19-2901; Rev 0; 7/03 MAX1572 Evaluation Kit Features ♦ 2MHz PWM Switching ♦ 800mA Guaranteed Output Current ♦ Power-Saving Modes: Pulse Group/ Pulse Skip/Forced PWM ♦ Voltage-Positioning Load Transients ♦ 5mVP-P Output Ripple Component List DESIGNATION QTY C1, C2 2 DESCRIPTION 10µF ±20%, 6.3V X5R ceramic capacitors (0805) Panasonic ECJ2FB0J106M or TDK C2012X5R0J106M or Taiyo Yuden JMK212BJ106MG 1 1000pF ±10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H102K or equivalent C4 1 0.1µF ±10%, 16V X7R ceramic capacitor (0603) Taiyo Yuden EMK107BJ104KA or equivalent R1 1 10Ω ±5% resistor (0603) JU1, JU2 2 3-pin headers L1 1 2.2µH inductor, 0.17Ω, 1.2A 3.6mm ✕ 3.6mm ✕ 1.2mm TOKO 976AS-2R2M (D312F family) U1 1 MAX1572ETC150 (12-pin thin QFN 4mm ✕ 4mm) None 2 Shunts, position 2 None 1 MAX1572 EV kit PC board C3 Component Suppliers SUPPLIER PHONE WEBSITE Kamaya 260-489-1533 www.kamaya.com Murata 770-436-1300 www.murata.com Panasonic 714-373-7939 www.panasonic.com Taiyo-Yuden 408-573-4150 www.t-yuden.com TDK 847-803-6100 www.component.tdk.com TOKO 847-297-0070 www.toko.com Note: When contacting these component suppliers, please specify you are using the MAX1572. ♦ Tiny 2.2µH Inductor ♦ 10µF Ceramic Output Capacitor ♦ Low 0.1µA Shutdown Current ♦ Soft-Start with Zero Inrush Current ♦ 170ms (min) RESET Output ♦ Thin QFN IC Package: 4mm ✕ 4mm ✕ 0.8mm ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX1572EVKIT 0°C to +70°C IC PACKAGE 12 Thin QFN-EP* *EP = Exposed paddle. Recommended Equipment • Power supply capable of supplying 500mA from 2.6V to 5.5V • Voltmeter Quick Start Follow the steps below to verify operation of the MAX1572 EV kit. Do not turn on the power supply until all connections are completed: 1) Select the desired operating mode with JU1 and JU2 (see Table 1). 2) Connect the positive terminal of the voltmeter to the pad labeled OUT. Connect the ground terminal of the voltmeter to the pad labeled GND nearest the OUT pad. Connect a load from OUT to the GND pad closest to OUT. 3) Preset the power supply to between 2.6V and 5.5V, and turn the power supply off. 4) Connect the positive power-supply terminal to the pad labeled IN. Connect the power-supply ground to the pad labeled GND nearest the IN pad. 5) Turn on the power supply and verify the output voltage is 1.5V. ________________________________________________________________ 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: MAX1572 General Description The MAX1572 evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX1572 PWM step-down DC-DC converter. The circuit operates from 2.6V to 5.5V and has a fixed 1.5V output capable of delivering 800mA. It also provides a RESET output. The EV kit can be used to evaluate other output voltage versions of the MAX1572 by replacing the IC. Evaluates: MAX1572 MAX1572 Evaluation Kit Evaluating Other Output Voltages Detailed Description The MAX1572 EV kit comes with the 1.5V output version of the MAX1572 installed. To evaluate other voltage versions, replace the IC with the voltage version part to evaluate. MAX1572 output voltages range from 0.75V to 2.5V. Samples of the standard versions are available from Maxim. Refer to the MAX1572 data sheet for ordering information. When evaluating output voltages less than 1.5V, replace C2 with a 22µF ceramic capacitor. Operating Modes The operating mode is selected with JU1 and JU2, as shown in Table 1. For details on each operating mode, refer to the MAX1572 data sheet. RESET Output A connection is provided on the MAX1572 EV kit for evaluating the RESET output of the MAX1572. RESET is an open-drain output with an internal 14kΩ pullup resistor to OUT. Refer to the MAX1572 data sheet for details on the operation of RESET. Table 1. JU1 and JU2 Functions ABATT Filter An RC filter is included on the EV kit to reduce the power-supply noise entering the IC through ABATT. To evaluate the circuit without the filter, short R1 on the PC board and remove C4. JU1 JU2 EN1 PIN EN2 PIN MODE 1-2 1-2 GND GND Shutdown 1-2 2-3 GND IN Pulse group 2-3 1-2 IN GND Pulse skip 2-3 2-3 IN IN Forced PWM IN U1 R1 10Ω C1 10µF C4 0.1µF 9 12 10 3 JU1 2 6 1 3 JU2 2 1 1 11 MAX1572 BATT ABATT LX PGND EN1 OUT EN2 SS RESET GND GND GND 8 L1 2.2µH OUT C2 10µF 7 GND 4 2 3 C3 1000pF 5 EXPOSED PADDLE CONNECTED TO GND RESET Figure 1. MAX1572 EV Kit Schematic 2 _______________________________________________________________________________________ MAX1572 Evaluation Kit Evaluates: MAX1572 Figure 2. MAX1572 EV Kit Component Placement Guide—Top Silkscreen Figure 3. MAX1572 EV Kit PC Board Layout—Component Side Figure 4. MAX1572 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. 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