19-2881; Rev 0; 6/03 MAX1543 Evaluation Kit 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 ♦ +2.6V to +5.5V Input Range ♦ 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) ♦ Resistor-Adjustable Switching Regulator and Op-Amp Output Voltages ♦ Logic-Controlled, High-Voltage Switch with Adjustable Delay ♦ Greater than 85% Efficiency (Step-Up Switching Regulator) ♦ Selectable 600kHz/1.2MHz Step-Up Switching Frequency ♦ Low-Profile Surface-Mount Components ♦ Also Evaluates the MAX1542 (IC Replacement Required) ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX1543EVKIT 0°C to +70°C IC PACKAGE 20 TQFN (5mm x 5mm x 0.8mm) Quick Start Component List DESIGNATION QTY C2, C7, C8, C9 0 Capacitors (0603), not installed C3 1 10µF ±10%, 6.3V X5R ceramic capacitor (1206) TDK C3216X5R0J106K-0.85 2 4.7µF ±10%, 10V X5R ceramic capacitors (1210) TDK C3225X5R1A475K-1.15 C6 1 220pF ±10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H221K C10 1 0.033µF ±10%, 25V X7R ceramic capacitor (0603) TDK C1608X7R1E333K C4, C5 DESCRIPTION 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 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. ________________________________________________________________ Maxim Integrated Products 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. 1 Evaluates: MAX1542/MAX1543 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. Evaluates: MAX1542/MAX1543 MAX1543 Evaluation Kit Component List (continued) DESIGNATION QTY C11–C16, C18, C19 8 C17 D1 D2, D3, D4 1 1 3 DESCRIPTION DESIGNATION QTY L1 1 0.1µF ±10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H104K 100µF ±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 DESCRIPTION 4.7µH, 1.1A inductor Sumida CLS5D11HP-4R7 R1 1 169kΩ ±1% resistor (0805) R2 1 30.9kΩ ±1% resistor (0805) R3–R6 4 100kΩ ±1% resistors (0805) R7, R9, R18 3 100kΩ ±5% resistors (0805) R13–R17, R19 0 Resistors (0805), not installed U1 1 MAX1543ETP (20-pin TQFN) JU1, JU2 2 2-pin headers None 2 Shunts (JU1, JU2) None 1 MAX1543 PC board Component Suppliers PHONE FAX Fairchild SUPPLIER 888-522-5372 N/A www.fairchildsemi.com WEBSITE Sanyo 619-661-6322 619-661-1055 www.sanyovideo.com Sumida 847-545-6700 847-545-6720 www.sumida.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Toshiba 949-455-2000 949-859-3963 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. 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 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), _______________________________________________________________________________________ MAX1543 Evaluation Kit 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 FREQ PIN MAX1543 EV KIT FREQUENCY None (default) Connected to VIN through R7 1.2MHz Installed Connected to GND 600kHz Inductor Selection section in the MAX1542/MAX1543 data sheet). 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. 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 CTL PIN Installed (default) Connected to VIN None Connected to PGND through R18 None Connected to external logic MAX1543 COM MAX1542 COM COM connected to SRC (GON, +22V) COM connected to SRC (GON, +22V) COM connected to DRN COM disconnected from SRC (GON, +22V) Logic low, COM connected to DRN; logic high, COM connected to SRC (GON, +22V) Logic low, COM disconnected from SRC (GON, +22V); logic high, COM connected to SRC (GON, +22V) _______________________________________________________________________________________ 3 Evaluates: MAX1542/MAX1543 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). Evaluates: MAX1542/MAX1543 MAX1543 Evaluation Kit GON GOFF -7V 3 C11 0.1µF 1 C12 0.1µF GND L1 4.7µH C17 100µF 16V C3 10µF 6.3V R1 169kΩ 1% 13 LX IN FB 17 R2 30.9kΩ 1% COMP SUP 12 C6 220pF 4 5 GON 2 I.C. C4 4.7µF 10V C5 4.7µF 10V R19 SHORT (PC TRACE) C8 OPEN MAX1543 PGND AGND NEG1 SRC OUT1 C16 0.1µF POS1 TP1 R13 OPEN GND R14 SHORT (PC TRACE) VOUT1 +4V 7 8 COM TP2 COM R15 OPEN DRN 20 DRN NEG2 OUT2 VIN GND CTL JU2 CTL 19 R17 SHORT (PC TRACE) R18 100kΩ POS2 DEL R3 100kΩ 1% R5 100kΩ 1% R4 100kΩ 1% R6 100kΩ 1% 6 C18 0.1µF 1 10 9 R16 SHORT (PC TRACE) C9 OPEN GND VOUT2 +4V 11 18 C19 0.1µF C10 0.033µF Figure 1. MAX1543 EV Kit Schematic 4 GND C2 OPEN U1 3 GND D4 16 FREQ C7 OPEN R9 100kΩ C14 0.1µF 2 VMAIN +8V JU1 15 1 D1 R7 100kΩ 14 GON +22V 3 2 D3 D2 VIN +2.5V TO +5.5V GND 3 1 2 C15 0.1µF VMID C13 0.1µF _______________________________________________________________________________________ MAX1543 Evaluation Kit 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 Evaluates: MAX1542/MAX1543 Figure 2. MAX1543 EV Kit Component Placement Guide— Component Side Evaluates: MAX1542/MAX1543 MAX1543 Evaluation Kit 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 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.