19-5149; Rev 0; 1/10
MAX15049 Evaluation Kit
General Description
The MAX15049 evaluation kit (EV kit) is a fully assembled
and tested PCB that demonstrates the capabilities of
the MAX15049. The MAX15049 is a high-performance,
triple-output synchronous buck controller with sequenc-
ing capability. The EV kit requires a 5V to 16V (12V, typ)
DC input-voltage range for normal operation.
The MAX15049 EV kit outputs are configured for 3.3V,
1.8V, and 1.2V. They provide a load current of 3A, 3A,
and 6A, respectively. The EV kit’s switching frequency
is set to 500kHz, but can be programmed up to 1.2MHz
by replacing a resistor. The EV kit comes configured
for sequencing (MAX15049) and is capable of prebias
startup. The EV kit can also be used to evaluate the
MAX15048 for tracking applications by changing a few
components. The PGOOD logic signal output pad is
provided for circuit monitoring.
The MAX15049 EV kit comes with a MAX15049ETJ+
installed. To evaluate the MAX15048, contact the factory
for samples of the pin-compatible MAX15048ETJ+.
S
Triple-Output Power Supply
Features
VOUT1 (3.3V, 3A)
VOUT2 (1.8V, 3A)
VOUT3 (1.2V, 6A)
S
5.5V to 16V Input-Voltage Operation (Design
Evaluates: MAX15048/MAX15049
Optimized for 12V Input)
S
Optional 4.5V to 5.5V Input-Voltage Operation
S
500kHz Switching Frequency per Converter
S
Programmable Switching Frequency Up to 1.2MHz
S
Sequencing Operation (Tracking Possible with
Component Changes)
S
PGOOD Power Monitoring
S
Small 1.5in x 1in Circuit Footprint
S
92.8% Peak Efficiency for OUT1
S
Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX15049EVKIT+
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
C1, C8, C9,
C18, C19, C38
QTY
6
DESCRIPTION
22FF
Q20%,
16V X5R ceramic
capacitors (1206)
Murata GRM31CR61C226M
1FF
Q10%,
16V X5R ceramic
capacitor (0603)
Murata GRM188R61C105K
0.1FF
Q10%,
16V X5R ceramic
capacitors (0402)
Murata GRM155R61A104K
10FF
Q10%,
16V X5R ceramic
capacitors (0805)
Murata GRM21BR61C106K
0.1FF
Q10%,
16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
330pF
Q5%
50V C0G ceramic
capacitors (0402)
Murata GRM1555C1H331J
DESIGNATION
C12, C23, C30
QTY
3
DESCRIPTION
22pF
Q5%,
50V C0G ceramic
capacitors (0402)
Murata GRM1555C1H220J
1500pF
Q10%,
50V X7R
ceramic capacitors (0402)
Murata GRM155R71H152K
Not installed, ceramic
capacitors (0402)
100FF
Q20%,
6.3V X5R ceramic
capacitors (1210)
Murata GRM32ER60J107M
220pF
Q10%,
10V X7R ceramic
capacitor (0402)
Murata GRM155R61A103K
680pF
Q10%,
50V X7R ceramic
capacitor (0402)
Murata GRM155R71H681K
C2
C5, C7, C15,
C17, C25, C26,
C35
C6, C16
1
C13, C21, C32
3
7
C14, C24
0
C27, C28
2
2
C29
1
C10, C20
2
C31
1
C11, C22
2
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX15049 Evaluation Kit
Evaluates: MAX15048/MAX15049
Component List (continued)
DESIGNATION
C33
QTY
1
DESCRIPTION
1FF
Q10%,
6.3V X5R ceramic
capacitor (0402)
Murata GRM155R60J105K
2.2FF
Q20%,
6.3V X5R ceramic
capacitor (0402)
Murata GRM155R60J225M
1000pF
Q10%,
50V X7R
ceramic capacitors (0402)
Murata GRM155R71H102K
1-pin headers
Not installed, 2-pin header
3.3FH, 7A, 26mI inductors
Vishay IHLP2525CZER3R3M07
1FH, 14.1A, 7.1mI inductor
TDK SPM6530T-1R0M120
30V dual n-channel
PowerTrench MOSFETs (MLP)
Fairchild FDMC8200
9.1A/11A, 30V dual n-channel
MOSFET (SO8)
International Rectifier
IRF7907PbF
DESIGNATION
R1, R7, R13
R2, R8, R19
R3, R9, R16,
R18
R4, R10, R17
R5, R11
R6
R12
R14
R15
6
0
2
1
R20
R21
R22
R23, R24, R28
R25
R26
R27
R29
U1
QTY
3
0
4
3
2
1
1
1
1
1
1
1
3
1
1
1
0
1
DESCRIPTION
0I
Q5%
resistors (0402)
Not installed, resistors (0402)
24.9kI
Q1%
