MAX15003EVKIT [MAXIM]
Programmable Switching Frequency Up to 2.2MHz;
| 型号： | MAX15003EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Programmable Switching Frequency Up to 2.2MHz |
| 文件： | 总12页 (文件大小：347K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4053; Rev 0; 2/08
MAX15003 Evaluation Kit
Evluates:MAX1503
General Description
Features
The MAX15003 evaluation kit (EV kit) is a fully assembled
and tested surface-mount printed-circuit board (PCB)
that demonstrates the capabilities of the MAX15003 IC.
The MAX15003 IC is a high-performance triple-output
synchronous buck controller, capable of delivering up to
10A per output with tracking and sequencing capability.
The EV kit requires a DC input-voltage range of 6V to
14V (12V typ) for normal operation.
♦ Triple-Output Power Supply
VOUT1 (3.3V, 3A)
VOUT2 (2.5V, 4A)
VOUT3 (1.2V, 10A)
♦ 600kHz PWM Switching
♦ Programmable Switching Frequency Up to 2.2MHz
♦ External Frequency Synchronization
♦ Selectable Tracking or Sequencing Operation Mode
♦ Selectable Phase Operation Mode
The EV kit outputs are configured for 3.3V, 2.5V, and
1.2V, and provide 3A, 4A, and 10A, respectively. The
MAX15003 IC switching frequency is programmed to
600kHz or can be synchronized to an external clock sig-
nal with a frequency of up to 2.2MHz. The phase-and-
tracking/sequencing operation modes are configurable.
The PGOOD1, PGOOD2, PGOOD3, and RESET logic
signal output pads are provided for circuit monitoring.
♦ Individual PGOOD and RESET Signal Outputs
♦ Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX15003EVKIT+
EV Kit
+Denotes lead-free and RoHS-compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
150µF 20ꢀ, 16V aluminum
electrolytic capacitor (D8)
Panasonic EEEFK1C151XP
2200pF 10ꢀ, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H222K
C1
1
C11
1
820pF 10ꢀ, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H821K
22µF 20ꢀ, 16V X5R ceramic
capacitors (1210)
TDK C3225X5R1C226M or
Murata GRM31CR61C226M
C13
C19
1
1
C2, C8, C14
3
7
4
270pF 10ꢀ, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H271K
0.1µF 10ꢀ, 50V X7R ceramic
capacitors (0603)
TDK C1608X7R1H104K or
Murata GRM188R71H104K
C3, C9, C15,
C20, C24, C25,
C26
2.2µF 10ꢀ, 6.3V X5R ceramic
capacitor (0603)
TDK C1608X5R0J225K or
Murata GRM188R60J225K
C21
C22
1
1
100µF 20ꢀ, 6.3V X5R ceramic
capacitors (1210)
TDK C3225X5R0J107M or
Murata GRM32ER60J107M
C4, C10, C16,
C23
0.022µF 10ꢀ, 50V X7R ceramic
capacitor (0603)
TDK C1608X7R1H223K or
Murata GRM188R71H223K
1500pF 10ꢀ, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H152K
C5, C17
C6, C12, C18
C7
2
3
1
100mA, 30V Schottky diodes
(SOD523)
Central Semiconductor CMOSH-3
+ LEAD FREE
47pF 5ꢀ, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H470J
D1, D3, D5
3
(Top Mark: 53)
