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| 19-1968; Rev 0; 3/01 MAX1837 Evaluation Kit General Description The MAX1837 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that demonstrates the performance of the MAX1837 step-down DC-DC converter. The EV kit provides a +3.3V output from a +4.5V to +24.0V input and can deliver up to 250mA of load current. The EV kit circuit includes the MAX1837EUT33 DC-DC converter, which is preset to regulate the output voltage to +3.3V but can be reconfigured to output voltages in the +1.25V to +5.5V range. This EV kit can also be used to evaluate other preset voltage parts in the MAX1836/ MAX1837 family. o Preset +3.3V Output Voltage o 250mA Output Current o +4.5V to +24.0V Input Voltage Range o Adjustable Output Voltages (+1.25 to +5.5V) o Low 12A (typ) Quiescent Supply Current o Surface-Mount Construction o Fully Assembled and Tested Evaluates: MAX1836/MAX1837 Features Component List DESIGNATION QTY DESCRIPTION 10F, 25V X5R ceramic capacitor (1812) Taiyo Yuden TMK432BJ106MM or TDK C4532X7R1E106KT 150F, 6.3V low-ESR capacitor (D3) Sanyo 6TPB150M Not installed (0805) 0.5A, 30V Schottky diode (SOD-123) Nihon EP05Q03L 22H, 0.8A inductor Sumida CDRH5D18-220 Not installed, resistors (0805) MAX1837EUT33 (6-pin SOT23) Top mark: AANZ 3-pin header Shunt MAX1837 PC board MAX1836/MAX1837 data sheet MAX1837 EV kit data sheet PART MAX1837EVKIT Ordering Information TEMP. RANGE 0C to +70C IC PACKAGE 6 SOT23 C1 1 Component Suppliers SUPPLIER Nihon Sanyo Sumida Taiyo Yuden TDK PHONE 661-867-2555 619-661-6835 847-956-0666 408-573-4150 847-803-6100 FAX 661-867-2698 619-661-1055 847-956-0702 408-573-4159 847-803-6296 C2 C3 D1 1 0 1 L1 R1, R2 U1 JU1 None None None None 1 0 1 1 1 1 1 1 Note: Please indicate that you are using the MAX1836/ MAX1837 when contacting these component suppliers. Quick Start The MAX1837 EV kit is a fully assembled and tested surface-mount board. Follow the steps below for board operation. Do not turn on the power supply until all connections are completed: 1) Verify that a shunt is connected across pins 1 and 2 of jumper JU1. 2) Connect a voltmeter across the VOUT and GND pads to monitor output voltage. 3) Connect a +4.5V to +24.0V supply to the VIN pad. Connect the ground terminal to the GND pad. 4) Turn on the power supply and verify that the output voltage is +3.3V. ________________________________________________________________ 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. MAX1837 Evaluation Kit Evaluates: MAX1836/MAX1837 Detailed Description The MAX1837 EV kit provides a +3.3V output from a +4.5V to +24.0V input. The EV kit delivers up to 250mA and operates up to 100% duty cycle for low dropout voltage. The MAX1837 features a low-current (12A typ) quiescent supply current as well as a low-current (3A typ) shutdown mode. The EV kit utilizes the MAX1837EUT33 IC, and the circuit regulates the output voltage to +3.3V without an external feedback network. The output can be adjusted for voltages in the +1.25V to +5.5V range by adding feedback resistors R1 and R2. For instructions on adjusting the output voltage, see the Output Voltages section. Other versions of the MAX1836/MAX1837, with different preset voltages and different maximum currents loads, can also be evaluated on this board. For instructions on how to evaluate other converters using this EV kit board, see the Evaluating Other Converters section. Evaluating Other Converters The MAX1837 EV kit circuit board has a MAX1837EUT33 IC preinstalled. To evaluate other converters on the MAX1837 EV kit board, replace MAX1837EUT33 IC with an alternate part (Table 2). To evaluate the alternate part at its preset output voltage, verify that the FB pin is connected to ground (R2 shorted) and that the OUT pin is connected to VOUT (JU2 shorted). Refer to the Inductor Selection and Output Capacitor section of the MAX1836/MAX1837 data sheet to verify or resize the inductor and capacitor values for the application. Table 1. Jumper JU1 Function Table SHUNT LOCATION 1 and 2 SHDN PIN Connected to VIN Connected to GND EV KIT OPERATION U1 enabled, VOUT = +3.3V Shutdown mode, VOUT = 0 Output Voltages The MAX1837 EV kit circuit is configured to regulate to the +3.3V output voltage by connecting the MAX1837EUT33 FB pin to ground. The output can be adjusted to a different voltage (+1.25V to +5.5V) by cutting open the PC board short at JU2, the short located at R2, and installing resistors R1 and R2. Refer to the Output Voltage Selection section of the MAX1836/ MAX1837 data sheet for instructions on selecting R1 and R2. R2's resistance value should be between 10k and 100k. The output voltage (VOUT) is determined by the following equation: VOUT = VFB((R1 / R2) + 1) where VFB = 1.25V. 2 and 3 Table 2. Alternate Step-Down Converters PART NUMBER PRESET OUTPUT VOLTAGE (V) 5.0 3.3 5.0 3.3 MAXIMUM OUTPUT CURRENT (mA) 125 125 250 250 TOP MARK AANW AANY AANX AANZ MAX1836EUT50 MAX1836EUT33 MAX1837EUT50 MAX1837EUT33 Enable/Disable The EV kit contains a 3-pin jumper (JU1) that allows the user to enable or disable the MAX1837. See Table 1 for jumper configurations. The IC can also be shut down by removing the shunt on jumper JU1 and applying a CMOS logic level signal at pin 2 of the jumper. 2 _______________________________________________________________________________________ MAX1837 Evaluation Kit Evaluates: MAX1836/MAX1837 VIN C1 10F C3 OPEN JU1 1 2 3 3 IN LX 4 D1 L1 22H R1 OPEN VOUT C2 150F 6.3V GND GND U1 MAX1837 5 SHDN OUT FB 6 1 JU2 2 GND R2 SHORT Figure 1. MAX1837 EV Kit Schematic 1.0" Figure 2. MAX1837 EV Kit Component Placement Guide-- Component Side _______________________________________________________________________________________ 3 MAX1837 Evaluation Kit Evaluates: MAX1836/MAX1837 1.0" Figure 3. MAX1837 EV Kit PC Board Layout--Component Side 1.0" Figure 4. MAX1837 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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