resistors (0402)
15kI
Q1%
resistors (0402)
1kI
Q1%
resistors (0402)
5.49kI
Q1%
resistor (0402)
12.4kI
Q1%
resistor (0402)
20I
Q5%
resistor (0402)
499I
Q1%
resistor (0402)
2.2I
Q5%
resistor (0402)
39.2kI
Q1%
resistor (0402)
20kI
Q5%
resistor (0402)
10kI
Q1%
resistors (0402)
4.99kI
Q1%
resistor (0402)
2.49kI
Q1%
resistor (0402)
59kI
Q1%
resistor (0402)
Not installed, resistor (0603)
Triple-output buck controller
(32 TQFN–EP*)
Maxim MAX15049ETJ+
PCB: MAX15049 EVALUATION
KIT+
C34
1
C36, C37, C39
EN1, EN2, EN3,
PGOOD, REG,
SGND
JU1
L1, L2
L3
3
N1, N2
2
N3
1
—
*EP
= Exposed pad.
1
Component Suppliers
SUPPLIER
Fairchild Semiconductor
International Rectifier
Murata Electronics North America, Inc.
TDK Corp.
Vishay
PHONE
888-522-5372
310-322-3331
770-436-1300
847-803-6100
402-563-6866
www.irf.com
www.murata-northamerica.com
www.component.tdk.com
www.vishay.com
WEBSITE
www.fairchildsemi.com
Note:
Indicate that you are using the MAX15049 when contacting these component suppliers.
2
______________________________________________________________________________________
MAX15049 Evaluation Kit
Evaluates: MAX15048/MAX15049
Quick Start
•
•
•
MAX15049 EV kit
12V, 10A power supply
Four voltmeters
Detailed Description of Hardware
The MAX15049 EV kit is a fully assembled and tested
PCB that demonstrates the MAX15049, which inte-
grates three high-performance PWM switching step-
down DC-DC controllers. The EV kit circuit operates over
the input-voltage range of 4.7V to 16V. The three outputs
are configured for 3.3V, 1.8V, and 1.2V and can provide
3A, 3A, and 6A, respectively. The EV kit outputs operate
in sequencing mode during startup and the three outputs
operate 120 degrees out of phase. The EV kit outputs
can start into prebiased loads. The EV kit switching fre-
quency is set to 500kHz with resistor R21. The switching
frequency can be programmed from 200kHz to 1.2MHz
by replacing this resistor. The EV kit has a PGOOD out-
put pad to indicate that all outputs have reached their
steady-state values. The EV kit PCB is designed in four
layers and 2oz copper for optimum performance.
The MAX15049 EV kit is configured for normal operation
with an input power source of 4.7V to 16V and design
optimized for a 12V input voltage. The upper input-
voltage limit can be raised to 23V by replacing capaci-
tors C1, C2, C6, C16, and C38 with higher voltage-rated
capacitors. The EV kit circuit requires a minimum 4.7V
input voltage to start the power MOSFET switching.
The MAX15049 EV kit features an option to select the
bias input for the MAX15049 when configuring the EV kit
to operate with an input source less than 4.7V. Jumper
JU1 shorts the input-voltage source for the MAX15049 to
the controller REG pin. Without JU1 installed, the input-
voltage range in this configuration is 4.7V to 16V.
When operating the MAX15049 EV kit with a supply
between 4.5V to 5.5V, install jumper JU1.
Required Equipment
The MAX15049 EV kit is fully assembled and
tested. Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1)
2)
Verify that U1 is installed on the bottom side of the
PCB.
Connect the positive terminal of voltmeter 1 (VM1)
to the OUT1 pad. Connect the negative terminal of
VM1 to the GND1 pad.
Connect the positive terminal of voltmeter 2 (VM2)
to the OUT2 pad. Connect the negative terminal of
VM2 to the GND2 pad.
Connect the positive terminal of voltmeter 3 (VM3)
to the OUT3 pad. Connect the negative terminal of
VM3 to the GND3 pad.
Connect the positive terminal of voltmeter 4 (VM4)
to PGOOD (TP8) and the negative terminal to the
PGND pad.