680pF 10ꢀ, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H681K
________________________________________________________________ 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.
MAX15003 Evaluation Kit
Component List (continued)
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
R4
R5
1
1
3
0
1
1
25.5kΩ 1ꢀ resistor (0603)
8.06kΩ 1ꢀ resistor (0603)
11kΩ 1ꢀ resistors (0603)
Not installed, resistors—short (1206)
787Ω 1ꢀ resistor (0603)
3.09kΩ 1ꢀ resistor (0603)
1A, 20V Schottky diodes
(SOD123F)
Central Semiconductor CMMSH1-
20 + LEAD FREE
D2, D4, D6
3
R6, R18, R30
R9, R21
R10
(Top Mark: CS20F)
IN, PGND (4),
VOUT1, VOUT2,
VOUT3
Noninsulated banana-jack
connectors
R11
8
2
1
R12, R24, R36,
R38, R39
5
10kΩ 5ꢀ resistors (0603)
JU1, JU2
3-pin headers
2.2µH, 6A, 19mΩ inductor
Sumida CDMC6D28NP-2R2M or
Vishay IHLP-2525CZ-ER-2R2-M-11
R13
R14
1
1
2
1
1
1
1
1
2
0
1
1
3
1
3
3
3
22Ω 5ꢀ resistor (0603)
332kΩ 1ꢀ resistor (0603)
100kΩ 1ꢀ resistors (0603)
26.7kΩ 1ꢀ resistor (0603)
5.90kΩ 1ꢀ resistor (0603)
649Ω 1ꢀ resistor (0603)
2.87kΩ 1ꢀ resistor (0603)
6.8Ω 5ꢀ resistor (0603)
54.9kΩ 1ꢀ resistors (0603)
Not installed, resistor—short (1210)
1.96kΩ 1ꢀ resistor (0603)
2.26kΩ 1ꢀ resistor (0603)
2.2Ω 5ꢀ resistors (0603)
165kΩ 1ꢀ resistor (0603)
21.5kΩ 1ꢀ resistors (0603)
Test points, red
L1
R15, R41
R16
3.3µH, 5A, 30mΩ inductor
Sumida CDMC6D28NP-3R3M or
Vishay IHLP-2525CZ-ER-3R3-M-11
L2
L3
1
1
R17
R22
0.47µH, 13.6A, 4mΩ inductor
Sumida CDMC6D28NP-R47M or
Vishay IHLP-2525CZ-ER-R47-M-01
R23
Evluates:MAX1503
R25
7.6A/11A, 30V dual n-channel
MOSFET (8-pin SO)
International Rectifier
IRF7904UPbF
R28, R29
R33
N1
1
1
R34
R35
11A, 30V, 13.8mΩ n-channel
MOSFET (8-pin SO)
International Rectifier
IRF7807ZPbF or
International Rectifier
IRF7821UpbF
R37, R45, R46
R40
N2
N3
R42, R43, R44
TP1, TP2, TP3
TP4, TP5, TP6
Test points, black
30A, 20V, 3mΩ n-channel
MOSFET (PowerPAK 8-pin SO)
Vishay Si7336ADP-T1-E3
1
1
Triple output buck controller
(48-pin TQFN-EP*, 7mm x 7mm)
Maxim MAX15003ATM+
U1
1
8.6A/6.3A, 30V dual n-channel
MOSFET (8-pin SO)
Fairchild FDS6982AS or
—
2
1
Shunts (JU1, JU2)
N4
R1
—
PCB: MAX15003 Evaluation Kit+
International Rectifier IRF7905PbF
*EP = Exposed pad.
1
0
15Ω 5ꢀ resistor (0603)
R2, R3, R7, R8,
R19, R20, R26,
R27, R31, R32
Not installed, resistors (0603)
R2, R8, R20, R26, and R32 are open;
R3, R7, R19, R27, R31 are short
2
_______________________________________________________________________________________
MAX15003 Evaluation Kit
Evluates:MAX1503
Component Suppliers
SUPPLIER
Central Semiconductor
Fairchild Semiconductor
International Rectifier
Murata Mfg. Co., Ltd.
Panasonic Corp.
Sumida Corp.
PHONE
WEBSITE
www.centralsemi.com
631-435-1110
888-522-5372
310-322-3331
770-436-1300
800-344-2112
847-545-6700
847-803-6100
203-268-6261
www.fairchildsemi.com
www.irf.com
www.murata.com
www.panasonic.com
www.sumida.com
www.component.tdk.com
www.vishay.com
TDK Corp.
Vishay
Note: Indicate that you are using the MAX15003 when contacting these component suppliers.
9) Turn on the power supply.
