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19-3352; Rev 0; 7/04
MAX8544 Evaluation Kit
General Description
The MAX8544 evaluation kit (EV kit) contains a fully assembled and tested circuit using the MAX8544 stepdown controller. The MAX8544 circuit is designed to operate from a 10.8V to 13.2V input and provide a 2.5V output at up to 15A. The EV kit contains a second circuit (not populated) for evaluating the MAX8543. By changing the appropriate external components, both circuits can be configured to operate with input voltages from 3V to 13.2V and provide an output that is adjustable from 0.8V to (0.9 x VIN). Up to 15A Output Current Capability 10.8V to 13.2V Input Voltage Range Prebias Startup Lossless Inductor Current Sensing Enable Input Adjustable Soft-Start Overvoltage Protection
Features
Evaluates: MAX8543/MAX8544
Selectable Latch-Off or Automatic Recovery Fully Assembled and Tested
Ordering Information
PART MAX8544EVKIT TEMP RANGE 0C to +70C IC PACKAGE 20 QSOP
Component List
MAX8544 Circuit
DESIGNATION QTY DESCRIPTION 1F 10%, 25V X7R ceramic capacitor (1206) Panasonic ECJ3YB1E105K Taiyo Yuden TMK316BJ105KL TDK C3216X7R1E105K 0.1F 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H104K Taiyo Yuden UMK107BJ104KA 180F, 4V, 10m aluminum polymer SPCAPs Panasonic EEFUE0G181XR 0.47F 10%, 10V X7R ceramic capacitors (0603) TDK C1608X7R1A474K 10F 20%, 16V X5R ceramic capacitors (1206) Panasonic ECJ3YB1C106M TDK C3216X5R1C106M 0.22F 10%, 10V X7R ceramic capacitor (0603) Taiyo Yuden LMK107BJ224KA TDK C1608X7R1A224K DESIGNATION C22 QTY 1 DESCRIPTION 220pF 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H221K 10pF 5%, 50V C0G ceramic capacitor (0603) TDK C1608C0G1H100J 470F 20%, 16V aluminum electrolytic (E) capacitor Rubycon 16MBZ470M Not installed (0603) 10F 20%, 6.3V X5R ceramic capacitor (0805) Panasonic ECJ2FB0J106M Taiyo-Yuden JMK212BJ106MG TDK C2012X5R0J106M Not installed (1206) 100pF 5%, 50V C0G ceramic capacitor (0603) TDK C1608C0G1H101J Schottky diode, 100mA, 30V (SOT323) Central CMSSH-3
C13
1
C23
1
C14
1
C26 C27, C29, C37, C38
1 0
C15, C16
2
C17, C39
2
C28
1
C32 C33
0 1
C18, C19, C20
3
C21
1
D3
1
________________________________________________________________ Maxim Integrated Products
1
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MAX8544 Evaluation Kit Evaluates: MAX8543/MAX8544
Component List (continued)
MAX8544 Circuit
DESIGNATION D4 JU4-JU7 L2 N5, N6 N7, N8 R10, R20 R12 R13 QTY 1 4 1 2 2 0 0 1 DESCRIPTION Switching diode, 250mA, 100V (SOT23) Central CMPD914 3-pin headers 0.82H inductor Vishay IHLP-5050FD-01 .82H n-channel MOSFETs International Rectifier IRF7821 n-channel MOSFETs International Rectifier IRF7832 Not installed (0805) Not installed (2512) PC board short 17.4k 1% resistor (0603) DESIGNATION R14 R15 R16 R17, R18 R19 R21, R24 R22 R23 R27, R30 R31 U2 -- -- QTY 1 1 1 2 1 2 1 1 0 0 1 4 1 DESCRIPTION 8.06k 1% resistor (0603) 90.9k 1% resistor (0603) 9.31k 1% resistor (0603) 1.3k 5% resistors (0603) 42.2k 1% resistor (0603) 100k 5% resistors (0603) 200k 5% resistor (0603) 220k 5% resistor (0603) Not installed (0603) Not installed (0603) PC board short MAX8544EEP Shunts MAX8544EVKIT PC board
Component List
Optional MAX8543 Circuit
