MAX889S JMK316BJ106ML GRM42-6X5R106K6 LMK212BJ225MG MAX889SEVKIT MAX889SESA

MAX889S Evaluation Kit Features o +2.7V to +5.5V Input Range o Uses One 2.2µF and Two 10µF Ceramic Capacitors o

19-1861; Rev 0; 11/00 MAX889S MAX889S Evaluation Kit Features o +2.7V to +5.5V Input Range o Uses One 2.2µF and Two 10µF Ceramic Capacitors o Output Adjustable from -2.5V to -VIN o 200mA Output Current o 1MHz Switching Frequency o Fully Assembled and Tested Surface-Mount Board Component List DESIGNATION QTY DESCRIPTION 2 C2 1 JU1 1 3-pin jumper PART TEMP. RANGE IC PACKAGE 10µF, 6.3V X5R ceramic capacitors Taiyo Yuden JMK316BJ106ML JMK316BJ106ML Murata GRM42-6X5R106K6 GRM42-6X5R106K6.3 2.2µF, 10V X5R ceramic capacitor Taiyo Yuden LMK212BJ225MG LMK212BJ225MG Ordering Information MAX889SEVKIT MAX889SEVKIT C1, C3 0°C to +70°C 8 SO Quick Start The MAX889S MAX889S EV kit is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed: JU2, JU3 2 2-pin jumpers R1 1 49.9k ±1% resistor R2 1 33.2k ±1% resistor U1 1 MAX889SESA MAX889SESA None 1 MAX889S MAX889S EV kit data sheet 3) Connect a +5.0V supply to the pad labeled VIN. Connect the ground lead to the pad labeled GND. None 1 MAX889 MAX889 IC data sheet 4) Turn on the power and verify that the output is 3.3V. None 3 Shunts 1) Connect a voltmeter and the load to the VOUT pad. 2) Place the shunts in the following positions: JU1 1-2, JU2 closed, JU3 closed. Component Suppliers PHONE FAX Murata SUPPLIER 814-237-1431 814-238-0490 Taiyo Yuden 408-573-4150 408-573-4159 Note: Please indicate that you are using the MAX889S MAX889S when contacting these suppliers. _ Maxim Integrated Products 1 For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. Evaluates: MAX889 MAX889 General Description The MAX889 MAX889 IC is an inverting charge pump that delivers a regulated negative output voltage at loads up to 200mA. The device operates from an input of +2.7V to +5.5V to produce a user-adjustable, regulated output of -2.5V to -VIN. The MAX889S MAX889S evaluation kit (EV kit) is a fully assembled and tested surface-mount board. The board is set up to provide a -3.3V output from a +5.0V input supply. The EV kit is shipped with a MAX889S MAX889S (1MHz switching frequency) installed. The board may also be used to evaluate the MAX889R MAX889R (500kHz) or the MAX889T MAX889T (2MHz). To do so, request a free sample of the MAX889RESA MAX889RESA or MAX889TESA MAX889TESA, and refer to the MAX889 MAX889 data sheet for the appropriate capacitor values. Evaluates: MAX889 MAX889 MAX889S MAX889S Evaluation Kit Detailed Description Capacitor Selection Jumper Selection Use capacitors with a low effective series resistance (ESR), such as ceramic or surface-mount chip tantalum types. Refer to the MAX889 MAX889 data sheet for more information. The MAX889 MAX889 can be placed in shutdown mode, using jumper JU1. See Table 1 for jumper settings. Jumper JU2 connects VIN to the voltage-divider that sets the output voltage. To use a voltage source other than VIN as the reference, open JU2, and connect the reference source to the pad labeled VREF. Table 1. Jumper Functions JUMPER JUMPER POSITION 1-2* The MAX889 MAX889 can be placed into free-run mode (unregulated, VOUT = -VIN) by removing the shunt on JU3 and installing a shunt on JU2. SHDN = High, MAX889 MAX889 enabled 2-3 SHDN = Low, MAX889 MAX889 disabled JU1 Output Voltage Adjustment Open Drive SHDN pad with an external signal Open The MAX889S MAX889S EV kit is shipped with the resistor-divider selected for an output of -3.3V and an input of +5.0V. Output voltages other than -3.3V can be set one of two ways: 1) Change the resistor-divider formed by R1 and R2. Use the following equation to determine the resistor values: Drive VREF pad with an external voltage to set the output voltage JU2 Closed* VIN is used to set the output voltage Open Used to place the MAX889 MAX889 into free-run mode (JU2 must be closed) R2 = -(VOUT / VREF) R1 (The current through R1 and R2 should be at least 30µA.) JU3 2) Remove the shunt from JU2 and apply a voltage to the VREF pad. Use the following equation to determine the voltage for VREF: VREF = -(R1 / R2) VOUT FUNCTION Closed* Output voltage is set by resistor-divider and VIN or VREF *Default position JU2 VREF VIN C1 10µF GND + R1 49.9k 1% 1 SHDN 1 JU1 2 6 IN SHDN FB 7 U1 3 2 R2 33.2k 1% MAX889S MAX889S CAP+ C2 + 2.2µF JU3 4 CAPAGND 8 OUT GND 3 5 VOUT + C3 10µF GND Figure 1. MAX889S MAX889S EV Kit Schematic Diagram 2 _ MAX889S MAX889S Evaluation Kit Figure 2. MAX889S MAX889S EV Kit Component Placement Guide- Component Side Figure 3. MAX889S MAX889S EV Kit PC Board Layout-Component Side Board dimensions: 2.4in by 1.4in Figure 4. MAX889S MAX889S 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 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX889 MAX889 Board dimensions: 2.4in by 1.4in Board dimensions: 2.4in by 1.4in