__________________________Quick Start
Required Equipment
Before beginning, the following equipment is needed:
10) Verify that the VOUT1, VOUT2, and VOUT3 outputs
measure 3.3V, 2.5V, and 1.2V, respectively.
11) Verify that the PGOOD1, PGOOD2, PGOOD3, and
RESET signals measure approximately 3.3V, 2.5V,
1.2V, and 5V, respectively.
•
•
•
One 14V, 10A adjustable power supply
Three voltmeters
One 4-channel oscilloscope
12) The EV kit is ready for load testing. Use the
respective VOUT_ banana jacks for high-current
load testing.
Procedure
The MAX15003 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below to verify
board operation. Caution: Do not turn on the power
supply until all connections are completed.
Detailed Description of Hardware
The MAX15003 EV kit is a fully assembled and tested
surface-mount PCB that demonstrates the MAX15003
IC, which integrates three high-performance PWM
switching step-down DC-DC controllers. Additionally,
the MAX15003 IC can be enabled in tracking or
sequence modes and can operate in phase or 120°
out-of-phase. The EV kit circuit operates over the
input-voltage range of 6V to 14V. The outputs are con-
figured for 3.3V, 2.5V, and 1.2V, providing up to 3A,
4A, and 10A, respectively. The MAX15003 switching
frequency of 600kHz is programmed with resistor R40.
The frequency can be programmed from 200kHz to
2.2MHz by replacing this resistor, or can be synchro-
nized to an external clock signal through the SYNC
input pad. The MAX15003 EV kit PCB is designed with
4-layer and 2oz copper for optimum performance.
1) Verify that a shunt is across pins 1-2 of jumper JU1
(ratiometric tracking mode).
2) Verify that a shunt is across pins 2-3 of jumper JU2
(out-of-phase mode).
3) Connect a voltmeter across the VOUT1 and PGND
two-hole PCB pads.
4) Connect a voltmeter across the VOUT2 and PGND
two-hole PCB pads.
5) Connect a voltmeter across the VOUT3 and PGND
two-hole PCB pads.
6) Connect the 4-channel oscilloscope probes to the
PGOOD1, PGOOD2, PGOOD3, and RESET two-
hole PCB pads. Connect each probe ground lead to
the SGND two-hole PCB pad.
The phase and tracking/sequencing operation modes
are selectable through jumpers JU1 and JU2.
Coincident tracking, ratiometric tracking, or sequencing
options enable tailoring of the power-up/power-down
sequence depending on the application requirements.
PGOOD1, PGOOD2, PGOOD3, and RESET logic signal
output pads are provided for circuit monitoring.
7) Set the adjustable power supply to 12V and disable
the output.
8) Connect the positive terminal of the power supply
to the IN banana jack connector. Connect the neg-
ative terminal of this power supply to the PGND
banana jack connector.
_______________________________________________________________________________________
3
MAX15003 Evaluation Kit
Table 1. Current-Limit Resistor Configuration
VOUT_ OUTPUT ILIM_ RESISTORS OPEN RESISTOR
0Ω RESISTOR
INDUCTOR CURRENT-SENSING ELEMENTS
R20
R19
R20
R7
N4-A + R21
R21
VOUT1
VOUT2
VOUT3
R44, R23
R42, R11
R43, R35
R19
R8
N1-B + R9
R9
R7
R8
R32
R31
R31
R32
N3 + R33
R33
The MAX15003 IC limits the inductor current by sensing
the voltage drop across the respective MOSFET’s
Input Source
The MAX15003 EV kit is configured for normal operation
with an input power source of 6V to 14V. However, the
upper input-voltage limit can be raised to 23V by replac-
ing capacitors C1, C2, C8, and C14 with higher voltage-
rated capacitors. The EV kit circuit requires a minimum
5.5V input to generate the 5V regulation voltage (REG)
used to power the MOSFET gate drivers and provide
the pullup voltage for the SEL and PHASE inputs.
low-side on-resistance (R
) at each output. The
DS(ON)
equivalent low-side sense resistance for each output
can be changed by cutting open the PCB shorting trace
across R9, R21, and R33 and installing sense resistors.
