MAX15046B Eval Kit Datasheet by Analog Devices Inc./Maxim Integrated

lVI/JXI/VI [VI/JXIIVI
_______________________________________________________________ Maxim Integrated Products 1
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MAX15046B Evaluation Kit
Evaluates: MAX15046B
19-4920; Rev 0; 8/09
General Description
The MAX15046B evaluation kit (EV kit) is a fully assem-
bled and tested circuit board that contains all the com-
ponents necessary to evaluate the performance of the
MAX15046B 10A synchronous step-down controller. The
MAX15046 IC is available in a small 16-pin QSOP pack-
age with an exposed pad.
The MAX15046B EV kit requires a 5V to 40V input-
voltage range power supply that provides up to 7A for
normal operation. The MAX15046B EV kit output is con-
figured to 3.3V and delivers up to 10A output current.
The controller’s switching frequency is programmed to
350kHz. The MAX15046B EV kit includes PCB pads to
enable the circuit and to monitor the power-good output.
Features
S 5V to 40V (24V typ) Input Range
S Optional 4.5V to 5.5V Input Range
S 3.3V at 10A Output
S 350kHz Switching Frequency
S Enable Input
S Power-Good Output
S Fully Assembled and Tested
Ordering Information
+Denotes lead(Pb)-free and RoHS compliant.
Component List
PART TYPE
MAX15046BEVKIT+ EV Kit
DESIGNATION QTY DESCRIPTION
C1 1
100FF Q20%, 50V electrolytic capaci-
tor ( 8mm x 10.2mm)
Panasonic EEVFK1H101P
C2, C19 2
0.1FF Q10%, 50V X7R ceramic capaci-
tors (0603)
Murata GRM188R71H104K
C3 1
1FF Q10%, 50V X5R ceramic
capacitor (0805)
Murata GRM21BR71H105K
C4 1
4.7FF Q10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
C5 1
2.2FF Q10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J225K
C6, C7 2
10FF Q20%, 50V X5R ceramic capaci-
tors (1210)
Taiyo Yuden UMK325BJ106MM
C8 1
0.47FF Q10%, 16V X7R ceramic
capacitor (0603)
Murata GRM188R71C474K
C9 1
1000pF Q5%, 50V C0G ceramic
capacitor (0805)
Murata GRM2165C1H102J
DESIGNATION QTY DESCRIPTION
C10, C11 2
100FF Q20%, 6.3V X5R ceramic
capacitors (1210)
Murata GRM32ER60J107M
C12 1
47FF Q10%, 6.3V X5R ceramic capaci-
tor (1206)
Murata GRM31CR60J476K
C13 1
68pF Q5%, 50V C0G
ceramic capacitor (0603)
Murata GRM1885C1H680J
C14 1
15pF Q5%, 50V C0G
ceramic capacitor (0603)
Murata GRM1885C1H150J
C15 1
1500pF Q10%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H152K
C16 1
220pF Q5%, 50V C0G ceramic capaci-
tor (0603)
Murata GRM1885C1H221J
C17, C20 0 Not installed, ceramic capacitors
(0603)
C18 0 Not installed, ceramic capacitor (0805)
fll/JXIIVI
MAX15046B Evaluation Kit
Evaluates: MAX15046B
2 ______________________________________________________________________________________
Component List (continued)
*EP = Exposed pad.
Note: Indicate that you are using the MAX15046B when contacting these component suppliers.
