MAX17122EVKIT+

19-5089; Rev 0; 12/09 MAX17122 Evaluation Kit The MAX17122 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that provides the voltages and features required for thin-film transistor (TFT), liquidcrystal display (LCD) TV panels. The EV kit includes a step-down regulator, step-up regulator, negative output buck-boost regulator, positive regulated charge pump, and a negative linear regulator. The MAX17122 IC operates from +10V to +14V input voltages and is optimized for LCD TV panels running directly from +12V supplies. The step-up switching regulator is configured for a +15V output that provides at least 2.2A with an input voltage of +12V. The step-down regulator is configured for a +3.3V output that provides at least 2.5A and the buck-boost is configured for a temperature-variable -12V to -20V output that provides at least 450mA. The positive regulated charge pump is configured for a +28V output providing at least 100mA. The negative linear regulator is configured for a -7.5V output providing at least 100mA. Features S +10V to +14V Input Range S 750kHz Switching Frequency S Output Voltages +15V Output at 2.2A (Step-Up Switching Regulator) +3.3V Output at 2.5A (Step-Down Switching Regulator) -12V to -20V Output at 450mA (TemperatureVariable Buck-Boost Switching Regulator) +28V Output at 100mA (Positive Charge Pump) -7.5V Output at 100mA (Negative Linear Regulator) +5V Output at 25mA (Linear Regulator VL) S Greater than 94% Efficiency (Step-Up Switching Regulator) S Fully Assembled and Tested Ordering Information PART TYPE MAX17122EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION C1, C2 C3, C9, C11, C13 C4 C5, C10 QTY DESCRIPTION 2 22FF Q20%, 16V X5R ceramic capacitors (1206) Murata GRM31CR61C226M Taiyo Yuden EMK316BJ226M 4 0.1FF Q10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H104K TDK C1608X7R1H104K 1 22FF Q20%, 6.3V X5R ceramic capacitor (0805) Murata GRM21BR60J226M TDK C2012X5R0J226K 2 0.22FF Q10%, 25V X7R ceramic capacitors (0603) Murata GRM188R71E224K TDK C1608X7R1E224K DESIGNATION QTY DESCRIPTION C6, C16 2 1FF Q10%, 25V X5R ceramic capacitors (0603) Murata GRM188R61E105K TDK C1608X5R1E105M C7, C8, C15, C23, C24, C25 0 Not installed, ceramic capacitors (0603) 1 2.2FF Q10%, 16V X5R ceramic capacitor (0603) Murata GRM188R61C225K TDK C1608Y5V1C225ZT 1 1FF Q10%, 50V X7R ceramic capacitor (1206) Murata GRM31MR71H105KA TDK C3216X7R1H105K 1 470pF Q10% 50V X7R ceramic capacitor (0603) Murata GRM188R71H471K TDK C1608X7R1H471K C12 C14 C17 ________________________________________________________________ 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. Evaluates: MAX17122 General Description Evaluates: MAX17122 MAX17122 Evaluation Kit Component List (continued) DESIGNATION C18, C21, C22 C19 C20 C26, C27 C28 C36 D1, D2 D3 D4 QTY DESCRIPTION 3 22FF Q20%, 25V X5R ceramic capacitors (1210) Murata GRM32ER61E226K Murata GRM32ER61E226M 1 10FF Q10%, 16V X5R ceramic capacitor (0805) Murata GRM21BR61C106K KEMET C0805C106K4PAC 1 330pF Q10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H331K TDK C1608X7R1H331K DESCRIPTION 1 P1 1 High-gain, -25V pnp transistor (DPAK) Fairchild KSH210 On Semi MJD210 Q1 1 -30V, 0.056I p-channel MOSFET (6 SC70 PowerPAK) Vishay SiA421DJ R1 1 365kI Q1% resistor (0603) 1 33.2kI Q1% resistor (0603) 2 12pF Q5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H120J TDK C1608C0G1H120J R2 R3 1 39.2kI Q1% resistor (0603) R4 1 324kI Q1% resistor (0603) R5 1 182kI Q1% resistor (0603) R6, R13 2 22.1kI Q1% resistors (0603) 1 15pF Q5%, 50V C0G ceramic capacitor (0402) Murata GRM1555C1H150J TDK C1005C0G1H150J R7, R22 2 47.5kI Q1% resistors (0603) R8 1 10kI Q1% NTC resistor (0402) Murata NCP15XH103F03RC 0 Not installed, through-hole OSCON capacitor (OSCON-B) 2 30V, 3A Schottky diodes (M flat) Toshiba CMS02 1 50V, 1A Schottky diode (SMA) Fairchild SS15 Diodes, Inc. B150 1 Small-signal diode (SOT23) Fairchild BAT54S Diodes, Inc. BAT54S 4 Test points JU1– JU4 4 2-pin headers 2 4.7FH, 3.5A inductors TOKO FDV0620-4R7M Sumida CDRH6D26HPNP-4R7P NEC TOKIN MPLC0730L4R7 1 22FH, 1.6A inductor Sumida CDRH8D28NP-220N L3 QTY High-gain, +25V npn transistor (DPAK) Fairchild KSH200 On Semi MJD200 GATE, SS, TP1, TP2 L1, L2 DESIGNATION N1 R9 1 8.25kI Q1% resistor (0603) R10, R16 2 510I Q5% resistors (0603) R11 1 226kI Q1% resistor (0603) R12 1 10.5kI Q1% resistor (0603) R14 1 82.5kI Q1% resistor (0603) R15, R20 2 10kI Q1% resistors (0603) R17, R18 2 100kI Q5% resistors (0603) R19, R21, R24 0 Not installed, resistors (0603) R19 is PC short; R21 and R24 are open R23 1 7.5kI Q1% resistor (0603) U1 1 TFT LCD power supply (40 TQFN-EP*) Maxim MAX17122ETL+ — 4 Shunts — 1 PCB: MAX17122 EVALUATION KIT+ *EP = Exposed pad. 2   _______________________________________________________________________________________ MAX17122 Evaluation Kit SUPPLIER PHONE WEBSITE Diodes, Inc. 805-446-4800 www.diodes.com Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com KEMET Corp. 864-963-6300 www.kemet.