MAX15026B [MAXIM]
600kHz Switching Frequency;
| 型号： | MAX15026B |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 600kHz Switching Frequency |
| 文件： | 总10页 (文件大小：236K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4181; Rev 0; 6/08
MAX15026B Evaluation Kit
Evluates:MAX15026B
General Description
Features
o 5V to 16V Input Range
The MAX15026B evaluation kit (EV kit) is a fully assem-
bled and tested PCB that contains all the components
necessary to evaluate the performance of the
MAX15026B 10A synchronous step-down controller.
o Optional 4.5V to 5.5V Input Range for MAX15026B IC
o 1.5V at 10A Output
o 600kHz Switching Frequency
o Enable Input
o Power-Good Output
The MAX15026B EV kit requires a 5V to 16V power sup-
ply that provides up to 4A for normal operation. The
MAX15026B EV kit output is configured to 1.5V and
delivers up to 10A output current. The controller switch-
ing frequency is programmed to 600kHz. The
MAX15026B EV kit includes PCB pads to enable the cir-
cuit and to monitor the power-good output.
o Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX150±6BEVKIT+
EV Kit
+Denotes lead-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
68pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H680J
330µF ±±0%, ±5V electrolytic
capacitor (10mm x 10.±mm)
Panasonic EEEFC1E331P
C13
C14
C15
1
1
1
C1
C±
C3
C4
C5
1
1
1
1
1
15pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885CH150J
4.7µF ±10%, ±5V X5R ceramic
capacitor (0805)
Murata GRM±1BR61E475K
1500pF ±10%, 50V C0G ceramic
capacitor (0603)
1µF ±10%, ±5V X5R ceramic
capacitor (0603)
Murata GRM1885C1H15±K
Murata GRM188R61E105K
±±00pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H±±±J
4.7µF ±10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
C16
C17
1
0
±.±µF ±10%, 6.3V X5R ceramic
capacitor (0603)
Not installed, ceramic capacitor
(0603)
Murata GRM188R60J±±5K
JU1
JU±
1
1
3-pin header
±-pin header
10µF ±10%, ±5V X5R ceramic
capacitor (1±06)
C6
C7
C8
1
0
1
1.4µH, ±±A inductor
Coilcraft MSS1±78-14±ML
Murata GRM31CR61E106K
L1
N1
N±
1
1
1
4
Not installed, ceramic capacitor
(1±06)
30V, 74A n-channel MOSFET (SO-8FL)
ON Semiconductor NTMFS4837NT1G
0.47µF ±10%, 16V X7R ceramic
capacitor (0603)
Murata GRM188R71C474K
30V, 104A n-channel MOSFET (SO-8FL)
ON Semiconductor NTMFS4835NT1G
±700pF ±5%, 50V C0G ceramic
capacitor (0805)
Murata GRM±165C1H±7±JA
PGND (±),
VIN, VOUT
Uninsulated banana jacks
C9
C10
1
1
±
TP1, TP±
±
0
1
1
1
PC mini red test points
470µF ±±0%, 4V electrolytic
capacitor (8mm x 10.5mm)
SANYO 4CE470EX
R1, R6, R8
Not installed, resistors (0603)
±00kꢀ ±1% resistor (0603)
10ꢀ ±5% resistor (0603)
51kꢀ ±5% resistor (0603)
R±
R3
R4
±±µF ±10%, 6.3V X5R ceramic
capacitors (1±06)
Murata GRM31CR60J±±6K
C11, C1±
________________________________________________________________ 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.
MAX15026B Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
±.±ꢀ ±5% resistor (0603)
1ꢀ ±1% resistor (1±10)
DESIGNATION QTY
DESCRIPTION
R5
R7
1
1
1
1
1
1
1
1
R15
1
1
49.9ꢀ ±1% resistor (0805)
10A synchronous step-down controller
(14 TDFN-EP*)
Maxim MAX150±6BETD+
(Top Mark: +ADP)
R9
11.8kꢀ ±1% resistor (0603)
±±.6kꢀ ±1% resistor (0603)
5.9kꢀ ±1% resistor (0603
15.4kꢀ ±1% resistor (0603)
10kꢀ ±1% resistor (0603)
±7kꢀ ±1% resistor (0603)
U1
R10
R11
R1±
R13
R14
—
—
±
1
Shunts (JU1, JU±)
PCB: MAX150±6B Evaluation Kit+
*EP = Exposed pad.