Component Suppliers
SUPPLIER PHONE WEBSITE
Diodes, Inc. 805-446-4800 www.diodes.com
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
Panasonic Corp. 800-344-2112 www.panasonic.com
Taiyo Yuden 800-348-2496 www.t-yuden.com
Vishay 402-563-6866 www.vishay.com
DESIGNATION QTY DESCRIPTION
D1 1
0.5A, 60V Schottky diode (SOT23)
Diodes, Inc. ZHCS506
(Top Mark: S56)
JU1 1 2-pin header
JU2 1 3-pin header
L1 1 1.5FH, 27.5A inductor
Vishay IHLP-4040DZ ER1R5M
N1 1
60V, 6.2A n-channel MOSFET
(Powerpack 8 SO)
Vishay (Siliconix) Si7850DP-T1-E3
N2 1
60V, 11A n-channel MOSFET
(Powerpack 8 SO)
Vishay (Siliconix) Si7460DP-T1-E3
PGND (x2),
VIN, VOUT 4 Uninsulated banana jacks
TP1, TP2 2 PC mini red test points
R1 1 0I Q5% resistor (1210)
R3 1 10I Q5% resistor (0603)
R4 1 51kI Q5% resistor (0603)
R5 1 2.2I Q5% resistor (0603)
DESIGNATION QTY DESCRIPTION
R7 1 10I Q1% resistor (1210)
Vishay (Dale) CRCW121010R00FNEA
R8 0 Not installed, resistor (0603)
R9 1 32.4kI Q1% resistor (0603)
R10 1 22.6kI Q1% resistor (0603)
R11 1 3.65kI Q1% resistor (0603)
R12 1 105kI Q1% resistor (0603)
R13 1 23.2kI Q1% resistor (0603)
R14 1 43.2kI Q1% resistor (0603)
R15 1 49.9I Q1% resistor (0805)
R16, R17 2 0I Q5% resistors (0603)
U1 1
10A synchronous step-down
controller (16 QSOP-EP*)
Maxim MAX15046BAEE+
— 2 Shunts (JU1, JU2)
— 1 PCB: MAX15046B EVALUATION KIT+
[MAXI/VI
MAX15046B Evaluation Kit
Evaluates: MAX15046B
_______________________________________________________________________________________ 3
Quick Start
Required Equipment
• Adjustable 5V to 40V, 7A DC power supply
• Electronic load capable of sinking up to 10A
(e.g., HP6060B)
• Two voltmeters
Procedure
The MAX15046B EV kit is fully assembled and test-
ed. Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1) Verify that a shunt is not installed on jumper JU1
(VIN input source for U1).
2) Install a shunt on pins 1-2 of jumper JU2 (VOUT
enabled).
3) Connect a voltmeter to the VOUT and PGND PCB
pads.
4) Connect a voltmeter to the PGOOD and GND PCB
pads.
5) Connect a 10A electronic load to the VOUT and
PGND banana jack connectors.
6) Connect a DC power supply to the VIN and PGND
banana jack connectors and set the voltage to 24V.
7) Enable the power supply.
8) Enable the electronic load and set it to 5A.
9) Verify that the voltmeters at VOUT and PGOOD are
3.3V and approximately 5.2V, respectively.
Detailed Description of Hardware
The MAX15046B EV kit is a fully assembled and tested
circuit board that contains all the components neces-
sary to evaluate the performance of the MAX15046B
10A synchronous step-down controller. The circuit uses
a MAX15046B step-down controller IC to implement a
step-down synchronous DC-DC converter circuit. The
MAX15046B EV kit is designed to operate from a single
DC power supply that provides 5V to 40V and 7A of cur-
rent. For improved efficiency, the MAX15046B controller
can also be operated using a 4.5V to 5.5V power source
applied at the VIN and PGND PCB pads and shorting
together (JU1) the MAX15046B IC IN and VCC inputs.
When operating the MAX15046B EV kit using separate
power-supply sources at the VIN connector and VCC
PCB pads, apply power at the VIN and PGND connec-
tors and then the VCC and GND PCB pads.
The MAX15046B EV kit converter is configured to 3.3V
and provides up to 10A output current. The switching
frequency is set to 350kHz using resistor R14. The EV kit
features PCB pads to evaluate the enable input signal
(EN) and to monitor the power-good (PGOOD) output
signal.
Converter Input Source
Banana jack connectors VIN and PGND connect the
power source for the converter. The MAX15046B EV
kit converter output performance is optimized over the
5V to 40V VIN input voltage, while providing up to 10A
output current. The MAX15046B EV kit can operate at
higher output currents; however, performance may be
degraded due to the limitation of the components used
on the circuit, which might require reevaluation.
MAX15046B IC Bias Input (JU1)
The MAX15046B EV kit features an option to select the
bias input for the MAX15046B IC controller when config-
uring the EV kit to operate with an input source less than
6V. Jumper JU1 selects the input-voltage source for the
MAX15046B IC controller VCC pin. Remove the shunt on
jumper JU1 to power the MAX15046B IC using the power
source applied at the VIN and PGND banana jack con-
nectors. The input-voltage range at VIN in this configu-
ration is 5.5V to 40V. When operating the MAX15046B
EV kit using separate power-supply sources at the VIN
connector and VCC PCB pads, apply power at the VIN
and PGND connectors first and then the VCC and GND
PCB pads.
To operate with a source less than 6V, install a shunt
across jumper JU1. Then power the MAX15046B EV kit
VIN input using a power source applied at the VIN and
PGND PCB pads. Note that the power source applied to
the VIN PCB pad in this configuration has a 4.5V to 5.5V
input-voltage range.
