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| 19-2341; Rev 0; 2/02 MAX1819 Evaluation Kit General Description The MAX1819 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 surface-mount PC board. It can also evaluate 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 (MAX1819EBL18) 1.25V to 5.0V Adjustable Output Voltage (External Divider) o Power-OK Output o 6-Bump UCSP Package o Surface-Mount Construction o Fully Assembled and Tested Features Evaluates: MAX1819EBL18 Component List DESIGNATION QTY DESCRIPTION 1F 10%, 10V X7R ceramic capacitor (0805) Taiyo Yuden LMK212BJ105KG or Murata GRM40X7R105K010AD 4.7F 20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ475MG or TDK C2012X5R0J475M 3-pin header Not installed (0603) Not installed, pads shorted with PC trace (0603) 100k 5% resistor (0603) MAX1819EBL18 (6-bump UCSP) Top mark AAG Shunt MAX1819 PC board MAX1819EVKIT data sheet MAX1819 data sheet Ordering Information PART MAX1819EVKIT TEMP RANGE 0C to +70C IC PACKAGE 6 UCSP C1 1 C2 1 Note: To evaluate the MAX1819EBL15/20/25/33/50, use external feedback resistors. Quick Start The MAX1819 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. 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 of 1.8V. To evaluate other voltages, see the Evaluating Other Output Voltages section. JU1 R1 R2 R3 U1 None None None None 1 0 0 1 1 1 1 1 1 Component Suppliers SUPPLIER Murata Taiyo Yuden TDK PHONE 770-436-1300 800-348-2496 847-803-6100 FAX 770-436-3030 847-925-0899 847-390-4405 WEBSITE www.murata.com www.t-yuden.com www.component.tdk.com Note: Please indicate that you are using the MAX1819 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. MAX1819 Evaluation Kit Evaluates: MAX1819EBL18 Detailed Description The MAX1819 EV kit contains a low-dropout, linearregulator 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 MAX1819 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 to an external source through SHDN pad MAX1819 OUTPUT MAX1819 enabled, VOUT = 1.8V Shutdown mode, VOUT = 0V MAX1819 output depends on external SHDN signal levels None Evaluating Other Output Voltages The output voltage of the MAX1819 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, then R1 is given by: VOUT = VSET (1 + R1 / R2) R1 = R2 [(VOUT / VSET) - 1] where VSET = 1.25V. R3 100k POK A2 POK U1 MAX1819EBL18 OUT C1 C2 4.7F 6.3V R1 OPEN VOUT 1.8V GND VIN 2.5V TO 5.5V C1 1.0F 10V A1 IN SET C2 R2 SHORT (PC TRACE) GND 1 SHDN 2 3 JU1 A3 C3 SHDN GND Figure 1. MAX1819 EV Kit Schematic 2 _______________________________________________________________________________________ MAX1819 Evaluation Kit Evaluates: MAX1819EBL18 Figure 2. MAX1819 EV Kit Component Placement Guide-- Component Side Figure 3. MAX1819 EV Kit PC Board Layout--Component Side Figure 4. MAX1819 EV Kit PC Board Layout--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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 3 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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