MAX16928EVKIT+

19-6061; Rev 0; 10/11 MAX16928 Evaluation Kit Evaluates: MAX16928 General Description The MAX16928 evaluation kit (EV kit) is a fully assembled and tested surface-mount PCB that provides the voltages and features required for automotive thin-film transistor (TFT), liquid-crystal display (LCD) applications. The EV kit includes a boost converter, a 3.3V regulator controller with external npn transistor, two gate voltage regulators, a single-stage positive charge pump, and a single-stage negative charge pump. The EV kit can operate from 4.5V to 5.5V input voltages and is optimized for automotive TFT-LCD applications. The boost converter is configured for a 12V output that provides at least 400mA. The regulator controller output is 3.3V and provides at least 500mA. The positive-gate voltage regulator provides 18V output and the negativegate voltage regulator provides -5.9V. Features S 4.5V to 5.5V Input Range S Output Voltages 12V Output at 400mA (Boost Converter) 3.3V Output at 500mA (Regulator Controller) 18V Output (Positive-Gate Voltage Regulator) -5.9V Output (Negative-Gate Voltage Regulator) S High-Frequency Operation 2.2MHz (Boost Converter) S Single-Stage Positive and Negative Charge Pumps S Proven PCB Layout S Fully Assembled and Tested Ordering Information appears at end of data sheet. Component List DESIGNATION C1, C4, C22, C24 QTY 4 DESCRIPTION 10FF Q20%, 25V X7R ceramic capacitors (1210) Murata GRM32DR71E106M TDK C3225X7R1E106M 0.1FF Q10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H104K TDK C1608X7R1H104K C2, C3, C5, C14, C25, C27 6 C6 1 2.2FF Q10%, 10V X7R ceramic capacitor (0805) Murata GRM21BR71A225K C7 1 220pF Q10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H221K C8 1 22pF Q5%, 50V C0G ceramic capacitor (0603) Murata GRM1885C1H220J C9 1 150pF Q5%, 50V C0G ceramic capacitor (0603) Murata GRM1885C1H151J C12, C13, C21 C23, C37, C38, C39 3 0 1FF Q10%, 25V X7R ceramic capacitors (0805) Murata GRM21BR71E105K Not installed, ceramic capacitors (1210) DESIGNATION QTY DESCRIPTION C26 1 4.7FF Q20%, 25V X7R ceramic capacitor (1206) Murata GRM31CR71E475M D1, D6 2 200mA, 100V dual-series diodes (SOT23) Fairchild MMBD4148SE D2 1 3A, 30V Schottky diode (M Flat) Toshiba CMS02(TE12L,Q) D4 1 2A, 50V fast-recovery diode (SMB) Fairchild ES2A JU1, JU2 2 3-pin headers L1 1 3.3FH, 9A power inductor Würth 744314330 P1 1 -20V, -2.4A p-channel MOSFET (3 SuperSOT) Fairchild FDN304P Q1 1 npn bipolar transistor (SOT23) Fairchild MMBT3904 Q2 1 npn high-gain transistor (SOT89) Zetex ZXTN25012EZ R1 1 30kI Q1% resistor (0603) R2, R13 2 6.8kI Q5% resistors (0603) R5 1 180kI Q5% resistor (0603) __________________________________________________________________ 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. MAX16928 Evaluation Kit Evaluates: MAX16928 Component List (continued) DESIGNATION QTY R6 1 169kI Q1% resistor (0603) DESCRIPTION R7 1 10kI Q1% resistor (0603) R9, R16, R17 3 10kI Q5% resistors (0603) R10 1 100kI Q5% resistor (0603) R11 1 133kI Q1% resistor (0603) R12 R14 1 1 12.1kI Q1% resistor (0603) 316kI Q1% resistor (0603) DESIGNATION QTY R15 R18 1 1 DESCRIPTION U1 1 TFT-LCD power supply (20 TSSOP-EP ) Maxim MAX16928AGUP/V+ — 2 Shunts — 1 PCB: MAX16928 EVALUATION KIT 51.1kI Q1% resistor (0603) 33I Q5% resistor (0603) Component Suppliers SUPPLIER PHONE WEBSITE Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Toshiba America Electronic Components, Inc. 949-623-2900 www.toshiba.com/taec Würth Electronik GmbH & Co. KG 201-785-8800 www.we-online.com Zetex Semiconductors (Division of Diodes Incorporated) 805-446-4800 www.diodes.com Note: Indicate that you are using the MAX16928 when contacting these component suppliers. • MAX16928 EV kit Quick Start 8) Verify that the positive-gate voltage regulator (GH) is approximately 18V. Recommended Equipment 9) Verify that the negative-gate voltage regulator (VGL) is approximately -5.9V. • 4.5V to 5.5V, 2A DC power supply Detailed Description of Hardware • Voltmeter Procedure The 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 a shunt is installed on pins 1-2 on jumper JU1. 2) Verify that a shunt is installed on pins 2-3 on jumper JU2. 3) Connect the positive terminal of the power supply to the INA PCB pad. Connect the negative terminal of the power supply to the PGNDP PCB pad closest to INA. 4) Set the power-supply INA to 5V. 5) Turn on the power supply. 