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19-3230; Rev 0; 3/04
MAX1585 Evaluation Kit
General Description
The MAX1585 evaluation kit is a fully assembled and tested circuit that accepts input voltages of 2.8V to 5V and provides all the output voltages required for a typical digital still camera. The outputs consist of the main step-up output (5V), a step-down output (1.5V), a general-purpose 3.3V output, +15V and -7.5V outputs for charge-coupled device (CCD) and LCD bias, and an optional general-purpose output using the MAX1801 slave controller.
Features
Up to 95% Efficiency 2.8V to 5V Input Voltage Range Main Step-Up Output, 5V or Adjustable Step-Down Output, 1.5V or Adjustable 5V General-Purpose Output CCD and LCD Bias Outputs (+15V/-7.5V) 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: MAX1584/MAX1585
Ordering Information
PART MAX1585EVKIT TEMP RANGE IC PACKAGE 0C to +70C 32 Thin QFN 5mm x 5mm
Component List
DESIGNATION QTY C1 1 DESCRIPTION 0.01F 10%, 16V X7R ceramic capacitor (0402) TDK C1005X7R1E103K or equivalent 4700pF 10%, 25V X7R ceramic capacitor (0402) TDK C1005X7R1E472K Taiyo Yuden TMK105BJ472KV or equivalent 1500pF 10%, 50V X7R ceramic capacitors (0402) TDK C1005X7R1H152K Taiyo Yuden UMK105BJ152KV or equivalent 470pF 10%, 50V X7R ceramic capacitor (0402) Murata GRP155R71H471K or equivalent 4.7F 20%, 25V X5R ceramic capacitor (1210) Taiyo Yuden TMK325BJ475MN Not installed (1210) 4.7F 20%, 10V X5R ceramic capacitor (1206) Taiyo Yuden LMK316BJ475ML 10F 20%, 6.3V X5R ceramic capacitors (0805) Panasonic ECJ2FB0J106M or Taiyo Yuden JMK212BJ106MG C23 1 DESIGNATION QTY C11, C13 2 DESCRIPTION 47F 20%, 6.3V X5R ceramic capacitors (1812) Taiyo Yuden JMK432BJ476MM 0.1F 10%, 16V X7R ceramic capacitor (0603) Taiyo Yuden EMK107BJ104KA or equivalent 330pF 5%, 50V C0G ceramic capacitor (0603) Murata GRM1885C1H331J Not installed (0402) Not installed (0805) 560pF 10%, 50V X7R ceramic capacitor (0402) Murata GRP155R71H561K Not installed 15pF 5%, 50V C0G ceramic capacitor (0402) Murata GRP1555C1H150J or equivalent 1F 20%, 10V X5R ceramic capacitor (0603) Taiyo Yuden JMK107BJ105MA Schottky diodes 500mA (SOD-123) Central CMHSH5-2L or IRF MBR0520 Schottky diode 2.0A, 30V (SMA) Nihon EC21QS03L