Set the power supply to 12V and disable the output.
Connect the positive terminal of the power supply
to the VIN pad. Connect the negative terminal of the
power supply to the PGND pad.
Turn on the power supply.
Verify that the VOUT1, VOUT2, and VOUT3 outputs
measure 3.3V, 1.8V, and 1.2V, respectively.
Procedure
3)
Input Source
4)
5)
MAX15049 Bias Input
6)
7)
8)
9)
10) Verify that PGOOD measures approximately 5V.
11) The EV kit is now ready for load testing. Use the
respective OUT_ connector load points for high-
current load testing.
Table 1. MAX15049 Bias Input Configuration (JU1)
SHUNT POSITION
Installed
Not installed
MAX15049 IN PIN
Connected to REG
Connected to VIN
MAX15049 EV KIT INPUT RANGE (V)
4.5 to 5.5
4.7 to 16
_______________________________________________________________________________________
3
MAX15049 Evaluation Kit
Evaluates: MAX15048/MAX15049
The MAX15049 EV kit’s three outputs are configured to
different voltages. The bottom side of the PCB contains
the IC and the feedback and compensation compo-
nents. The top side of the PCB contains the input/output
capacitors, inductors, and FETs. OUT1 is configured to
3.3V with resistors R3 and R6 and can supply up to 3A.
OUT2 is configured to 1.8V with resistors R9 and R12
and can supply up to 3A. OUT3 is configured to 1.2V
with resistors R16 and R18 and can supply up to 6A.
The output voltage for each output can be reconfigured
between 0.6V and 3.3V by replacing the respective feed-
back resistors. Refer to the
Type III: Compensation When
ƒ
CO
< ƒ
ZERO, ESR
section in the MAX15048/MAX15049
IC data sheet for instructions on selecting new resis-
tor values for the respective outputs. Also, refer to the
Inductor Selection
and
Input-Capacitor Selection
sec-
tions in the IC data sheet to verify other component
replacements for proper operation when changing the
output voltage.
The MAX15049 EV kit uses the low-side MOSFET DC
on resistance (R
DSON
) for valley current sensing. The
current-limit threshold is 69mV internally set inside
the MAX15049. The MAX15049 compares the voltage
across the low-side MOSFET (R
DSON
) with the internal
threshold to incorporate the current limit. OUT1 and
OUT2 use the FDMC8200 FET with a low-side R
DSON
of
9.5mI (typ) and 13.5mI (max). The current-limit thresh-
old is 69mV (typ) and the output current limit calculated
is approximately 6A. The IRF7907 FET has similar char-
acteristics with a 9.1mI (typ) and 13.7mI (max) R
DSON
and therefore, a similar current limit.
Triple Outputs
The MAX15049 PWM switching frequency is set to appro-
ximately 500kHz with resistor R21 (39.2kI). Replace
resistor R21 with a new resistor value to progam the
switching frequency between 200kHz and 1.2MHz. Use
the following equation to choose the appropriate resistor
value to reconfigure the switching frequency (f
SW
):
f
SW
(
kHz
)
=
12.8
×
R21
(
k
Ω
)
Switching Frequency
The MAX15049 EV kit comes configured for sequencing.
The EV kit can also evaluate the MAX15048 for tracking
applications. The MAX15049 IC must be replaced with
the MAX15048. It also requires modification at EN2
(pin 9) and EN3 (pin 24) for tracking operation with
the MAX15048. Refer to the
MAX15048 Coincident/
Ratiometric Tracking (EN_)
section in the MAX15048/
MAX15049 IC data sheet to calculate the proper values
for resistors R23–R26 and R29.
The MAX15049 EV kit provides a PGOOD logic output to
indicate the regulation state of OUT1, OUT2, and OUT3.
A logic-low at TP8 (PGOOD test point) indicates that one
of the output voltages has dropped below 92% of its
regulation voltage.
The MAX15049 EV kit provides an individual enable test
point for each output. The EV kit comes configured for
sequencing and connections so the enable test points
are not needed. To disable sequencing and externally
control each output, remove the sequencing compo-
nents (R23–R28) and apply a voltage on the EN_ test
point.
Evaluating the MAX15048 (Tracking)
Current Limit
PGOOD Status Output
Individual EN_ Input
4
______________________________________________________________________________________
MAX15049 Evaluation Kit
Evaluates: MAX15048/MAX15049
Figure 1. MAX15049 EV Kit Schematic
_______________________________________________________________________________________
5
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