19-2810; Rev 0; 4/03 MAX1565 Evaluation Kit Features ♦ ♦ ♦ ♦ ♦ ♦ ♦ ♦ Component List DESIGNATION QTY C1 C2 C3 C4, C5 C6A, C6B C7, C8 C9, C10, C17, C18, C19 C11 C12 DESCRIPTION ♦ ♦ ♦ ♦ 95% Efficiency 1.5V to 3.6V Input Voltage Range Main Step-Up Output: 3.35V or Adjustable Step-Down Output: 1.5V or Adjustable 5V General-Purpose Output CCD and LCD Bias Outputs (+15V/-7.5V) Power-Regulated Output for White LED Backlighting Optional General-Purpose Output Using the MAX1801 Slave Controller 1µA Shutdown Mode Internal Soft-Start Control Overload Protection for All Outputs Fully Assembled and Tested 1 6800pF, 25V X7R ceramic capacitor (0402) Murata GRP155R71E682K or equivalent 1 3300pF, 50V X7R ceramic capacitor (0402) Murata GRP155R71H332K or equivalent 1 0.01µF, 25V X7R ceramic capacitor (0402) Murata GRP155R71E103K or equivalent 2 1000pF, 50V X7R ceramic capacitors (0402) Murata GRP155R71H102K or equivalent 2) Preset the power supply to between 1.5V and 3.6V. 2 10µF, 10V X5R ceramic capacitors (1210) Taiyo Yuden LMK325BJ106MN or equivalent 1µF, 25V X7R ceramic capacitors (1206) TDK C3216X7R1E105K or equivalent 5) Connect the power-supply ground lead to GND. 2 5 10µF, 6.3V X5R ceramic capacitors (0805) Panasonic ECJ2FB0J106M or Taiyo Yuden JMK212BJ106MG 1 47µF, 6.3V X5R ceramic capacitor (1812) Taiyo Yuden JMK432BJ476MM 1 0.1µF, 16V X7R ceramic capacitor (0603) Taiyo Yuden EMK107BJ104MA or equivalent Ordering Information PART TEMP RANGE IC PACKAGE MAX1565EVKIT -40°C to +85°C 32 Thin QFN 5mm ✕ 5mm Quick Start Follow the steps below to verify operation of the MAX1565 EV kit. Do not turn on the power supply until all connections are completed: 1) Connect a series LED array or install surface-mount white LEDs in D7–D10. When connecting an LED array, connect the anode to LEDOUT+ and connect the cathode to LEDOUT-. 3) Turn off the power supply. 4) Connect the power-supply positive lead to IN. 6) Connect loads from outputs OUTSD, OUT1, OUT3A, and OUT3B to GND. See Table 1 for maximum load currents. 7) To enable the main step-up output, verify that JU1 has pins 2 and 3 shorted. 8) Verify that JU2–JU8 have pins 1 and 2 shorted. 9) Turn on the power supply. 10) Use a voltmeter to verify the OUTSU voltage (3.35V). 11) Connect a load, if desired, from OUTSU to GND. See Table 1 for maximum load currents. 12) To verify other outputs, move JU2–JU5 to short pins 2 and 3. Use a voltmeter to verify output voltages. ________________________________________________________________ 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: MAX1565 General Description The MAX1565 evaluation kit (EV kit) is a fully assembled and tested circuit board that accepts 1.5V to 3.6V input voltages and provides all the output voltages required for a typical digital still camera. The outputs consist of the main step-up output (3.35V), a step-down output (1.5V), a general-purpose 5V output, two outputs for charge-coupled device (CCD) and LCD bias, and an optional general-purpose output using the MAX1801 slave controller. Evaluates: MAX1565 MAX1565 Evaluation Kit Component List (continued) DESIGNATION QTY DESIGNATION QTY DESCRIPTION 1 1 100pF, 50V C0G ceramic capacitor (0402) Murata GRM36C0G101K050AD or equivalent C15 0 1000pF ceramic capacitor (0402), not installed R16 C16 0 Not installed (0805) R19 1 36.5kΩ ±1% resistor (0603) R20 1 33Ω ±5% resistor (0603) 4 500mA Schottky diodes (SOD-123) Central CMHSH5-2L or International Rectifier MBR0520 T1 1 Transformer Sumida CLQ72 type, sample number 6333-T507 U1 1 MAX1565ETJ (32-pin thin QFN 5mm x 5mm) U2 0 Not installed (8-pin SOT23), MAX1801 — 8 Shunts — 1 MAX1565ETJ EV kit PC board C13 C14 D1, D2, D3, D5 D4 1 D6 0 Not installed (SOD-123) 0 Not installed, surface-mount LEDs JU1–JU8 8 3-pin headers JU9 0 Not installed, PC board short L1 1 3.3µH inductor