MAX15020EVKIT+ [MAXIM]
Space-Saving 5mm x 5mm, 20-pin TQFN Package;
| 型号： | MAX15020EVKIT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Space-Saving 5mm x 5mm, 20-pin TQFN Package |
| 文件： | 总7页 (文件大小：417K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Evaluates: MAX15020
MAX15020 Evaluation Kit
General Description
Quick Start
The MAX15020 evaluation kit (EV kit) is a fully assembled
and tested PCB that evaluates the MAX15020 PWM step-
down regulator IC with an integrated high-side switch.
The MAX15020 is equipped with a reference input for the
feedback error amplifier, allowing dynamic output-voltage
programming. The MAX15020 EV kit operates over a wide
input-voltage range of 7.5V to 40V and provides up to 2A.
Recommended Equipment
Before beginning, the following equipment is needed:
•
•
•
7.5V to 40V adjustable, 3A power supply
15Ω resistive load rated for 75W or greater
Two digital voltmeters
Procedure
The MAX15020 internal switching frequency can be
set to either 300kHz or 500kHz. The MAX15020 EV kit
features a SYNC input to provide external frequency
synchronization for sensitive applications. The EV kit uses
a MAX15020 step-down regulator in a 20-pin thin QFN
package. The MAX15020 IC operates over the automotive
temperature range of -40°C to +125°C and is suitable for
printers and industrial applications.
The MAX15020 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) Verify that a shunt is not installed at jumper JU1
(default 32V turn-on voltage).
2) Verify that shunts are installed on pins 1-2 of jumpers
JU2 (REFIN = REFOUT) and JU3 (300kHz switching
frequency).
Features
● Wide 7.5V to 40V Input Range
3) Connect the resistive load between the OUT PCB pad
and the PGND PCB pad.
● Dynamic Output-Voltage Control from 0.8V to 36V
with 2A Load
4) Connect digital voltmeters across the IN and PGND
● Selectable 300kHz/500kHz Switching Frequency
● Turn-On/Off Control
pads, and the OUT and PGND pads on the EV kit board.
5) Connect the power supply’s positive terminal to the IN
PCB pad on the EV kit, and connect the power-supply
ground terminal to the PGND PCB pad.
● Demonstrates MAX15020 IC Low Shutdown Current
● High Efficiency Up to 96% (V = 36V, V
= 30V,
OUT
IN
I
= 2A)
LOAD
6) Turn on the power supply.
● Demonstrates MAX15020 IC Overcurrent and
Thermal Protection
7) Set the power-supply voltage to 36V.
8) Verify that the voltmeter at OUT measures 30V.
● Space-Saving 5mm x 5mm, 20-pin TQFN Package
● Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX15020EVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
19-0804; Rev 3; 5/15
Evaluates: MAX15020
MAX15020 Evaluation Kit
Table 2. Jumper JU2 Reference-Voltage
Detailed Description of Hardware
The MAX15020 EV kit circuit uses a MAX15020 step-
down regulator IC (U1) to implement a step-down DC-DC
regulator circuit. The EV kit operates over a 7.5V to
40V input range. The circuit provides a dynamically
programmable output range of 0.8V to 36V and can
deliver up to 2A of current with excellent line and load
regulation. The MAX15020 step-down regulator features an
Input
SHUNT
LOCATION
REFIN PIN
V
OUT
Connects directly to
REFOUT
1-2*
30V
Externally controlled by Dependent on voltage
REFIN_EXT voltage at REFIN_EXT
2-3
internal high-side-low R
MOSFET to achieve higher
DS(ON)
*Default position.
efficiency and lower overall system cost. The MAX15020
also features configurable soft-start, shutdown control,
cycle-by-cycle current limit, hiccup-mode output short-
circuit protection, and thermal shutdown. The undervoltage
lockout (UVLO) threshold is configurable by choosing the
appropriate R1 and R2 resistors.
Frequency Selection
Jumper JU3 selects the MAX15020 operating switching
frequency between 300kHz or 500kHz. See Table 3 for
switching frequency selection.
