19-2341; Rev 0; 2/02 MAX1819 Evaluation Kit Features ♦ 2.5V to 5.5V Input Voltage Range 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. ♦ Output Voltage 1.8V Fixed Output Voltage (MAX1819EBL18) 1.25V to 5.0V Adjustable Output Voltage (External Divider) ♦ Up to 500mA Output Current ♦ Power-OK Output ♦ 6-Bump UCSP Package Component List DESIGNATION C1 QTY 1 ♦ Surface-Mount Construction ♦ Fully Assembled and Tested DESCRIPTION 1µF ±10%, 10V X7R ceramic capacitor (0805) Taiyo Yuden LMK212BJ105KG or Murata GRM40X7R105K010AD Ordering Information PART MAX1819EVKIT TEMP RANGE 0°C to +70°C IC PACKAGE 6 UCSP C2 1 4.7µF ±20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ475MG or TDK C2012X5R0J475M JU1 1 3-pin header R1 0 Not installed (0603) The MAX1819 EV kit is fully assembled and tested. Follow these steps to verify board operation. R2 0 Not installed, pads shorted with PC trace (0603) Do not turn on the power supply until all connections are completed: R3 1 100kΩ ±5% resistor (0603) U1 1 MAX1819EBL18 (6-bump UCSP) Top mark AAG 1) Verify that the shunt is across pins 1 and 2 of jumper JU1 (SHDN) (Table 1). None 1 Shunt None 1 MAX1819 PC board None 1 MAX1819EVKIT data sheet None 1 MAX1819 data sheet Note: To evaluate the MAX1819EBL15/20/25/33/50, use external feedback resistors. Quick Start 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. Component Suppliers SUPPLIER PHONE FAX Murata 770-436-1300 770-436-3030 www.murata.com Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com 847-803-6100 847-390-4405 www.component.tdk.com TDK WEBSITE Note: Please indicate that you are using the MAX1819 when contacting these component suppliers. ________________________________________________________________ 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: MAX1819EBL18 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. Evaluates: MAX1819EBL18 MAX1819 Evaluation Kit Detailed Description Table 1. Jumper JU1 Functions 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. SHDN PIN SHUNT LOCATION The MAX1819 EV kit features a shutdown mode that reduces quiescent current to 0.1µA (typ) to preserve the battery life. MAX1819 OUTPUT 1 and 2 Connected to VIN MAX1819 enabled, VOUT = 1.8V 2 and 3 Connected to GND Shutdown mode, VOUT = 0V None Connected to an external source through SHDN pad MAX1819 output depends on external SHDN signal levels 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 25kΩ to 100kΩ range, then R1 is given by: VOUT = VSET (1 + R1 / R2) R1 = R2 [(VOUT / VSET) - 1] where VSET = 1.25V. R3 100kΩ POK A2 POK OUT VOUT 1.8V C1 C2 4.7µF 6.3V U1 MAX1819EBL18 R1 OPEN VIN 2.5V TO 5.5V GND GND A1 IN SET C2 C1 1.0µF 10V R2 SHORT (PC TRACE) 1 SHDN 2 3 JU1 A3 SHDN GND C3 Figure 1. MAX1819 EV Kit Schematic 2 _______________________________________________________________________________________ MAX1819 Evaluation Kit 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX1819EBL18 Figure 2. MAX1819 EV Kit Component Placement Guide— Component Side