Sumida CDRH6D38-3R3 L2 1 4.2µH inductor Sumida CDRH5D28-4R2 L3 1 2µH inductor TOKO A918CY-2R0M L4 1 1.4µH inductor Sumida CDR43-1R4 or TOKO A918CY-1R5M N1 N2, N3 0 Not installed 1 N-channel MOSFET (6-pin SOT) Fairchild FDC637AN or International Rectifier IRLMS2002 2 R7, R11, R13, R17, R18 40V, 500mA Schottky diode (SOD-123) Central CMHSH5-4 D7–D10 L5 2 DESCRIPTION 1µF, 35V X5R ceramic capacitor (1206) Taiyo Yuden GMK316BJ105ML N-channel MOSFETs (SOT23) Fairchild FDN337N N4 0 Not installed (SOT23) R1 1 46.4kΩ ±1% resistor (0603) R2 1 26.1kΩ ±1% resistor (0603) R3 1 8.2kΩ ±5% resistor (0603) R4, R5 2 10kΩ ±5% resistors (0603) R6, R10, R12 0 Not installed, PC board shorts (0603) 0 Not installed (0603) R8 1 1MΩ ±1% resistor (0603) R9 1 90.9kΩ ±1% resistor (0603) R14 1 51kΩ ±5% resistor (0603) R15 1 2.2kΩ ±5% resistor (0603) 0 10kΩ ±5% resistor (0603), not installed Table 1. Output Voltages and Maximum Currents VOLTAGE (V) MAXIMUM CURRENT (mA) OUTSU 3.35 500 (Note 1) OUTSD 1.5 350 5 500 OUTPUT OUT1 LEDOUT+ to LEDOUT- 16 (Note 2) 15 OUT3A 15 20 OUT3B -7.5 (Note 3) 30 Note 1: If both OUTSU and OUTSD are operating, subtract half the OUTSD load current from the maximum load capability of OUTSU. Note 2: With four white LEDs connected in series from LEDOUT+ to LEDOUT-, this output is regulated to approximately 60mW per LED. With typical white LEDs, this is approximately 16V at 15mA. With an open circuit, LEDOUT+ is approximately 30V. Note 3: Only the 15V output is fed back to the controller regulation point. A small preload (at least 5mA) is needed for the -7.5V output to be in regulation. _______________________________________________________________________________________ MAX1565 Evaluation Kit Main Step-Up Output (OUTSU) The main output (OUTSU) powers the internal circuitry of the MAX1565 and must reach its regulation voltage before any other output turns on. To enable OUTSU, short pins 2 and 3 of JU1. When JU1 pins 1 and 2 are shorted, all outputs shut down and the IC is in low-current shutdown mode. When pins 1 and 2 of JU8 are shorted, OUTSU is preset to 3.35V. If a different output voltage is desired, see the Adjusting the Main Step-Up Output Voltage section. Step-Down Output (OUTSD) The step-down output (OUTSD) is preset to 1.5V. To enable OUTSD, short pins 2 and 3 of JU2. To shut down OUTSD, short pins 1 and 2 of JU2. For the preset 1.5V output, short pins 1 and 2 of JU7. To adjust the output voltage, see the Adjusting the Step-Down Output Voltage section. Step-Down OK (SDOK) The step-down OK output (SDOK) is an active-low, open-drain output that is low until the step-down converter has completed soft-start. For more details on SDOK, refer to the MAX1565 data sheet. OUT1 OUT1 is a regulated 5V output. To enable OUT1, connect pins 2 and 3 of JU3. If an output voltage other than 5V is desired, see the Adjusting the OUT1 Voltage section. Table 2. Jumper Functions JUMPER PINS 1 AND 2 PINS 2 AND 3 JU1 All outputs are shut down OUTSU enabled JU2 OUTSD shut down OUTSD enabled JU3 OUT1 shut down OUT1 enabled LEDOUT shut down LEDOUT enabled JU4 JU5 JU6 OUT3A/OUT3B shut down OUT3A/OUT3B enabled OUT1 set to 5V OUT1 adjustable JU7 OUTSD set to 1.5V OUTSD adjustable JU8 OUTSU set to 3.35V OUTSU adjustable load of 5mA (min) is required on OUT3B to maintain regulation at -7.5V. To enable OUT3A/OUT3B, short pins 2 and 3 of JU5. To turn off these outputs, short pins 1 and 2 of JU5. Customizing the MAX1565 Evaluation Kit Optional Step-Up Controller (OUT4) A MAX1801 step-up slave controller can be used with the MAX1565 EV kit to generate an additional output. To use this feature, install a MAX1801 in U2 on the solder side of the PC board. Contact Maxim for free samples of the MAX1801. Also install components N4, D6, L5, C15, C16, R16, R17, and R18. Refer to the MAX1801 