MAX17501ATEVKIT [MAXIM]
Operates from a 4.5V to 60V Input Supply;
| 型号： | MAX17501ATEVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Operates from a 4.5V to 60V Input Supply |
| 文件： | 总10页 (文件大小：1296K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX17501A/MAX17501E Evaluation Kits
Evaluate: MAX17501A/MAX17501E
in TDFN Packages
General Description
Features
The MAX17501A/MAX17501E evaluation kits (EV kits)
provide proven designs to evaluate the MAX17501A/
MAX17501E high-efficiency, high-voltage, synchronous
step-down DC-DC converters. The EV kits use these
devices to generate a fixed 3.3V, at load currents
up to 500mA, from a 4.5V to 60V input supply. The
MAX17501A supports a PFM control scheme with high
light-load efficiency, while the MAX17501E features a
forced-PWM control scheme that provides constant
switching-frequency operation at all load and line condi-
tions.
S Operates from a 4.5V to 60V Input Supply
S 3.3V Fixed Output Voltage
S 500mA Output Current
S 600kHz Switching Frequency
S Enable/UVLO Input
S Resistor-Programmable UVLO Threshold
S Open-Drain RESET Output
S Overcurrent and Overtemperature Protection
S PFM/PWM (MAX17501A EV Kit)
S PWM (MAX17501E EV Kit)
S Proven PCB Layout
Ordering Information appears at end of data sheet.
S Fully Assembled and Tested
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
3-pin header
JU1
1
1FF Q10%, 100V X7R ceramic
capacitor (1206)
Murata GRM31CR72A105KA01L
C1
1
33FH, 1.4A inductor
(6mm x 6mm x 3.5mm)
Coilcraft LPS6235-333ML
L1
1
1FF Q10%, 6.3V X7R ceramic
capacitor (0603)
Murata GRM188R70J105K
C2
C3
C4
C7
1
1
1
1
R1
R2
1
1
1
1
0
3.32MIQ1% resistor (0402)
866kIQ1% resistor (0402)
100Iresistor (0402)
R4
3300pF Q10%, 50V X7R ceramic
capacitor (0402)
Murata GRM155R71H332K
R6
10kIQ1% resistor (0402)
Not installed, test points
TP1, TP2
See the EV Kit-Specific
Component List
10FF Q10%, 10V X7R ceramic
capacitor (1206)
Murata GRM31CR71A106K
U1
—
—
1
1
1
Shunt
PCB: See the EV Kit-Specific
Component List
33FF, 80V aluminum
electrolytic (D = 8mm)
Panasonic EEEFK1K330P
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-6435; Rev 1; 10/13
MAX17501A/MAX17501E Evaluation Kits
Evaluate: MAX17501A/MAX17501E
in TDFN Packages
EV Kit-Specific Component List
EV KIT
DESIGNATION
DESCRIPTION
Buck converter (10 TDFN-EP*)
Maxim MAX17501AATB+
U1
—
MAX17501ATEVKIT#
PCB: MAX17501AT EVALUATION KIT
Buck converter (10 TDFN-EP*)
Maxim MAX17501EATB+
U1
—
MAX17501ETEVKIT#
PCB: MAX17501ET EVALUATION KIT
*EP = Exposed pad.
Component Suppliers
SUPPLIER
PHONE
WEBSITE
www.coilcraft.com
Coilcraft, Inc.
847-639-6400
770-436-1300
800-344-2112
Murata Electronics North America, Inc.
Panasonic Corp.
www.murata-northamerica.com
www.panasonic.com
Note: Indicate that you are using the MAX17501 when contacting these component suppliers.
To turn on/turn off the part from EN/UVLO, follow the
stepsꢀbelow:
Quick Start
Recommended Equipment
•ꢀ MAX17501AꢀorꢀMAX17501EꢀEVꢀkit
1) Remove resistors R1 and R2 and the jumper installed
across pins 1-2 on jumper JU1.