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Coilcraft, Inc.
847-639-6400
770-436-1300
60±-±44-6600
800-344-±11±
619-661-6835
www.coilcraft.com
Murata Electronics North America, Inc.
ON Semiconductor
www.murata-northamerica.com
www.onsemi.com
Panasonic Corp.
www.panasonic.com
SANYO Electric Co., Ltd.
www.sanyodevice.com
Evluates:MAX15026B
Note: Indicate that you are using the MAX15026B when contacting these component suppliers.
8) Enable the electronic load and set it to 10A.
Quick Start
Required Equipment
Before beginning, the following equipment is needed:
9) Verify that the voltmeters at VOUT and PGOOD are
1.5V and approx 5.2V, respectively.
Detailed Description of Hardware
•
•
•
MAX15026B EV kit
The MAX15026B EV kit is a fully assembled and tested
PCB that contains all the components necessary to
evaluate the performance of the MAX15026B 10A syn-
chronous step-down controller. The circuit uses a
MAX15026B step-down controller IC to implement a
step-down synchronous DC-DC converter circuit. The
MAX15026B EV kit is designed to operate from a single
DC power supply that provides 5V to 16V and 4A of
current. The MAX15026B controller can also be operat-
ed using a separate 4.5V to 5.5V power source applied
at the VCC and AGND PCB pads. When operating the
MAX15026B EV kit using separate power-supply
sources at the VIN connector and VCC PCB pad, apply
power at the VIN and PGND connectors first and then
the VCC and AGND PCB pads.
Adjustable 5V to 16V, 4A DC power supply
Electronic load capable of sinking 10A
(e.g., HP6060B)
•
Two voltmeters
Procedure
The MAX15026B 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) Install a shunt across pins 1-2 of jumper JU1 (VIN
input source for U1).
2) Install a shunt at jumper JU2 (VOUT enabled).
3) Connect a voltmeter to the VOUT and PGND pads.
4) Connect a voltmeter to the PGOOD and AGND pads.
The MAX15026B EV kit converter is configured to 1.5V
and provides up to 10A output current. The switching
frequency is set to 600kHz using resistor R14. The EV
kit features PCB pads to evaluate the enable input sig-
nal (EN) and to monitor the power-good (PGOOD) and
VCC output signals.
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 12V.
7) Enable the power supply.
2
_______________________________________________________________________________________
MAX15026B Evaluation Kit
Evluates:MAX15026B
Converter Input Source
Current-Limit Thresholds
The MAX15026B IC employs a current-sensing algo-
rithm using the on-resistance of the low-side MOSFET
as a current-sensing element to limit the inductor cur-
rent. The inductor current is sensed in the converter by
sensing the voltage drop across the on-resistance
Banana jack connectors VIN and PGND are used as
the power source for the converter. The MAX15026B
EV kit converter output performance is optimized over
the 5V to 16V VIN input voltage range and up to 10A
output current. The MAX15026B EV kit can operate
above the 16V maximum input-voltage range and at
higher output currents; however, performance may be
degraded due to the limitation of the components used
in the circuit.
R
of the low-side MOSFET (N2). The MAX15026B
DSON
EV kit’s valley and sink current limits are set to approxi-
mattely 16.5A and 8A, respectively.
Resistor R9 sets VOUT valley current-limit voltage
thresholds (V ) to 59mV. The sink current-limit voltage
ITH
MAX15026B IC Bias Input (JU1)
The MAX15026B EV kit features an option to select the
bias input for the MAX15026B IC controller when con-
figuring the EV kit to operate with an input source less
than 6V. Jumper JU1 selects the input-voltage source
for the MAX15026B IC controller. Place a shunt across
pins 1-2 to power the MAX15026B IC using the power
source applied at the VIN and PGND banana jack con-
nectors. Place a shunt across pins 2-3 to power the
MAX15026B IC input using the power source applied at
the VCC and AGND PCB pads. Note that the power
source applied to the VCC PCB pad has a 4.5V to 5.5V
input-voltage range. When operating the MAX15026B
EV kit using separate power-supply sources at the VIN
connector and VCC PCB pad, apply power at the VIN
and PGND connectors first and then the VCC and
AGND PCB pads.
threshold is approximately half the valley current-limit
voltage threshold. Use the following equation to recon-
figure the valley current-limit voltage threshold:
V
×10
−6
ITH
R
(Ω) =
LIM_
50 ×10
where V
is the valley current-limit voltage threshold
LIM_
ITH
in volts and R
is R9 in ohms.