Alternatively, the low-side MOSFET’s R
can be
DS(ON)
eliminated from the equivalent low-side sense resis-
tance, at each buck converter, by cutting open the PCB
shorting trace across R19, R7, or R31, and installing a
shorting resistor at R20, R31, or R32, respectively. See
Table 1 for current-limit resistor configuration.
Evluates:MAX1503
Triple Outputs
The MAX15003 EV kit’s three outputs are configured to
different voltages. VOUT1 is configured to 3.3V, with
resistors R16 and R17, and can supply up to 3A.
VOUT2 is configured to 2.5V, with resistors R4 and R5,
and can supply up to 4A. VOUT3 is configured to 1.2V,
with resistors R28 and R29, and can supply up to 10A.
The output voltage for each output can be reconfigured
between 0.6V and 0.9V x IN by replacing the respective
feedback resistors. Refer to the Type III: Compensation
Switching Frequency
The MAX15003 PWM switching frequency is set to
600kHz with resistor R40 (165kΩ). Replace resistor R40
with a new resistor value to progam the switching
frequency between 200kHz and 2.2MHz. Use the fol-
lowing equation to choose the appropriate resistor
value to reconfigure the switching frequency (f ):
SW
when f
< f
section in the MAX15003 IC
ZERO, ESR
CO
data sheet for instructions on selecting new resistor val-
ues for the respective outputs. Also refer to the Inductor
Selection, Input Capacitor Selection, and the
Compensation Design Guidelines sections in the IC
data sheet to verify whether other components need
replacement for proper operation after reconfiguring
the output voltage.
f
(Hz) = 1011/(R40 + 1750) (Ω)
SW
The switching frequency can also be synchronized to
an external digital clock signal connected to the EV kit
SYNC PCB pad. For proper synchronization, the exter-
nal signal frequency must be at least 20ꢀ higher than
3x the frequency programmed through resistor R40.
The digital clock signal should have peak amplitude of
3V to 5V, offset voltage of 1/2 the amplitude, frequency
in the 600kHz to 6.9MHz range, and a duty cycle of
50ꢀ. The MAX15003 IC switching frequency will be 1/3
the SYNC frequency. Refer to the Inductor Selection,
Input Capacitor Selection, and the Compensation
Design Guidelines sections in the MAX15003 IC data
sheet to verify whether other components need
replacement for proper operation after reconfiguring
the switching frequency.
Current Limit
The current limit for each MAX15003 EV kit output is set
with resistors. VOUT1 current limit is set to a nominal
4.5A, at room temperature, with resistors R44 and R23.
VOUT2 current limit is set to a nominal 6A, at room tem-
perature, with resistors R42 and R11. VOUT3 current
limit is set to a nominal 15A, at room temperature, with
resistors R43 and R35. To reconfigure the current limits,
refer to the Setting the Current Limit section in the
MAX15003 IC data sheet to calculate new resistor val-
ues for R44/R23, R42/R11, and R43/R35.
4
_______________________________________________________________________________________
MAX15003 Evaluation Kit
Evluates:MAX1503
Table 2. Track/Sequence Operation (Jumper JU1)
EV KIT VOUT_
OPERATION
SHUNT POSITION
SEL PIN CONNECTION
EV KIT CIRCUIT MODIFICATIONS
Ratiometric tracking
mode*
Open resistors (R2, R26)
Short/0Ω resistors (R3, R27)
1-2*
Connected to REG
Connected to SGND
Coincident tracking
mode
Calculate values for resistors R2, R3, R26, and R27
2-3
Sequence mode
*Default position.
Output Sequencing/Tracking
Phase Operation
The three DC-DC converters can switch in phase or at
120° out-of-phase. Operating the converters in the out-
of-phase mode increases the input capacitor ripple fre-
quency, reduces the RMS input ripple current, and thus
the size of the input bypass capacitor requirement. EV
kit jumper JU2 is used to configure the phase mode
operation. See Table 3 for jumper JU2 configuration.