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com NEC TOKIN America, Inc. 408-324-1790 www.nec-tokinamerica.com ON Semiconductor 602-244-6600 www.onsemi.com Sumida Corp. 847-545-6700 www.sumida.com Taiyo Yuden 800-348-2496 www.t-yuden.com TDK Corp. 847-803-6100 www.component.tdk.com TOKO America, Inc. 847-297-0070 www.tokoam.com Toshiba America Electronic Components, Inc. 949-623-2900 www.toshiba.com/taec Vishay 402-563-6866 www.vishay.com Note: Indicate that you are using the MAX17122 when contacting these component suppliers. Quick Start Recommended Equipment U 10V to 14V, 5A DC power supply U Voltmeter Procedure The MAX17122 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. 1) Verify that shunts are not installed across jumpers JU1, JU2, and JU3. 2) Verify that a shunt is installed across jumper JU4. 3) Connect the positive terminal of the power supply to the VIN pad. Connect the negative terminal of the power supply to the PGND pads closest to VIN. 4) Set the power supply VIN to +12V. 5) Turn on the power supply and verify that the step-up switching regulator output (AVDD) is +15V. 6) Verify that the step-down switching regulator (3.3V) is +3.3V. 7) Verify that the buck-boost regulator (VGOFF2) is approximately -12V. 8) Verify that the positive charge-pump linear-regulator supply (VGON) is approximately +28V. 9) Verify that the negative charge-pump supply (VGOFF1) is approximately -7.5V. Detailed Description of Hardware Jumper Settings Several jumper settings in the following tables illustrate features of the MAX17122 EV kit. Enable Inputs (EN1, EN2) The MAX17122’s enable inputs can be configured through jumpers JU1 and JU2. JU1 controls the EN1 pin, which enables the step-down regulator and gates the EN2 function as well. JU2 controls pin EN2, which enables the step-up and positive charge-pump linear regulator when EN1 is high. When EN1 is low, all power outputs are disabled. When EN_ is high, the respective outputs are enabled. When EN_ is low, the respective outputs are disabled. See Table 1 for jumpers JU1 and JU2 configurations. Table 1. Jumpers JU1 and JU2 Functions (EN1, EN2) SHUNT POSITION JU1 JU2 Installed Installed EN1 PIN EN2 PIN OUTPUTS Connected to GND Connected to GND All disabled Installed Not installed Connected to GND Internally pulled high All disabled Not installed Installed Internally pulled high Connected to GND Step-down enabled Not installed* Not installed* Internally pulled high Internally pulled high All enabled *Default position. _______________________________________________________________________________________   3 Evaluates: MAX17122 Component Suppliers Evaluates: MAX17122 MAX17122 Evaluation Kit High-Voltage Stress Mode Input (JU3) The MAX17122’s high-voltage stress (HVS) mode is controlled through jumper JU3. When jumper JU3 is installed, HVS is connected to VL and the RHVS output is connected to AGND. When jumper JU3 is not installed, the HVS pin is left unconnected and the RHVS output is unconnected. See Table 2 for jumper JU3 configuration. Thermistor Network Connection (JU4) The 100FA current from the SET pin, together with resistor R23 at SET determines the cold-temperature output voltage. The network at the NTC pin controls the transition between the warm-temperature output voltage (determined by FB3 resistors R5 and R6) and the cold-temperature output voltage. As configured, the warm-temperature output voltage is -12V, slowly transitioning at approximately +25NC to the cold-temperature output voltage level of -20V. Refer to the MAX17122 IC data sheet for more information regarding temperature compensation. Jumper JU4 controls the thermistor network connected to the NTC pin. When JU4 is installed, thermistor R8 is connected to NTC and the behavior of the GOFF2 output voltage varies with