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19-3601; Rev 0; 4/05
MAX8576 Evaluation Kit
General Description
The MAX8576 evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX8576 and MAX8578 hysteretic, synchronous step-down DCDC converters. The MAX8576 circuit generates a 1.8V output voltage at load currents up to 12A from a 10.8V to 13.2V input voltage range. The MAX8578 circuit uses an all-ceramic capacitor solution to generate a 1.8V output voltage at load currents up to 5A from a 10.8V to 13.2V input voltage with VCC supply from an additional 4.5V to 5.5V supply. The MAX8576 circuit switches at approximately 300kHz, and the MAX8578 circuit switches at approximately 500kHz. Both devices have up to 93% efficiency with the supplied components. The MAX8576 EV kit also evaluates the MAX8577 and MAX8579. To evaluate the MAX8577 or MAX8579, order a free sample along with this EV kit.
Features
10.8V to 13.2V Supply Voltage Range with 4.5V to 5.5V VCC Supply Voltage Range 1.2% Accurate Over Temperature Adjustable Output Voltage Down to 0.6V 300kHz and 500kHz Switching Frequency Lossless Peak Current Sensing Monotonic Startup into Prebias Output (MAX8576/MAX8578) Startup Overvoltage Protection (MAX8577/MAX8579) Enable/Shutdown Fully Assembled and Tested
Evaluates: MAX8576-MAX8579
Ordering Information
PART TEMP RANGE 0C to +70C IC PACKAGE 10 MAX(R) MAX8576EVKIT
MAX is a registered trademark of Maxim Integrated Products, Inc.
MAX8576 Component List
DESIGNATION C1, C2 QTY 2 DESCRIPTION 470F, 35V aluminum electrolytic capacitors Sanyo 35MV470WX 10F 10%, 25V X5S ceramic capacitor (1206) Taiyo Yuden TMK316C106KL 0.01F 20%, 10V X7R ceramic capacitor (0603) Kemet C0603C103M8RAC 1F 20%, 35V X7R ceramic capacitor (1206) Taiyo Yuden GMK316BJ105ML 4.7F 20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ475MG 0.1F 20%, 10V X7R ceramic capacitors (0603) Kemet C0603C104M8RAC 0.027F 10%, 50V X7R ceramic capacitor (0603) Kemet C0603C273K5RAC 2200F, 6.3V aluminum electrolytic capacitors Rubycon 6.3MBZ2200M10X20 DESIGNATION C11 QTY 1 DESCRIPTION 0.01F 20%, 25V X5R ceramic capacitor (0603) Kemet C0603C103M3PAC 3300pF 20%, 6.3V X7R ceramic capacitor (0603) Kemet C0603C332M9RAC 100V, 250mA high-speed diode Philips BAS316 (SOD-323) 3-pin header 1.8H, 14A, 3.48m inductor Panasonic ETQP2H1R8BFA 30V, 12.5m (max) n-channel MOSFET (SO-8) International Rectifier IRF7821 30V, 3.7m (max) n-channel MOSFET (SO-8) International Rectifier IRF7832 n-channel MOSFET, 2N7002 (SOT23) 6.04k 1% resistor (0603) 5.11k 1% resistor (0603) 12.4k 1% resistor (0603) 1k 5% resistor (0603)
