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| 19-2518; Rev 2; 9/02 MAX1889 Evaluation Kit General Description The MAX1889 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a step-up switching regulator, a positive three-stage charge-pump and high-voltage positive linear-regulator controller, and a negative three-stage charge-pump and high-voltage negative linear-regulator controller. The step-up switching circuit is configured for a 9V output and provides up to 200mA from a DC supply voltage of 2.7V to 5.5V. The positive charge-pump and linear regulator are configured for a 20V output using two charge-pump stages providing up to 10mA. The negative charge pump and linear regulator are configured for a -7V output using a single charge-pump stage providing up to 10mA. Power for the positive charge-pump input can be provided by the DC input source or the step-up switching regulator output. Power for the negative charge-pump input can be provided by the DC input source or the power ground. The MAX1889 EV kit demonstrates low quiescent current and high efficiency (up to 90%) for maximum battery life. The EV kit features overload protection for the input and all outputs. Operation at 1MHz allows the use of tiny surface-mount components. The MAX1889 QFN package (1.0mm max) with low-profile external components allows this circuit to be 1.25mm high. o 2.7V to 5.5V Input Range o Output Voltages 9V Output at 200mA (Step-Up Switching) 20V Output >10mA (Positive Charge-Pump Regulator) -7V Output >10mA (Negative Charge-Pump Regulator) o Resistor-Adjustable Outputs o Up to Three Positive and Three Negative ChargePump Stages o Up to +28V and -22V Linear-Regulated Output (As Configured) o 90% Efficiency o 500kHz/1MHz Step-Up Switching Frequency o Overcurrent Protection o Low Profile o Surface-Mount Components o Fully Assembled and Tested Features Evaluates: MAX1889 Ordering Information PART MAX1889EVKIT TEMP RANGE 0C to +70C IC PACKAGE 16 QFN 5mm x 5mm Component List DESIGNATION QTY C1 1 DESCRIPTION 0.47F 10%, 16V X7R ceramic capacitor (0805) Taiyo Yuden EMK212BJ474KD 3.3F 20%, 6.3V X5R ceramic capacitors (0805) Taiyo Yuden JMK212BJ335MG 4.7F 20%, 10V X7R ceramic capacitors (1210) Taiyo Yuden LMK325BJ475MF 0.01F 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H103K DESIGNATION QTY C8 1 DESCRIPTION 220pF 10%, 50V COG ceramic capacitor (0603) TDK C1608COG1H221K 0.22F 10%, 10V X7R ceramic capacitor (0603) Taiyo Yuden LMK107BJ224KA 0.1F 10%, 50V X7R ceramic capacitors (0805) Taiyo Yuden UMK212BJ104KG 0.15F 10%, 50V X7R ceramic capacitors (1206) Taiyo Yuden UMK316BJ154KF C2, C3 2 C9 1 C4, C5, C6 3 C10-C14, C17, C18, C19, C21, C22 10 C7 1 C15, C20 2 ________________________________________________________________ Maxim Integrated Products 1 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. MAX1889 Evaluation Kit Evaluates: MAX1889 Component List (continued) DESIGNATION QTY C16, C23 2 DESCRIPTION 1F 10%, 25V X7R ceramic capacitors (0805) TDK C2012X7R1E105K 1000pF 10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H102K 100F 20%, 16V aluminum electrolytic capacitor (6.3mm x 5mm) Sanyo 16MV100UAX 2200pF 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H222K 470pF 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H471K 100pF 10%, 50V COG ceramic capacitor (0603) TDK C1608COG1H101K 1.0A, 30V Schottky diode (S-flat) Toshiba CRS02 200mA 25V Schottky diodes (SOT23) Fairchild BAT54S 200mA 75V diode (SOT23) Fairchild MMBD4148 2-pin headers 3-pin headers 4-pin headers 4.7H, 1.6A inductor Coilcraft Inc. LPO2506IB-472 DESIGNATION QTY P1 P2 Q1 1 0 1 DESCRIPTION 2.4A, -20V P-channel MOSFET (3-pin SuperSOT) Fairchild FDN304P Not installed MOSFET (8) 200mA, 40V NPN bipolar transistor (SOT23) Fairchild MMBT3904 200mA, 40V PNP bipolar transistor (SOT23) Fairchild MMBT3906 51.1k 1% resistor (0805) 150k 1% resistors (0805) 1M 5% resistors (0805) 76.8k 1% resistor (0805) 12.1k 1% resistor (0805) 10k 5% resistor (0805) 3k 5% resistors (0805) 24.3k 1% resistor (0805) 301k 1% resistor (0805) 20k 1% resistors (0805) 10 5% resistor (0805) 220k 5% resistor (0805) 15k 5% resistor (0805) 43.2k 1% resistor (0805) Not installed resistor (0603) MAX1889EGE (16-pin QFN 5mm x 5mm) Shunts (JU1-JU8) MAX1889 PC board MAX1889 data sheet MAX1889 EV kit data sheet C24, C26, C28 3 C25 1 Q2 R1 R2, R10, R20 R3, R4, R7 R5 R6 R8 R9, R12 R11 R13 R14, R18 R15 R16 R17 R19 R21 U1 None None None None 1 1 3 3 1 1 1 2 1 1 2 1 1 1 1 1 1 8 1 1 1 C27 1 C29 1 C30 1 D1 D2-D7 D8 JU1, JU2 JU3, JU8 JU4-JU7 L1 1 6 1 2 2 4 1 Component Suppliers SUPPLIER Coilcraft Fairchild Sanyo Taiyo Yuden TDK Toshiba PHONE 847-639-6400 408-822-2000 619-661-6322 800-348-2496 847-803-6100 949-455-2000 FAX 847-639-1469 408-822-2102 619-661-1055 847-925-0899 847-390-4405 949-859-3963 WEBSITE www.coilcraft.com www.fairchildsemi.com www.sanyovideo.com www.t-yuden.com www.component.tdk.com www.toshiba.com/taec Note: Please indicate that you are using the MAX1889 when contacting these component suppliers. 2 _______________________________________________________________________________________ MAX1889 Evaluation Kit Quick Start Recommended Equipment * * 2.7V to 5.5V, 2A DC power supply One voltmeter As configured, the negative charge pump uses one of the three charge-pump stages to generate approximately -7.6V and can provide greater than 10mA. The output is post-regulated to -7V using a linear-regulator controller and an external bipolar pass transistor. The negative linear regulator's output can be adjusted between 0 and -22V or, with additional circuitry, to even lower voltages (refer to the Linear-Regulator Controllers section in the MAX1889 data sheet). The EV kit includes input-current overload protection that shuts down the circuit if the input current exceeds a threshold for longer than 64ms. The threshold is set by resistor-divider R1, R2, R19, R20, and the RDS(ON) of MOSFET P1 or P2. Refer to the Setting the Input Overcurrent Threshold section in the MAX1889 data sheet for further details. The EV kit also includes output overload protection that shuts down the circuit if any of the output voltages drop below approximately 80% of their nominal value for longer than 64ms. Evaluates: MAX1889 Procedure The MAX1889 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) Verify that there are no shunts across jumpers JU1 (SHDN), JU2 (FREQ), JU3, JU4, and JU8. 2) Verify that a shunt is across pins 1 and 2 of JU7. 3) Verify that a shunt is across pins 1 and 3 of JU6. 4) Verify that a shunt is across pins 1 and 4 of JU5. 5) Connect the positive terminal of the input power supply to the PIN pad. Connect the negative terminal of the input power supply to the PGND pad. 6) Turn on the power supply and verify that the stepup regulator output (VBST) is 9V. 7) Verify that the positive linear-regulator output (VPL) is 20V. 8) Verify that the negative linear-regulator output (VNL) is -7V. For instructions on selecting the feedback resistors for other output voltages, see the Output Voltage Selection section. Jumper Selection Shutdown Mode The MAX1889 EV kit features a shutdown mode that reduces the MAX1889 quiescent current to less than 1A. The 2-pin jumper, JU1, selects the shutdown mode for the MAX1889 EV kit. Table 1 lists the selectable jumper options. Caution: Do not connect an external controller to the SHDN pad while a shunt is on JU1 since the external controller can be damaged. Detailed Description The MAX1889 EV kit contains a step-up switching regulator and two linear-regulator controllers. It operates from a DC power supply between 2.7V and 5.5V. The switching frequency is selectable between 500kHz and 1MHz. The input and outputs of the EV kit are protected against overload. The EV kit features a shutdown mode for maximum battery life. As configured, the step-up switching regulator generates a 9V output and can provide at least 200mA of current to the output. The step-up switching-regulator output voltage can be adjusted from the input voltage up to 13V with resistors (see the Output Voltage Selection section). As configured, the positive charge