19-2198; Rev 1; 9/02 MAX1830 Evaluation Kit Features ♦ Delivering 3A Output Current 94% Efficiency ♦ Synchronous Rectifier Improves Efficiency ♦ Output Voltage Preset to 1.8V ♦ 1.5V, 1.8V, or 2.5V Selectable 1.1V to VIN Adjustable ♦ 3V to 5.5V Input Voltage Range ♦ No External Schottky Diode Required ♦ Less than 1µA (typ) IC Shutdown Current ♦ Surface-Mount Construction ♦ Fully Assembled and Tested Ordering Information Component List PART DESIGNATION QTY DESCRIPTION C1 1 22µF, 6.3V ceramic capacitor (1210) TDK C3225X5R0J226M C2 1 2.2µF, 10V ceramic capacitor (0805) TDK C2012X5R1A225M or Taiyo Yuden LMK212BJ225MG C3 1 470pF ceramic capacitor (0603) C4 1 1µF, 10V ceramic capacitor (0805) TDK C2012X5R1A105M or Taiyo Yuden LMK212BJ105MG C5 1 120µF, 4V, SP capacitor Panasonic EEFUD0G121R D1 1 Schottky diode (not installed) L1 1 1.5µH inductor Sumida CDRH6D28–4762T064 R1 1 10Ω ±5% resistor (0603) R2 1 1MΩ ±5% resistor (0603) R3 1 84.5kΩ ±1% resistor (0805) R4 1 Not installed (0805) R5 1 Not installed (0805) U1 1 MAX1830EEE (16-pin QSOP) JU1 1 2-pin header JU2 1 4-pin header JU3 0 Not installed (shorted with PC board trace) None 2 Shunts MAX1830EVKIT TEMP RANGE 0°C to +70°C IC PACKAGE 16 QSOP Component Suppliers SUPPLIER PHONE FAX Panasonic 201-392-7522 201-392-4441 Sumida 847-956-0666 847-956-0702 Taiyo Yuden 408-573-4150 408-573-4159 TDK 847-803-6100 847-803-6296 Note: Please indicate that you are using the MAX1830 when contacting these component suppliers. 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. ________________________________________________________________ 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: MAX1830/MAX1831 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/1.8V and 3.3V, or adjustable output voltage from 1.1V to VIN. Evaluates: MAX1830/MAX1831 MAX1830 Evaluation Kit 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. 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: Table 1. Jumper JU1 Function SHUNT LOCATION SHDN PIN Open Logic low: 1MΩ pulldown resistor Output voltage disabled Closed (Default) Connected to VIN Output voltage enabled Table 2. Output Voltage Configuration OUTPUT VOLTAGE (V) JU2 1.5 Not installed (FBSEL = OPEN) Installed (preset output voltage) 1.8 (MAX1830)* 3.3 (MAX1831) Connect 1 and 4 (FBSEL = REF) Installed (preset output voltage) 2.5 Connect 1 and 2 (FBSEL = VCC) Installed (preset output voltage) Adjustable Connect 1 and 3 (FBSEL = GND) Not installed (JU3 PC board trace must be cut) (output voltage set by R4 and R5) R4 = (VOUT x R5 / 1.1V ) - R5 Select R5 between 10kΩ and 25kΩ. MAX1830 OUTPUT JU3 *Default setting. 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. 2 _______________________________________________________________________________________ MAX1830 Evaluation Kit VIN GND R1 10Ω 1 LX 3 LX 14 LX 16 LX 2 IN 4 IN C1 22µF 12 C2 2.2µF VCC PGND SHDN R2 1MΩ 1.8V/3A OUT R4 OPEN JU3 D1 OPEN JU1 5 L1 1.5µH PGND U1 MAX1830 FB Evaluates: MAX1830/MAX1831 3V TO 5.5V C5 120µF GND 13 15 8 R5 OPEN 6 7 C3 470pF COMP TOFF REF R3 84.5kΩ GND 10 9 FBSEL 11 JU2 2 1 4 3 C4 1µF Figure 1. MAX1830 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX1830/MAX1831 MAX1830 Evaluation Kit 1.0" 1.0" Figure 2. MAX1830 Component Placement Guide— Component Side 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 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.