data sheet for information on selecting these components. LED Outputs (LEDOUT+, LEDOUT-) LEDOUT+ and LEDOUT- are designed to drive a series array of white LEDs for backlighting. Connect an array consisting of two to six white LEDs in series to these outputs. The anode side connects to LEDOUT+ and the cathode side connects to LEDOUT-. Alternately, individual surface-mount white LEDs can be installed in D7–D10. If only two or three LEDs are connected, short the pads of the remaining unpopulated LEDs. With four white LEDs installed, the LED power is regulated to approximately 60mW each. To enable the LED output, short pins 2 and 3 of JU4. To turn off the LED output, short pins 1 and 2 of JU4. To adjust the LED brightness, see the Adjusting the LED Brightness section. CCD Outputs (OUT3A, OUT3B) OUT3A and OUT3B provide the voltages necessary for CCD bias. OUT3A is +15V, and OUT3B is -7.5V. These voltages are generated using a flyback transformer. The output voltage at OUT3A is regulated, while the voltage at OUT3B is controlled by the turns ratio of the transformer. If OUT3B is not loaded while OUT3A is loaded at 20mA or more, OUT3B is then -10V (typ). A Adjusting the Main Step-Up Output Voltage The main step-up output (OUTSU) can be adjusted from 2.7V to 5.5V using the following procedure: 1) Short pins 2 and 3 of JU8. 2) Cut the PC board trace that shorts the pads of R12 (located on the solder side of the PC board). 3) Select a value for R13 between 10kΩ and 100kΩ. 4) Solve for R12: V R12 = R13 × OUTSU - 1 1.25 5) Install R12 and R13. Adjusting the Step-Down Output Voltage The step-down output voltage (OUTSD) can be set from 1.25V to VOUTSU using the following procedure: 1) Short pins 2 and 3 of JU7. 2) Cut the PC board trace that shorts the pads of R10 (located on the solder side of the PC board). _______________________________________________________________________________________ 3 Evaluates: MAX1565 Detailed Description Evaluates: MAX1565 MAX1565 Evaluation Kit 3) Select a value for R11 between 10kΩ and 100kΩ. 4) Solve for R10: V R10 = R11 × OUTSD - 1 1.25 5) Install R10 and R11. Adjusting the OUT1 Voltage OUT1 can be set to any voltage above 1.25V. Note that OUT1 rises above its regulation voltage if the input voltage is greater than what OUT1 is set to. Use the following procedure to set VOUT1: 1) Short pins 2 and 3 of JU6. 2) Cut the PC board trace that shorts the pads of R6 (located on the solder side of the PC board). 3) Select a value for R7 between 10kΩ and 100kΩ. 4) Solve for R6: V R6 = R7 × OUT1 - 1 1.25 5) Install R6 and R7. Adjusting the LED Brightness Constant Power Regulation The MAX1565 EV kit uses a three-resistor feedback connection that regulates the LEDs at a nearly constant power. This configuration also protects the circuit by limiting the voltage at LEDOUT+ in case of an open circuit. Use the following procedure to set the LED power: 1) Select the desired power per LED (PLED) and the number of LEDs to be used (n), between two and six. 2) Determine the minimum and maximum LED forwardvoltage drop (V FMIN and V FMAX ) at the desired power. Refer to the LED data sheet for this information. For typical white LEDs, these are approximately VFMIN = 3V and VFMAX = 4V. 3) Find the minimum and maximum LED current, assuming a constant power of PLED: ILED(MIN) = PLED / VFMAX ILED(MAX) = PLED / VFMIN 4) Calculate the value for R20: R20 = 1.25 ILED(MAX) + ILED(MIN) 5) Choose a value for R15. The MAX1565 EV kit has a 2.2kΩ resistor installed for R15. In most cases, it is not necessary to change R15. 6) Calculate the value for R14: R14 = n × VFMIN × R15 ( 7) Find the open-circuit voltage of the circuit. To prevent damage to the EV kit when the LEDs are not installed, make sure this voltage is less than 30V: R14 VOPENCIRCUIT = 1.25 × + 1 R15 8) Install the new resistors. Constant-Current Regulation The MAX1565 EV kit can be configured to regulate the current through the LEDs. Note that this connection does not include the overvoltage protection provided by the constant-power design. Two to six LEDs must be connected from LEDOUT+ to LEDOUT-. Use the following procedure to configure the EV kit for constant-current regulation: 1) Remove R14. 2) Short the pads of R15. 3) Calculate the value for R20: R20 = 1.25 ILED 4) Replace R20 with the new value resistor. Adjusting the CCD Output Voltages A custom flyback transformer is used to generate outputs OUT3A and OUT3B. To change these outputs, replace T1 with a transformer designed for the new output voltages. OUT3A is regulated, while OUT3B depends on the turns ratio of the transformer. To set a new regulation voltage for OUT3A, use the following procedure: 1) Select a value for R9 between 10kΩ and 100kΩ. 2) Solve for R8: V R8 = R9 × OUT3A - 1 1.25 3) Replace R8 and R9. 4 ) 1.25 - ILED(MAX) × R20 _______________________________________________________________________________________ MAX1565 Evaluation Kit SUPPLIER PHONE Central Semiconductor The switching frequency of the MAX1565 is adjustable. Typically, frequencies from 400kHz to 500kHz provide a good compromise between efficiency and component size. To change the frequency, replace C14 and R19. Refer to the MAX1565 data sheet for information on selecting values for these components. WEBSITE 631-435-1110 www.centralsemi.com Fairchild Semiconductor — www.fairchildsemi.com International Rectifier 310-322-3331 www.irf.com Kamaya 260-489-1533 www.kamaya.com Murata 814-237-1431 www.murata.com Panasonic 714-373-7939 www.panasonic.com Sumida 847-956-0666 www.sumida.com Taiyo Yuden 408-573-4150 www.t-yuden.com TDK 847-803-6100 www.component.tdk.com TOKO 847-297-0070 www.toko.com Note: Please indicate that you are using the MAX1565 when contacting these component suppliers. IN IN L3 2µH C18 10µF C17 10µF T1 R3 C3 OUT1 +5V R4 C4 D1 N1 C6B 10µF 24 R1 C1 R6 SHORT 31 R5 C5 C6A 10µF 1 15 R2 C2 7 29 R7 OPEN 2 16 MAIN 3 2 1 17 MAIN JU8 3 2 1 18 MAIN JU7 3 2 1 12 MAIN JU6 3 2 1 6 MAIN COMP1 LXSU COMP2 DL3 COMP3 FB3 COMPSU COMPSD DL1 DL2 U1 FB2 LXSD MAX1565 FB1 FBSD FBSELSU INSD FBSELSD OUTSU FBSEL1 OUTSU ONSU SDOK ONSD FBSU 27 1 9 MAIN JU2 3 2 1 10 MAIN JU3 3 2 1 MAIN JU4 3 2 1 JU5 11 ON1 OSC ON2 REF ON3 GND PGND 3 PGND 20 1 7 N3 4 28 32 D3 6 R9 90.9kΩ 25 C7 1µF +15V 20mA C8 1µF OUT3B R8 1MΩ -7.5V 30mA DL2 FB2 L2 4.2µH 4 OUTSD C9 10µF 8 C10 10µF +1.5V R10 350mA SHORT MAIN R11 OPEN 5 C19 10µF 26 22 23 OUTSU C11 47µF SDOK D5 R12 SHORT 14 JU1 3 2 L1 3.3µH 21 OUT3A D2 8 19 +3.35V 500mA IN 13 R13 OPEN R19 36.5kΩ 30 EP REF JU9 C12 0.1µF OSC C14 100pF Figure 1. MAX1565 EV Kit Schematic (Sheet 1 of 2) _______________________________________________________________________________________ 5 Evaluates: MAX1565 Changing the Switching Frequency Table 3. Component Suppliers Evaluates: MAX1565 MAX1565 Evaluation Kit L5 OPEN +7V OSC D6 OUT4 C16 OPEN U2 N4 R17 OPEN 8 6 IN R18 OPEN R16 OPEN C15 OPEN L4 1.4µH 5 2 DL MAX1801 OSC FB REF IN COMP GND DCON REF 3 MAIN 7 4 LEDOUT+ D4 C13 1µF DL2 1 N2 R14 51kΩ F82 R15 2.2kΩ GND D7 OPEN D8 OPEN D9 OPEN R20 33Ω D10 OPEN LEDOUT- Figure 2. MAX1565 EV Kit Schematic (Sheet 2 of 2) 1.0" Figure 3. MAX1565 EV Kit Component Placement Guide— Component Side 6 1.0" Figure 4. MAX1565 EV Kit Component Placement Guide— Solder Side _______________________________________________________________________________________ MAX1565 Evaluation Kit Evaluates: MAX1565 1.0" 1.0" Figure 5. MAX1565 EV Kit PC Board Layout—Component Side 1.0" Figure 6. MAX1565 EV Kit PC Board Layout—Inner Layer 2 1.0" Figure 7. MAX1565 EV Kit PC Board Layout—Inner Layer 3 Figure 8. MAX1565 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.