•ꢀ 4.5Vꢀtoꢀ60V,ꢀ1AꢀDCꢀinputꢀpowerꢀsupply
•ꢀ Loadꢀcapableꢀofꢀsinkingꢀ500mA
•ꢀ Digitalꢀvoltmeterꢀ(DVM)
2) Connect the power supply to the EV kit and turn on
the power supply. Set the power supply at a voltage
betweenꢀ4.5Vꢀandꢀ60V.
3) Connect the function generator output to the
EN/UVLO test loop.
•ꢀ Functionꢀgenerator
Procedure
4) EN/UVLO rising threshold is 1.24V and falling thresh-
old is 1.11V. Make sure that the voltage-high and
voltage-low levels of the function generator output are
greater than 1.24V and less than 1.11V, respectively.
TheꢀEVꢀkitsꢀareꢀfullyꢀassembledꢀandꢀtested.ꢀFollowꢀtheꢀstepsꢀ
belowꢀtoꢀverifyꢀboardꢀoperation.ꢀCaution: Do not turn on
power supply until all connections are completed.
1)ꢀ Setꢀtheꢀpowerꢀsupplyꢀatꢀaꢀvoltageꢀbetweenꢀ4.5Vꢀandꢀ
60V.ꢀDisableꢀtheꢀpowerꢀsupply.
5) When powering down the EV kits, first disconnect the
function generator output from the EN/UVLO test loop
and then turn off the DC power supply.
2) Connect the positive terminal of the power supply
to the VIN PCB pad and the negative terminal to the
nearest PGND PCB pad. Connect the positive termi-
nal of the 500mA load to the VOUT PCB pad and the
negative terminal to the nearest PGND PCB pad.
Careꢀshouldꢀbeꢀtakenꢀinꢀboardꢀlayoutꢀandꢀsystemsꢀwiringꢀ
toꢀpreventꢀviolationꢀofꢀtheꢀabsoluteꢀmaximumꢀratingꢀofꢀtheꢀ
FB/VO pin under short-circuit conditions. Under such con-
ditions,ꢀitꢀisꢀpossibleꢀforꢀtheꢀceramicꢀoutputꢀcapacitorꢀtoꢀ
oscillateꢀwithꢀtheꢀboardꢀorꢀwiringꢀinductanceꢀbetweenꢀtheꢀ
capacitorꢀandꢀshort-circuitedꢀload,ꢀandꢀtherebyꢀcauseꢀtheꢀ
absoluteꢀmaximumꢀratingꢀofꢀFB/VOꢀ(-0.3V)ꢀtoꢀbeꢀexceed-
ed.ꢀThisꢀ parasiticꢀ boardꢀ orꢀ wiringꢀ inductanceꢀ shouldꢀ beꢀ
minimized and the output voltage waveform under short-
circuitꢀ operationꢀ shouldꢀ beꢀ verifiedꢀ toꢀ ensureꢀ thatꢀ theꢀ
absoluteꢀmaximumꢀratingꢀofꢀFB/VOꢀisꢀnotꢀexceeded.
3) Connect the DVM across the VOUT PCB pad and the
nearest PGND PCB pad.
4) Verify that a shunt is installed across pins 1-2 on
jumper JU1.
5) Turn on the DC power supply.
6)ꢀ Enableꢀtheꢀload.
7) Verify that the DVM displays the expected voltage.
2
MAX17501A/MAX17501E Evaluation Kits
Evaluate: MAX17501A/MAX17501E
in TDFN Packages
where t is the required soft-start time in milliseconds
SS
and C3 is in nanofarads.
Detailed Description of Hardware
The MAX17501A/MAX17501E EV kits provide proven
designs to evaluate the MAX17501A/MAX17501E high-
efficiency, high-voltage, synchronous step-down DC-DC
converters. The EV kits generate a fixed 3.3V, at load
currents up to 500mA, from a 4.5V to 60V input sup-
ply. The EV kits feature a 600kHz fixed switching fre-
quency for optimum efficiency and component size. The
MAX17501A EV kit supports a PFM control scheme with
high light-load efficiency, while the MAX17501E EV kit
features a forced-PWM control scheme that provides
constant switching-frequency operation at all load and
line conditions.