C2
1
C12
1
C14 C15 C16 C20
1 0 0 1
C3, C5
2
C4
1
C6 C7, C21 C8
1 0 1
C22
0
C9, C10, C17, C18, C19, C24, C27
D1, D2, D3
3
7
D4
1
________________________________________________________________ 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.
MAX1585 Evaluation Kit Evaluates: MAX1584/MAX1585
Component List (continued)
DESIGNATION QTY D5, D7 D6 JU1-JU5 JU6, JU8, JU10, JU11, JU13, JU15 JU7, JU9, JU12, JU14, JU16 L1 L2 L3 L4 L5, L7 L6 N1 N2 N3 P1, P2 0 0 5 0 DESCRIPTION Not installed (SOD-123) Not installed (SOD-123) Schottky diode 0.5A, 60V Nihon EP05Q06 3-pin headers Not installed Cut here--short Not installed Cut here--open 5.0H inductor Sumida CDRH6D38-5R0 22H inductor Sumida CDRH5D28-220 2.0H inductor Sumida CDRH4D28-2R0 10H inductor Sumida CDRH5D28-100 Not installed 3.6H inductor (D63LCB) TOKO A921CY-3R6M n-channel MOSFET (SOT23) Fairchild FDN337 Not installed (6-pin SOT) Not installed (SOT23) p-channel MOSFETs (SOT23) Fairchild FDN360P DESIGNATION QTY P3, P4 R1 R2 R3 R4 R5 R6 R7, R11, R13 0 R8 R9 R10, R15 R12 R14 R16, R17, R18, R21, R23, R24, R25, R26 R19 R20 R22 T1 0 1 1 1 1 1 1 3 1 1 2 1 1 0 1 1 1 0 DESCRIPTION Not installed (SOT23) 33.2k 1% resistor (0603) 40.2k 1% resistor (0603) 150k 1% resistor (0603) 61.9k 1% resistor (0603) 100k 5% resistor (0603) 1M 1% resistor (0603) 90.9k 1% resistors (0603) 562k 1% resistor (0603) 93.1k 1% resistor (0603) 18.2k 1% resistors (0603) 274k 1% resistor (0603) 30.1k 1% resistor (0603) Not installed (0603) 20k 1% resistor (0603) 1M 5% resistor (0603) 1.21k 1% resistor (0603) Not installed (CLQ72) transformer Sumida sample number: 6333-T500 MAX1585ETJ (32-pin thin QFN 5mm x 5mm) Not installed (8-pin SOT23) Shunts, 2-position MAX1585 EV kit PC board
1 1 1 1 0 1 1 0 0 2
U1 U2 None None
1 0 5 1
Component Suppliers
SUPPLIER Central Semiconductor Fairchild Semiconductor International Rectifier Kamaya Murata Panasonic Sumida Taiyo Yuden TDK TOKO Vishay PHONE 631-435-1110 408-721-2181 310-322-3331 260-489-1533 814-237-1431 714-373-7939 847-956-0666 408-573-4150 847-803-6100 847-297-0070 402-563-6866 WEBSITE www.centralsemi.com www.fairchildsemi.com www.irf.com www.kamaya.com www.murata.com www.panasonic.com www.sumida.com www.t-yuden.com www.component.tdk.com www.toko.com www.vishay.com
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MAX1585 Evaluation Kit
Quick Start
Required Equipment
* Power supply capable of supplying 5V at 3A * Voltmeter * Load resistors or electronic loads
Detailed Description
Main Step-Up Output (OUTSU)
The main output (OUTSU) powers the internal circuitry of the MAX1585 and must reach its regulation voltage before any other output turns on. To enable OUTSU, short pins 2-3 of jumper JU1. When JU1 pins 1-2 are shorted, all outputs shut down and the IC is in low-current shutdown mode. OUTSU is configured for 5V. If a different output voltage is desired, see the Adjusting the Main Step-Up Output Voltage section.
Evaluates: MAX1584/MAX1585
Procedure
Follow the steps below to verify operation of the MAX1585 EV kit: 1) Preset the power supply to between 2.8V and 5V. 2) Turn off the power supply. 3) Connect the power supply positive lead to IN. 4) Connect the power supply ground lead to GND. 5) Connect loads from the outputs OUTSD, OUT1, OUT2B, and OUT3 to GND. See Table 1 for maximum load currents. 6) Verify that jumper JU1 has pins 2 and 3 shorted (to enable the main step-up output). 7) Verify that jumpers JU2-JU5 have pins 1 and 2 shorted (to disable other outputs). 8) Turn on the power supply. 9) Verify the OUTSU voltage (5V) using a voltmeter. 10) Connect a load, if desired, from OUTSU to GND (see Table 1 for maximum load currents). 11) To verify other outputs, move jumpers JU2-JU5 to short pins 2 and 3 to enable corresponding output, and verify the output voltages with a voltmeter (see Table 2).
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 1M pullup resistor (R20) from SCF to OUTSU. SCF can be used to drive a high-side p-channel MOSFET switch that disconnects the load from OUTSU during power-up or when a channel turns off in response to a logic command or an overload. See the Optional OUTSU Load Disconnect section.
