Evaluates: MAX17112 19-4424 Rev 0 1/09 MAX17112 Evaluation Kit General Description Features The MAX17112 evaluation kit (EV kit) provides a proven 4.5V to 5.5V Input Range design to evaluate the MAX17112 high-performance 15V Output Voltage step-up DC-DC converter, which provides a regulated 1MHz Switching Frequency supply voltage for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). Programmable Soft-Start The EV kit operates from a DC supply voltage of 4.5V to Lead(Pb)-Free and RoHS Compliant 5.5V and is configured to operate with a switching fre- Proven PCB Layout quency of 1MHz. The high switching frequency allows the use of small, surface-mount components. The step- Fully Assembled and Tested up switching regulator is configured for a 15V output and provides 600mA with a 4.5V input. Ordering Information PART TYPE MAX17112EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 3A, 30V Schottky diode (M-Flat) 4.7F 10%, 10V X5R ceramic D1 1 Toshiba CMS03 C1, C2 2 capacitors (0603) TDK C1608X5R1A475K JU1 1 3-pin header 2.7H 20% power inductor (65m, 1F 10%, 6.3V X5R ceramic capacitors (0603) L1 1 3.9A) C3, C9, C10 3 Murata GRM188R60J105K TOKO FDV0630-2R7 (27m, 4.4A) R1 1 0 5% resistor (0603) 0.033F 10%, 25V X7R ceramic R2 1 47k 5% resistor (0603) C4 1 capacitor (0603) Murata GRM188R71E333K R3 1 20k 1% resistor (0603) R4 1 221k 1% resistor (0603) 560pF 5%, 50V C0G ceramic R5 1 10k 5% resistor (0603) C5 1 capacitor (0603) Murata GRM1885C1H561J H i g h- p erfor m ance step - up co nverte r C6 0 Not installed, capacitor U1 1 (10 TDFN-EP*) Maxim MAX17112ETB+ 10F 10%, 25V X5R ceramic C7, C8 2 capacitors (1210) 1 Shunt Murata GRM32DR61E106K 1 PCB: MAX17112 Evaluation Kit+ *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.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 Note: Indicate that you are using the MAX17112 when contacting these component suppliers. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX17112 Evaluation Kit Shutdown Mode (SHDN) Quick Start The EV kit features a shutdown mode that reduces the Recommended Equipment MAX17112 quiescent current. JU1 selects the shut- MAX17112 EV kit down mode. See Table 1 for jumper JU1 functions. 4.5V to 5.5V, 5A DC power supply (VIN) When the shunt of JU1 is placed in the 1-2 position, the SHDN pin is connected to the on-board capacitor One voltmeter (C10). The internal 5A current source of the Procedure MAX17112 charges this capacitor. When the voltage The MAX17112 EV kit is fully assembled and tested. on the SHDN pin rises above 1.24V, the MAX17112 is Follow the steps below to verify board operation. enabled. Caution: Do not turn on power supply or the elec- To shut down the MAX17112, place the shunt of JU1 in tronic load until all connections are completed. the 2-3 position. 1) Verify that a shunt is placed across pins 1-2 of JU1. When JU1 is open, the SHDN pin is controlled by the 2) Connect the positive terminal of the DC power sup- external signal on the SHDN pad. ply to the VIN pad. Connect the negative terminal of Evaluating Other Output Voltages the DC power supply to the GND pad. The MAX17112 EV kits step-up switching-regulator 3) Turn on the 4.5V to 5.5V DC power supply and veri- output (VOUT) is set to 15V by feedback resistors R3 fy that the step-up switching regulator output and R4. To generate output voltages other than 15V, (VOUT) is 15V. select different external voltage-divider resistors, R3 and R4. Select R3 in the 10k to 50k range. R4 is Detailed Description of Hardware then given by the following equation: The MAX17112 evaluation kit (EV kit) provides a proven R4 = R3 x (VOUT/VFB) - 1 design to evaluate the MAX17112 high-performance step-up DC-DC converter, which provides a regulated where VFB = 1.24V. For significantly different operation supply voltage for active-matrix thin-film transistor (TFT) points, the EV kit might require a different inductor and liquid-crystal displays (LCDs). component changes. Refer to the MAX17112 IC data sheet for proper component selection. The EV kit operates from a 4.5V to 5.5V DC power sup- ply. As configured, the step-up switching regulator generates a 15V output (VOUT) and provides 600mA Table 1. Jumper JU1 Functions. with a 4.5V input. The step-up switching regulator out- SHUNT put voltage can be adjusted from VIN to 20V by chang- JUMPER DESCRIPTION POSITION ing the values of the feedback resistors (see the Evaluating Other Output Voltages section). Connects the external shutdown Open The MAX17112 EV kit can operate from a 2.6V to 5.5V signal to the on-board SHDN pad input supply. When input voltage is less than 4.5V, out- JU1 1-2* MAX17112 enabled (VOUT = 15V) put current needs to be reduced from 600mA to avoid Shutdown mode (VOUT = VIN - reaching inductor current limit. Operation at a differ- 2-3 VDIODE) ent input voltage, output voltage, or switching fre- quency may require a different inductor, output *Default position. capacitor, and compensation components. Refer to the MAX17112 IC data sheet for detailed information on loop compensation and component selection. 2 Evaluates: MAX17112