Configuring the Output Voltage (OUT)
The MAX15020 EV kit features a selectable 300kHz
or 500kHz switching-frequency operation, in addition
to a SYNC input that can be used to synchronize the
MAX15020 to frequencies operating in the 300kHz to
500kHz range. An external reference input (REFIN_EXT)
is available to dynamically change the output voltage.
The MAX15020 EV kit step-down regulator output
voltage is configured to 30V by resistors R7 and R8,
and with REFIN = REFOUT. The EV kit’s output voltage
(OUT) can be reconfigured in the range of 0.8V to 36V by
replacing resistors R7 and R8. To select a new value for
resistor R8, refer to the Compensation Design section in
the MAX15020 IC data sheet. Use the following equation
to reconfigure the output voltage to the desired value:
Jumper Selection
ON/OFF Mode
The MAX15020 EV kit features a ON/OFF mode that
reduces the MAX15020 supply current to 6μA (typ).
The 3-pin jumper JU1 selects the ON/OFF mode for
the MAX15020 EV kit. See Table 1 for jumper JU1
configurations
R7
R8 =
V
OUT
−1
V
REFIN
where V
is the desired output voltage in volts, V
REFIN
OUT
REFIN_EXT Input
is the voltage supplied by REFOUT or REFIN_EXT, and R7
is typically 10kΩ.
The MAX15020 features a reference input for the internal
error amplifier. The voltage applied to REFIN_EXT PCB
pad is used to dynamically change the circuit’s output volt-
age. Jumper JU2 connects REFIN to REFOUT to use the
MAX15020’s 1V internal reference voltage. See Table 2 for
jumper JU2 configurations. To change the MAX15020 EV
kit output voltage using REFIN_EXT, refer to the Setting
the Output Voltage section in the MAX15020 IC data sheet.
The MAX15020 output voltage can also be adjusted
dynamically by driving REFIN_EXT between 0 and 3.6V.
To use the REFIN_EXT input, place a shunt across pins
2-3 of jumper JU2.
Table 3. Jumper JU3 Frequency Selection
Table 1. Jumper JU1 ON/OFF Mode
SHUNT
SHUNT
MAX15020 SWITCHING
MAX15020 OUTPUT
ON/OFF PIN
FSEL PIN
LOCATION
LOCATION
FREQUENCY
1-2
2-3
Connects to V directly MAX15020 enabled
IN
1-2*
2-3
Connects to VREG
Connects to GND
300kHz
500kHz
Connects to GND
MAX15020 disabled
Connects to V through MAX15020 enabled at
*Default position. When operating the MAX15020 with an exter-
nal clock signal at SYNC, place the shunt on pins 1-2. Refer to
the Oscillator/Sychronization Input section of the MAX15020 IC
data sheet for more information.
IN
None*
R1 and R2 resistors
V
@ 32V
IN
*Default position.
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Evaluates: MAX15020
MAX15020 Evaluation Kit
Reconfiguring the MAX15020 EV kit for a new output
voltage may require replacing inductor L1 and capacitors
C1 and/or C6. To select a new value for inductor L1 and
capacitors C1 and C6, refer to the Inductor Selection,
Output Capacitor Selection, and Input Capacitor Selection
sections, respectively, in the MAX15020 IC data sheet.
Synchronization Input (SYNC)
The MAX15020 EV kit circuit features a selectable
300kHz or 500kHz switching frequency. Jumper JU3 sets
the internal switching frequency. The EV kit’s SYNC PCB
pad can be used to synchronize the MAX15020 with an
external digital clock in the range of 300kHz to 500kHz.
When SYNC is driven with an external digital clock, the
MAX15020 synchronizes to the rising edge of the external
clock.
Configuring the ON/OFF Threshold
The MAX15020 EV kit turn-on threshold is configured to
32V with resistors R1 and R2. The MAX15020 turns on
The digital square-wave clock source must provide the
following signal qualities:
when the input voltage (V ) is approximately above 32V
IN
and ON/OFF is ≥ 1.23V. The ON/OFF threshold can be
reconfigured to a desired value by appropriately selecting
resistors R1 and R2. Refer to the Setting the ON/OFF
Threshold section in the MAX15020 IC data sheet. To
reconfigure the UVLO threshold, use the following equation:
•
Output voltage: Logic-low = 0 to 0.8V, logic-high =
2V to 5.5V
•
Input frequency = 300kHz to 500kHz (refer to the
MAX15020 IC data sheet for more information on the
SYNC input)
V
UVLO
R1 = R2 ×
−1
•
Minimum pulse width = 200ns
1.23
To use external synchronization, connect the external
where resistor R1 should be in the range of 100kΩ and
is the desired UVLO threshold in volts.
square-wave clock to the SYNC and GND pads.
