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19-3342; Rev 0; 7/04
MAX1567 Evaluation Kit
General Description
The MAX1567 evaluation kit (EV kit) is a fully assembled and tested circuit that accepts 2.8V to 4.2V input voltages and provides all the output voltages required for a typical digital still camera. The outputs consist of the main step-down output (3.3V), a step-down output (1.8V), a general-purpose 5V output, outputs for driving white LED backlighting, and outputs for charge-coupled device (CCD) and LCD bias. The EV kit comes with the MAX1567 installed, but can also be used to evaluate the MAX1566. For applications with a lower battery voltage, such as 2-AA battery applications, another version of the EV kit is available with the main output configured as a step-up converter (MAX1567SUMEVKIT). Up to 95% Efficient 2.8V to 4.2V Input Voltage Range Main Step-Down Output, 3.3V Step-Down Output, 1.8V 5V General-Purpose Output CCD and LCD Bias Outputs (+15V/-7.5V) Current-Regulated Output with Overvoltage Protection for White LED Backlighting 1A Shutdown Mode Fully Assembled and Tested
Features
Evaluates: MAX1566/MAX1567
Ordering Information
PART MAX1567EV KIT TEMP RANGE 0C to +70C IC PACKAGE 40 Thin QFN 6mm x 6mm
Component List
DESIGNATION QTY DESCRIPTION 1F 10%, 25V X7R ceramic capacitors (1206) TDK C3216X7R1E105K Taiyo Yuden TMK316BJ105KL or equivalent 0.1F 10%, 16V X7R ceramic capacitor (0603) TDK C1608X7R1C104K Taiyo Yuden EMK107BJ104KA or equivalent 100pF 5%, 50V C0G ceramic capacitor (0603) TDK C1608C0G1H101J or equivalent 6800pF 10%, 25V X7R ceramic capacitor (0402) TDK C1005X7R1E682K Taiyo Yuden TMK105BJ682KV or equivalent 3300pF 10%, 50V X7R ceramic capacitors (0402) TDK C1005X7R1H332K Taiyo Yuden UMK105BJ332KV or equivalent DESIGNATION QTY DESCRIPTION 0.01F 10%, 25V X7R ceramic capacitors (0402) TDK C1005X7R1E103K Taiyo Yuden TMK105BJ103KV or equivalent 2200pF 10%, 50V X7R ceramic capacitor (0402) TDK C1005X7R1H222K Taiyo Yuden UMK105BJ222KV or equivalent 47F 20%, 6.3V X5R ceramic capacitor (1812) Taiyo Yuden JMK432BJ476MM or equivalent Not installed, capacitor (0805) 22F 20%, 6.3V X5R ceramic capacitors (1210) Taiyo Yuden JMK325BJ226MM TDK C3225X5R0J226M 10F 20%, 6.3V X5R ceramic capacitors (0805) Taiyo Yuden JMK212BJ106MG TDK C2012X5R0J106M or equivalent
C1, C18
2
C6, C9
2
C2
1
C8
1
C3
1
C10
1
C11
0
C4
1
C12, C14
2
C5, C7
2
C13, C15, C16
3
________________________________________________________________ Maxim Integrated Products
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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.
MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
Component List (continued)
DESIGNATION C17 C19 C20 D1, D6, D7, D10 D2-D5 D8, D9 D11 JU1-JU6 JU7, JU9, JU10, JU13, JU15 JU8, JU11, JU12, JU14 L1, L2 L3 L4 L5 L6 L7 QTY 1 0 0 4 4 0 1 6 0 0 2 1 1 1 1 0 DESCRIPTION 4.7F 20%, 10V X5R ceramic capacitor (0805) TDK C2012X5R1A475M or equivalent Not installed, capacitor (0805) Not installed, capacitor (1206) Schottky diodes, 20V, 500mA (SOD-123) Central CMHSH5-2L White LEDs Nichia NSCW215T Not installed, diodes (SOD-123) Schottky diode, 2A, 30V (SMA) Nihon EC21QS03 3-pin headers Not installed, jumpers cut here--short Not installed, jumpers cut here--open 4.7H inductors Sumida CDRH2D18-4R7 22H inductor TOKO A921CY-220M (D63LCB family) 10H inductor Sumida CDRH8D28-100 10H inductor Sumida CDRH5D28-100 22H inductor Sumida CDRH5D28-220 Not installed, inductor DESIGNATION N1, N2 N3 P1 R1 R2, R12, R14, R16, R18, R20 R3 R4, R5 R6 R7 R8 R9, R22, R23 R10 R11, R21 R13 R15 R17 R19 R24-R29 R30, R31 T1 U1 None None QTY 2 0 1 1 6 1 2 1 1 1 3 1 2 1 1 1 1 0 0 0 1 6 1 DESCRIPTION n-channel MOSFETs (SOT23) Fairchild FDN361AN Not installed, n-channel MOSFET (SOT23) p-channel MOSFET (SOT23) Fairchild FDN360P 1.1M 5% resistor (0603) 90.9k 1% resistors (0603) 10 5% resistor (0603) 51k 5% resistors (0603) 33k 5% resistor (0603) 22k 5% resistor (0603) 60.4k 1% resistor (0603) 100k 5% resistors (0603) 16.2k 5% resistor (0603) 1M 1% resistors (0603) 549k 1% resistor (0603) 274k 1% resistor (0603) 150k 1% resistor (0603) 40.2k 1% resistor (0603) Not installed, resistors (1206) Not installed, resistors (0603) Not installed, transformer MAX1567ETL (40-pin thin QFN 6mm x 6mm) Shunts, 2 position MAX1567EVKIT PC board
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MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
Quick Start
Recommended Equipment
* * * Power supply capable of supplying 2.8V to 4.2V at 2A Voltmeter Load resistors or electronic loads
Table 1. Output Voltages and Maximum Currents
OUTPUT VSU VM VSD OUT1A OUT2 LEDOUT+ to LEDOUTVOLTAGE (V) 5 3.3 1.8 15 -7.5 16 max (Note 2) MAXIMUM CURRENT (mA) 500 (Note 1) 600 350 40 -80 20
Procedure
Follow the steps below to verify operation of the MAX1567 EV kit: 1) 2) Preset the power supply to between 2.8V and 4.2V. Turn off the power supply. Do not turn on the power supply until all connections are completed. Connect the power-supply positive lead to the pad on the EV kit board labeled BATT. Connect the power-supply ground lead to the pad on the EV kit board labeled GND. Connect loads from the outputs VM, VSD, OUT1A, and OUT2 to GND. See Table 1 for maximum load currents. Short pins 2-3 of JU1 to enable VSU. Short pins 1-2 of JU2-JU6 to disable all other outputs. Turn on the power supply. Verify the VSU voltage (5V) using a voltmeter. If desired, connect a load from VSU to GND. To verify other outputs, move jumpers JU2-JU6 to short pins 2 and 3 to enable corresponding outputs, and verify the output voltage with a voltmeter (see Table 1).
3) 4) 5)
Note 1: If VSU and VM are operating, subtract about 70% of the VM load current from the maximum load capability of VSU. Note 2: The LED outputs are current regulated to 20mA with overvoltage protection set to 16V.
Main Step-Down Output (VM)
The main step-down output is set to 3.3V. To enable VM, short pins 2-3 of jumper JU2. To shut down VM, short pins 1-2 of JU2.
6) 7) 8) 9) 10) 11)
Step-Down Output (VSD)
The step-down output (VSD) is set to 1.8V. To enable VSD, short pins 2-3 of jumper JU3. To shut down OUTSD, short pins 1-2 of JU3.
Step-Down OK (SDOK)
The step-down OK output (SDOK) is an open-drain output that is pulled low when the step-down converter has completed soft-start. For more details on SDOK, refer to the MAX1567 data sheet.
Auxiliary Output 1 OK (AUX1OK)
AUX1OK is an open-drain output that goes low when OUT1 has successfully completed soft-start. AUX1OK goes high impedance in shutdown, overload, and thermal limit.
Detailed Description
Step-Up Output (VSU)
The main step-up output (VSU) powers the internal circuitry of the MAX1567 and must reach its regulation voltage (5V) before any other output can turn on. To enable VSU, short pins 2-3 of jumper JU1. When jumper JU1 is on pins 1-2, all outputs shut down and the IC is in low-current shutdown mode.