C3
1
C13 D1 JU1 L1 N1
1 1 1 1 1
C4
1
C5
1
C6
1
C7, C12
1
N2 N3 R1 R2 R3 R4
1 1 1 1 1 1
C8
1
C9, C10
2
________________________________________________________________ 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.
MAX8576 Evaluation Kit Evaluates: MAX8576-MAX8579
MAX8576 Component List (continued)
DESIGNATION R5 R6 R7 R8 U1 None QTY 1 1 1 0 1 1 DESCRIPTION 20k 5% resistor (0603) 2 5% resistor (0603) 10 5% resistor (0402) Not installed, shorted on PC board (0402) MAX8576EUB (10-pin MAX) Shunt (position 2) N5 R9 R10 R11 R12 R13 U2 None None 1 1 1 1 1 0 1 1 1
MAX8578 Component List
DESIGNATION N4 QTY 1 DESCRIPTION 30V, 18m (max) n-channel MOSFET (SO-8) International Rectifier IRF7807Z 30V, 12.5m (max) n-channel MOSFET (SO-8) International Rectifier IRF7821 6.04k 1% resistor (0603) 2.49k 1% resistor (0603) 12.4k 1% resistor (0603) 2 5% resistor (0603) Not installed, shorted on PC board, resistor (0402) MAX8578EUB (10-pin MAX) Shunt (position 2) MAX8576 EV kit PC board
MAX8578 Component List
DESIGNATION C14 QTY 1 DESCRIPTION 10F 20%, 25V X5R ceramic capacitor (1210) Taiyo Yuden TMK325BJ106MM 1F 20%, 25V X7R ceramic capacitor (1206) TDK C3216X7R1E105M 4700pF 20%, 10V X7R ceramic capacitor (0603) Kemet C0603C472M8RAC 4.7F 20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ475MG 0.1F 20%, 10V X7R ceramic capacitor (0603) Kemet C0603C104M8RAC 0.01F 20%, 25V X7R ceramic capacitor (0603) Kemet C0603C103M3RAC 47F 20%, 6.3V, ESR = 5m, X5R ceramic capacitor (1812) Taiyo Yuden JMK432BJ476MM 0.01F 20%, 25V X5R ceramic capacitor (0603) Kemet C0603C103M3PAC Not installed (optional, 47F 20%, 6.3V, ESR = 5m, X5R ceramic capacitor) (1812) Taiyo Yuden JMK432BJ476MM 1000pF 20%, 25V X5R ceramic capacitor (0603) Kemet C0603C102M3PAC 100V, 250mA high-speed diode Philips BAS316 (SOD-323) 3-pin header 2.2H, 7.3A, 9.8m inductor Sumida CDEP104L-2R2
C15
1
Quick Start
Recommended Equipment
* One variable-DC power supply capable of supplying up to 13.2V at 3.5A * One variable-DC power supply capable of supplying up to 5V at 100mA * Digital multimeter (DMM) * 5A load * 12A load * Ammeter (optional)
C16
1
C17
1
C18
1
C19
1
Procedure (MAX8576)
The MAX8576 EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Preset the variable-DC power supply to 12V. Turn off the power supply. Do not turn on the power supply until all connections are complete. 2) Connect the positive lead of the 12V power supply to the VIN pad on the EV kit and connect the negative lead of the power supply to the GND pad on the EV kit. 3) Connect the positive lead of the DMM to the VOUT pad on the EV kit and connect the negative lead of the DMM to the GND pad on the EV kit. 4) Turn on the power supply. 5) Verify the voltage at VOUT is 1.8V 5%. 6) Connect a 12A load between VOUT and GND. 7) Verify that the voltage at VOUT is 1.8V 5%.
C20
1
C21
1
C22
0
C23 D2 JU2 L2
1 1 1 1
2
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MAX8576 Evaluation Kit
Component Suppliers
SUPPLIER Central Semiconductor International Rectifier Kemet Panasonic Philips Rubycon Sanyo Sumida Taiyo Yuden TDK PHONE 631-435-1110 800-341-0392 864-963-6300 402-564-3131 800-447-1500 408-467-3864 619-661-6835 847-956-0666 408-573-4150 888-835-6646 www.centralsemi.com www.irf.com www.kemet.com www.panasonic.com www.semicondcutors.philips.com www.rubycon.com www.sanyo.com www.sumida.com www.t-yuden.com www.component.tdk.com WEBSITE
Evaluates: MAX8576-MAX8579
Note: Indicate that you are using the MAX8576 when contacting these suppliers.