The MAX15003 IC can be programmed to power up
and power down the three outputs in sequence, ratio-
metric tracking, or coincident tracking mode by config-
uring the SEL pin. The MAX15003 EV kit features jumper
JU1 to configure the SEL pin. See Table 2 for jumper
JU1 configuration. The EV kit circuit is configured for
ratiometric tracking operation by default (resistors R3
and R27 shorted with PC trace), and can be easily mod-
ified for sequencing or coincident tracking. In ratiomet-
ric tracking mode, the soft-start controllers for VOUT1,
VOUT2, and VOUT3 are synchonized, and hence their
respective output voltages will track ratiometrically.
Table 3. Phase Mode (Jumper JU2)
SHUNT
POSITION
PHASE PIN
CONNECTION
EV KIT OPERATION
1-2
Connected to REG
Connected to SGND
In-phase mode
In concident tracking mode, the VOUT2 and VOUT3
output voltages ramp up, tracking the VOUT1 voltage
depending on the resistor-divider ratio used for R2/R3
and R26/R27, respectively.
2-3*
120° out-of-phase mode
*Default position.
In sequencing mode, VOUT2 and VOUT3 outputs do
not turn on until the voltage at the IC EN/TRACK_ input
pin for each output reaches 1.22V. The ratio of resistor
pairs R2/R3 and R26/R27 set the voltage threshold that
VOUT1 must reach before VOUT2 and VOUT3 are
turned on.
Status Output Signals
The MAX15003 EV kit provides PGOOD1, PGOOD2,
and PGOOD3 logic output signals to indicate the regu-
lation state of VOUT1, VOUT2, and VOUT3. A logic-low
at the PGOOD_ pads indicates that output voltage has
dropped below 92.5ꢀ of its regulation voltage. Each
PGOOD_ signal is pulled high to the respective VOUT_
voltage when in regulation. The EV kit also provides a
RESET logic output signal that indicates when all three
PGOOD outputs are logic-high. The RESET output is
pulled high (5V) after all three PGOOD signals are
pulled high and a timeout period of 22ms has elapsed.
Use the following equation to calculate the new capaci-
tor value for C22 to modify the timeout period:
For sequencing or concident tracking operation, the EV
kit PCB requires modification. Cut open the shorting PCB
trace at resistors R3 and R27 and install resistors R2, R3,
R26, and R27. Refer to the Coincident/Ratiometric
Tracking (SEL, EN/TRACK_) and the Output-Voltage
Sequencing (SEL, EN/TRACK_, PGOOD) sections in the
MAX15003 IC data sheet to calculate the proper values
for resistors R2, R3, R26, and R27.
2μA × TTIMEOUT
C22 =
2V
_______________________________________________________________________________________
5
MAX15003 Evaluation Kit
Evluates:MAX1503
Figure 1. MAX15003 EV Kit Schematic
6
_______________________________________________________________________________________
MAX15003 Evaluation Kit
Evluates:MAX1503
Figure 2. MAX15003 EV Kit Component Placement Guide—Component Side
_______________________________________________________________________________________
7
MAX15003 Evaluation Kit
Evluates:MAX1503
Figure 3. MAX15003 EV Kit PCB Layout—Component Side
8
_______________________________________________________________________________________
MAX15003 Evaluation Kit
Evluates:MAX1503
Figure 4. MAX15003 EV Kit PCB Layout—Layer 2 (Ground Layer)
_______________________________________________________________________________________
9
MAX15003 Evaluation Kit
Evluates:MAX1503
Figure 5. MAX15003 EV Kit PCB Layout—Layer 3 (Power Layer)
10 ______________________________________________________________________________________
MAX15003 Evaluation Kit
Evluates:MAX1503
Figure 6. MAX15003 EV Kit PCB Layout—Solder Side
______________________________________________________________________________________ 11
MAX15003 Evaluation Kit
Evluates:MAX1503
Figure 7. MAX15003 EV Kit Component Placement Guide—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.
12 ____________________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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