Evaluates: MAX1748/MAX1779 19-1740 Rev 3 11/04 MAX1748 Evaluation Kit General Description Features The MAX1748 evaluation kit (EV kit) is a fully assembled +2.7V to +5.5V Input Range (as Configured) and tested surface-mount circuit board that contains a Output Voltages boost switching regulator and two charge-pump volt- +10V Output at 200mA (Boost Switching) age-regulator circuits. The boost switching circuit is +15V Output >20mA (Positive Charge-Pump configured for a +10V output that provides up to 200mA Regulator) of current from a supply voltage of +2.7V to +5.5V. -5V Output >20mA (Negative Charge-Pump The positive charge-pump circuit is configured for a Regulator) +15V output that provides >20mA of current. The nega- Outputs Are Adjustable with Resistors tive charge-pump circuit is configured for a -5V output >85% Efficiency and provides >20mA of current. Power for either or both charge-pump inputs can be provided from the Internal MOSFET Switches +2.7VDC to +5.5VDC source or from the boost switch- 0.1A (typ) IC Shutdown Current ing-regulator output. 1MHz Boost Switching Frequency, The MAX1748 EV kit demonstrates low-quiescent cur- 500kHz Charge-Pump Switching Frequency rent and high efficiency (over 86%) for maximum bat- Low Profile tery life. Operation at 1MHz allows the use of tiny sur- face-mount components. The MAX1748 TSSOP pack- Evaluates MAX1779 (Component Replacement age (1.1mm max) with low-profile external components Required) allows this circuit to be less than 1.2mm high. The Surface-Mount Components MAX1748 EV kit can also be used to evaluate the Fully Assembled and Tested MAX1779 IC. Ordering Information PART TEMP RANGE IC PACKAGE MAX1748EVKIT 0C to +70C 16 TSSOP Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION C10C13 0 Not installed (0805) 3.3F, 10V X7R ceramic capacitors C1, C16, C17, 5 (1210) 0.15F, 25V X7R ceramic C18, C21 Taiyo Yuden LMK325BJ335KD C14 1 capacitor (1206) Taiyo Yuden TMK316BJ154MD 0.1F, 16V X7R ceramic capacitors C2, C4, C5, C6, 6 (0603) Not installed, ceramic capacitors C22, C23 C19, C20 0 Taiyo Yuden EMK107BJ104MA (0603) Not installed (R) 1.0A, 30V Schottky diode (S-flat) D1 1 Toshib a C RS02 o r N i hon EP 10QY03 C3 0 Sprague 592D336X0016R2T recommended 200mA, 25V Schottky diodes D2, D3 2 (SOT23) 1F, 16V X7R ceramic capacitors Fairchild BAT54S (1206) C7, C15, C24 3 Murata GRM319R71C105K D4, D5 0 Not installed (SOT23) 6.8H inductor 470pF, 50V C0G ceramic L1 1 Coilcraft LPO2506IB-682 C8 1 capacitor (0603) Murata GRM1885C1H47IJ R1 1 348k 1% resistor (0805) R3 1 549k 1% resistor (0805) 0.22F, 10V X7R ceramic R2, R4, R6 3 49.9k 1% resistors (0805) C9 1 capacitor (0603) R5 1 200k 1% resistor (0805) Taiyo Yuden LMK107BJ224KA Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX1748 Evaluation Kit Component Suppliers Component List (continued) SUPPLIER PHONE FAX DESIGNATION QTY DESCRIPTION R7 0 Not installed (0805) Coilcraft 847-639-6400 847-639-1469 Fairchild 408-822-2000 408-822-2102 R8, R9 2 1M 5% resistors (0805) Murata 814-237-1431 814-238-0490 U1 1 MAX1748EUE (16-pin TSSOP) Sprague 603-224-1961 603-224-1430 JU1, JU4, JU5 3 3-pin headers Sumida 708-956-0666 708-956-0702 None 3 Shunts (JU1, JU4, JU5) Taiyo Yuden 408-573-4150 408-573-4159 None 1 MAX1748 PC board Toshiba 949-455-2000 949-859-3963 None 1 MAX1748 data sheet None 1 MAX1748 EV kit data sheet Note: Please indicate that you are using the MAX1748/MAX1779 when contacting these component suppliers. The boost switching-regulator output voltage can be Quick Start adjusted from +2.7V to +13V with resistors. The positive The MAX1748 EV kit is fully assembled and tested. charge-pump regulators output can be adjusted up to Perform the following steps to verify board operation for +25V, and the negative regulator can be adjusted to a +10V output. Do not turn on the power supply until -15V with resistors. all connections are completed: The MAX1748 EV kit charge-pump circuits feature PC 1) Connect a +2.7VDC to +5.5VDC power supply to board pads for a positive voltage tripling and negative the PIN pad. Connect the supply ground to the voltage doubling output circuits. The MAX1748 EV kit GND pad. can evaluate the MAX1779 IC after replacing several 2) Connect a voltmeter to the V1 pad. components. See the Evaluating the MAX1779 section. 3) Verify that shunts JU1 (SHDN) are across pins Jumper Selection 1 and 2 and that shunts JU4 (SUPP) and JU5 Shutdown Mode (SUPN) are across pins 2 and 3. The MAX1748 EV kit features a shutdown mode that 4) Turn on the power supply and verify that the main reduces the MAX1748 quiescent current, preserving output (V1) is +10V. battery life. The 3-pin jumper (JU1) selects the shut- down mode for the MAX1748. Table 1 lists the selec- 5) Verify that the negative charge-pump regulator out- table jumper options. put (VN) is -5V. Positive Charge-Pump Regulator Feedback 6) Verify that the positive charge-pump regulator out- In the MAX1748 EV kit, jumper JU2 selects which posi- put (VP) is +15V. tive charge pump will be regulated: VP, a voltage dou- For instructions on selecting the feedback resistors for bler, or VPA, a voltage tripler. Table 2 lists the positive other output voltages, see the Output Voltage Selection charge-pump regulator jumper options. section. The input voltage range is +2.7V to +5.5V Negative Charge-Pump Regulator Feedback when selecting the output voltage. In the MAX1748 EV kit, jumper JU3 selects which nega- tive charge pump will be regulated: VN or VNA, a volt- Detailed Description age doubler. Table 3 lists the negative regulator jumper The MAX1748 EV kit contains a boost switching regula- options. tor and two regulating charge pumps. The EV kit oper- ates from a +2.7V to +5.5V input voltage range. The Positive Voltage Source boost switching regulator provides up to 200mA with a The MAX1748 EV kit features an option to choose which +10V output. voltage source feeds the positive charge-pump regula- tor circuit. Jumper JU4 selects the input voltage source The positive charge-pump regulator generates a +15V for the MAX1748s SUPP pin. Table 4 lists the options. output and can provide >20mA of current. The negative charge-pump regulator generates -5V output and can provide >20mA of current. Jumper options allow either charge pump to be fed power from PIN or V1. 2 Evaluates: MAX1748/MAX1779