Table 1. MAX15046B Bias Input
Configuration (JU1)
SHUNT
POSITION
MAX15046B IN
PIN
MAX15046B EV KIT
INPUT RANGE (V)
Installed Connected to VCC 4.5 to 5.5
Not installed Connected to VIN 5.5 to 40
50x10 fll/JXIIVI
MAX15046B Evaluation Kit
Evaluates: MAX15046B
4 ______________________________________________________________________________________
Configuring the Output Voltage
The MAX15046B EV kit’s VOUT voltage can be recon-
figured between 0.6V to 0.85 x VIN. To configure the
MAX15046B EV kit’s output voltage, refer to the Setting
the Output Voltage section in the MAX15046 IC data
sheet for instructions on selecting new resistor values.
Capacitors C13–C16 and resistors R10 and R11 provide
a compensation network for VOUT on the MAX15046B
EV kit circuit.
Refer to the Inductor Selection, Input Capacitor, and
Compensation Design sections in the MAX15046 IC data
sheet to verify whether other components need replace-
ment for proper operation after reconfiguring the output
voltage.
Current-Limit Thresholds
The MAX15046B IC employs a current-sensing algorithm
using the low-side MOSFET on-resistance as a current-
sensing element to limit the inductor current. The induc-
tor current is sensed in the converter by sensing the volt-
age drop across the on-resistance (RDSON) of low-side
MOSFET N2. The MAX15046B EV kit’s valley and sink
current limits are set to 13.5A and 6.75A, respectively.
Resistor R9 sets VOUT valley current-limit voltage thresh-
old (VITH) to 162mV. The sink current-limit voltage
threshold is approximately one-half the valley current-
limit voltage threshold. Use the following equation to
reconfigure the valley current-limit voltage threshold:
ITH
LIM 6
V 10
R ( )
50 10
−
×
Ω =
×
where VITH is the valley current-limit voltage threshold in
volts and RLIM is R9 in ohms.
Refer to the Current-Limit Circuit (LIM) and Setting
the Valley Current Limit sections in the MAX15046 IC
data sheet for further instructions on computing the
MAX15046B EV kit valley and sink current limits.
Surface-mount PCB pads for resistor R8 are provided to
implement foldback current-limit capabilities if required.
Switching Frequency
The MAX15046B controller switching frequency is set
to 350kHz by resistor R14. Replace resistor R14 with a
new resistor value to program the switching frequency
between 100kHz and 1MHz. Use the following equa-
tion to calculate R14 when reconfiguring the switching
frequency: 9
7 2
SW SW
17.3 10
R14
f (1x10 )x(f )
−
×
=
+
where fSW is in hertz and R14 is in ohms.
When reconfiguring the EV kit controller switching fre-
quency, it may be necessary to change compensa-
tion network component to new values. Refer to the
Compensation Design section in the MAX15046 IC data
sheet for computing new compensation component
values.
Power-Good Output (PGOOD)
The MAX15046B EV kit provides a PGOOD PCB pad to
monitor the status of the U1 power-good output signal.
PGOOD is high when VOUT rises 94.5% (typ) above its
programmed output voltage. When VOUT falls below
92% (typ) of its nominal regulated voltage, PGOOD is
pulled low. The PGOOD signal is pulled up to VCC by
resistor R4.
Enable Control (JU2)
Jumper JU2 configures the MAX15046B EV kit’s output
enable for turn on/off control. Install a shunt on pins 1-2
of jumper JU2 to enable VOUT. Conversely, VOUT is
disabled when the shunt is placed across pins 2-3 of
jumper JU2. Alternatively, the MAX15046B IC enable pin
(EN) can be controlled by an external controller. Surface-
mount PCB pads for optional capacitor C17 are included
to filter noise that may be introduced on the EN pin.
Table 2. Enable Control (JU2)
SHUNT
POSITION EN PIN VOUT OUTPUT
1-2 Connected to VCC
through R3 Enabled
2-3 Pulled down to GND Disabled
Not installed External controller External controller
enables/disables
f4—4 4mg [MAXI/VI
MAX15046B Evaluation Kit
Evaluates: MAX15046B
_______________________________________________________________________________________ 5
Figure 1. MAX15046B EV Kit Schematic
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MAX15046B Evaluation Kit
Evaluates: MAX15046B
6 ______________________________________________________________________________________
Figure 2. MAX15046B EV Kit Component Placement Guide—
Component Side
Figure 4. MAX15046B EV Kit PCB Layout—GND and VIN Layer 2
Figure 3. MAX15046B EV Kit PCB Layout—Component Side
1.0”
1.0”
1.0”
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
© 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX15046B Evaluation Kit
Evaluates: MAX15046B
Figure 5. MAX15046B EV Kit PCB Layout—PGND Layer 3 Figure 6. MAX15046B EV Kit PCB Layout—Solder Side
1.0” 1.0”