MAX16946EVKIT+

19-5773; Rev 0; 3/11 MAX16946 Evaluation Kit The MAX16946 evaluation kit (EV kit) is an assembled and tested PCB used to evaluate the MAX16946 highvoltage, high-side, current-sense LDO/switch. The EV kit demonstrates the device’s open-drain fault signals (OL, SC), open-load and current-limiting threshold-setting inputs (OLT, LIM), LDO/switch operation and shutdown function (SHDN), as well as the analog voltage output (AOUT). The EV kit comes with a MAX16946GTE/V+ installed, which is the 16-pin TQFN package with an exposed pad. Features S 4.5V to 18V Input Range S Tolerates Inputs Up to 45V S Resistor-Adjustable Open-Load and Current-Limit Threshold S Open-Drain, Open-Load Indicator Output (OL) S Open-Drain, Short-Circuit Indicator Output (SC) S Analog Current-Measurement Output S Proven PCB Layout S Fully Assembled and Tested Ordering Information PART TYPE MAX16946EVKIT# #Denotes RoHS compliant. EV Kit Component List DESIGNATION QTY DESCRIPTION C1 1 22FF Q50V aluminum electrolytic capacitor (8mm x 6.2mm) Panasonic EEETG1H220P C2, C3, C5, C13, C14 5 C4 1 C6, C8 C7 2 1 0.1FF Q10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H104K 1FF Q10%, 25V X7R ceramic capacitor (0805) Murata GRM21BR71E105K 2.2FF Q10%, 25V X7R ceramic capacitors (1206) TDK C3216X7R1E225K 15000pF Q10%, 16V X7R ceramic capacitor (0402) Murata GRM155R71C153K C9 1 4700pF Q10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H472K C10 1 33pF Q5%, 50V C0G ceramic capacitor (0603) Murata GRM1885C1H330J DESIGNATION QTY DESCRIPTION D1 1 50V, 1A Schottky diode (SMA) Diodes Inc. B150-13-F D2 1 Red LED (0805) D3 1 Yellow LED (0805) D4 1 30V, 1A Schottky diode (SOD123) ON Semi MBR130T1G IN, LIM, OLT, OUT, REF, SENS 6 Test points, red JU1 1 5-pin header JU2 1 4-pin header JU3, JU4, JU5, JU6 4 2-pin headers JU7 1 3-pin header L1 1 1mH, 480mA inductor (10.5mm x 10.3mm) Sumida CDRH105RNP-102NC L2, L3 0 Not installed, inductors (1206) P1 1 50I BNC P2 0 Not installed, BNC C11 0 Not installed, ceramic capacitor (1206) Q1 1 C12 1 1FF Q10%, 50V X7R ceramic capacitor (0805) Murata GRM21BR71H105K npn prebiased transistor (3 SOT23) Diodes Inc. DDTC144ECA-7-F R1 R2 1 1 0.5I Q1% resistor (1206) 10I 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. Evaluates: MAX16946 General Description Evaluates: MAX16946 MAX16946 Evaluation Kit Component List (continued) DESIGNATION QTY DESIGNATION QTY R3 R4 R5 R6 R7, R9 R8 1 1 1 1 2 1 33kI Q1% resistor (0603) 86.6kI Q1% resistor (0603) DESCRIPTION SW1 1 Pushbutton switch 30.1kI Q1% resistor (0603) 18.7kI Q1% resistor (0603) U1 1 Current-sense LDO (16 TQFN-EP) Maxim MAX16946GTE/V+ U2 1 General-purpose timer (8 SO) Maxim ICM7555ESA+ R10 1 2.2kI Q5% resistor (0603) R11 1 4.7kI Q5% resistor (0603) U3 1 5V LDO (8 SO-EP) Maxim MAX15006BASA+ R12 R13, R14, R15 R16 1 3 1 10kI Q5% resistor (0603) 100kI Q5% resistors (0603) 62kI Q5% resistor (0603) — 7 Shunts — 1 PCB: MAX16946 EVALUATION KIT 4.7kI Q1% resistors (0603) 33.2kI Q1% resistor (0603) DESCRIPTION Component Suppliers SUPPLIER PHONE WEBSITE Diodes Incorporated 805-446-4800 www.diodes.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com ON Semiconductor 602-244-6600 www.onsemi.com Panasonic Corp. 800-344-2112 www.panasonic.com Sumida Corp. 847-545-6700 www.sumida.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX16946 when contacting these component suppliers. Quick Start • MAX16946 EV kit Required Equipment 3) Adjust the load to 30mA. 4) Connect the power supply between the VIN and GND PCB pads on the EV kit. 5) Connect the load between the REG_OUT and GND PCB pads on the EV kit. • 18V, 200mA DC power supply • Load 6) Connect the first voltmeter between the REG_OUT and GND PCB pads on the EV kit. • Two voltmeters Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on power supply until all connections are completed. 1) Verify that all jumpers are in their default position, as shown in Table 1. 7) Connect the second voltmeter between the AOUT and GND PCB pads on the EV kit. 8) Enable the power supply and the load. 9) Verify that the first voltmeter displays 5V. 10) Verify that the second voltmeter displays 790mV. 2) Adjust the power supply to 10V. 2   _______________________________________________________________________________________ MAX16946 Evaluation Kit JUMPER SHUNT POSITION JU1 JU2 1-2* Connects the FB pin of the device to the resistor-divider of R6 and R7, which sets the output voltage to 5V. JU3 must be installed for proper output. 1-3 Connects the FB pin of the device to the resistor-divider of R8 and R9, which sets the output voltage to 8V. JU4 must be installed for proper output. 1-4 Connects the FB pin of the device to GND, which configures the device as a switch. 1-5 Connects the FB pin of the device to the REG pin of the device, which sets the output voltage to 8.5V. 1-2 Connects the SHDN pin of the device to the input voltage of the device for normal operation. 1-3* Connects the on-board pulse generator to the SHDN pin of the device, which allows the OL output to be cleared. 