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19-2810; Rev 0; 4/03
MAX1565 Evaluation Kit
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. o o o o o o o o
Features
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 1A Shutdown Mode Internal Soft-Start Control Overload Protection for All Outputs Fully Assembled and Tested
Evaluates: MAX1565
Component List
DESIGNATION QTY DESCRIPTION 6800pF, 25V X7R ceramic capacitor (0402) Murata GRP155R71E682K or equivalent 3300pF, 50V X7R ceramic capacitor (0402) Murata GRP155R71H332K or equivalent 0.01F, 25V X7R ceramic capacitor (0402) Murata GRP155R71E103K or equivalent 1000pF, 50V X7R ceramic capacitors (0402) Murata GRP155R71H102K or equivalent 10F, 10V X5R ceramic capacitors (1210) Taiyo Yuden LMK325BJ106MN or equivalent 1F, 25V X7R ceramic capacitors (1206) TDK C3216X7R1E105K or equivalent 10F, 6.3V X5R ceramic capacitors (0805) Panasonic ECJ2FB0J106M or Taiyo Yuden JMK212BJ106MG 47F, 6.3V X5R ceramic capacitor (1812) Taiyo Yuden JMK432BJ476MM 0.1F, 16V X7R ceramic capacitor (0603) Taiyo Yuden EMK107BJ104MA or equivalent
C1
1
o o o o
Ordering Information
PART MAX1565EVKIT TEMP RANGE -40C to +85C IC PACKAGE 32 Thin QFN 5mm 5mm
C2
1
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-. 2) Preset the power supply to between 1.5V and 3.6V. 3) Turn off the power supply. 4) Connect the power-supply positive lead to IN. 5) Connect the power-supply ground lead to GND. 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.
1
C3
1
C4, C5
2
C6A, C6B
2
C7, C8
2
C9, C10, C17, C18, C19
5
C11
1
C12
1
________________________________________________________________ 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.
MAX1565 Evaluation Kit Evaluates: MAX1565
Component List (continued)
DESIGNATION QTY C13 1 DESCRIPTION 1F, 35V X5R ceramic capacitor (1206) Taiyo Yuden GMK316BJ105ML 100pF, 50V C0G ceramic capacitor (0402) Murata GRM36C0G101K050AD or equivalent 1000pF ceramic capacitor (0402), not installed Not installed (0805) 500mA Schottky diodes (SOD-123) Central CMHSH5-2L or International Rectifier MBR0520 40V, 500mA Schottky diode (SOD-123) Central CMHSH5-4 Not installed (SOD-123) Not installed, surface-mount LEDs 3-pin headers Not installed, PC board short 3.3H inductor Sumida CDRH6D38-3R3 4.2H inductor Sumida CDRH5D28-4R2 2H inductor TOKO A918CY-2R0M 1.4H inductor Sumida CDR43-1R4 or TOKO A918CY-1R5M Not installed N-channel MOSFET (6-pin SOT) Fairchild FDC637AN or International Rectifier IRLMS2002 N-channel MOSFETs (SOT23) Fairchild FDN337N Not installed (SOT23) 46.4k 1% resistor (0603) 26.1k 1% resistor (0603) 8.2k 5% resistor (0603) 10k 5% resistors (0603) Not installed, PC board shorts (0603) OUTSU OUTSD OUT1 LEDOUT+ to LEDOUTOUT3A OUT3B DESIGNATION QTY R7, R11, R13, R17, R18 R8 R9 R14 R15 R16 R19 R20 T1 0 1 1 1 1 0 1 1 1 DESCRIPTION Not installed (0603) 1M 1% resistor (0603) 90.9k 1% resistor (0603) 51k 5% resistor (0603) 2.2k 5% resistor (0603) 10k 5% resistor (0603), not installed 36.5k 1% resistor (0603) 33 5% resistor (0603) Transformer Sumida CLQ72 type, sample number 6333-T507 MAX1565ETJ (32-pin thin QFN 5mm x 5mm) Not installed (8-pin SOT23), MAX1801 Shunts MAX1565ETJ EV kit PC board
C14
1
C15 C16 D1, D2, D3, D5
0 0 4
D4 D6 D7-D10 JU1-JU8 JU9 L1 L2 L3
1 0 0 8 0 1 1 1
U1 U2 -- --
1 0 8 1
Table 1. Output Voltages and Maximum Currents
OUTPUT VOLTAGE (V) 3.35 1.5 5 16 (Note 2) 15 -7.5 (Note 3) MAXIMUM CURRENT (mA) 500 (Note 1) 350 500 15 20 30
L4 L5 N1
1 0 1
N2, N3 N4 R1 R2 R3 R4, R5 R6, R10, R12
2 0 1 1 1 2 0
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.
2
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MAX1565 Evaluation Kit
Detailed Description
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.