Regulator Enable/Undervoltage-
Lockout Level (EN/UVLO)
The devices feature an EN/UVLO input. For normal
operation,ꢀaꢀshuntꢀshouldꢀbeꢀinstalledꢀacrossꢀpinsꢀ1-2ꢀonꢀ
jumperꢀJU1.ꢀToꢀdisableꢀtheꢀoutput,ꢀinstallꢀaꢀshuntꢀacrossꢀ
pins 2-3 on JU1 and the EN/UVLO pin is pulled to GND.
SeeꢀTableꢀ1ꢀforꢀJU1ꢀsettings.
Setting the Undervoltage-Lockout Level
Theꢀ devicesꢀ offerꢀ anꢀ adjustableꢀ inputꢀ undervoltage-
lockout level. Set the voltage at which the device turns
on with a resistive voltage-divider connected from VIN to
GND. Connect the center node of the divider to EN/UVLO.
The EV kits include an EN/UVLO PCB pad and jumper
JU1ꢀ toꢀ enableꢀ controlꢀ ofꢀ theꢀ converterꢀ output.ꢀ Anꢀ
additional RESETꢀ PCBꢀ padꢀ isꢀ availableꢀ forꢀ monitor-
ing the converter output. The VCC PCB pad helps
measure the internal LDO voltage.
ChooseꢀR1ꢀtoꢀbeꢀ3.3MIand then calculate R2 as follows:
R1×1.218
R2 =
(V
−1.218)
INU
Soft-Start Input (SS)
Theꢀ devicesꢀ utilizeꢀ anꢀ adjustableꢀ soft-startꢀ functionꢀ toꢀ
limit inrush current during startup. The soft-start time is
adjustedꢀbyꢀtheꢀvalueꢀofꢀC3,ꢀtheꢀexternalꢀcapacitorꢀfromꢀ
SS to GND. To adjust the soft-start time, determine C3
using the following formula:
where V
to turn on.
is the voltage at which the device is required
INU
C3 = 5.55 x t
SS
Table 1. Regulator Enable (EN/UVLO) Jumper JU1 Settings
SHUNT POSITION
EN/UVLO PIN
MAX17501_ OUTPUT
1-2*
Connected to IN
Enabled
Connected to the center node of
resistor-divider R1 and R2
Enabled,ꢀUVLOꢀlevelꢀset
through the R1 and R2 resistor-divider
Not installed
2-3
Connected to GND
Disabled
*Default position.
3
MAX17501A/MAX17501E Evaluation Kits
Evaluate: MAX17501A/MAX17501E
in TDFN Packages
EV Kits Performance Report
LOAD AND LINE REGULATION
(MAX17501A)
EFFICIENCY vs. LOAD CURRENT
(MAX17501A)
100
90
80
70
60
50
40
30
3.45
3.40
3.35
3.30
3.25
VIN = 36V
VIN = 24V
VIN = 36V
VIN = 12V
VIN = 24V
VIN = 12V
10
1
100
0
50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure 1. MAX17501A Load and Line Regulation
Figure 3. MAX17501A Efficiency
LOAD AND LINE REGULATION
EFFICIENCY vs. LOAD CURRENT
(MAX17501E)
(MAX17501E)
3.320
95
90
85
80
75
70
65
60
55
50
45
3.315
3.310
3.305
3.300
VIN = 24V
VIN = 36V
VIN = 12V
VIN = 36V
VIN = 24V
VIN = 12V
3.295
3.290
0
50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
50 100 150 200 250 300 350 400 450 500
LOAD CURRENT (mA)
Figure 2. MAX17501E Load and Line Regulation
Figure 4. MAX17501E Efficiency
4
MAX17501A/MAX17501E Evaluation Kits
Evaluate: MAX17501A/MAX17501E
in TDFN Packages
EV Kits Performance Report (continued)
V
(AC)
OUT
50mV/div
f
= 51kHz
CR
PM = 55°
I
OUT
100mA/div
4
5
6
7 8 9 1
2
20µs/div
Figure 7. MAX17501E No Load to 250mA Load Transient
Figure 5. MAX17501A/MAX17501E Full-Load Bode Plot
(VIN = 24V)
V
(AC)
OUT
100mV/div
V
(AC)
OUT
50mV/div
I
OUT
200mA/div
I
OUT
100mA/div
200µs/div
20µs/div
Figure 6. MAX17501A 5mA to 255mA Load Transient
Figure 8. MAX17501A/MAX17501E 250mA to 500mA Load
Transient
5
MAX17501A/MAX17501E Evaluation Kits
Evaluate: MAX17501A/MAX17501E
in TDFN Packages
VOUT
TP1
L1
VOUT
33µH
PGND
VIN
10
9
1
2
3
4
5
LX
PGND
VIN
C4
10µF
3.3V/500mA
R4
100
TP2
VIN
PGND
VOUT
GND
C7
33µF
C1
1µF
U1
R6
10k
1%
MAX17501
VIN
RESET
8
7
EN/UVLO
VCC
RESET
N.C.