CCD/LCD Bias Outputs (OUT1A, OUT1B)
The output OUT1A provides a regulated +15V output. To enable OUT1A, short pins 2-3 of JU5. To turn off OUT1A, short pins 1-2 of JU5. In the standard configuration, OUT1A and OUT2 provide the +15V and -7.5V bias voltages for CCD and LCD. OUT1B is not used in the standard configuration of the EV kit. Outputs OUT1A and OUT1B can be configured to use a flyback transformer to provide both the +15V (OUT1A) and -7.5V (OUT1B) necessary for CCD and LCD bias. This is useful when using the MAX1566 where OUT2 is configured as a boost converter. See the Flyback Transformer Configuration for OUT1A/OUT1B section.
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Short-Circuit Flag (SCF)
SCF is an open-drain output that is high impedance when overload protection occurs. Under normal operation SCF pulls low. In the default configuration, there is a 100k pullup resistor (R23) from SCF to the input of the main converter.
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MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
Inverter Output (OUT2)
OUT2 is a regulated -7.5V output. To enable OUT2, connect pins 2-3 of jumper JU6. To shut down OUT2, connect pins 1-2 of JU6. OUT2 can also be configured as a boost output when evaluating the MAX1566. See the Evaluating the MAX1566 section.
Table 2. Jumper Functions
JUMPER JU1 JU2 JU3 JU4 JU5 JU6 SHORT PINS 1-2 VM shut down VSD shut down LEDs (OUT3+/OUT3-) shut down OUT1 shut down OUT2 shut down SHORT PINS 2-3 VM enabled VSD enabled LEDs (OUT3+/OUT3-) enabled OUT1 enabled OUT2 enabled All outputs are shut down VSU enabled
LED Outputs (OUT3+, OUT3-)
Outputs OUT3+ and OUT3- are for driving a series of white LEDs for backlighting. The EV kit comes with four surface-mount white LEDs installed and is configured to drive the LEDs at a regulated 20mA. To protect against an open LED string, the overvoltage protection sets the maximum output voltage to 16V. To evaluate with fewer than four LEDs, short the pads of the unused LEDs. To use LEDs other than the ones mounted on the board, break the string by removing one of the LEDs on the board, then connect a series array consisting of two to six white LEDs in series to the OUT3+ and OUT3- outputs. The anode side of the array connects to OUT3+ and the cathode side connects to OUT3-. To enable the LED outputs, short pins 2-3 of JU4. To turn the LED outputs off, short pins 1-2 of JU4. To adjust the LED brightness or overvoltage protection, see the Adjusting the LED Brightness section.
V R15 = R16 x VSU - 1 1.25V 3) Install resistors R15 and R16. Note that if the input voltage is greater than what VSU is set to, then VSU will rise above its regulation voltage.
Configuring the Main Step-Down Output (VM)
The input to the main step-down converter is connected to VSU by default. To change this connection to BATT, cut the trace shorting JU15 and short JU14. The main step-down output (VM) is adjustable from 1.25V to VSU using the following procedure: 1) 2) Select a value for R18 between 10k and 100k. Solve for R17 using: V R17 = R18 x VM - 1 1.25V 3) Install resistors R17 and R18.
Customizing the MAX1567 Evaluation Kit
Adjusting the Step-Up Output (VSU)
The step-up output (VSU) is adjustable from 2.7V to 5.5V using the following procedure: 1) 2) Select a value for R16 between 10k and 100k. Solve for R15 using:
Table 3. PC Board Jumper Functions
JUMPER JU7 JU8 JU9 JU10 JU11 JU12 JU13 JU14 JU15 DEFAULT SHORT OPEN SHORT SHORT OPEN OPEN SHORT OPEN SHORT FUNCTION Selects the input power for the OUT2 converter. Short only one of these jumpers. Short JU7 to connect the OUT2 input power to BATT, or short JU8 to connect to VSU. Connects the ground planes together. This must remain shorted for proper circuit operation. Selects the input power for the step-down converter. Short only one of these jumpers. Short JU10 to connect the step-down input power to BATT, short JU11 for VSU, or short JU12 for VM. Selects topology for OUT1A/OUT1B. Short for OUT1A step-up, or open for OUT1A/OUT1B transformer flyback. Selects the input power for the main step-down converter. Short only one of these jumpers. Short JU14 to connect the input of VM to BATT, or short JU15 for VSU.