Refer to the Current Limit Circuit (LIM) and Setting the
Valley Current Limit sections in the MAX15026 IC data
sheet for further instructions on computing the
MAX15026B EV kit valley and sink current limits.
A PCB pad for resistor R8 is provided to implement
foldback current-limit capabilities, if required.
Switching Frequency
The MAX15026B controller switching frequency is set
to 600kHz by resistor R14. Replace resistor R14 with a
new resistor value to program the switching frequency
between 200kHz and 2MHz. Use the following equa-
tion to calculate R14 when reconfiguring the switching
frequency:
Table 1. MAX15026B Bias Input
Configuration (JU1)
SHUNT
POSITION
MAX15026B IC
INPUT RANGE (V)
MAX15026B IN PIN
1-±
±-3
Connected to VIN
Connected to VCC
5 to 16
4.5 to 5.5
9
17.3 ×10
R14 =
Configuring the Output Voltage (VOUT)
VOUT voltage can be reconfigured between 0.6V to
0.85 x VIN. To configure the EV kit’s output voltage,
refer to the Setting the Output Voltage section in the
MAX15026 IC data sheet for instructions on selecting
new resistor values.
−7
2
f
+ (1x10 )× (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 the compensa-
tion network component to new values. Refer to the
Compensation section in the MAX15026 IC data sheet
for computing new compensation component values.
Capacitors C13–C16 and resistors R10 and R11 pro-
vide a compensation network for VOUT on the
MAX15026B EV kit.
Power-Good Output (PGOOD)
The MAX15026B EV kit provides a PCB pad to monitor
the status of the power-good output. 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.
Refer to the Inductor Selection, Input Capacitor Selection,
and the Compensation sections in the MAX15026 IC
data sheet to verify whether other components need
replacement for proper operation after reconfiguring
the output voltage.
_______________________________________________________________________________________
3
MAX15026B Evaluation Kit
Enable Control (JU2)
Table 2. Enable Control (JU2)
Jumper JU2 configures the MAX15026B EV kit’s output
for turn-on/turn-off control. Install a shunt across jumper
JU2 to enable VOUT. VOUT is disabled or can also be
externally controlled by placing an independent voltage
source at the EN and AGND PCB pad when a shunt is
not installed at jumper JU2. An additional PCB resistor
pad (R1) is included to set the output to a desired turn-
on voltage.
SHUNT
POSITION
EN PIN
VOUT OUTPUT
Installed
Connected to VCC
Enabled
Disabled or voltage
source applied at EN
PCB pad
Pulled down to
AGND through R±
Not installed
Evluates:MAX15026B
4
_______________________________________________________________________________________
MAX15026B Evaluation Kit
Evluates:MAX15026B
Figure 1. MAX15026B EV Kit Schematic
_______________________________________________________________________________________
5
MAX15026B Evaluation Kit
Evluates:MAX15026B
Figure 2. MAX15026B EV Kit Component Placement Guide—Component Side
6
_______________________________________________________________________________________
MAX15026B Evaluation Kit
Evluates:MAX15026B
Figure 3. MAX15026B EV Kit PCB Layout—Component Side
_______________________________________________________________________________________
7
MAX15026B Evaluation Kit
Evluates:MAX15026B
Figure 4. MAX15026B EV Kit PCB Layout—Power Layer 2
8
_______________________________________________________________________________________
MAX15026B Evaluation Kit
Evluates:MAX15026B
Figure 5. MAX15026B EV Kit PCB Layout—GND Layer 3
_______________________________________________________________________________________
9
MAX15026B Evaluation Kit
Evluates:MAX15026B
Figure 6. MAX15026B EV Kit PCB 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.
10 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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