Procedure (MAX8578)
Follow the steps below to verify board operation: 1) Preset the variable-DC power supplies to 12V and 5V. Turn off the power supplies. Do not turn on the power supplies until all connections are complete. 2) Connect the positive lead of the 5V power supply to the VCC1 pad on the EV kit, and connect the negative lead of the power supply to the GND1 pad on the EV kit. 3) Connect the positive lead of the 12V power supply to the VIN1 pad on the EV kit, and connect the negative lead of the power supply to the GND1 pad on the EV kit. 4) Connect the positive lead of the DMM to the VOUT1 pad on the EV kit, and connect the negative lead of the DMM to the GND1 pad on the EV kit. 5) Turn on the 12V supply. 6) 7) 8) 9) Turn on the 5V supply. Verify the voltage at VOUT1 is 1.8V 5%. Connect a 5A load between VOUT1 and GND1. Verify that the voltage at VOUT1 is 1.8V 5%.
where RDC is the resistance of the inductor. Refer to the MAX8576 data sheet for information on selecting the inductor, output capacitor, and feed-forward capacitor to optimize the circuit for different output voltages. For the MAX8578 circuit, R11 can be calculated using the same method.
Higher Input/Output Voltages
The MAX8576 and MAX8578 circuits are targeted for 10.8V to 13.2V input voltages and 1.8V output voltages. However, the 9V to 24V input voltage range and an output voltage up to 0.9 x VIN is possible for IC evaluation. 30V rated MOSFETs must be installed if the input voltage is raised above 16V. Ensure that input and output capacitor voltage ratings are sufficient for the new operating voltages.
Jumper Settings
Jumper JU1 Function
The MAX8576 circuit features an output shutdown mode. To shut down the output, place a shunt between pins 2 and 3 on JU1. For normal operation remove the shunt or place it on pins 1 and 2 of JU1 (default position).
Detailed Description
Evaluating Other Output Voltages
Both circuits come preset to a 1.8V output voltage. The output voltage of the MAX8576 is adjustable down to 0.6V and up to 0.9 x VIN. To adjust the output voltage, place a 1% resistor at R3 with a value corresponding to the equation: + 0.01 + (0.5 x R DC x IOUTMAX ) V R3 = 6040 x OUT - 1 0.59
Jumper JU2 Function
The MAX8578 circuit features an output shutdown mode. To shut down the output, place a shunt between pins 1 and 2 on JU2. For normal operation remove the shunt or place it on pins 2 and 3 of JU2 (default position).
Evaluating the MAX8577/MAX8579
To evaluate the MAX8577, carefully remove the MAX8576 and install the MAX8577. To evaluate the MAX8579, carefully remove the MAX8578 and install the MAX8579. All other components can remain the same.
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Evaluates: MAX8576-MAX8579
MAX8576 Evaluation Kit
Figure 1. MAX8576 EV Kit Schematic
C1 C11 C2 R1 1 FB R2 C4 2 SS U1 C5 DH N1 L1 C7 5 DL C13 N2 R6 BST 6 GND 7 8 R3 R7 VOUT 1.8V/12A IN 9 C8 C12 C3 OCSET 10 3 VL N3 C6 4 GND LX
4
MAX8576 (MAX8577)
C9 C10 R8 PC SHORT D1 C14 C21 C15 R9 1 FB 9 SS U2 EN OCSET 10 R10 C16 2 C19 3 VCC C17 4 GND LX 7 C18 5 DL BST 6 C23 N5 R12
VIN 10.8V TO 13.2V
GND
VL
EN
3 2 1
R4
JU1
R5
VL
VIN1 10.8V TO 13.2V
GND1
VCC1
EN1
3 2
1
JU2
VCC1 DH
MAX8578 (MAX8579)
8
N4
R11 L2 VOUT1 1.8V/5A
5V
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C20 C22 OPEN GND1 R13 PC SHORT D2
MAX8576 Evaluation Kit Evaluates: MAX8576-MAX8579
Figure 2. MAX8576 EV Kit Component Placement Guide-- Component Side
Figure 3. MAX8576 EV Kit PC Board Layout--Component Side
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5
MAX8576 Evaluation Kit Evaluates: MAX8576-MAX8579
Figure 4. MAX8576 EV Kit PC Board Layout--Layer 2
Figure 5. MAX8576 EV Kit PC Board Layout--Layer 3
6
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MAX8576 Evaluation Kit Evaluates: MAX8576-MAX8579
Figure 6. MAX8576 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) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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