6) Verify that the step-up switching regulator (VSH) is 12V. 7) Verify that the 3.3V regulator is 3.3V. Jumper Settings Several jumper settings in the following tables illustrate features of the EV kit. Boost Circuitry and 3.3V Regulator Controller Enable Input (JU1) The device’s ENP pin enables the boost circuitry and the 3.3V regulator controller. For normal operation, drive ENP high by installing a shunt on pins 1-2 on jumper JU1. For shutdown mode, drive ENP low by installing a shunt on pins 2-3 on JU1. See Table 1 for JU1 configuration. Table 1. Jumper Functions (JU1) SHUNT POSITION ENP PIN VSH AND 3.3V OUTPUTS 1-2* Connected to INA Enabled 2-3 Connected to GND Disabled *Default position. __________________________________________________________________ Maxim Integrated Products   2 MAX16928 Evaluation Kit Evaluates: MAX16928 Table 2. Jumper Functions (JU2) SEQ PIN SUPPLY SEQUENCING ORDER 1-2 Connected to INA VSH, VGL, VGH 2-3* Connected to GND VSH, VGH, VGL SHUNT POSITION *Default position. Supply Sequencing (JU2) The device’s SEQ pin controls the order in which the VGH and VGL supplies are sequenced. When a shunt is installed on pins 1-2 on jumper JU2, VGL is turned on first followed by VGH. When a shunt is installed on pins 2-3, VGH is turned on first followed by VGL. See Table 2 for JU2 configuration. Output-Voltage Selection Boost Converter The EV kit’s boost-converter output (VSH) is set to 12V by feedback resistors R11 and R12. To generate output voltages other than 12V, select R12 in the 10kI to 50kI range and select R11 according to the following equation: V  R11 = R12 ×  VSH − 1  VFBP  where VVSH is the desired boost output voltage and VFBP is the boost converter’s feedback set point (1V typ). When increasing the boost output voltage, be careful not to exceed the absolute maximum rating of the CP pin (31V with INA = 5V and 29V with INA = 3.3V). Positive-Gate Voltage Regulator The EV kit’s positive-gate voltage regulator output (GH) is set to 18V by feedback resistors R6 and R7. To generate output voltages other than 18V, select R7 in the 10kI to 50kI range and select R6 according to the following equation:  V  R6 = R7 ×  GH − 1 V  FBGH  Negative-Gate Voltage Regulator The EV kit’s negative-gate voltage regulator output (VGL) is set to -5.9V by feedback resistors R14 and R15. To generate output voltages other than -5.9V, select R15 to be greater than 20kI to avoid loading down the reference output. Select R14 according to the following equation: V − VGL  R14 = R15 ×  FBGL   VREF − VFBGL  where VGL is the desired negative-gate regulator output voltage, VREF = 1.25V, and VFBGL is the negative-gate feedback set point (0.25V typ). Note that the negativegate voltage regulator is not short-circuit protected and can be damaged by overcurrent. Charge Pumps The EV kit provides a single-stage positive charge pump (VCP) and single-stage negative charge pump (VCN). The output voltages generated on the storage capacitors are given by: VVCP = 2 × VVSH + VSCHOTTKY − 2 × VD VVCN = −(VVSH + VSCHOTTKY − 2 × VD ) where VSCHOTTKY is the forward-voltage drop of the Schottky diode and VD is the forward-voltage drop of the charge-pump diode. Evaluating Other Versions of MAX16928 The EV kit comes standard with the MAX16928AGUP/ V+ IC installed, but can also evaluate several versions of the MAX16928. The IC provides a variety of power options to meet the most common automotive TFT-LCD display-power requirements, as outlined in the Ordering Information table in the MAX16928 IC data sheet. Note some components, such as the inductor value and compensation component values, may need to change when evaluating other versions of the IC. Refer to the Design Procedure section of the MAX16928 IC data sheet for further details. where VGH is the desired positive-gate regulator output voltage and VFBGH is the positive-gate feedback set point (1V typ). With the installed charge-pump doubler, GH voltages greater than approximately 2 x VSH cannot be produced. __________________________________________________________________ Maxim Integrated Products   3 MAX16928 Evaluation Kit Evaluates: MAX16928 Figure 1. MAX16928 EV Kit Schematic __________________________________________________________________ Maxim Integrated Products   4 MAX16928 Evaluation Kit Evaluates: MAX16928 1.0” Figure 2. MAX16928 EV Kit Component Placement Guide— Component Side 1.0” Figure 3. MAX16928 EV Kit PCB Layout—Component Side 1.0” Figure 4. MAX16928 EV Kit PCB Layout—Solder Side __________________________________________________________________ Maxim Integrated Products   5 MAX16928 Evaluation Kit Evaluates: MAX16928 Ordering Information PART TYPE MAX16928EVKIT# EV Kit #Denotes RoHS compliant. __________________________________________________________________ Maxim Integrated Products   6 MAX16928 Evaluation Kit Evaluates: MAX16928 Revision History REVISION NUMBER REVISION DATE 0 10/11 DESCRIPTION Initial release PAGES CHANGED — 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 ©  2011 Maxim Integrated Products 7 Maxim is a registered trademark of Maxim Integrated Products, Inc.