DESIGNATION C1, C2 QTY 0 DESCRIPTION 180F, 4V, 10m aluminum polymer SPCAPs Panasonic EEFUE0G181XR 0.47F 10%, 10V X7R ceramic capacitors (0603) TDK C1608X7R1A474K 0.1F 10% 50V X7R ceramic capacitor (0603) TDK C1608X7R1H104K Taiyo Yuden UMK107BJ104KA 10F 20% 16V X5R ceramic capacitors (1206) Panasonic ECJ3YB1C106M TDK C3216X5R1C106M 1F 10% 25V X7R ceramic capacitor (1206) Panasonic ECJ3YB1E105K Taiyo Yuden TMK316BJ105KL TDK C3216X7R1E105K 0.22F 10%, 10V X7R ceramic capacitor (0603) Taiyo Yuden LMK107BJ224KA TDK C1608X7R1A224K DESIGNATION C11 QTY 0 DESCRIPTION 12pF 5%, 50V C0G ceramic capacitor (0603) TDK C1608C0G1H120J 220pF 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H221K 470F 20%, 6.3V POSCAP Sanyo 6TPB470M Not installed (0603) 10F 20%, 6.3V X5R ceramic capacitor (0805) Panasonic ECJ2FB0J106M Taiyo-Yuden JMK212BJ106MG TDK C2012X5R0J106M 100pF 5%, 50V C0G ceramic capacitor (0603) TDK C1608C0G1H101J Schottky diode, 100mA, 30V (SOT323) Central CMSSH-3 Switching diode, 250mA,100V (SOT23) Central CMPD914
C3, C40
0
C12
0
C24 C25, C31, C35, C36
0 0
C4
0
C5-C8
0
C30
0
C34
0
C9
0
D1
0
C10
0
D2
0
2
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MAX8544 Evaluation Kit
Component List (continued)
Optional MAX8543 Circuit
DESIGNATION JU1, JU2, JU3 L1 N1, N2 N3, N4 R1 R2 R3 R4, R5 QTY 0 0 0 0 0 0 0 0 DESCRIPTION 3-pin headers 0.33H inductor Coilcraft DO3316P-331HC n-channel MOSFETs Vishay Si4866DY n-channel MOSFETs Vishay Si4866DY 17.4k 1% resistor (0603) 8.06k 1% resistor (0603) Not installed (2512) PC board short 680 5% resistors (0603) DESIGNATION R6 R7 R8 R9, R25 R11 R26 R28, R29 U1 -- QTY 0 0 0 0 0 0 0 0 0 DESCRIPTION 53.6k 1% resistor (0603) 100k 5% resistor (0603) 200k 5% resistor (0603) Not installed (0805) 150k 5% resistor (0603) Not installed (0603) Not installed (0603) PC board short MAX8543EEE Shunts
Evaluates: MAX8543/MAX8544
Detailed Description Quick Start
Recommended Equipment
* * * Power supply capable of supplying 10.8V to 13.2V at 4A Load (up to 15A) Voltmeter
Enable/Shutdown
To enable the MAX8544 (MAX8543), short pins 2-3 of JU4 (JU1). To place the MAX8544 (MAX8543) in lowpower shutdown mode, short pins 1-2 of JU4 (JU1) (see Table 1).
Setting the Peak Current-Limit Threshold Procedure
The MAX8544 circuit is designed to operate with a 50mV peak current-limit threshold (JU5 and JU6 pins 1-2 shorted). JU5 and JU6 set the peak current-limit threshold as shown in Table 2. However, for proper operation, it is necessary to change some of the external components when changing the current limit. The MAX8543 circuit works similarly, but uses JU2 and JU3 for peak current-limit threshold programming. Refer to the MAX8543/MAX8544 data sheet for information on component selection.
The MAX8544 EV kit is fully assembled and tested. Follow these steps to verify board operation: 1) Preset the power supply to between 10.8V and 13.2V. Turn off the power supply. Do not turn on the power supply until all connections are completed. 2) Connect the positive power-supply lead to the EV kit terminal labeled IN2. 3) Connect the negative power-supply lead to the EV kit terminal labeled PGND2. 4) Connect the load (up to 15A) and voltmeter between the OUT2 and PGND2 terminals of the EV kit. 5) Verify that jumper JU4 is shorted across pins 2-3 (enable). 6) Verify that jumpers JU5 and JU6 are shorted across pins 1-2 (sets the current limit to 50mV). 7) Turn on the power supply. 8) Verify that the voltmeter reads 2.5V 2%.
