Evaluates: MAX8516/MAX8517/MAX8518 19-4261 Rev 0 8/08 MAX8517 Evaluation Kit General Description Features The MAX8517 evaluation kit (EV kit) is a fully assembled 1.425V to 3.6V Input-Voltage Range and tested surface-mount PCB demonstrating the 1.2V Output Voltage MAX8517 low-dropout (LDO) regulator. The EV kit comes assembled with a MAX8517EUB+ circuit that Up to 1.6A Output Current (Limited by Power steps down a 1.425V to 3.6V input-voltage range to a Dissipation and Dropout) 1.2V output capable of sourcing up to 1A of continuous Low-Dropout Voltage (200mV max at 1A) output current, with a maximum dropout voltage of only 200mV. The MAX8517 features a POK output that goes Power-OK (POK) Output (MAX8517 only) high impedance once the output is within 10% of its Power-On Reset (POR) Output (MAX8518 only) regulation value. Other features of the EV kit include a logic-controlled shutdown mode (EN) and adjustable Fully Assembled and Tested output voltage through feedback resistors R1 and R2. The EV kit can also be used to evaluate the MAX8518, which features a POR output that goes high impedance 150ms (typ) after the output has risen above 90% of its final value. Both the POK and POR features require an Ordering Information external pullup resistor to IN. See the Detailed Description of Hardware section for more details. To PART TYPE evaluate the MAX8516, remove R4 and install a MAX8516 IC. MAX8517EVKIT+ EV Kit Although the EV kit is optimized for 1A output current, +Denotes lead-free and RoHS compliant. the part is capable of supporting up to 1.6A output cur- rent (limited by power dissipation and dropout). Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION R1 1 698 1% resistor (0603) 1F 10%, 6.3V X5R ceramic capacitor (0603) R2 1 499 1% resistor (0603) C1 1 TDK C1608X5R0J105K R3 1 Not installed, resistor (0603) Murata GRM188R60J105K R4 1 100k 5% resistor (0603) 4.7F 10%, 16V X7R ceramic LDO regulator (10 MAX ) capacitor (1206) U1 1 C2 1 Maxim MAX8517EUB+ TDK C3216X7R1C475K 1 Shunts Murata GRM31CR71C475K 1 PCB: MAX8517 Evaluation Kit+ JU1 1 3-pin header 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 Note: Indicate that you are using the MAX8516, MAX8517, or MAX8518 when contacting these component suppliers. MAX is a registered trademark of Maxim Integrated Products, Inc. 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.MAX8517 Evaluation Kit where V is 0.5V. Choose R2 < 1k to optimize quies- FB Quick Start cent current, accuracy, and high-frequency power-sup- Recommended Equipment ply rejection. To simplify resistor selection: Before beginning, the following equipment is needed: One 4V, 1A variable-output power supply V OUT RR12= 1 Dummy load capable of sinking 1A V FB Digital multimeter (DMM) Table 1. Jumper JU1 Functions Procedure The MAX8517 EV kit is fully assembled and tested. SHUNT POSITION EN PIN MODE Follow the steps below to verify board operation. 1-2* Connected to IN Normal operation Caution: Do not turn on power supplies until all con- 2-3 Connected to GND Shutdown mode nections are completed. *Default position. 1) Preset the power supply to 1.425V and turn off the power supply. Shutdown Mode 2) Verify that a shunt is across pins 1-2 of JU1 to The MAX8517 EV kit features 3-pin jumper JU1 to con- enable the device. trol the enable (EN) input. For normal operation, con- 3) Connect the positive lead of the power supply to nect EN to IN by placing a shunt across pins 1-2. To the VIN pad on the EV kit, and the negative lead of shut down the device, pull EN to GND by placing a the power supply to the GND pad on the EV kit. shunt across pins 2-3. During shutdown, an internal 10k resistor pulls down the output. 4) Connect the positive input of the DMM to the VOUT pad on the EV kit, and the negative input of the Power-OK (POK) (MAX8517 Only) DMM to the GND pad on the EV kit to measure the The MAX8517 EV kit features a power-OK (POK) output output voltage. to indicate the status of the output. The 100k pullup 5) Turn on the power supply and verify that the output resistor (R4) pulls POK high when the regulator output voltage is 1.2V 1.4%. is within 10% of its nominal output voltage. If the out- put voltage falls or rises outside this range, POK transi- 6) Sweep the input voltage from 1.425V to 3.6V. Verify tions low. that the output voltage is 1.2V 1.4% over the entire input range. Power-On Reset (POR) (MAX8518 Only) 7) Set the power supply to 2V. The EV kit can also evaluate the MAX8518 IC, which features a power-on-reset output that transitions high 8) Connect the 1A load between the VOUT and GND 150ms (typ) after the output has risen above 90% of its pads on the EV kit. final value. If the part is in shutdown mode, falls below 9) Verify that the output voltage is 1.2V 1.4%. 90% of the nominal output voltage, or experiences a short-circuit/thermal fault, POR immediately transitions Detailed Description of Hardware low. This open-drain output requires an external pullup Output Voltage Selection resistor to IN. Connect POR to IN by installing a 100k The MAX8516/MAX8517/MAX8518 feature an pullup resistor (R3). adjustable output voltage from 0.5V to 3.4V, using two external resistors connected as a voltage-divider to FB, as shown in Figure 1. The output voltage is set by the following equation: R1 VV=+1 OUT FB R2 2 Evaluates: MAX8516/MAX8517/MAX8518