MAX15059A [MAXIM]
Demonstrates Thermal-Shutdown Feature;
| 型号： | MAX15059A |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Demonstrates Thermal-Shutdown Feature |
| 文件： | 总6页 (文件大小：931K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-5281; Rev 0; 5/10
MAX15059 Evaluation Kit
General Description
Features
Sꢀ 2.8V_to_5.5V_Supply_Voltage_Range
Sꢀ 70V_Output_Voltage_(Approximate)
Sꢀ 0_to_4mA_Output_Current
The MAX15059 evaluation kit (EV kit) demonstrates
the MAX15059 APD biasing pulse-width modulation
(PWM) step-up DC-DC converter with an internal power
switch, current monitor, and adjustable current limiting.
The step-up converter switches at 400kHz. The EV kit
operates from a DC supply voltage of 2.8V to 5.5V and
is configured to deliver approximately 70V, and 0 to
4mA of current at the output. The output voltage can be
configured from VIN + 5V to 76V by replacing a resis-
tor or adjusting the CNTRL voltage. The EV kit dem-
onstrates the IC’s APD fast current-limit, undervoltage-
lockout (UVLO), and thermal-shutdown features.
Sꢀ Demonstrates_APD_Fast_Current_Limit
Sꢀ Demonstrates_Undervoltage_Lockout
Sꢀ Demonstrates_Thermal-Shutdown_Feature
Sꢀ MOUT_Output_Overvoltage_Protection_Through_
Clamping_Circuit
Sꢀ Fully_Assembled_and_Tested
The EV kit also features an APD input load-simula-
tor circuit for current monitoring and step-response
measurements.
Ordering Information
The EV kit comes with the MAX15059AETE+ installed,
but can also be used to evaluate the MAX15059BETE+.
PART
TYPE
MAX15059EVKIT+
EV Kit
Warning:_ Voltages_ exceeding_ 42V_ may_ exist_ on_ the_
VOUT,_APD,_MOUT,_and_PGND_PCB_pads.
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
2-pin headers
JU1, JU3
JU2
2
1
1FF Q10%, 10V X5R ceramic
capacitor (0402)
Murata GRM155R61A105K
C1
C3
1
1
2
3-pin header
4.7FH, 1.5A inductor
Coilcraft ME3220-472MLB
L1
1
0.1FF Q10%, 16V X7R ceramic
capacitor (0402)
Murata GRM155R71C104K
100V, 1.5A n-channel MOSFET
(SOT23)
Vishay Si2328DS-T1-E3
(Top Mark: CHV)
N1
1
0.1FF Q10%, 100V X7R ceramic
capacitors (0805)
C4, C5
AVX 08051C104KAT
R1
1
1
1
1
1
1
1
1
1
3
2
1
348kI Q1% resistor (0603)
6.34kI Q1% resistor (0402)
1kI Q1% resistor (0402)
2.87kI Q1% resistor (0402)
10kI Q1% resistor (0402)
10kI Q1% resistor (0805)
20kI Q1% resistor (1206)
3.3kI Q1% resistor (0805)
100I Q1% resistor (0402)
PC mini red test points
0.01FF Q10%, 100V X7R ceramic
capacitor (0805)
Murata GRM21BR72A103K
R2
C6
C7
C9
1
0
1
R3
R5
Not installed, ceramic capacitor
(0402)
R6
R7
R8
10FF Q10%, 10V X5R ceramic
capacitor (0805)
Murata GRM219R61A106K
R9
R10
100V, 150mA Schottky diode
(SOD123)
Diodes Inc. BAT46W-7-F
(Top Mark: L6)
TP1, TP2, TP4
TP3, TP6
TP5
D1
1
PC mini black test points
PC mini yellow test point
_ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ _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.
MAX15059 Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
—
3
Shunts
APD boost converter
(16 TQFN-EP*)
Maxim MAX15059AETE+
U1
1
PCB: MAX15059 EVALUATION
KIT+
—
1
*EP = Exposed pad.
Component Suppliers
SUPPLIER
PHONE
WEBSITE
AVX Corporation
Coilcraft, Inc.
843-946-0238
847-639-6400
805-446-4800
770-436-1300
402-563-6866
www.avxcorp.com
www.coilcraft.com
Diodes Inforporated
Murata Electronics North America, Inc.
Vishay
www.diodes.com
www.murata-northamerica.com
www.vishay.com
Note: Indicate that you are using the MAX15059 when contacting these component suppliers.
Quick Start
Required Equipment
Detailed Description of Hardware
The MAX15059 EV kit demonstrates the MAX15059
in a small, 16-pin TQFN package with internal power
switch, current monitor, and adjustable current-limiting
circuit features. The circuit’s PWM step-up DC-DC
converter is designed for APD biasing, switches at
400kHz, and is configured to deliver approximately
70V, and 0 to 4mA of current to the APD output. The
output voltage can be reconfigured from VIN + 5V to
76V by replacing resistor R1, or adjusting the CNTRL
voltage. The EV kit demonstrates the IC’s APD fast
current-limit, UVLO, and thermal-shutdown features.
• MAX15059 EV kit
• 2.8V to 5.5V, 1A DC power supply
• 0 to 5mA adjustable load rated for at least 76V
• Digital multimeter (DMM)
Warning:_ Voltages_ exceeding_ 42V_ may_ exist_ on_ the_
VOUT,_APD,_MOUT,_and_PGND_PCB_pads.
Procedure
The 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.
The converter circuit’s PCB footprint is 8mm x 18mm.