1-4 JU3 JU4 JU5 1-2* Open 1-2 Open* 1-2* Open 1-2* JU6 DESCRIPTION Open Connects the SHDN pin of the device to ground for shutdown mode. Sets the output voltage to 5V. JU1 must be installed in the 1-2 position for proper output. Disconnects the resistor-divider of R6 and R7 when JU1 is not in the 1-2 position. Sets the output voltage to 8V. JU1 must be installed in the 1-3 position for proper output. Disconnects the resistor-divider of R8 and R9 when JU1 is not in the 1-3 position. Powers U3 by connecting the voltage supply that was applied at the VIN PCB pad on the EV kit. User can apply an external supply to the pin of JU5 that is connected to U3. Connects 5V pullup voltage for OL and SC (LEDs D2 and D3). LEDs D2 and D3 not used. The SC and OL PCB pads of the EV kit are used to monitor fault signals. 1-2 Connects the output pulse of U2 to pin JU2-3. JU2 must be in the 1-3 position for proper operation. 2-3* Connects the output pulse of Q1 to pin JU2-3. JU2 must be in the 1-3 position for proper operation. JU7 *Default position. _______________________________________________________________________________________   3 Evaluates: MAX16946 Table 1. Jumper Descriptions (JU1–JU7) Evaluates: MAX16946 MAX16946 Evaluation Kit Detailed Description of Hardware The MAX16946 EV kit is an assembled and tested PCB used to evaluate the MAX16946 high-voltage, high-side, current-sense LDO/switch. The EV kit operates from a 4.5V to 18V DC supply voltage. The EV kit demonstrates the device’s open-drain fault signals (OL, SC), open-load and current-limiting threshold-setting inputs (OLT, LIM), LDO/switch operation and shutdown function (SHDN), as well as the analog voltage output (AOUT). The EV kit provides LEDs D2 and D3 to facilitate the monitoring of the short-circuit, open-drain and open-load fault signals, respectively. The open-load thresholdsetting input is set to approximately 16mA and the current-limiting threshold is set to approximately 150mA. The short-circuit detection threshold is set by 0.5I (R1) to 100mA. An on-board LDO (U3) is provided to support single-supply evaluation. The LDO is powered by the input voltage (VIN) and provides a 5V output used to power the fault indicator and pulse generator (U2). Open-Drain Fault Signals (OL, SC) The EV kit includes LED D2 to monitor the short-circuit fault signal and D3 to monitor the open-load fault signal. Both LED networks are driven by the on-board 5V LDO (U3). To monitor the indicator outputs by external means, remove the shunt from JU6 and connect the monitor system to the OL and SC PCB pads on the EV kit. Ensure that the monitoring system provides pullup resistors on the OL and SC open-drain indicator output signals. LDO When the shunt of JU1 is in the 1-2 position, the shunt of JU3 is installed, and the shunt of JU4 is not installed, the device is set as a 5V LDO through the resistor-divider of R6 and R7. When the shunt of JU1 is in the 1-3 position, the shunt of JU3 is not installed, and the shunt of JU4 is installed, the device is set as an 8V LDO through the resistor-divider of R8 and R9. To set the output to 8.5V, the shunt of JU1 must be in the 1-5 position, which connects the FB pin to REG. Switch The device is a switch when the shunt of JU1 is in the 1-4 position, which connects the FB pin to ground. The voltage applied at the input is approximately the voltage at the output. Shutdown (SHDN) When the SHDN pin is pulled high, the EV kit is in normal operation. The EV kit can enter shutdown by placing the shunt of JU2 in the 1-4 position. Pulse Generator Once the open load is detected, the OL output latches low and the output voltage stays on. To unlatch the openload indicator (OL back to high), place the shunt of JU2 in the 1-3 position and press the SW1 switch to apply a pulse less than 150Fs at the SHDN pin of the device. Open-Load Threshold The open-load threshold setting is configured by the resistor-divider between the device’s REF and OLT pins and is set to 16mA by default. 4   _______________________________________________________________________________________ MAX16946 Evaluation Kit Evaluates: MAX16946 Figure 1. MAX16946 EV Kit Schematic _______________________________________________________________________________________   5 Evaluates: MAX16946 MAX16946 Evaluation Kit 1.0” 1.0” Figure 2. MAX16946 EV Kit Component Placement Guide— Component Side Figure 3. MAX16946 EV Kit PCB Layout—Component Side 1.0” Figure 4. MAX16946 EV Kit PCB Layout—Inner Layer 2 6   _______________________________________________________________________________________ MAX16946 Evaluation Kit Figure 5. MAX16946 EV Kit PCB Layout—Inner Layer 3 1.0” Figure 6. MAX16946 EV Kit PCB Layout—Solder Side _______________________________________________________________________________________   7 Evaluates: MAX16946 1.0” MAX16946 Evaluation Kit Evaluates: MAX16946 Revision History REVISION NUMBER REVISION DATE 0 3/11 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. 8 ©  2011 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.