Evaluates: MAX1565
Table 2. Jumper Functions
JUMPER JU1 JU2 JU3 JU4 JU5 JU6 JU7 JU8 PINS 1 AND 2 All outputs are shut down OUTSD shut down OUT1 shut down LEDOUT shut down OUT1 set to 5V OUTSD set to 1.5V OUTSU set to 3.35V PINS 2 AND 3 OUTSU enabled OUTSD enabled OUT1 enabled LEDOUT enabled OUT1 adjustable OUTSD adjustable OUTSU adjustable
OUT3A/OUT3B shut down OUT3A/OUT3B enabled
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.
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.
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.
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.
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.
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.
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 10k and 100k. 4) Solve for R12: V R12 = R13 x OUTSU - 1 1.25 5) Install R12 and R13.
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 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
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MAX1565 Evaluation Kit Evaluates: MAX1565
3) Select a value for R11 between 10k and 100k. 4) Solve for R10: V R10 = R11 x OUTSD - 1 1.25 5) Install R10 and R11. 5) Choose a value for R15. The MAX1565 EV kit has a 2.2k resistor installed for R15. In most cases, it is not necessary to change R15. 6) Calculate the value for R14: R14 = n x VFMIN x R15
1.25 - ILED(MAX) x R20
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 10k and 100k. 4) Solve for R6: V R6 = R7 x OUT1 - 1 1.25 5) Install R6 and R7.
(
)
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 x + 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
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)
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 10k and 100k. 2) Solve for R8: V R8 = R9 x OUT3A - 1 1.25 3) Replace R8 and R9.
4
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MAX1565 Evaluation Kit
Table 3. Component Suppliers
SUPPLIER Central Semiconductor Fairchild Semiconductor International Rectifier Kamaya Murata Panasonic Sumida Taiyo Yuden TDK TOKO PHONE WEBSITE 631-435-1110 www.centralsemi.com -- www.fairchildsemi.com
Changing the Switching Frequency
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.
Evaluates: MAX1565
310-322-3331 www.irf.com 260-489-1533 www.kamaya.com 814-237-1431 www.murata.com 714-373-7939 www.panasonic.com 847-956-0666 www.sumida.com 408-573-4150 www.t-yuden.com 847-803-6100 www.component.tdk.com 847-297-0070 www.toko.com
Note: Please indicate that you are using the MAX1565 when contacting these component suppliers.
IN C17 10F C18 10F L3 2H C3 OUT1 +5V D1 C4 C5 C6A 10F C6B 10F N1 R6 SHORT C1 C2 R3 R4 R5 R1 R2 1 31 24 15 7 29 R7 OPEN 2 16 MAIN JU8 3 2 1 MAIN JU7 3 2 1 MAIN JU6 3 2 1 MAIN JU1 3 2 1 MAIN JU2 3 2 1 MAIN JU3 3 2 1 MAIN JU4 3 2 1 JU5 11 10 9 ON1 ON2 ON3 PGND 3 PGND 20 EP JU9 C12 0.1F REF C14 100pF OSC OSC REF GND 19 13 30 R19 36.5k 17 18 12 6 21 27 25 28 32 4 8 5 26 22 23 14 IN SDOK C11 47F D5 R12 SHORT OUTSU +3.35V 500mA C19 10F MAIN R11 OPEN DL2 FB2 L2 4.2H C9 10F C10 10F OUTSD +1.5V R10 350mA SHORT IN T1 L1 3.3H 1 7 4 D3 8 D2 C7 1F C8 1F R8 1M OUT3A +15V 20mA OUT3B -7.5V 30mA
COMP1 COMP2 COMP3 COMPSU COMPSD DL1 FB1 FBSELSU FBSELSD FBSEL1 ONSU ONSD
LXSU DL3 FB3 DL2
N3
6 R9 90.9k
U1 MAX1565
FB2 LXSD FBSD INSD OUTSU OUTSU SDOK FBSU
MAIN 3 2 1
R13 OPEN
Figure 1. MAX1565 EV Kit Schematic (Sheet 1 of 2) _______________________________________________________________________________________ 5
MAX1565 Evaluation Kit Evaluates: MAX1565
L5 OPEN OUT4 +7V C16 OPEN D6
OSC
N4 R17 OPEN
U2
8 6 DL FB COMP GND
MAX1801 OSC
REF IN DCON
1 3 MAIN 7 4 REF
IN R18 OPEN L4 1.4H D4 DL2 N2 C13 1F R14 51k
R16 OPEN C15 OPEN
5 2
LEDOUT+
GND
F82
D7 OPEN D8 OPEN D9 OPEN
R15 2.2k
R20 33
D10 OPEN
LEDOUT-
Figure 2. MAX1565 EV Kit Schematic (Sheet 2 of 2)
1.0"
1.0"
Figure 3. MAX1565 EV Kit Component Placement Guide-- Component Side 6
Figure 4. MAX1565 EV Kit Component Placement Guide-- Solder Side
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MAX1565 Evaluation Kit Evaluates: MAX1565
1.0"
1.0"
Figure 5. MAX1565 EV Kit PC Board Layout--Component Side
Figure 6. MAX1565 EV Kit PC Board Layout--Inner Layer 2
1.0"
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 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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