MAX710 Evaluation Kit ____________________________Features ♦ Step-Up/Down Voltage Conversion ♦ +1.8V to +11V Input Range ♦ 3.3V or 5V Selectable Output Voltage (MAX710) ♦ 2.7V to 5.5V Adjustable Output Voltage (MAX711) ♦ 250mA Output Current ♦ No External FETs Required ♦ Output is Fully Off during Shutdown ♦ 5µA Max Shutdown Current ♦ Low-Battery Comparator ♦ Low-Noise and High-Efficiency Modes ♦ Surface-Mount Components ____________________Component List DESIGNATION QTY DESCRIPTION C1, C2 2 100µF, 16V low-ESR tantalum capacitors AVX TPSE107M016R0100 or Sprague 593D107X0016E2W C3 1 0.1µF ceramic capacitor C4 1 4.7µF, 16V tantalum capacitor Sprague 595D475X0016A2T C5 0 Open D1 1 Schottky diode Motorola MBRS130LT3 1 22µH inductor Sumida CD75-220, Coiltronics UP2-220, or Coilcraft DO3316P-223 L1 ♦ Fully Assembled and Tested ______________Ordering Information PART MAX710EVKIT TEMP. RANGE 0°C to +70°C BOARD TYPE Surface Mount Note: To evaluate the MAX711, request a MAX711ESE free sample with the MAX710 EV kit. ______________Component Suppliers SUPPLIER PHONE FAX AVX (803) 946-0690 (803) 626-3123 Coilcraft (847) 639-6400 (847) 639-1469 Coiltronics (561) 241-7876 (561) 241-9339 (402) 564-3131 (402) 563-6418 R1, R2, R7, R8 0 Open Dale-Vishay R3, R4, R5 3 100kΩ, 5% resistors Motorola (602) 303-5454 (602) 994-6430 U1 1 MAX710ESE (SO-16) Sprague (603) 224-1961 (603) 224-1430 JU1, JU6 2 3-pin headers Sumida (847) 956-0666 (847) 956-0702 JU2, JU3, JU4 3 2-pin headers Vishay/Vitramon (203) 268-6261 (203) 452-5670 JU5 1 4-pin header None 3 Shunts None 1 MAX710 PC board None 1 MAX710 data sheet Note: Please indicate that you are using the MAX710 when contacting these component suppliers. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. Evaluates: MAX710/MAX711 _______________General Description The MAX710 evaluation kit (EV kit) is a step-up DC-DC converter with a linear-regulator output. The MAX710 accepts a +1.8V to +11V input and converts it to a 3.3V or 5V output for up to 250mA currents. The EV kit is optimized for battery applications where the input varies above and below the regulated output voltage. It can be set in two modes: one optimized for lowest noise, the other for highest efficiency. The MAX710 EV kit is a fully assembled and tested surface-mount circuit board. It can also be used to evaluate the MAX711, which has an adjustable output voltage (2.7V to 5.5V). Additional pads on the board accommodate the external feedback resistors for setting different output voltages. Evaluates: MAX710/MAX711 MAX710 Evaluation Kit _________________________Quick Start The MAX710 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Connect a +1.8V to +11V supply to the VIN pad. Connect ground to the GND pad. 2) Connect a voltmeter to the VOUT pad. 3) Place the shunt on JU1 across pins 1 and 2. 4) Turn on the power supply and verify that the output voltage is 3.3V. For a 5V output, remove the shunt from JU1 pins 1 and 2, and place it across JU1 pins 2 and 3. _______________Detailed Description The MAX710 EV kit is a step-up DC-DC converter with a linear-regulator output. It accepts a +1.8V to +11V input and converts it to a 3.3V or 5V output for up to 250mA currents. The EV kit is shipped configured for a 3.3V output. Jumper Selection The 3-pin header JU1 selects output voltage. Table 1 lists the selectable jumper