19-2052; Rev 0; 5/01 MAX1818 Evaluation Kit Features ♦ +2.5V to +5.5V Input Voltage Range The EV kit is a fully assembled and tested surfacemount PC board. It can also evaluate other preset voltages and other output voltages in the +1.25V to +5.0V range by using external resistors. ♦ Output Voltage +1.8V Fixed Output Voltage (MAX1818EUT18) +1.25 to +5.0V Adjustable Output Voltage (External Divider) ♦ Up to 500mA Output Current ♦ Power-OK Output ♦ 6-Pin SOT23 Package Component List DESIGNATION QTY C1 1 1µF ±10%, 10V X7R ceramic capacitor (0805) Taiyo Yuden LMK212BJ105KG C2 1 4.7µF ±20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ475MG or TDK C2012X5R0J475M R1 0 Not installed (0603) R2 0 Not installed, pads shorted with PC trace (0603) R3 1 100kΩ ±5% resistor (0603) ♦ Surface-Mount Construction ♦ Fully Assembled and Tested DESCRIPTION U1 1 MAX1818EUT18 (6-pin SOT23) JU1 1 3-pin header None 1 Shunt None 1 MAX1818 PC board None 1 MAX1818 EV kit data sheet None 1 MAX1818 data sheet Ordering Information PART MAX1818EVKIT TEMP. RANGE 0°C to +70°C IC-PACKAGE 6 SOT23 Note: To evaluate the MAX1818EUT15, /20, /25, /33, or /50, request a MAX1818EUT15, /20, /25, /33, or /50 free sample with the MAX1818 EV kit. Refer to soldering information in Absolute Maximum Rating section of MAX1818 data sheet for mass production solder reflow advice. Quick Start The MAX1818 EV Kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Verify that the shunt is across pins 1 and 2 of jumper JU1 (SHDN) (Table 1). 2) Connect a voltmeter to the VOUT pad. Connect the ground to the GND pad closest to VOUT. Component Suppliers SUPPLIER PHONE FAX Taiyo Yuden 408-573-4150 408-573-4159 TDK 847-390-4373 847-390-4428 Note: Please indicate that you are using the MAX1818 when contacting these component suppliers. 3) Connect a +2.5V to +5.5V supply to the VIN pad. Connect the supply ground to the GND pad closest to VIN. 4) Turn on the power supply, and verify that the output is the preset voltage: +1.8V. To evaluate other voltages, refer to Evaluating Other Output Voltages. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX1818EUT15/18/20/25/33/50 General Description The MAX1818 linear regulator evaluation kit (EV kit) provides a regulated +1.8V output voltage from a +2.5V to +5.5V input source. It delivers up to 500mA output current. Evaluates: MAX1818EUT15/18/20/25/33/50 MAX1818 Evaluation Kit Detailed Description The MAX1818 EV kit contains a low-dropout, linear regulator circuit, which provides a +1.8V output from a +2.5V to +5.5V input voltage. The EV kit provides up to 500mA output current. Power-OK will provide a logical low output when the output voltage falls below 93% of its nominal voltage. Table 1. Jumper JU1 Functions The MAX1818 EV kit features a shutdown mode that reduces quiescent current to 0.1µA (typ) to preserve the battery life. Evaluating Other Output Voltages The output voltage of the MAX1818 EV kit is preset to +1.8V. To generate an output voltage other than the preset output voltage, cut open the PC trace shorting R2, and install feedback resistors R1 and R2. Select R2 in the 25kΩ to 100kΩ range. VOUT = VSET (1 + R1 / R2) R1 = R2 [(VOUT / VSET) - 1] SHDN PIN SHUNT LOCATION MAX1818 OUTPUT 1 and 2 Connected to VIN MAX1818 enabled, VOUT = +1.8V 2 and 3 Connected to GND Shutdown mode, VOUT = 0V None Connected external source to SHDN pad MAX1818 output depends on external SHDN signal Table 2. MAX1818 EV Kit Corresponding Output Voltage where VSET = 1.25V. The MAX1818 EV kit can also be used to evaluate the MAX1818EUT15, /20, /25, /33, or /50. Replace MAX1818EUT18 with a MAX1818EUT15, /20, /25, /33, or /50. Hand soldering for single unit evaluation on the EV kit is acceptable. Table 2 lists the corresponding output voltage. MAX1818 PART AND SUFFIX MAX1818 EV KIT FIXED OUTPUT VOLTAGE MAX1818EUT15 +1.5V MAX1818EUT18 +1.8V MAX1818EUT20 +2.0V MAX1818EUT25 +2.5V MAX1818EUT33 +3.3V MAX1818EUT50 +5.0V R3 100kΩ 5% POK 2 POK OUT VOUT +1.8V 6 C2 4.7µF 6.3V U1 MAX1818EUT18 R1 OPEN VIN +2.5V TO +5.5V GND GND 1 IN SET 5 C1 1.0µF 10V R2 SHORT 1 SHDN 2 3 JU1 3 SHDN GND 4 Figure 1. MAX1818 EV Kit Schematic 2 _______________________________________________________________________________________ MAX1818 Evaluation Kit 1.0" Figure 2. MAX1818 EV Kit Component Placement Guide— Component Side 1.0" Figure 3. MAX1818 EV Kit PC Board Layout—Component Side 1.0" Figure 4. MAX1818 EV Kit PC Board Layout—Solder Side Figure 5. MAX1818 EV Kit Component Placement Guide— 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. 3 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX1818EUT15/18/20/25/33/50 1.0"