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MAX1567 Evaluation Kit
Configuring the Step-Down Output (VSD)
The input to the step-down converter (PVSD) on the EV kit comes connected to BATT, but the connection can be changed to either VM or VSU. To use VM as the input to the step-down converter, cut the trace shorting JU10 and short the pads of JU12. To use VSU as the input to the step-down converter, cut the trace shorting JU10, and short the pads of JU11. Make sure one and only one of JU10, JU11, and JU12 is shorted. The step-down output voltage (VSD) is adjustable from 1.25V to VBATT using the following procedure: 1) 2) Select a value for R20 between 10k and 100k. Solve for R19 using: V R19 = R20 x VSD - 1 1.25V 3) Install resistors R19 and R20.
Adjusting the LED Brightness
Resistor R3 sets the regulation current of the LEDs as follows: R3 = 0.2V ILED
Evaluates: MAX1566/MAX1567
The overvoltage-protection threshold for the LEDs is also adjustable. To ensure the LEDs are current regulated, this threshold (VOVP) must be set higher than the maximum forward-voltage drop of the LED string. VOVP should be set lower than the maximum voltage ratings of the capacitor, diode, and MOSFET (C1, D1, and N1) used in the LED driver circuit. Use the following procedure to set the overvoltage protection: 1) 2) Select a value for R1 between 10k and 100k. Solve for R2 using: V R1 = R2 x OVP - 1 1.25V 3) Install resistors R1 and R2.
Adjusting the OUT1A Voltage
OUT1A can be set to a voltage above 1.25V. The upper limit depends on the ratings of the external components. Note that if the input voltage is greater than what OUT1A is set to, then OUT1A will rise above its regulation voltage. Use the following procedure to set VOUT1A: 1) 2) Select a value for R12 between 10k and 100k. Solve for R11 using: V R11 = R12 x OUT1A - 1 1.25V 3) Install resistors R11 and R12.
Changing the Switching Frequency
The switching frequency of the MAX1567 is adjustable. Typically, frequencies from 400kHz to 500kHz provide a good compromise between efficiency and component size. To change the frequency, replace C3 and R4. Refer to the MAX1566/MAX1567 data sheet for information on selecting values for these components.
Evaluating the MAX1566
To evaluate the MAX1566, first carefully remove U1 and replace it with the MAX1566. Free samples of the MAX1566 can be obtained from Maxim. The MAX1566 requires that OUT2 be configured as a boost converter.
Configuring the Inverting Output (OUT2)
The input to the inverter is normally connected to BATT. To change this connection to VSU, cut the trace shorting JU7 and short the pads of JU8. Note that the lower limit of inverter operation, when powered from BATT, depends on the external p-channel MOSFET threshold voltage. To adjust the OUT2 voltage, use the following procedure: 1) 2) Select a value for R13 between 10k and 100k. Solve for R14 using: V R13 = R14 x - OUT2 1.25V 3) Install resistors R13 and R14.
Configuring OUT2 as a Boost Converter
To configure OUT2 as a boost converter, remove components C17, R13, R14, D7, and P1. Then add components C19, R30, R31, D8, L7, and N3. Refer to the MAX1566/MAX1567 data sheet for information on component selection. Table 4 shows typical components for generating +15V at up to 20mA.
Flyback Transformer Configuration for OUT1A/OUT1B
OUT1 can be configured to provide two outputs using a transformer. This is usually done to generate CCD/LCD bias when using the MAX1566. To use a transformer, remove L2 and cut the trace shorting JU13. Install the transformer on the footprint (T1) that overlaps L2 and JU13. Refer to the MAX1566/MAX1567 data sheet for details on component selection. Table 5 shows typical
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MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
Table 4. Typical Components for OUT2 Boost Circuit
DESIGNATION QTY C19 R30 R31 L7 D8 N3 1 1 1 1 1 1 DESCRIPTION 1F 10%, 25V X7R ceramic capacitor (0805) TDK C2012X7R1E105K 1M 1% resistor (0603) 90.9k 1% resistor (0603) 1.5H inductor Sumida CDRH3D16-1R5 Schottky diode, 40V, 500mA (SOD-123) Central CMHSH5-4 n-channel MOSFET (SOT23) Fairchild FDN337N
Component Suppliers
SUPPLIER Central Semiconductor Fairchild Semiconductor International Rectifier Kamaya Murata Panasonic Sumida Taiyo Yuden TDK TOKO Vishay PHONE WEBSITE 631-435-1110 www.centralsemi.com 408-721-2181 www.fairchildsemi.com 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 402-563-6866 www.vishay.com
Table 5. Typical Components for OUT1A/OUT1B Transformer Circuit
DESIGNATION QTY C18, C20 R11 R12 T1 D6 D9 N2 2 1 1 1 1 1 1 DESCRIPTION 1F 10%, 25V X7R ceramic capacitors (1206) TDK C3216X7R1E105K 1M 1% resistor (0603) 90.9k 1% resistor (0603) Transformer TDK LDT565630T-MX1 Schottky diode, 40V, 500mA (SOD-123) Central CMHSH5-4 Schottky diode, 20V, 500mA (SOD-123) Central CMHSH5-2L n-channel MOSFET (SOT23) Fairchild FDN337N
Note: Indicate you are using the MAX1567 when contacting these suppliers.