pump uses two of the three charge-pump stages to generate approximately 24V and can provide greater than 10mA. The output is post-regulated to 20V using a linear-regulator controller and an external bipolar pass transistor. The positive linear regulator's output can be adjusted between 1.25V and 28V or, with additional circuitry, to even higher voltages (refer to the Linear-Regulator Controllers section in the MAX1889 data sheet). Frequency Mode The MAX1889 EV kit features an option to choose the switching frequency. JU2 selects the frequency mode for the MAX1889 EV kit. Table 2 lists the selectable jumper options. The EV kit is configured for 1MHz operation. Optimum performance at 500kHz requires a larger inductor value (refer to the Inductor Selection section in the MAX1889 data sheet.) Positive Charge Pump The positive charge pump of the MAX1889 EV kit features an option to cascade up to three stages of charge pumps. Each stage of the charge pump can be powered from INPUT, VBST, or the previous stage. JU8, JU7, and JU6 configure the number of stages and select the voltage source for the positive charge pump on the MAX1889 EV kit. Tables 3, 4, and 5 list the jumper options. The default configuration of the positive charge pump of the MAX1889 EV kit is a two-stage charge pump powered from VBST as indicated in Tables 4 and 5. Refer to the Charge Pumps section of the MAX1889 data sheet for information on selecting a charge-pump configuration. 3 _______________________________________________________________________________________ MAX1889 Evaluation Kit Evaluates: MAX1889 Table 1. JU1 Functions SHUNT LOCATION Installed None SHDN PIN Connected to PGND Connected to IN through R3 MAX1889 EV KIT OUTPUT Shutdown mode MAX1889 enabled Table 2. JU2 Functions SHUNT LOCATION Installed None FREQ PIN Connected to PGND Connected to IN through R4 MAX1889 EV KIT FREQUENCY Frequency = 500KHz Frequency = 1MHz None External controller Logic high (IN) = enabled, connected logic low (PGND) = disabled to SHDN pad Table 3. JU8 Functions SHUNT LOCATION FIRST STAGE POSITIVE CHARGE PUMP OPERATING MODE Table 4. JU7 Functions SHUNT LOCATION SECOND STAGE POSITIVE CHARGE PUMP OPERATING MODE First stage of a twostage charge pump powered by VBST Second stage of a three-stage charge pump First stage of a twostage charge pump powered by INPUT Not used for one-stage charge pumps 1-2 Connected to VBST First stage of a threestage charge pump powered by VBST 1-2 (Default) Connected to VBST 2-3 First stage of a threeConnected to INPUT stage charge pump powered by INPUT Not used for one-stage or two-stage charge pumps 1-3 Connected to previous stage charge-pump output None Not used 1-4 Connected to INPUT None Not used Negative Charge Pump The negative charge pump of the MAX1889 EV kit features an option to cascade up to three stages of charge pumps. Each stage of the charge pump can be powered from INPUT, PGND, or the previous stage. JU3, JU4, and JU5 configure the number of stages and select the voltage source for the negative charge pump on the MAX1889 EV kit. Tables 6, 7, and 8 list the jumper options. The default configuration of the negative charge pump of the MAX1889 EV kit is a one-stage charge pump powered from PGND as indicated in Table 8. Refer to the Charge Pumps section of the MAX1889 data sheet for information on selecting a charge-pump configuration. Output Voltage Selection Step-Up Switching-Regulator Output Voltage The MAX1889 EV kit's step-up switching-regulator output is set to 9V by feedback resistors R5 and R6. To generate output voltages other than 9V (up to 13V), select different external voltage-divider resistors (R5, R6). The output capacitors (C4, C5, and C6) are rated to 10V. To set the output voltage greater than 10V, use higher-voltage rated capacitors. Refer to the Main StepUp Regulator, Output Voltage Selection section in the MAX1889 data sheet for instructions on selecting the resistors. 