options. Table 3. Jumper JU3 Functions SHUNT LOCATION STDBY PIN On Connected to GND Standby mode Off Connected to V+ Normal operation The 2-pin header JU4 selects the current limit. Table 4 lists the selectable jumper options. Table 4. Jumper JU4 Functions SHUNT LOCATION ILIM PIN 5 PIN 3/5 OUTPUT 1 and 2 Connected to V+ VOUT = 3.3V 2 and 3 Connected to GND VOUT = 5V The 2-pin header JU2 selects shutdown mode. Table 2 lists the selectable jumper options. Table 2. Jumper JU2 Functions SHUNT LOCATION SHDN PIN On Connected to GND Shutdown mode, VOUT = 0V Connected to V+ MAX710 enabled, VOUT = 3.3V or 5V Off OUTPUT The 2-pin header JU3 selects standby mode. Table 3 lists the selectable jumper options. 2 CURRENT LIMIT On Connected to V+ ILIM = 0.8A Off Connected to GND ILIM = 1.5A The 4-pin header JU5 selects low-noise or high-efficiency mode. Refer to the MAX710/MAX711 data sheet for information on operating configurations. Table 5 lists the selectable jumper options. Table 5. Jumper JU5 Functions SHUNT LOCATION OPERATING MODE N/E PIN Table 1. Jumper JU1 Functions SHUNT LOCATION OUTPUT 1 and 2 Connected to LBO High-efficiency, VIN(MAX) = 11V (LBI- must be connected to VOUT (JU6, 2 and 3)) 1 and 3 Connected to GND High-efficiency, VIN(MAX) = 7V 1 and 4 Connected to V+ Low-noise, VIN(MAX) = 11V The 3-pin header JU6 connects LBI- to either the output voltage or the reference voltage. Table 6 lists the selectable jumper options. Table 6. Jumper JU6 Functions SHUNT LOCATION LBI- PIN 1 and 2 Connected to REF 2 and 3 Connected to VOUT _______________________________________________________________________________________ MAX710 Evaluation Kit Evaluating Other Output Voltages To generate output voltages other than 3.3V or 5V, replace the MAX710 with the MAX711 (adjustable output), and select the external voltage resistor divider, R1 and R2. The only other modification required is removing the shunt from JU1. Refer to the Output Voltage Selection section in the MAX710/MAX711 data sheet for instructions on selecting R1 and R2 values. C5 is an optional space for a feed-forward capacitor. VIN 1.8V TO 11V C1 100µF 16V R7 SHORT R8 V+ R3 100k 11 4 V+ LBI+ STDBY SHDN LX PGND STDBY JU3 R5 100K V+ 4 3 1 JU5 U1 MAX710 3 8 LBO REF ILIM JU4 7 2 LX JU2 5 V+ L1 22µH MAX710 OUTPUT JU1 1-2 V+ 3.3V JU1 2-3 GND 5.0V OPEN SHDN R4 100K SHUNT LOCATION 3/5 PIN 13 C3 0.1µF PGND PS OUT LBI- REF V+ MBRS130T3 16 C2 100µF 16V 2 15 12 VOUT 3.3V 9 3 10 N/E LBO D1 1 3/5 (FB) 6 14 GND 2 JU6 1 REF C4 4.7µF 16V V+ JU1 (R1) OPEN (C5) OPEN 1 2 3 (R2) OPEN ( ) REFER TO MAX711. Figure 1. MAX710 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX710/MAX711 Low-Battery Comparator Output The MAX710 has an on-chip comparator for powergood detection that can be used to detect low-battery voltage. The comparator’s LBI- input is connected to either VOUT or reference, and its LBI+ input is connected to an external resistor divider, R7 or R8. Refer to the Low-Battery Comparator section of the MAX710/ MAX711 data sheet for instructions on selecting R7 and R8 values. Evaluates: MAX710/MAX711 MAX710 Evaluation Kit 1.0" 1.0" Figure 2. MAX710 EV Kit Component Placement Guide— Component Side Figure 3. MAX710 EV Kit PC Board Layout—Component Side 1.0" Figure 4. MAX710 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 © 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.