Selecting the Current-Limit Mode
Use JU7 to select the circuit behavior following an overcurrent condition (valley current limit exceeded). Short pins 1-2 of JU7 to automatically recover after the fault condition is removed, or short pins 2-3 to latch the part off as soon as the fault occurs (see Table 3). To restart the circuit after it latches off, either cycle the input supply off then on, or move JU4 to short pins 1-2, then back to pins 2-3. Refer to the MAX8543/MAX8544 data sheet for details of valley current limit and mode operation.
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MAX8544 Evaluation Kit Evaluates: MAX8543/MAX8544
Table 1. JU1, JU4 Enable/Shutdown Selection
JUMPER POSITION 1-2 2-3 FUNCTION Shutdown Enable
Changing the Switching Frequency
The switching frequency is adjustable by changing R19 (R6). Note that the EV kit circuit is optimized for 600kHz (500kHz) operation. When changing the switching frequency, it is necessary to also change other components to obtain the best performance. Refer to the MAX8543/MAX8544 data sheet for information on calculating the value for R19 (R6) and selection of other components.
Table 2. JU2, JU3, JU5, and JU6 Peak Current-Limit Threshold Select
JU2/JU5 POSITION 1-2 1-2 2-3 2-3 JU3/JU6 POSITION 1-2 2-3 1-2 2-3 CURRENT-LIMIT THRESHOLD 50mV 100mV 150mV 200mV
Changing the Input Voltage Range
Although the MAX8544 EV kit is optimized for operation from a 10.8V to 13.2V input supply, it can be configured to operate with supplies from 3V to 13.2V by changing external components. Refer to the MAX8543/MAX8544 data sheet for information on component selection. When operating the EV kit from a supply of less than 5.5V, bypass the VL regulator by shorting the pads of R30.
Setting the Output Voltage
The voltage-divider resistors R13 (R1) and R14 (R2) set the output voltage of the MAX8544 (MAX8543) circuit. Select a value for R14 (R2) between 8k and 14k, then solve for R13 (R1) from the following equation: V R13 = R14 x OUT - 1 VFB where VFB is 0.8V. Refer to the MAX8543/MAX8544 data sheet for selecting output inductor, capacitor, and compensation components for optimized performance. If foldback current limit is used, the values of the current-limit threshold setting resistors must also be recalculated.
Table 3. JU7 Current-Limit Mode
JU7 POSITION 1-2 2-3 CURRENT-LIMIT MODE Autorecover Latch-off
Power-OK (POK)
POK is an open-drain output on the MAX8544 that monitors the output voltage. When the output is above 91% of its nominal regulation voltage, POK is high impedance. When the output drops below 91% of its nominal regulation voltage, POK is pulled low. POK is also pulled low when the MAX8544 is shut down. To allow POK to be used as a logic-level output, a 100k pullup resistor from POK to VL is included in the EV kit.
Using a Current-Sense Resistor
To optimize efficiency, the MAX8544 EV kit is configured to use the inductor resistance for peak current sensing. For a more accurate current sense, use a current-sense resistor, R12 (R3), as the sensing element. When using the current-sense resistor, first cut the traces shorting R12 (R3) on the PC board and remove components R17 (R4), C17 (C3), C39 (C40), and R18 (R5). Refer to Figure 8 in the MAX8543/MAX8544 data sheet. Install the current-sense resistor (equivalent to R3 in Figure 8) into R12 (R3) on the EV kit. Install a resistor (equivalent to R4 in Figure 8) into C17 (C3) on the EV kit. Install a resistor and capacitor (equivalent to R5 and C10 in Figure 8) piggybacked into R27 (R26) on the EV kit. Finally, install a capacitor (equivalent to C9 in Figure 8) from the junction of C17 (C3) and R17 (R4) on the EV kit to the junction of the current-sense resistor and the output capacitors.
Synchronization
The MAX8544 (MAX8543) can be synchronized to an external clock by connecting the clock signal to the pad on the EV kit labeled SYNC_IN2 (SYNC_IN1). In addition, on the MAX8544 circuit, a synchronization output (SYNC_OUT) provides a clock signal that is 180 out-ofphase with the MAX8544 switching. This clock signal can be used to synchronize a second MAX8543/ MAX8544 controller 180 out-of-phase with the first. If an external clock is used, the clock duty cycle must be 50% for SYNC_OUT to be 180 out-of-phase.