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MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
L1 4.7H C15 10F 3 N1 D3 R1 1.1M 2 1 D4 R2 90.9k 39 C2 0.1F VSU REF R3 10 BATT 32 1 32 1 GND 32 1 32 1 32 1 32 1 BATT BATT C4 6800pF C5 3300pF C6 0.01F C7 3300pF C8 2200pF C9 0.01F R5 51k R6 33k R7 22k R8 60.4k R9 100k R10 16.2k 22 R4 51k C3 100pF 18 JU1 JU2 JU3 JU4 JU5 JU6 14 8 40 4 29 11 OSC 15 1 35 DL3
BATT
LEDOUT+ C1 1F
D1
C16 10F
D2
U1 MAX1567
DL1
36
DL1
BATT
VSU
FB3H FB3L REF
FB1 INDL2 DL2
3 32 34
JU7 FB1 SHORT
JU8 OPEN
D5 LEDOUT-
DL2 L3 22H FB2
P1
OUT2 OUT2
FB2
31
D7
C17 4.7F
R26
-7.5V R27
ONSU ONM ONSD ON3 ON1 ON2 SUSD
GND PV PVSU LXSU PGSU FBSU
33 37 25 24 23 17 D10 L4 10H R14 90.9k R13 549k REF BATT R15 274k JU15 SHORT C10 47F D11 BATT R16 90.9k R23 100k C11 OPEN L5 10H C12 22F BATT SCF JU14 OPEN VSU VSU +5V
PVM
28
16
CCSU
SCF LXM PGM FBM PVSD LXSD
19 27 26 13 7 6
10
CCSD
VM +3.3V
VSU
12
CCM
R17 150k
VSU
AUX1OK
R22 100k
38
R18 90.9k
CC3
JU10 SHORT
JU11 OPEN
JU12 OPEN
2
CC1
VSU
30
L6 22H R19 40.2k R20 90.9k C14 22F
C13 10F VSD +1.8V
CC2
R21 1M SDOK
20 21
AUX1OK SDOK EP
FBSD PGSD
9 5 JU9 SHORT
Figure 1. MAX1567 EV Kit Schematic (Sheet 1 of 2) _______________________________________________________________________________________ 7
MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
BATT
L7 D8 OUT2 N3 DL2 FB2 R31 R30 C19 OPEN
JU13 SHORT FB1 L2 4.7H R12 90.9k 2 1 7 8 3 5 6 4 3 1 DL1 N2 2 R28 R29 -7.5V T1 D6
BATT
R11 1M OUT1A C18 1F C20 OPEN OUT1B +15V R24 R25
D9
Figure 2. MAX1567 EV Kit Schematic (Sheet 2 of 2)
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MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
Figure 3. MAX1567 EV Kit Component Placement--Component Side
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MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
Figure 4. MAX1567 EV Kit Component Placement--Solder Side 10 ______________________________________________________________________________________
MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
Figure 5. MAX1567 EV Kit PC Board Layout--Component Side
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MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
Figure 6. MAX1567 EV Kit PC Board Layout--Inner Layer 2 12 ______________________________________________________________________________________
MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
Figure 7. MAX1567 EV Kit PC Board Layout--Inner Layer 3
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MAX1567 Evaluation Kit Evaluates: MAX1566/MAX1567
Figure 8. MAX1567 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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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