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| 19-2052; Rev 0; 5/01 MAX1818 Evaluation Kit 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. 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. o +2.5V to +5.5V Input Voltage Range o Up to 500mA Output Current o Output Voltage +1.8V Fixed Output Voltage (MAX1818EUT18) +1.25 to +5.0V Adjustable Output Voltage (External Divider) o Power-OK Output o 6-Pin SOT23 Package o Surface-Mount Construction o Fully Assembled and Tested Features Evaluates: MAX1818EUT15/18/20/25/33/50 Component List DESIGNATION C1 QTY 1 DESCRIPTION 1F 10%, 10V X7R ceramic capacitor (0805) Taiyo Yuden LMK212BJ105KG 4.7F 20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ475MG or TDK C2012X5R0J475M Not installed (0603) Not installed, pads shorted with PC trace (0603) 100k 5% resistor (0603) MAX1818EUT18 (6-pin SOT23) 3-pin header Shunt MAX1818 PC board MAX1818 EV kit data sheet MAX1818 data sheet Ordering Information PART MAX1818EVKIT TEMP. RANGE 0C to +70C IC-PACKAGE 6 SOT23 C2 1 R1 R2 R3 U1 JU1 None None None None 0 0 1 1 1 1 1 1 1 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 Taiyo Yuden TDK PHONE 408-573-4150 847-390-4373 FAX 408-573-4159 847-390-4428 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. Note: Please indicate that you are using the MAX1818 when contacting these component suppliers. ________________________________________________________________ Maxim Integrated Products 1 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. MAX1818 Evaluation Kit Evaluates: MAX1818EUT15/18/20/25/33/50 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. The MAX1818 EV kit features a shutdown mode that reduces quiescent current to 0.1A (typ) to preserve the battery life. Table 1. Jumper JU1 Functions SHUNT LOCATION 1 and 2 2 and 3 SHDN PIN Connected to VIN Connected to GND Connected external source to SHDN pad MAX1818 OUTPUT MAX1818 enabled, VOUT = +1.8V Shutdown mode, VOUT = 0V MAX1818 output depends on external SHDN signal 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 25k to 100k range. VOUT = VSET (1 + R1 / R2) R1 = R2 [(VOUT / VSET) - 1] 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. None Table 2. MAX1818 EV Kit Corresponding Output Voltage MAX1818 PART AND SUFFIX MAX1818EUT15 MAX1818EUT18 MAX1818EUT20 MAX1818EUT25 MAX1818EUT33 MAX1818EUT50 MAX1818 EV KIT FIXED OUTPUT VOLTAGE +1.5V +1.8V +2.0V +2.5V +3.3V +5.0V R3 100k 5% POK 2 POK U1 MAX1818EUT18 OUT 6 C2 4.7F 6.3V R1 OPEN VOUT +1.8V GND VIN +2.5V TO +5.5V C1 1.0F 10V 1 IN SET 5 R2 SHORT GND 1 SHDN 2 3 JU1 3 4 SHDN GND Figure 1. MAX1818 EV Kit Schematic 2 _______________________________________________________________________________________ MAX1818 Evaluation Kit Evaluates: MAX1818EUT15/18/20/25/33/50 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 1.0" 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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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