MAX15046BEVKIT+ [MAXIM]
350kHz Switching Frequency;
| 型号： | MAX15046BEVKIT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 350kHz Switching Frequency |
| 文件： | 总7页 (文件大小：973K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4920; Rev 0; 8/09
MAX15046B Evaluation Kit
General Description
Features
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.
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
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.
S Power-Good Output
S Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX15046BEVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
100FF Q20%, 50V electrolytic capaci-
tor ( 8mm x 10.2mm)
Panasonic EEVFK1H101P
100FF Q20%, 6.3V X5R ceramic
capacitors (1210)
Murata GRM32ER60J107M
C1
C2, C19
C3
1
2
1
1
1
2
1
1
C10, C11
C12
2
1
1
1
1
1
0.1FF Q10%, 50V X7R ceramic capaci-
tors (0603)
Murata GRM188R71H104K
47FF Q10%, 6.3V X5R ceramic capaci-
tor (1206)
Murata GRM31CR60J476K
1FF Q10%, 50V X5R ceramic
capacitor (0805)
Murata GRM21BR71H105K
68pF Q5%, 50V C0G
ceramic capacitor (0603)
Murata GRM1885C1H680J
C13
4.7FF Q10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
15pF Q5%, 50V C0G
ceramic capacitor (0603)
Murata GRM1885C1H150J
C4
C14
2.2FF Q10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J225K
1500pF Q10%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H152K
C5
C15
10FF Q20%, 50V X5R ceramic capaci-
tors (1210)
Taiyo Yuden UMK325BJ106MM
220pF Q5%, 50V C0G ceramic capaci-
tor (0603)
Murata GRM1885C1H221J
C6, C7
C8
C16
Not installed, ceramic capacitors
(0603)
0.47FF Q10%, 16V X7R ceramic
capacitor (0603)
Murata GRM188R71C474K
C17, C20
C18
0
0
Not installed, ceramic capacitor (0805)
1000pF Q5%, 50V C0G ceramic
capacitor (0805)
C9
Murata GRM2165C1H102J
_______________________________________________________________ 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.
MAX15046B Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
10I Q1% resistor (1210)
Vishay (Dale) CRCW121010R00FNEA
0.5A, 60V Schottky diode (SOT23)
Diodes, Inc. ZHCS506
(Top Mark: S56)
R7
1
D1
1
R8
R9
0
1
1
1
1
1
1
1
2
Not installed, resistor (0603)
32.4kI Q1% resistor (0603)
22.6kI Q1% resistor (0603)
3.65kI Q1% resistor (0603)
105kI Q1% resistor (0603)
23.2kI Q1% resistor (0603)
43.2kI Q1% resistor (0603)
49.9I Q1% resistor (0805)
0I Q5% resistors (0603)
JU1
JU2
1
1
2-pin header
3-pin header
R10
R11
1.5FH, 27.5A inductor
Vishay IHLP-4040DZ ER1R5M
L1
1
R12
R13
60V, 6.2A n-channel MOSFET
(Powerpack 8 SO)
Vishay (Siliconix) Si7850DP-T1-E3
N1
1
R14
R15
R16, R17
60V, 11A n-channel MOSFET
(Powerpack 8 SO)
Vishay (Siliconix) Si7460DP-T1-E3
N2
1
4
10A synchronous step-down
controller (16 QSOP-EP*)
Maxim MAX15046BAEE+
U1
1
PGND (x2),
VIN, VOUT
Uninsulated banana jacks
TP1, TP2
R1
2
1
1
1
1
PC mini red test points
0I Q5% resistor (1210)
10I Q5% resistor (0603)
51kI Q5% resistor (0603)
2.2I Q5% resistor (0603)
—
—
2
1
Shunts (JU1, JU2)
PCB: MAX15046B EVALUATION KIT+
R3
*EP = Exposed pad.
R4
R5
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Diodes, Inc.
805-446-4800
770-436-1300
800-344-2112
800-348-2496
402-563-6866
www.diodes.com
www.murata-northamerica.com
Murata Electronics North America, Inc.
Panasonic Corp.
Taiyo Yuden
Vishay
www.panasonic.com
www.t-yuden.com
www.vishay.com
Note: Indicate that you are using the MAX15046B when contacting these component suppliers.
2
______________________________________________________________________________________
MAX15046B Evaluation Kit
The MAX15046B EV kit converter is configured to 3.3V
Quick Start
Required Equipment
•ꢀ Adjustable 5V to 40V, 7A DC power supply
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.
•ꢀ Electronic load capable of sinking up to 10A
(e.g., HP6060B)
•ꢀ Two voltmeters
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.
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).
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.
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.
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.
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.
Table 1. MAX15046B Bias Input
Configuration (JU1)
SHUNT
POSITION
MAX15046B IN
PIN
MAX15046B EV KIT
INPUT RANGE (V)
Installed
Connected to VCC
Connected to VIN
4.5 to 5.5
5.5 to 40
Not installed
_______________________________________________________________________________________
3
MAX15046B Evaluation Kit
tion to calculate R14 when reconfiguring the switching
frequency:
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.
9
17.3×10
−7
R14 =
2
f
+ (1x10 )x(f
)
SW
SW
where f
is in hertz and R14 is in ohms.
SW
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.
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.
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.
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 (R ) of low-side
DSON
MOSFET N2. The MAX15046B EV kit’s valley and sink
current limits are set to 13.5A and 6.75A, respectively.
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.
Resistor R9 sets VOUT valley current-limit voltage thresh-
old (V ) to 162mV. The sink current-limit voltage
ITH
threshold is approximately one-half the valley current-
limit voltage threshold. Use the following equation to
reconfigure the valley current-limit voltage threshold:
V
×10
−6
ITH
R
(Ω) =
LIM
50 ×10
where V
volts and R
is the valley current-limit voltage threshold in
ITH
Table 2. Enable Control (JU2)
is R9 in ohms.
LIM
SHUNT
POSITION
EN PIN
VOUT OUTPUT
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.
Connected to VCC
through R3
1-2
Enabled
Disabled
2-3
Pulled down to GND
Surface-mount PCB pads for resistor R8 are provided to
implement foldback current-limit capabilities if required.
External controller
enables/disables
Not installed
External controller
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-
4
______________________________________________________________________________________
MAX15046B Evaluation Kit
Figure 1. MAX15046B EV Kit Schematic
_______________________________________________________________________________________
5
MAX15046B Evaluation Kit
1.0”
1.0”
Figure 2. MAX15046B EV Kit Component Placement Guide—
Component Side
Figure 3. MAX15046B EV Kit PCB Layout—Component Side
1.0”
Figure 4. MAX15046B EV Kit PCB Layout—GND and VIN Layer 2
6
______________________________________________________________________________________
MAX15046B Evaluation Kit
1.0”
1.0”
Figure 6. MAX15046B EV Kit PCB Layout—Solder Side
Figure 5. MAX15046B EV Kit PCB Layout—PGND Layer 3
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.
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