19-3601; Rev 1; 8/06
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 DC-
DC 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 V
CC
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 V
CC
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
0°C to +70°C
IC PACKAGE
10 µMAX
®
MAX8576EVKIT
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX8576 Component List
DESIGNATION
C1, C2
QTY
2
DESCRIPTION
470µF, 35V aluminum electrolytic
capacitors
Sanyo 35MV470WX
10µF ±10%, 25V X5S ceramic
capacitor (1206)
Taiyo Yuden TMK316C106KL
0.01µF ±20%, 10V X7R ceramic
capacitor (0603)
Kemet C0603C103M8RAC
1µF ±20%, 35V X7R ceramic
capacitor (1206)
Taiyo Yuden GMK316BJ105ML
4.7µF ±20%, 6.3V X5R ceramic
capacitor (0805)
Taiyo Yuden JMK212BJ475MG
0.1µF ±20%, 10V X7R ceramic
capacitors (0603)
Kemet C0603C104M8RAC
0.027µF ±10%, 50V X7R ceramic
capacitor (0603)
Kemet C0603C273K5RAC
2200µF, 6.3V aluminum electrolytic
capacitors
Rubycon 6.3MBZ2200M10X20
DESIGNATION
C11
QTY
1
DESCRIPTION
0.01µF ±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
1.8µH, 14A, 3.48mΩ inductor
Panasonic ETQP2H1R8BFA
30V, 12.5mΩ (max) n-channel
MOSFET (SO-8)
International Rectifier IRF7821
30V, 3.7mΩ (max) n-channel
MOSFET (SO-8)
International Rectifier IRF7832
n-channel MOSFET, 2N7002 (SOT23)
6.04kΩ ±1% resistor (0603)
5.11kΩ ±1% resistor (0603)
12.4kΩ ±1% resistor (0603)
1kΩ ±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
1
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
20kΩ ±5% resistor (0603)
2Ω ±5% resistor (0603)
10Ω ±5% resistor (0402)
Not installed, shorted on PC board
(0402)
MAX8576EUB (10-pin µMAX)
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, 18mΩ (max) n-channel MOSFET
(SO-8)
International Rectifier IRF7807Z
30V, 12.5mΩ (max) n-channel
MOSFET (SO-8)
International Rectifier IRF7821
6.04kΩ ±1% resistor (0603)
2.49kΩ ±1% resistor (0603)
12.4kΩ ±1% resistor (0603)
2Ω ±5% resistor (0603)
Not installed, shorted on PC board,
resistor (0402)
MAX8578EUB (10-pin µMAX)
Shunt (position 2)
MAX8576 EV kit PC board
MAX8578 Component List
DESIGNATION
C14
QTY
1
DESCRIPTION
10µF ±20%, 25V X5R ceramic
capacitor (1210)
Taiyo Yuden TMK325BJ106MM
1µF ±20%, 25V X7R ceramic
capacitor (1206)
TDK C3216X7R1E105M
4700pF ±20%, 10V X7R ceramic
capacitor (0603)
Kemet C0603C472M8RAC
4.7µF ±20%, 6.3V X5R ceramic
capacitor (0805)
Taiyo Yuden JMK212BJ475MG
0.1µF ±20%, 10V X7R ceramic
capacitor (0603)
Kemet C0603C104M8RAC
0.01µF ±20%, 25V X7R ceramic
capacitor (0603)
Kemet C0603C103M3RAC
47µF ±20%, 6.3V, ESR = 5mΩ, X5R
ceramic capacitor (1812)
Taiyo Yuden JMK432BJ476MM
0.01µF ±20%, 25V X5R ceramic
capacitor (0603)
Kemet C0603C103M3PAC
Not installed (optional, 47µF ±20%,
6.3V, ESR = 5mΩ, 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
2.2µH, 7.3A, 9.8mΩ 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 sup-
ply 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 nega-
tive 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
_______________________________________________________________________________________
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.semiconductors.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 nega-
tive 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 nega-
tive 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) Turn on the 5V supply.
7) Verify the voltage at VOUT1 is 1.8V ±5%.
8) Connect a 5A load between VOUT1 and GND1.
9) Verify that the voltage at VOUT1 is 1.8V ±5%.
where R
DC
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 out-
put voltage up to 0.9 x V
IN
is possible for IC evaluation.
30V rated MOSFETs must be installed if the input volt-
age 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 V
IN
. To adjust the output voltage, place a
±1% resistor at R3 with a value corresponding to the
equation:
+
0.01
+
(0.5
×
R
DC
×
I
OUTMAX
)
⎞
⎛
V
R3
=
6040
×
⎜
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.
_______________________________________________________________________________________
3
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
V
CC
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
_______________________________________________________________________________________
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
_______________________________________________________________________________________
5
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