ)
The MAX1543 EV kit features an option to choose the step-up regulator switching frequency. Jumper JU1 selects the switching frequency. Table 1 lists the selectable jumper options. The EV kit is configured for 1.2MHz operation. Optimum performance at lower frequencies requires a larger inductor value (refer to the
Table 1. Jumper JU1 Functions
SHUNT LOCATION None (default) Installed FREQ PIN Connected to VIN through R7 Connected to GND MAX1543 EV KIT FREQUENCY 1.2MHz 600kHz
Operational-Amplifier Output Voltages (VOUT1 and VOUT2)
The MAX1543's operational amplifiers are configured as unity-gain buffers by the PC board traces shorting R14 between NEG1 and OUT1 and R16 between NEG2 and OUT2. The voltages at the noninverting inputs POS1 and POS2 are set to half of VMAIN by voltagedivider resistors (R3, R4) and (R5, R6), respectively. To set VOUT1 and VOUT2 to other voltages (up to VMAIN), select different divider resistors.
Table 2. Jumper JU2 Functions
SHUNT LOCATION Installed (default) None CTL PIN Connected to VIN Connected to PGND through R18 Connected to external logic MAX1543 COM COM connected to SRC (GON, +22V) COM connected to DRN Logic low, COM connected to DRN; logic high, COM connected to SRC (GON, +22V) MAX1542 COM COM connected to SRC (GON, +22V) COM disconnected from SRC (GON, +22V) Logic low, COM disconnected from SRC (GON, +22V); logic high, COM connected to SRC (GON, +22V)
None
_______________________________________________________________________________________
3
MAX1543 Evaluation Kit Evaluates: MAX1542/MAX1543
GON GOFF -7V C12 0.1F 3 1 D2 C11 0.1F 2 1 D3 3 C13 0.1F 2 C14 0.1F VMID 3 1 D4 2 C15 0.1F GON +22V
GND
GND
VIN +2.5V TO +5.5V C17 100F 16V C3 10F 6.3V
L1 4.7H R7 100k 14 JU1 15 FREQ IN
D1 R1 169k 1% FB 16 R2 30.9k 1% SUP 12 C2 OPEN C8 OPEN R13 OPEN NEG1 7 R14 SHORT (PC TRACE) VOUT1 +4V TP1 R3 100k 1% R5 100k 1% C4 4.7F 10V C5 4.7F 10V
VMAIN +8V
GND
GND
13 LX
17 R9 100k C6 220pF C7 OPEN 3 4 5
R19 SHORT (PC TRACE)
COMP
U1
I.C. PGND AGND
MAX1543
GND
GON C16 0.1F COM
2
SRC
OUT1 POS1
8 6
C18 0.1F 1 COM R15 OPEN 20 DRN NEG2 10 R16 SHORT (PC TRACE) C9 OPEN TP2
R4 100k 1%
R6 100k 1%
DRN
GND
VIN CTL 19 R17 SHORT (PC TRACE)
OUT2 POS2 DEL 18
9 11
VOUT2 +4V
CTL
JU2
C19 0.1F
GND
R18 100k
C10 0.033F
Figure 1. MAX1543 EV Kit Schematic 4 _______________________________________________________________________________________
MAX1543 Evaluation Kit Evaluates: MAX1542/MAX1543
Figure 2. MAX1543 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX1543 EV Kit PC Board Layout--Component Side
Figure 4. MAX1543 EV Kit PC Board Layout--GND Layer 2
Figure 5. MAX1543 EV Kit PC Board Layout--VCC Layer 3
_______________________________________________________________________________________
5
MAX1543 Evaluation Kit Evaluates: MAX1542/MAX1543
Figure 6. MAX1543 EV Kit PC Board 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.
6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX1543EVKIT

	To Download MAX1543EVKIT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .