19-1987; Rev 0; 3/01 MAX1802 Evaluation Kit for Digital Still Cameras Features The MAX1802 evaluation kit (EV kit) accepts +3.3V to +11V battery voltages and provides all of the output voltages required in digital still cameras (DSC). This EV kit consists of the MAX1802 multi-output master converter and the MAX1801 slave step-up converter. The MAX1802 EV kit provides 10 separate output voltages. The MAX1802 provides one main system stepdown converter (+3.3V/1A), one DSP core step-down (+1.8V/400mA), one step-up converter for the backlight (+7V/100mA), three flyback outputs for the CCD, and three flyback outputs for the LCD. In addition, the MAX1801 provides one general-purpose step-up converter (+12V/100mA). The MAX1802 EV kit’s outputs are adjustable and are suitable for applications running from 4-cell alkaline, NiCd, or NiMH batteries, or from lithium ion (Li+) batteries (1 or 2 cell). ♦ 10 Outputs 2 Synchronous Rectified Step-Down Converters 2 Step-Up Converters 6 Flyback Outputs ♦ +3.3V to +11V Input Voltage Range Component Suppliers Ordering Information SUPPLIER ♦ All Converters Synchronized to Single Oscillator ♦ 100kHz to 1MHz Switching Frequency (set to 400kHz) ♦ Independent Shutdown of Each Converter ♦ Short-Circuit Protected Flyback Outputs ♦ Soft-Start on Each Output ♦ Fully Assembled and Tested PHONE FAX PART TEMP. RANGE AVX Central Semiconductor Fairchild Semiconductor Motorola Sumida Taiyo Yuden 803-946-0690 631-435-1110 408-721-2181 602-303-5454 847-956-0666 408-573-4150 803-626-3123 631-435-1824 408-721-1635 602-994-6430 847-956-0702 408-573-4159 MAX1802EVKIT 0°C to +70°C TDK 847-803-6100 847-803-6296 IC PACKAGE 32 TQFP Note: Please indicate that you are using the MAX1802 when contacting these component suppliers. Component List DESIGNATION QTY DESCRIPTION C1 C2, C5, C6, C25 1 4 100pF ceramic capacitor (0603) 0.1µF ceramic capacitors (0603) C3, C24 2 10µF, 16V ceramic capacitors (1812) TDK C4532X7R1C106M C4, C7, C8, C9 4 1000pF ceramic capacitors (0603) C10 1 4.7nF ceramic capacitor (0603) C11 1 470pF ceramic capacitor (0603) C12 1 C13, C17 C14 DESIGNATION QTY DESCRIPTION C15 1 100µF, 10V tantalum capacitor (D case) AVX TPSD107M010R0100 C16 1 22µF, 16V ceramic capacitor (1812) TDK C4532X5R1C226M C18–C23 6 1µF, 25V ceramic capacitors (1206) TDK C3216X7R1E105M 4.7µF, 16V ceramic capacitor (1206) TDK C3216X5R1C475M C26 1 10µF, 16V ceramic capacitor (1210) TDK C3225X5R1C106M 2 1µF, 10V ceramic capacitors (0805) TDK C2012X5R1A105M D1, D4, D6 3 1 10µF, 10V ceramic capacitor (1206) TDK C3216X5R1A106M P-N junction diodes (SOT323) Central Semiconductor CMSD-4448 D2, D3, D5 3 Schottky diodes (SOT323) Central Semiconductor CMSSH-3 ________________________________________________________________ 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: MAX1802 General Description MAX1802 Evaluation Kit for Digital Still Cameras Evaluates: MAX1802 Component List (continued) DESIGNATION QTY Schottky diodes (SOD123) Motorola MBR0520L or Fairchild Semiconductor MBR0520L T1 1 Sumida transformer CLQ72-type package Sample number: 6333-T334 T2 1 6 Schottky diode (S-FLAT) Toshiba CRS05 (not installed) 3-pin headers Sumida transformer CLQ72-type package Sample number: 6333-T333 JU7–JU12 6 2-pin headers U1 1 MAX1802EHJ (32-pin TQFP) L1 1 4.7µH inductor Sumida CR43-4R7 U2 1 MAX1801EKA (8-pin SOT23) None 12 Shunts DESIGNATION QTY D7, D8 2 D9 1 JU1–JU6 DESCRIPTION L2, L4 2 10µH inductors Sumida CDRH6D28-100 L3 1 3.3µH inductor Sumida CR43-3R3 Q1, Q2, Q3, Q5 4 N-channel MOSFETs (SuperSOT-3) Fairchild Semiconductor FDN337N Recommended Equipment • +3.3V to +11V battery or power supply • Digital voltmeter (DVM) Q4 1 P-channel MOSFET (SO-8) Vishay/Siliconix SI9803DY Q6 1 N-channel MOSFET (SuperSOT-3) Fairchild Semiconductor FDN359AN R1 1 40.2kΩ ±1% resistor (0603) R2 1 866kΩ ±1% resistor (0603) R3, R19, R20, R22, R24, R28 2) Before loading any output, check the output voltage and output current capability shown in Table 1. 6 100kΩ ±1% resistors (0603) R4, R13, R14, R15 4 10kΩ ±5% resistors (0402) 3) Make sure jumpers JU7–JU12 are connected if no external loads are attached to the OUT1A, OUT1B, OUT1C, OUT2A, OUT2B, and OUT2C outputs. R5, R6, R26, R27, R30, R31 6 Open (0402), not installed 4) Attach a +3.3V to +7V battery or power supply to IN. R7 1 Short (0603), not installed, shorted in the PC board layout 5) Using the DVM, measure the voltage at MAIN, CORE, OUT1_, OUT2_, OUT3, and OUT4. R8–R12 5 Open (0603), not installed R16 1 33kΩ ±5% resistor (0603) R17 1 91kΩ ±5% resistor (0603) R18 1 464kΩ ±1% resistor (0603) R21 1 44.2kΩ ±1% resistor (0603) R23 1 165kΩ ±1% resistor (0603) R25, R29 2 301kΩ ±1% resistors (0603) R32, R33, R37, R38, R41, R42 6 3kΩ ±5% resistors (1206) R34, R35, R39, R40 4 200Ω ±5% resistors (1206) R36 1 750Ω ±5% resistor (1206) 2 DESCRIPTION Quick Start 1) Make sure jumpers JU1–JU6 are connected in the ON position. This ensures all converters will turn on at power-up. Detailed Description MAIN Output The main output (MAIN) powers the core supply of the MAX1802. MAIN must be regulated before any of the other outputs function. To enable MAIN, place jumper JU4 to the ON position. Apply +3.3V to +11V between IN and GND. The voltage between MAIN and GND should be approximately +3.3V. If IN is less than +3.3V, MAIN will not be regulated. CORE Output The core output (CORE) is powered from MAIN and regulated at +1.8V using a synchronous-rectified step-down converter. Drawing more than 200mA out of CORE reduces the current capability at MAIN. To enable CORE, place jumper JU5 to the ON position. _______________________________________________________________________________________ MAX1802 Evaluation Kit for Digital Still Cameras LABEL VOLTAGE/CURRENT MAIN +3.3V at 1A CORE +1.8V at 400mA OUT1A +13.5V at 10mA OUT1B +5V at 50mA OUT1C -9V at 10mA OUT2A +13.5V at 10mA OUT2B +5V at 50mA OUT2C -19.0V at 10mA OUT3 +7V at 100mA OUT4 +12V at 100mA OUT1_ (Flyback Outputs) The voltages at OUT1_ are typical of CCD bias voltages. The output voltages are +13.5V/10mA, +5V/50mA, and -9V/10mA. These voltages are generated through a custom flyback transformer. OUT1B (+5V) is used to regulate the flyback circuit. The other output voltages (+13.5V and -9V) are controlled by the turns-ratio of the flyback transformer. If the +13.5V and -9V outputs are not loaded at the fixed 10mA load, then the output voltage will change from the nominal loaded output voltage. Loads are included on the MAX1802 EV kit by shorting jumpers JU7 through JU12. If external loads are used, remove these jumpers to disable the built-in loads. To enable OUT1_, place jumper JU6 to the ON position. To disable OUT1_, place jumper JU6 to the OFF position. To enable and disable the output voltages using an external signal, see the Logic Control of the Output Voltages section. If a different set of output voltages is required, see the Setting the Flyback Circuit Voltages section. OUT2_ (Flyback Outputs) The voltages at OUT2_ are typical of LCD bias voltages. The output voltages are +13.5V/10mA, +5V/50mA, and -19V/10mA. These voltages are generated through a custom flyback transformer. OUT2B (+5V) is used to regulate the flyback circuit. The other output voltages (+13.5V and -19V) are controlled by the turns-ratio of the flyback transformer. If the +13.5V and -19V outputs are not loaded at the fixed 10mA load, then the output voltage will change from the nominal loaded output voltage. Loads are included on the MAX1802 EV kit by shorting jumpers JU7 through JU12. If external loads are used, disable the built-in loads by removing these jumpers. To enable OUT2_, place jumper JU2 to the ON position. To disable OUT2_, place jumper JU2 to the OFF position. To enable and disable the output voltages using an external signal, see the Logic Control of the Output Voltages section. If a different set of output voltages is required, see the Setting the Flyback Circuit Voltages section. OUT3 The voltage at OUT3 is typical of that required by a CCFL backlight inverter. To enable OUT3, place jumper JU3 to the ON position. Place the external load between OUT3 and GND. To change the output voltage of OUT3, see the Setting the Step-Up Output Voltage section. OUT3 is configured for a 7V output. For input voltages greater than 7V, the output will approximately track the input. OUT3 can be configured to drive a white LED backlight instead of a CCFL backlight. OUT4 The voltage at OUT4 is a general-purpose +12V output that can supply up to 100mA. To enable OUT4, place jumper JU1 to the ON position. Place the external load between OUT4 and GND. To change the output voltage of OUT4, see Setting the Step-Up Output Voltage section. Customizing the MAX1802 EV Kit Setting the Main Output Voltage MAIN is set by a voltage-divider, which drops the output voltage to the +1.25V feedback threshold voltage. To change the 3.3V setting of MAIN, change the resistor-divider ratio by changing R23. Use: R23 = 80kΩ/V x (VOUT - 1.248V) The MAIN output voltage may be set to any voltage between +2.7V and +5.5V. For additional information, refer to the MAX1802 IC data sheet. Setting the Core Output Voltage CORE is set by a voltage-divider, which drops the output voltage to the +1.25V feedback threshold voltage. To change the +1.8V setting of CORE, change the resistor-divider ratio by changing R21. Use: R21 = 80kΩ/V x (VCORE - 1.248V) CORE may be set to any voltage between +1.25V and +5.5V but must remain less than the voltage at MAIN. The MAX1802 EV kit is configured so that MAIN powers the CORE input. _______________________________________________________________________________________ 3 Evaluates: MAX1802 Table 1. Output Voltage and Current Capability Evaluates: MAX1802 MAX1802 Evaluation Kit for Digital Still Cameras Setting the Flyback Circuit Voltages (OUT1_ and OUT2_) A flyback circuit generates OUT1_ and OUT2_. This allows multiple positive or negative voltages to be generated by a single converter and allows the voltages to drop to 0 when the converter is disabled. The transformer must be designed for a given set of output voltages. On the flyback circuits, only a single output voltage is directly regulated by the MAX1802. All other voltages are controlled by the transformer’s turns-ratio. If another set of output voltages is required, a transformer with a different secondary turns-ratio must be used. Consult the transformer manufacturer for details. Typically, the highest power, positive voltage output of the flyback transformer is fed back to the controller. To change the regulated output voltage, use a different resistor in the voltage-divider. Table 2 lists the resistors used for each output. Leave the resistors off (open) for unregulated outputs. For a given output voltage, if the bottom resistor is 100kΩ, then the top resistor value is: R__ = 80kΩ/V x (VOUT - 1.248V) Setting the Step-Up Output Voltage (OUT3 and OUT4) The output voltage of the step-up circuit voltages (OUT3 and OUT4) may be set to any voltage above +1.25V. Note that if the battery voltage is greater than the step-up regulation voltage, the output voltage will rise above the regulation voltage. To set the output voltage, choose the voltage-divider resistors. For OUT3, choose: R18 = 80kΩ/V x (VOUT3 - 1.248V) For OUT4, choose: Setting the Switching Frequency All of the switching regulators are synchronized to a single oscillator frequency. The oscillator capacitor (C1) is charged through R1 and discharged internally by the MAX1802. The MAX1802 EV kit operates at 400kHz, with MAIN set to 3.3V. Change resistor R1 or capacitor C1 if a different MAIN voltage is used or another frequency is desired. Refer to the MAX1802 IC data sheet for the correct values to use for R1 and C1. Logic Control of the Output Voltages Each controller may be independently turned off or on using jumpers (JU1–JU6) or with logic voltages. To control an output using an external logic signal, remove the ON and OFF jumper for that output and place the control signal on the corresponding ON_ pad. To enable MAIN, drive the ON pad greater than +1.8V. To enable CORE or OUT1, drive the corresponding ON_ pad greater than +1.6V. To enable OUT2, OUT3, or OUT4 with the default maximum duty cycle, drive the corresponding ON_ pad to greater than or equal to the reference voltage. If a resistor-divider is used for duty cycle adjustment (R5, R6, R9, R10, R11, and R12), use an open-drain driver on the corresponding ON_ pad. See the Setting the Maximum Duty Cycle section for additional information. To disable each output individually, drive the voltage at the corresponding ON_ pad less than +0.3V. Note that the voltages at OUT3 and OUT4 will drop slightly below the battery voltage when off, due to the DC current path through the inductor and output rectifier. For the step-up outputs, a switch may be added between the output voltage and the load to disconnect them while the output is disabled. R2 = 80kΩ/V x (VOUT3 - 1.248V) Setting the Maximum Duty Cycle DCON1, DCON2, and DCON3 set the maximum duty cycle for controllers 1, 2, and 3, respectively. A resistordivider from REF to DCON_ sets the corresponding maximum duty cycle up to 90%. The MAX1802 EV kit has DCON_ shorted to REF, producing a default duty cycle of 76%. Refer to the MAX1802 IC data sheet for additional information. 4 Table 2. Flyback Converter Feedback Resistors OUTPUT OUT1_ OUT2_ OUT_A R30 R26 OUT_B R29 R25 OUT_C R31 R27 _______________________________________________________________________________________ _______________________________________________________________________________________ ON4 OUT4 GND IN JU1 1 2 3 VL R3 100kΩ 1% R2 866kΩ 1% R5 OPEN 2 L3 3.3µH R4 10kΩ 1 Q5 3 2 C4 1000pF C3 10µF D8 IN U2 IN 7 COMP GND OUT3 IN C8 1000pF C1 100pF C2 0.1µF R11 OPEN REF R19 100kΩ 1% R18 464kΩ 1% C10 4.7nF C12 4.7µF 1 D7 2 R17 91kΩ ON1 ON2 3 1 Q1 2 L1 4.7µH IN 1 2 3 JU6 VL VL 1 2 3 JU2 R8 OPEN R10 OPEN C26 10µF C6 0.1µF R1 40.2kΩ 1% R7 SHORT OSC R9 OPEN C11 470pF R16 33kΩ 1 2 3 JU5 VL 1 2 3 JU3 VL R12 OPEN R15 10kΩ C9 1000pF ONC ON3 C5 0.1µF VL R14 10kΩ 1 2 3 JU4 R13 10kΩ C7 1000pF ONM R6 OPEN GND 2 REF 3 FB MAX1801 OSC 1 DL 4 DCON 5 6 8 COMPC COMPM COMP3 COMP2 COMP1 ON1 ONC ONM 22 U1 5 16 19 15 6 FB3 GND PGND VL 32 25 FBC LXC PGNDM DLM 28 30 26 9 8 LXM 7 DHM VDDC 27 FBM 1 FB2 DL2 FB1 4 VH 12 DL1 VDDM MAX1802 DCON3 DCON2 DCON1 20 DL3 29 2 21 17 14 13 24 3 23 18 11 OSC 31 REF 10 IN 3 1 Q3 C13 1.0µF 4 4 1 5 2 5 6 7 3 C14 10µF 1 Q6 7 8 Q4 13 2 56 L4 10µH C17 1.0µF 2 4 6 7 T2 XF MR–CLQ72 IN 8 C25 O.1µF 1 2 Q2 3 C24 10µF 1 1 3 1 1 3 D9 C16 22µF D6 D5 D4 D3 D2 R21 44.2kΩ 1% R20 100kΩ 1% 2 1 3 1 1 3 1 T1 XF MR–CLQ72 8 1 1 D1 3 GND MAIN R42 3kΩ R41 3kΩ OUT2C JU11 C20 1.0µF R36 750Ω R34 200Ω JU8 R33 3kΩ OUT1C R22 100kΩ 1% C15 100µF 10V R23 165kΩ 1% CORE L2 10µH JU9 JU7 R27 OPEN JU12 C19 1.0µF C18 1.0µF R31 OPEN C22 1.0µF C21 1.0µF C23 1.0µF R32 3kΩ R39 200Ω R35 200Ω R40 200Ω JU10 R28 100kΩ 1% R24 100kΩ 1% R25 301kΩ 1% OUT2B R29 301kΩ 1% OUT1B R37 3kΩ R30 OPEN R38 3kΩ R26 OPEN OUT2A GND OUT1A Evaluates: MAX1802 +2.7V TO +7.0V MAX1802 Evaluation Kit for Digital Still Cameras Figure 1. MAX1802 EV Kit Schematic 5 Evaluates: MAX1802 MAX1802 Evaluation Kit for Digital Still Cameras ACTUAL BOARD DIMENSIONS: 3in. X 4in. Figure 2. MAX1802 EV Kit Component Placement Guide—Top Silkscreen ACTUAL BOARD DIMENSIONS: 3in. X 4in. Figure 4. MAX1802 EV Kit PC Board Layout—GND Layer 2 6 ACTUAL BOARD DIMENSIONS: 3in. X 4in. Figure 3. MAX1802 EV Kit PC Board Layout—Component Side ACTUAL BOARD DIMENSIONS: 3in. X 4in. Figure 5. MAX1802 EV Kit PC Board Layout—VCC Layer 3 _______________________________________________________________________________________ MAX1802 Evaluation Kit for Digital Still Cameras Figure 6. MAX1802 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. 7 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Evaluates: MAX1802 ACTUAL BOARD DIMENSIONS: 3in. X 4in.