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| 19-2050; Rev 0; 5/01 MAX1776 Evaluation Kit General Description The MAX1776 evaluation kit (EV kit) provides a +5.0V output voltage from a +5.5V to +24V input source. It delivers 500mA output current and operates up to 100% duty cycle at dropout. The MAX1776 is a stepdown switching regulator with an internal power switch. The EV kit is a fully assembled and tested surfacemount PC board. It can also be used to evaluate other output voltages in the +1.25V to +23.5V range by adding the feedback resistors and changing a jumper setting. o +5.5V to +24V Input Voltage Range (for Fixed +5V Output) o +4.5V to +24V Input Voltage Range (for +3.3V Output) o Output Voltage Fixed +5V Adjustable Output (+1.25V to +23.5V) o 500mA Output Current o 3A IC Shutdown Mode o 8-Pin MAX Package o Surface-Mount Construction o Fully Assembled and Tested Features Evaluates: MAX1776 Component List DESIGNATION QTY DESCRIPTION 10F 10%, 25V, X5R ceramic capacitor (1812) Taiyo Yuden TMK432BJ106KM or TDK C4532X5R1E106M 100F, 6.3V, 45m low-ESR electrolytic capacitor (POSCAP) (D2) Sanyo 6TPC100M 1A, 30V Schottky diode Nihon EP10QY03 10H inductor Sumida CDRH6D28-100NC Not installed (0603) Not installed, pads shorted with PC 3-pin headers Not installed, pins 1 and 2 shorted with PC trace MAX1776EUA (8-pin MAX) Shunts MAX1776 PC board MAX1776 EV kit data sheet MAX1776 data sheet PART MAX1776EVKIT Ordering Information TEMP. RANGE -40C to +85C IC PACKAGE 8 MAX C1 1 C2 1 Component Suppliers SUPPLIER Nihon Sanyo Sumida Taiyo Yuden TDK PHONE 847-843-7500 619-661-6835 847-956-0666 408-573-4150 847-390-4373 FAX 847-843-2798 619-661-1055 847-956-0702 408-573-4159 847-390-4428 D1 L1 R1 R2 JU1, JU4 JU2, JU3 U1 None None None None 1 1 0 0 2 0 1 2 1 1 1 Note: Please indicate that you are using the MAX1776 when contacting these component 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. MAX1776 Evaluation Kit Evaluates: MAX1776 Quick Start The MAX1776 EV kit is a fully assembled and tested surface-mount board. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed. 1) Verify that shunts are across pins 1 and 2 of jumper JU1 (SHDN) and pins 1 and 2 of jumper JU4. 2) Connect a voltmeter and load (if any) to the VOUT pad. Connect the ground to the GND pad closest to VOUT. 3) Connect a +5.5V to +24V power supply to the VIN pad. Connect the power-supply ground to the GND pad closest to VIN. 4) Turn on the power supply, and verify that the output voltage is +5.0V. To evaluate other output voltages, refer to Evaluating Other Output Voltages kit's default setting provides the maximum 1.2A switch current limit. To change the switch current limit, cut open the PC board traces, shorting pins 1 and 2 of JU2 and JU3, and short the appropriate pins for the desired current limit (Table 2). Changing the current limit requires inductor L1 and output capacitor C2 to be replaced. Refer to the Recommended Components Table (Table 3) of the MAX1776 data sheet. Evaluating Other Output Voltages The default output for the MAX1776 EV kit is +5.0V. To generate output voltages other than +5.0V, set the JU4 shunt to pins 2 and 3 (Table 3), cut the PC board trace shorting the pads of R2, and install feedback resistors R1 and R2. Select feedback resistor R2 in the 10k to 100k range. R1 = R2 [(VOUT / 1.25V) - 1] Detailed Description Shutdown Jumper Selection The MAX1776 EV kit features a shutdown mode that reduces quiescent current to 3A (typ) to preserve battery life. Jumper (JU1) options select the circuit operating modes: shutdown or normal mode (Table 1). Table 2. Jumper JU2 and JU3 Functions JU2 SHUNT LOCATION 2 and 3 1 and 2 2 and 3 1 and 2* JU3 SHUNT LOCATION 2 and 3 2 and 3 1 and 2 1 and 2* MAX1776 SWITCH CURRENT LIMIT (A) 0.15 0.30 0.60 1.20 Adjustable Current Limit The MAX1776 EV kit can operate at different current limits after modification. Jumper (JU2 and JU3) options select the MAX1776 internal switch current limit. The EV *Default configuration: JU2 (1-2), JU3 (1-2) shorted by PC board trace. Table 1. Jumper JU1 Functions SHUNT LOCATION 1 and 2 2 and 3 SHDN PIN Connected to VIN Connected to GND Connect external source to SHDN pad MAX1776 OUTPUT MAX1776 enabled, VOUT = +5.0V Shutdown mode, VOUT = 0V MAX1776 output depends on external SHDN signal Table 3. Jumper JU4 Functions SHUNT LOCATION 1 and 2 2 and 3 JUMPER CONNECTION Connected to OUT Connected to a voltage-divider MAX1776 OUTPUT Fixed output, VOUT = +5.0V Adjustable output None Note: Do not switch JU4 shunt location or leave JU4 floating (no shunt across JU4) when power is on. 2 _______________________________________________________________________________________ MAX1776 Evaluation Kit Evaluates: MAX1776 VIN C1 10F 25V 5 1 2 3 IN OUT 8 1 2 JU4 C2 100F 6.3V VOUT GND JU3 3 ILIM U1 MAX1776 3 R1 OPEN FB 1 R2 SHORT (PC TRACE) LX 4 D1 GND 2 L1 10H GND 1 2 3 JU2 6 ILIM2 SHDN 1 2 3 JU1 7 SHDN Figure 1. MAX1776 EV Kit Schematic _______________________________________________________________________________________ 3 MAX1776 Evaluation Kit Evaluates: MAX1776 1.0" Figure 2. MAX1776 EV Kit Component Placement Guide-- Component Side 1.0" Figure 3. MAX1776 EV Kit PC Board Layout--Component Side 1.0" Figure 4. MAX1776 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. 4 _____________________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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