Step-Down Output (OUTSD)
The step-down output (OUTSD) is set to 1.5V. To enable OUTSD, short pins 2-3 of jumper JU2. To shut down OUTSD, short pins 1-2 of JU2. To adjust the OUTSD output voltage, see the Adjusting the StepDown Output Voltage section.
Step-Down OK (SDOK)
The step-down OK output (SDOK) is an open-drain output that pulls low after the step-down converter has successfully completed soft-start. SDOK goes high impedance in shutdown, overload, and thermal limit. For more details on SDOK, refer to the MAX1584/MAX1585 data sheet.
Table 1. Output Voltages and Maximum Currents
OUTPUT OUTSU OUTSD OUT1 OUT2B OUT3 VOLTAGE (V) 5.0 1.5 15.0 -7.5 3.3 MAXIMUM CURRENT (mA) 1000 (Note 1) 250 130 50 300
Auxiliary Output 1 (OUT1)
OUT1 is a regulated 15V output. To enable OUT1, connect pins 2-3 of jumper JU3. To shut down OUT1, short pins 1-2 of JU3. If an output voltage other than 15V is desired, see the Adjusting the OUT1 Voltage section.
Auxiliary Output 1 OK (AUX1OK)
AUX1OK is an open-drain output that pulls low when OUT1 has successfully completed soft-start. AUX1OK goes high impedance in shutdown, overload, and thermal limit.
Note 1: If OUT3 is operating and powered from OUTSU (JU8 shorted and JU7 open), subtract 70% of the OUT3 load current from the maximum load capability of OUTSU.
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MAX1585 Evaluation Kit Evaluates: MAX1584/MAX1585
Table 2. Jumper Functions
JUMPER JU1 JU2 JU3 JU4 JU5 SHORT PINS 1-2 All outputs are shut down OUTSD shut down OUT1 shut down OUT2 shut down OUT3 shut down SHORT PINS 2-3 OUTSU enabled OUTSD enabled OUT1 enabled OUT2 enabled OUT3 enabled
nent size. To change the frequency, replace C14 and R19. Refer to the MAX1584/MAX1585 data sheet for information on selecting values for these components.
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) Select a value for R13 between 10k and 100k. 2) Solve for R12 using: R12 = R13 [(VOUTSU / 1.25) - 1] 3) Replace R12 and R13 with the new value resistors. 4) For best performance, it may be necessary to change the inductor, output capacitor, and compensation components. Refer to the MAX1584/ MAX1585 data sheet.
Auxiliary Output 2 (OUT2B)
OUT2B is a regulated -7.5V output. To enable OUT2B, short pins 2-3 of JU4. To shut down OUT2B, short pins 1-2 of JU4. If a different output voltage is desired, see the Adjusting the OUT2B Voltage section. When using the MAX1584, auxiliary output 2 can be configured as a step-up converter (OUT2A) or as a transformer flyback circuit providing two outputs (OUT2A and OUT2B). See the Evaluating the MAX1584 section.
Optional OUTSU Load Disconnect
SCF can be used to drive a high-side p-channel MOSFET switch that disconnects the load from OUTSU during power-up or when a channel turns off in response to a logic command or an overload. To configure the EV kit for this feature, install p-channel MOSFET P3 and cut the trace shorting JU13. Similarly, AUX1OK can also drive a high-side p-channel MOSFET to disconnect the load from OUTSU when OUT1 is out of regulation. To utilize this feature, install p-channel MOSFET P3, cut the traces shorting JU11 and JU13, and short JU12.
Auxiliary Output 3 (OUT3)
OUT3 is a regulated 3.3V output. To enable OUT3, short pins 2-3 of JU5. To shut down OUT3, short pins 1-2 of JU5. If a different output voltage is desired, see the Adjusting the OUT3 Voltage section.