The EV kit operates from a 2.8V to 5.5V DC supply volt-
age and provides up to 4mA at the APD output. The
EV kit’s APD load-simulator circuit is used for current
monitoring and step-response measurements. The cir-
cuit is comprised of MOSFET N1, resistors R7, R8, R9,
and test points TP1, TP2, and TP3 (SGND). Test point
TP4 provides access to the IC’s BIAS signal. Voltages_
exceeding_ 42V_ may_ exist_ on_ TP4._ Additionally, bulk
capacitor C9 is provided in case long connecting cables
are used to power the EV kit during lab evaluation.
Capacitor C9 is not required in a typical design.
1) Verify that a shunt is installed on jumper JU1
(70V output).
2) Verify that a shunt is installed on pins 1-2 of jumper
JU2 (enabled).
3) Verify that a shunt is not installed on jumper JU3
(APD current limit is programmed by R5).
4) Connect the adjustable load to the APD and SGND
PCB pads.
SHDN and Enable
The EV kit features a jumper to enable and disable
U1. Jumper JU2 disables the EV kit when the shunt is
installed on pins 2-3. Installing the shunt on pins 1-2
enables the EV kit. Refer to the Shutdown section in the
MAX15059 IC data sheet for more information. See Table
1 for jumper JU2 settings.
5) Connect the power supply to the VIN pad and the
power-supply ground to the PGND pad.
6) Connect the DMM across the APD and SGND
PCB pads.
7) Turn on the power supply and set it to 3.3V.
8) Verify that the DMM reads approximately 70V.
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MAX15059 Evaluation Kit
Table_1._SHDN_and_Enable_(JU2)
Table_3._RLIM_(JU3)
SHUNT_POSITION
CURRENT-LIMIT_THRESHOLD
Default setting of 4.6mA
Programmed by R5
SHUNT_
POSITION
EV_KIT_OPERATION
SHDN_PIN
Installed
Not installed*
Connected to
VIN
1-2*
Enabled
Disabled
*Default position.
Connected to
SGND
2-3
Current-Monitor Output (MOUT)
and APD Load Simulator
*Default position.
The MOUT PCB pad provides a current-monitor out-
put that sources a current equal to the APD current
in the MAX15059A and 1/5th the APD current in the
MAX15059B. An RC network comprised of resistor R3
and capacitor C7 provide a filter to the MOUT signal.
Capacitor C7 is not required in a typical design.
Table_2._Output-Voltage_Programming_(JU1)
SHUNT_
POSITION
OUTPUT-VOLTAGE_
PROGRAMMING
CNTRL_PIN
Fixed output voltage:
Internal reference voltage
used.
Connected to
VIN
Installed*
Additionally, resistors R8 and R9 set the APD load-
simulator circuit’s current for current-monitor step-
response measurements. Apply a 0 to 11V square-wave
signal to the APD_DRV PCB pad to simulate a 0 to 4mA
load. Use test point TP1 or TP2 to measure the APD load
current and TP3 as the SGND.
Programmable output
Connected to voltage: Apply an
Not installed
external
reference
external reference
voltage (< 1.2V) at
CNTRL PCB pad.
Clamp Input (CLAMP)
CLAMP provides a means for diode clamping the
voltage at MOUT; thus, V
0.6V). CLAMP can be connected to either an external
supply or BIAS (TP4). Leave CLAMP unconnected if
voltage clamping is not required.
Fixed output voltage:
Apply an external
reference voltage
(> 1.3V)** at CNTRL PCB
pad; internal reference
voltage used.
is limited to (V
+
MOUT
CLAMP
Connected to
external
reference
Not installed
Setting Fast Current-Limit
Threshold and ILIM
*Default position.
**Apply a voltage > 1.3V to use the MAX15059 internal refer-
ence. The voltage should be 1.5V to VIN voltage. Refer to the
Adjusting the Feedback Set-Point/Reference Voltage section
in the MAX15059 IC data sheet for more information.
Resistor R5 sets the IC’s APD fast current-limit
threshold to 2.22mA. To reconfigure the circuit for
another current-limit threshold, replace resistor R5 and
use the following equation to calculate a new value for
the desired current:
Output-Voltage Programmability
The EV kit features a jumper to set the output
voltage (VOUT/APD) programmability. VOUT/APD is
programmed by connecting an external reference
voltage source to the CNTRL and SGND PCB
pads. Remove the shunt at jumper JU1 to use the
programmability feature and apply a reference voltage
< 1.2V to the CNTRL PCB pad. When the voltage
applied to the CNTRL pad is > 1.3V, the IC’s internal
reference is used. See Table 2 for jumper JU1 settings.
1.23V
R5(kΩ) =
×10 − 2.67kΩ
I
mA
(
)
LIM
where I
is the desired DC load current in milliamps.
LIM
Place a shunt on jumper JU3 to connect RLIM to SGND
and set the current-limit threshold to 4.6mA. See Table 3
for jumper JU3 settings.
The ILIM open-drain signal is available at the ILIM PCB
pad. During normal EV kit operation, resistor R6 pulls
up the ILIM pin to VIN. ILIM asserts low when the APD
current limit has been exceeded.
The output voltage at VOUT is set by resistors R1 and R2
to 70V when jumper JU1 is installed. To reconfigure the
output for a different voltage (VIN + 5V to 76V), select
a new surface-mount 0603 resistor for R1. Refer to the
Setting the Output Voltage section in the MAX15059 IC
data sheet for selecting the R1 value.
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MAX15059 Evaluation Kit
Figure 1. MAX15059 EV Kit Schematic
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MAX15059 Evaluation Kit
1.0”
1.0”
Figure 2. MAX15059 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX15059 EV Kit PCB Layout—Component Side
1.0”
Figure 4. MAX15059 EV Kit PCB Layout—Solder Side
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MAX15059 Evaluation Kit
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
5/10
Initial release
—
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.
6_____________________ ________ Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
©
2010 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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