4 _______________________________________________________________________________________ MAX1889 Evaluation Kit Evaluates: MAX1889 Table 5. JU6 Functions SHUNT LOCATION THIRD STAGE POSITIVE CHARGE PUMP OPERATING MODE One-stage charge pump powered by VBST Last stage of a two-stage or three-stage charge pump One-stage charge pump powered by INPUT Table 6. JU3 Functions SHUNT LOCATION FIRST STAGE NEGATIVE CHARGE PUMP OPERATING MODE First stage of a threestage charge pump powered by INPUT First stage of a threestage charge pump powered by PGND Not used for onestage or two-stage charge pump 1-2 Connected to VBST 1-2 Connected to INPUT 1-3 (Default) Connected to previous stage charge-pump output 2-3 Connected to PGND None Not used 1-4 Connected to INPUT Table 7. JU4 Functions SECOND STAGE SHUNT NEGATIVE CHARGE LOCATION PUMP OPERATING MODE First stage of a twostage charge pump powered by INPUT Second stage of a threestage charge pump First stage of a twostage charge pump powered by PGND Not used for one-stage charge pump Table 8. JU5 Functions THIRD STAGE SHUNT NEGATIVE CHARGE LOCATION PUMP 1-2 1-3 Connected to INPUT Connected to previous stage charge-pump output Connected to PGND OPERATING MODE One-stage charge pump powered by INPUT Last stage of a twostage or three-stage charge pump One-stage charge pump powered by PGND 1-2 Connected to INPUT 1-3 Connected to previous stage charge-pump output 1-4 (Default) 1-4 Connected to PGND None Not used Positive Linear-Regulator Output Voltage The MAX1889 EV kit's positive linear-regulator output is set to 20V by feedback resistors R13 and R14. To generate output voltages other than 20V (1.25V to 28V), select different external voltage-divider resistors (R13, R14). Refer to the Linear-Regulator Controllers, Output Voltage Selection section in the MAX1889 data sheet for instructions on selecting the resistors. Negative Linear-Regulator Output Voltage The MAX1889 EV kit's negative linear-regulator output is set to -7V by feedback resistors R10 and R11. To generate output voltages other than -7V (0 to -22V), select different external voltage-divider resistors (R10, R11). Refer to the Linear-Regulator Controllers, Output Voltage Selection section in the MAX1889 data sheet for instructions on selecting the resistors. _______________________________________________________________________________________ 5 MAX1889 Evaluation Kit Evaluates: MAX1889 INPUT C2 3.3F 6.3V R19 43.2k 1% R20 150k 1% LX D1 C4 4.7F 10V C5 4.7F 10V VBST PGND C3 3.3F 6.3V L1 4.7H 1 R5 76.8k 1% 11 LX 5 R7 1M 3 D8 C7 0.01F 6 5 P2 7 8 4 3 P1 2 1 C6 4.7F 10V PGND C24 1000pF 15 R1 C30 51.1k 100pF 1% R2 150k 1% 16 IN GATE 13 OCN FB 1 2 PIN 3 14 OCP 12 R6 12.1k 1% TPA R8 10k C8 220pF R15 10 C1 0.47F C25 100F 16V U1 SHDN R4 1M R3 1M 1 JU1 REF SHDN 4 C9 0.22F GND 3 VREF MAX1889 10 JU2 7 6 FREQ PGND 2 PGND R21 OPEN DRVN FBN DRVN FBN DRVP FBP 8 9 DRVP FBP Figure 1. MAX1889 EV Kit Schematic (Sheet 1 of 2) 6 _______________________________________________________________________________________ MAX1889 Evaluation Kit Evaluates: MAX1889 LX C10 0.1F 3 D2 C11 0.1F 3 D3 C12 0.1F 3 D4 C17 0.1F 3 D5 C18 0.1F 3 D6 C19 0.1F 3 D7 R 2 INPUT 2 JU3 3 JU4 4 3 1 1 L 1 C13 0.1F R 2 L 1 C14 0.1F R 2 L 1 C15 0.15F R 2 C20 0.15F L 1 R 2 C21 0.1F L 1 C22 0.1F R 2 L 1 INPUT 3 2 JU8 INPUT 2 JU5 4 3 1 INPUT 2 JU6 3 4 2 INPUT 1 VBST INPUT 1 JU7 3 VBST 4 2 VBST 1 VP VN 2 1 Q1 R9 3k R12 3k 1 2 Q2 3 C26 1000pF R17 15k C29 C27 2200pF 470pF R18 20k 1% C28 1000pF R13 R14 301k 20k 1% 1% VNL PGND C16 1F 3 R10 R11 24.3k 150k 1% 1% VPL C23 1F PGND VREF VBST R16 220k DRVN FBN DRVP FBP Figure 1. MAX1889 EV Kit Schematic (Sheet 2 of 2) _______________________________________________________________________________________ 7 MAX1889 Evaluation Kit Evaluates: MAX1889 Figure 2. MAX1889 EV Kit Component Placement Guide-- Component Side Figure 3. MAX1889 EV Kit Component Placement Guide-- Solder Side Figure 4. MAX1889 EV Kit PC Board Layout--Component Side Figure 5. MAX1889 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. 8 _____________________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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