Customizing the MAX1585 Evaluation Kit
Changing the Switching Frequency
The switching frequency of the MAX1585 is adjustable. Typically, frequencies from 400kHz to 600kHz provide a good compromise between efficiency and compo-
Table 3. PC Board Jumper Functions
JUMPER JU6 JU7 JU8 JU9 JU10 JU11 JU12 JU13 JU14 JU15 JU16 DEFAULT Short Open Short Open Short Short Open Short Open Short Open FUNCTION Connects the ground planes together. This must remain shorted for proper circuit operation. Select the input power for the auxiliary 3 converter. Short only one of these jumpers. Short JU7 to connect the auxiliary 3 input power to IN, or short JU8 to connect to OUTSU. Select the input power for the step-down converter. Short only one of these jumpers. Short JU9 to connect the step-down input power to OUTSU, or short JU10 to connect to IN. Select which signal controls the optional power sequencing of OUTSU. JU11 is for SCF and JU12 is for AUX1OK. Short only one of these jumpers. See the Optional OUTSU Load Disconnect section. Shorts the optional MOSFET that controls power sequencing for OUTSU. Open JU13 and install P3 if OUTSU power sequencing is used; otherwise, leave JU13 shorted. See the Optional OUTSU Load Disconnect section. Allow the CC3 compensation components to be connected to either ground (JU14) or FB3 (JU15). Short only one of these jumpers. Selects topology for auxiliary output 2 with the MAX1584. Short for step-up, or leave open for transformer flyback. See the Evaluating the MAX1584 section.
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MAX1585 Evaluation Kit
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) Select a value for R11 between 10k and 100k. 2) Solve for R10 using: R10 = R11 [(VOUTSD / 1.25) - 1] 3) Replace R10 and R11 with the new value resistors. 4) For best performance, it may be necessary to change the inductor, output capacitor, and compensation components. Refer to the MAX1584/ MAX1585 data sheet.
Adjusting the OUT3 Voltage
The output voltage of OUT3 is preset to 3.3V but is adjustable to voltages greater than 1.25V by changing two resistors. Note that if the input voltage is greater than the regulation voltage for OUT3, OUT3 will rise above its regulation voltage by one diode drop lower than the input voltage. To select OUT3 voltage-setting resistors, refer to the MAX1584/MAX1585 data sheet.
Evaluates: MAX1584/MAX1585
Optional Auxiliary Controller 3 Power Sequencing (OUT3SW)
The OUT3SW output optionally switches to OUT3 after the step-down converter has powered up. To use OUT3SW, install P4 and R2. OUT3SW power sequencing is controlled by SDOK.
Adjusting the OUT1 Voltage
The output voltage of OUT1 is preset to 15V, but is adjustable to voltages greater than 1.25V by changing two resistors. Note that if the input voltage is greater than the regulation voltage for OUT1, VOUT1 will rise above its regulation voltage to one diode drop lower than the input voltage. Use the following procedure to set VOUT1: 1) Select a value for R7 between 10k and 100k. 2) Solve for R6 using: R6 = R7 [(VOUT1 / 1.25) - 1] 3) Replace R6 and R7 with the new value resistors. 4) For best performance, it may be necessary to change the inductor, output capacitor, and compensation components. Refer to the MAX1584/ MAX1585 data sheet.
Optional Step-Up Controller (OUT4)
A MAX1801 step-up slave controller can be used with the MAX1585 EV kit to generate an additional output. To use this feature, install a MAX1801 in U2 on the solder side of the PC board. Free samples of the MAX1801 can be obtained from Maxim. Also install components N4, D6, L5, C15, C16, R16, R17, and R18. Refer to the MAX1801 data sheet for information on selecting these components.
Evaluating the MAX1584
The MAX1584 can be evaluated on the MAX1585 evaluation kit with auxiliary controller 2 configured as either a step-up converter or transformer flyback. To evaluate the MAX1584, carefully remove the IC and replace with the MAX1584. Then remove the components used in the MAX1585's auxiliary 2 inverter (P1, D2, L6, R8, R9, and C8). If using auxiliary 2 as a step-up, short JU16. Make sure JU16 is open if using a transformer. Finally install the components for the desired configuration of auxiliary 2. Refer to the MAX1584/MAX1585 data sheet for information on component selection.