4
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MAX8544 Evaluation Kit
Component Suppliers
SUPPLIER Central Semiconductor Coilcraft International Rectifier Kamaya Murata Panasonic Rubycon Sanyo Taiyo Yuden TDK Vishay PHONE 631-435-1110 847-639-6400 310-322-3331 260-489-1533 814-237-1431 714-373-7939 0265-72-7111 619-661-6835 408-573-4150 847-803-6100 402-564-3131 WEBSITE www.centralsemi.com www.coilcraft.com www.irf.com www.kamaya.com www.murata.com www.panasonic.com www.rubycon.co.jp www.sanyo.com www.t-yuden.com www.component.tdk.com www.vishay.com
Evaluating the MAX8543
An optional circuit layout is provided for evaluating the MAX8543. Typical components for this circuit are given in the Component List section. This circuit is designed for a 3V to 3.65V input and 2.5V output at up to 15A with a 500kHz switching frequency. To configure this circuit for different operating conditions, refer to the MAX8543/MAX8544 data sheet for component selection. If using this circuit with an input voltage greater than 5.5V, cut the trace shorting R29.
Evaluates: MAX8543/MAX8544
Note: Indicate that you are using the MAX8544 when contacting these component suppliers.
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5
Evaluates: MAX8543/MAX8544
MAX8544 Evaluation Kit
Figure 1. MAX8544 EV Kit MAX8544 Schematic
IN2 IN2 VL2 R31 SHORT 15 IN REF C14 0.1F N5 L2 0.82H R12 SHORT C16 180F C15 180F C27 OPEN R17 1.3k PGND R10 OPEN C17 0.47F C39 0.47F R27 OPEN R18 1.3k 9 ILIM1 POK C37 OPEN ILIM2 1 C38 OPEN FB 5 11 R22 200k 12 N6 2 GND DH LX N7 13 DL N8 16 COMP 17 4 R20 OPEN BST 18 OUT2 VL 14 D3 GND2 3 R19 42.2k C21 0.22F C23 C22 10pF 220pF R23 220k 19 FSYNC MAX8544 EN 6 C28 10F C29 OPEN R30 OPEN C18 10F C26 470F C19 10F C20 10F C32 OPEN GND2 C13 1F
6
U2
R13 17.4k R15 90.9k 20 SYNCO CS+ C33 100pF 10 MODE CS7 8 R14 8.06k R16 9.31k JU6 2 1 VL2 3 R24 100k
SYNC_IN2
D4
IN2
3
EN2
JU4 2
1
SYNC_OUT
VL2
JU7 2
3
1
VL2
R21 VL2 100k
JU5 2
3
1
_______________________________________________________________________________________
POK
IN1 IN1
SYNC_IN1 12 IN FSYNC C4 0.1F N1 L1 0.33H R3 SHORT N2 2 REF DH LX N3 10 N4 13 C1 180F GND COMP 1 3 14 R25 OPEN BST 15 VL D1 GND1 16 R6 53.6k C10 0.22F 11 C31 OPEN
C9 1F
R28 SHORT
R29 SHORT C30 10F
VL1
C5 10F C24 470F
C6 10F
C7 10F
C8 10F
GND1
Figure 2. MAX8544 EV Kit Optional MAX8543 Schematic
OUT1 C2 180F C11 C12 12pF 220pF
D2
IN1
U1
DL C25 OPEN R4 680 PGND R9 OPEN 9 C3 0.47F
R1 17.4k
MAX8543
5 EN
3 1 8 ILIM CS+ C34 100pF 4 FB C35 OPEN CS6 C36 OPEN 7
EN1
JU1 2
R11 150k
C40 0.47F R26 OPEN R5 680
R2 8.06k
VL1 3 1
R7 VL1 100k JU3 2
R8 200k
Evaluates: MAX8543/MAX8544
_______________________________________________________________________________________
JU2 2
3
1
MAX8544 Evaluation Kit
7
MAX8544 Evaluation Kit Evaluates: MAX8543/MAX8544
Figure 3. MAX8544 EV Kit Component Placement Guide--Component Side
Figure 4. MAX8544 EV Kit PC Board Layout--Component Side 8 _______________________________________________________________________________________
MAX8544 Evaluation Kit Evaluates: MAX8543/MAX8544
Figure 5. MAX8544 EV Kit PC Board Layout--Layer 2
Figure 6. MAX8544 EV Kit PC Board Layout--Layer 3 _______________________________________________________________________________________ 9
MAX8544 Evaluation Kit Evaluates: MAX8543/MAX8544
Figure 7. MAX8544 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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