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| 19-2198; Rev 1; 12/02 MAX1830 Evaluation Kit General Description The MAX1830 evaluation kit (EV kit) provides a 1.8V output from a 3V to 5.5V input voltage source. It delivers up to 3A output current with a 94% (max) efficiency. The MAX1830 EV kit includes the MAX1830 step-down switching regulator with an internal synchronous rectifier to increase efficiency and reduce the number of external components. The resistor-programmable fixedoff-time, current-mode architecture allows an optimum response to load and line transients. This EV kit, as configured, operates at approximately 550kHz from 3.3V inputs and 770kHz from 5V inputs. The MAX1830 EV kit can be configured to produce a preset output voltage of 1.5V, 1.8V, 2.5V, or is feedback adjustable from 1.1V to VIN. This EV kit can also be used to evaluate the MAX1831 with preset output voltages of 1.5V, 2.5V, and 3.3V, or adjustable output voltage from 1.1V to VIN. o Delivering 3A Output Current 94% Efficiency o Synchronous Rectifier Improves Efficiency o Output Voltage Preset to 1.8V o 1.5V, 1.8V, or 2.5V Selectable 1.1V to VIN Adjustable o 3V to 5.5V Input Voltage Range o No External Schottky Diode Required o Less than 1A (typ) IC Shutdown Current o Surface-Mount Construction o Fully Assembled and Tested Features Evaluates: MAX1830/MAX1831 Component List PART DESIGNATION C1 QTY 1 DESCRIPTION 22F, 6.3V ceramic capacitor (1210) TDK C3225X5R0J226M 2.2F, 10V ceramic capacitor (0805) TDK C2012X5R1A225M or Taiyo Yuden LMK212BJ225MG 470pF ceramic capacitor (0603) 1F, 10V ceramic capacitor (0805) TDK C2012X5R1A105M or Taiyo Yuden LMK212BJ105MG 120F, 4V, SP capacitor Panasonic EEFUD0G121R Schottky diode (not installed) 1.5H inductor Sumida CDRH6D28-4762T064 10 5% resistor (0603) 1M 5% resistor (0603) 84.5k 1% resistor (0805) Not installed (0805) Not installed (0805) MAX1830EEE (16-pin QSOP) 2-pin header 4-pin header Not installed (shorted with PC board trace) Shunts SUPPLIER Panasonic Sumida C3 C4 1 1 Taiyo Yuden TDK MAX1830EVKIT Ordering Information TEMP RANGE 0C to +70C IC PACKAGE 16 QSOP Component Suppliers PHONE 201-392-7522 847-956-0666 408-573-4150 847-803-6100 FAX 201-392-4441 847-956-0702 408-573-4159 847-803-6296 C2 1 Note: Please indicate that you are using the MAX1830 when contacting these component suppliers. C5 D1 L1 R1 R2 R3 R4 R5 U1 JU1 JU2 JU3 None 1 1 1 1 1 1 1 1 1 1 1 0 2 Quick Start The MAX1830 EV kit is a fully assembled and tested surface-mount board. Follow the steps below for proper board operation. Do not turn on the power supply until all connections are completed: 1) Connect a voltmeter and load (if any) from VOUT to GND. 2) Verify that there is a shunt on JU1 (shutdown disabled). 3) Verify that the JU2 shunt is connected across pins 1 and 4 to set the output to 1.8V. 4) Connect a 3V to 5.5V supply to the pads marked VIN and GND (supply off). 5) Turn on the power supply and verify that the output voltage is 1.8V. 6) See the Output Voltage Selection section to modify the board for a different output voltage. 1 ________________________________________________________________ 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. MAX1830 Evaluation Kit Evaluates: MAX1830/MAX1831 Detailed Description The MAX1830 EV kit can be configured to produce a preset output voltage of 1.5V, 1.8V, 2.5V, or is feedback adjustable from 1.1V to VIN. As configured, the kit is preset for 1.8V. It operates from an input voltage range of 3V to 5.5V and delivers up to 3A of output current. Table 1. Jumper JU1 Function SHUNT LOCATION Open Closed (Default) SHDN PIN Logic low: 1M pulldown resistor Connected to VIN MAX1830 OUTPUT Output voltage disabled Output voltage enabled Jumper Selection Jumper JU1 controls the MAX1830's shutdown function. Table 1 lists the jumper options. Output Voltage Selection The output voltage can be modified from the preset 1.8V output voltage two different ways. The first way is to change the output voltage to one of the other preset output voltages (1.5V or 2.5V). This is done by changing the jumper JU2 setting (Table 2). The second way is to add feedback resistors (R4 and R5) and connect FBSEL to GND, which allows an adjustable output voltage of 1.1V to VIN. Note: Adjustable operation may require replacement of C5 with output capacitor rated for higher voltage. The resistors can be calculated according to the following equation: R4 = (VOUT x R5 / 1.1V ) - R5 Select R5 between 10k and 25k. The inductor provided in the MAX1830 EV kit is optimized for a 3V to 5.5V input voltage range and a 1.8V/3A output voltage. If the output needs to be changed to another output voltage, refer to the MAX1830 data sheet for the recommended inductor value for your application. Table 2. Output Voltage Configuration OUTPUT VOLTAGE (V) 1.5 1.8* (MAX1830) 3.3* (MAX1831) 2.5 JU2 Not installed (FBSEL = OPEN) Connect 1 and 4 (FBSEL = REF) Connect 1 and 2 (FBSEL = VCC) Connect 1 and 3 (FBSEL = GND) JU3 Installed (preset output voltage) Installed (preset output voltage) Installed (preset output voltage) Not installed (JU3 PC board trace must be cut) (output voltage set by R4 and R5) Adjustable *Default setting. 2 _______________________________________________________________________________________ MAX1830 Evaluation Kit Evaluates: MAX1830/MAX1831 L1 1.5H 3V TO 5.5V VIN GND R1 10 C1 22F 2 IN 4 IN 1 LX 3 LX 14 LX 16 LX 1.8V/3A OUT C5 120F 12 C2 2.2F R4 OPEN D1 OPEN JU3 VCC GND JU1 PGND 5 R2 1M SHDN 13 15 U1 MAX1830 PGND FB 8 R5 OPEN 6 C3 470pF R3 84.5k 7 COMP TOFF REF GND FBSEL 11 JU2 21 3 4 C4 1F 10 9 Figure 1. MAX1830 EV Kit Schematic _______________________________________________________________________________________ 3 MAX1830 Evaluation Kit Evaluates: MAX1830/MAX1831 1.0" Figure 2. MAX1830 Component Placement Guide-- Component Side 1.0" Figure 3. MAX1830 EV Kit PC Board Layout--Component Side 1.0" Figure 4. MAX1830 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) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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