Adjusting the OUT2B Voltage
OUT2B is a negative voltage that is adjusted using two resistors. Use the following procedure to set VOUT2B: 1) Select a value for R9 between 10k and 100k. 2) Solve for R8 using: R8 = R9 (-VOUT2B / 1.25) 3) Replace R8 and R9 with the new value resistors. 4) For best performance, it may be necessary to change the inductor, output capacitor, and compensation components. Refer to the MAX1584/ MAX1585 data sheet.
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Evaluates: MAX1584/MAX1585
MAX1585 Evaluation Kit
PGNDA
PGNDB
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IN C3 1500pF R3 150k C24 10F 1 CC1 L1 5H P1 OUT2B D2 L6 3.6H D2 FB2 D3 REF FB3 L2 22H C9 10F C10 10F C27 10F OUTSD R9 93.1k R8 562k OUT2B -7.5V 80mA C8 4.7F C22 15pF JU15 SHORT C4 470pF R4 61.9k 31 CC3 IND2 D2 FB2 D3 FB3 LXSD FBSD PVSD PV PVSU FBSU OSC REF ON2 GND EP 30 ON3 14 19 13 22 C11 47F D4 OSC IN REF R19 MAIN 20k 3 20 C12 0.1F JU6 SHORT C14 330pF R12 274k 26 5 C19 10F 8 JU9 OPEN MAIN JU10 SHORT IN MAIN R11 90.9k 4 32 28 23 27 CC2 CCSU CCSD D1 FB1 AUX10K SDOK SCF ONSU ONSD ON1 JU14 OPEN
Figure 1. MAX1585 EV Kit Schematic (Sheet 1 of 2)
U1 MAX1585
25 LXSU 21 3 1 24 15 7 29 2 AUX1OK 16 17 18 12 6 9 10 11 SDOK SCF MAIN 2 R1 33.2k R2 40.2k N1 C2 4700pF C1 0.01F C5 1500pF R5 100k +1.5V R10 250mA 18.2k 3 JU1 2 MAIN 1 3 JU2 2 MAIN 1 3 JU3 2 MAIN 1 3 JU4 2 MAIN 1 3 JU5 2 1 R13 90.9k
6
IN
L3 FB3 2.0H
OUT1
D1
+15V 130mA
C6 4.7F
R6 1M
R7 90.9k
AUX1OK
SDOK
SCF
MAX1585 Evaluation Kit Evaluates: MAX1584/MAX1585
L5 IN OUT4 C17 10F C18 10F D5 2 N3 C16 R17 R18 R16 2 1 8 6 R22 JU8 SHORT JU7 OPEN C23 SCF D3 P2 L4 10H C13 47F FB3 C15 R15 18.2k R14 30.1k C20 2 GND DCON 4 5 DL FB COMP
U2 MAX1801
OSC REF IN
1 3 MAIN 7
OSC REF
MAIN
PGND OUT3 +3.3V 300mA OUT3SW
D3
R21 SDOK L7 JU16 OPEN IN 2 1 T1 C21 7 D2 3 4 N2 3 4 6 C7 D7 8 D6
P4 MAIN R26 FB2 R25 OUT2A R20 1M R23 JU11 SHORT R24 OUT2B SCF AUX1OK JU12 OPEN P3 JU13 SHORT OUTSU
1 256
Figure 1. MAX1585 EV Kit Schematic (Sheet 2 of 2)
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MAX1585 Evaluation Kit Evaluates: MAX1584/MAX1585
Figure 2. MAX1585 EV Kit Component Placement--Component Side
Figure 3. MAX1585 EV Kit Component Placement--Solder Side
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MAX1585 Evaluation Kit Evaluates: MAX1584/MAX1585
Figure 4. MAX1585 EV Kit PC Board Layout--Component Side
Figure 5. MAX1585 EV Kit PC Board Layout--Inner Layer 2
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MAX1585 Evaluation Kit Evaluates: MAX1584/MAX1585
Figure 6. MAX1585 EV Kit PC Board Layout--Inner Layer 3
Figure 7. MAX1585 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.
10 ____________________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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