EN/UVLO
GND
VCC
GND
C2
1µF
6
FB/ VO
SS
C3
3300pF
EP
VIN
R1
3.32M
1%
JU1
2
1
3
EN/UVLO
R2
866k
1%
Figure 9. MAX17501A/MAX17501E EV Kits Schematic
6
MAX17501A/MAX17501E Evaluation Kits
Evaluate: MAX17501A/MAX17501E
in TDFN Packages
1
1
1
1
1
2
2
1
2
2
1
1
1
1
2
1
2
1
1
2
1
2
1
1
2
1
2
1
1
2
1
2
1
2
3
4
5
10
9
1
2
3
4
5
10
9
1
2
1
2
8
8
7
7
6
6
2
2
2
1
2
1
1
1
2
1
2
1
1
2
1
2
1
2
3
1
2
3
1
1
2
2
1
1
2
2
1
2
1
2
1
1
1
1
1.0”
1.0”
Figure 10. MAX17501A EV Kit Component Placement Guide—
Component Side
Figure 12. MAX17501A/MAX17501E EV Kits PCB Layout—
Component Side
1
1
1
1
1
2
2
1
2
2
1
1
1
1
2
1
1
2
1
1
2
1
1
2
1
2
3
4
5
10
9
1
2
8
7
6
2
2
1
1
2
1
1
2
1
1
2
1
2
3
1
2
3
1
1
2
2
1
1
2
2
1
2
2
1
1
1
1
1.0”
1.0”
Figure 11. MAX17501E EV Kit Component Placement Guide—
Component Side
Figure 13. MAX17501A/MAX17501E EV Kits PCB Layout—
Solder Side
7
MAX17501A/MAX17501E Evaluation Kits
Evaluate: MAX17501A/MAX17501E
in TDFN Packages
1.0”
1.0”
Figure 14. MAX17501A/MAX17501E EV Kits PCB Layout—Top
Solder Mask
Figure 15. MAX17501A/MAX17501E EV Kits PCB Layout—
Bottom Solder Mask
8
MAX17501A/MAX17501E Evaluation Kits
Evaluate: MAX17501A/MAX17501E
in TDFN Packages
Ordering Information
PART
TYPE
EV Kit
EV Kit
MAX17501ATEVKIT#
MAX17501ETEVKIT#
#Denotes RoHS compliant.
9
MAX17501A/MAX17501E Evaluation Kits
Evaluate: MAX17501A/MAX17501E
in TDFN Packages
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
8/12
Initial release
—
Replaced the R4 resistor value from 0W to 100W in the Component List and Figure
9 schematic; added new paragraph to the Procedureꢀsectionꢀaboutꢀpreventingꢀ
violationꢀofꢀtheꢀabsꢀmaxꢀratingꢀforꢀFB/VO
1
10/13
1, 2, 6
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max
limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
10
©
2013 Maxim Integrated Products, Inc.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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