temperature. When JU4 is not installed, NTC is connected to AGND through resistors R7 and R9 and GOFF2 output voltage is fixed. See Table 3 for jumper JU4 configuration. Step-Up Regulator Output-Voltage Selection (AVDD) The EV kit’s step-up switching-regulator output (AVDD) is set to +15V by feedback resistors R1 and R2. To generate output voltages other than +15V, select different external voltage-divider resistors (R1 and R2). Refer to the Step-Up Regulator, Output Voltage Selection section in the MAX17122 IC data sheet for more information. Step-Down Regulator Output-Voltage Selection (+3.3V) The EV kit’s step-down switching regulator supports both fixed and adjustable output voltages. By default, the EV kit’s step-down regulator’s output (3.3V) is set to the +3.3V fixed mode by connecting FB2 to GND through resistor R20. For adjustable mode (+1.5V to +3.6V), select R21 and R20 to set the desired step-down regulator output voltage. Refer to the Detailed Description, Step-Down Regulator section in the MAX17122 IC data sheet for instructions on selecting resistors R20 and R21. Buck-Boost Regulator Output-Voltage Selection (VGOFF2) The output voltage of the step-up regulator is temperature compensated. From the warm-temperature range ((3.3V - VNTC) > 1.65V), the output voltage is set by connecting a resistive voltage-divider from the output (VGOFF2) to the +3.3V reference, with the center tap connected to FB3. Select R6 in the 10kI to 50kI range. Calculate R5 with the following equation: V − VFB3 R5 = R6 × GOFF2_ WARM VFB3 − 3.3V where VFB3, the step-up regulator’s feedback set point, is +1.65V. Place R5 and R6 close to the IC. For cold temperatures ((3.3V - VNTC) < VSET), output voltage is set by: VSET = R6 × VGOFF2_ COLD + R5 × 3.3V R5 + R6 If the calculated VSET voltage is larger than +1.65V, then temperature compensation is disabled and the buck-boost regulator output will be VGOFF2_WARM at all temperatures. Calculate the SET pin resister RSET (R23) as follows: V RSET = SET 100µA Table 2. Jumper JU3 Function (HVS) Table 3. Jumper JU4 Function (NTC) SHUNT POSITION HVS PIN RHVS OUTPUT SHUNT POSITION THERMISTOR NETWORK GOFF2 OUTPUT Installed Connected to VL Connected to AGND Installed* Connected Varies over temperature Not installed* Internally pulled to GND Unconnected Not installed Not connected Fixed output *Default position. *Default position. 4   _______________________________________________________________________________________ MAX17122 Evaluation Kit The negative linear-regulator output (VGOFF1) is set to -7.5V by voltage-divider resistors R13 and R14. To set VGOFF1 to other voltages, adjust the negative linearregulator output voltage (VGOFF1) by connecting a resistive voltage-divider from VGOFF1 to +3.3V with the center tap connected to FBN. Select R13 in the 20kI to 50kI range. Calculate R14 with the following equation: V −V R14 = R13 × GOFF1 FBN VFBN − 3.3V where VFBN = +1V. Refer to the Negative Linear Regulator, Output-Voltage Selection section in the MAX17122 IC data sheet for instructions on selecting R13 and R14. Positive Charge-Pump Output-Voltage Selection (VGON) The positive charge-pump output (VGON) is set to +28V by voltage-divider resistors R11 and R12. To set VGON to other voltages, adjust the charge-pump regulator’s output voltage by connecting a resistive voltage-divider from the VGON output to AGND, with the center tap connected to FBP. Select the lower resistor of the divider R12 in the range of 10kI to 30kI. Calculate the upper resistor R11 with the following equation:  V R11 = R12 ×  GON − 1 V  FBP  where VFBP = +1.25V (typ). Refer to the Positive ChargePump Linear Regulator section in the MAX17122 IC data sheet for instructions on selecting R11 and R12. _______________________________________________________________________________________   5 Evaluates: MAX17122 Negative Linear Regulator Output-Voltage Selection (VGOFF1) Evaluates: MAX17122 MAX17122 Evaluation Kit Figure 1. MAX17122 EV Kit Schematic 6   _______________________________________________________________________________________ MAX17122 Evaluation Kit Evaluates: MAX17122 1.0” Figure 2. MAX17122 EV Kit Component Placement Guide— Component Side 1.0” Figure 3. MAX17122 EV Kit PCB Layout—Component Side 1.0” Figure 4. MAX17122 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. 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