V
UVLO
Place a shunt across pins 1-2 of jumper JU1 for always-on
operation, which bypasses the on/off threshold. Resistor R11
is utilized to prevent excessive power dissipation in resistor
R2 when the shunt at jumper JU1 is installed on pins 1-2.
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Evaluates: MAX15020
MAX15020 Evaluation Kit
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
560µF ±20%, 50V low ESR
electrolytic capacitors
(12.5mm x 25mm)
100V, 150mA Schottky diode
(SOD-123) Vishay BAT46W
D2
JU1–JU3
L1
1
3
1
C1, C6
2
3-pin headers
SANYO 50ME560WX
22µH, 4.7A inductor
Sumida CDRH127/LDNP-220MC
1µF ±10%, 25V X7R ceramic
capacitors (0805)
TDK C2012X7R1E105K
C2, C4,
C10
3
4
1
1
1
R1
R2
1
1
2
1
2
1
1
1
1
4
97.6kΩ ±1% resistor (0603)
4.02kΩ ±1% resistor (0603)
10kΩ ±5% resistors (0603)
10Ω ±5% resistor (0603)
10kΩ ±1% resistors (0603)
340Ω ±1% resistor (0603)
15.8kΩ ±1% resistor (0603)
0Ω ±5% resistor (0603)
0.1µF ±10%, 50V X7R ceramic
capacitors (0603)
TDK C1608X7R1H104K
C3, C5,
C7, C9
R3, R4
R5
0.22µF ±10%, 50V X7R ceramic
capacitor (0805)
Murata GRM21BR71H224K
R6, R7
R8
C8
R9
0.027µF ±10%, 50V X7R ceramic
capacitor (0603)
AVX 06035C273KAT2A
R10
C11
C12
R11
20kΩ ±1% resistor (0603)
PC mini red test points
TP1–TP4
0.1µF ±10%, 50V X7R ceramic
capacitor (0805)
TDK C2012X7R1H104K
PWM step-down regulator (20
TQFN) (5mm x 5mm x 0.8mm)
Maxim MAX15020ATP+
U1
1
330pF ±5%, 50V C0G ceramic
capacitor (0603)
TDK C1608C0G1H331J
—
—
3
1
Shunts (JU1–JU3)
C13
D1
1
1
PCB: MAX15020 EVALUATION
KIT+
60V, 3A Schottky diode (SMA)
Diodes Inc. B360A
Component Suppliers
SUPPLIER
AVX Corp.
PHONE
WEBSITE
843-448-9411
805-446-4800
770-436-1300
619-661-6835
847-545-6700
847-803-6100
203-268-6261
www.avxcorp.com
Diodes Inc.
www.diodes.com
Murata Americas
SANYO
www.murataamericas.com
www.sanyodevice.com
www.sumida.com
Sumida Corp.
TDK Corp.
www.component.tdk.com
www.vishay.com
Vishay
Note: Indicate that you are using the MAX15020 when contact-
ing these component suppliers.
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Evaluates: MAX15020
MAX15020 Evaluation Kit
Figure 1. MAX15020 EV Kit Schematic
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Evaluates: MAX15020
MAX15020 Evaluation Kit
1.0”
1.0”
Figure 3. MAX15020 EV Kit PCB Layout—Component Side
Figure 2. MAX15020 EV Kit Component Placement Guide—
Component Side
1.0”
Figure 4. MAX15020 EV Kit PCB Layout—GND Layer 2
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Evaluates: MAX15020
MAX15020 Evaluation Kit
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
REVISION DESCRIPTION
0
1
2
3
4/07
11/07
6/08
5/15
Initial release
—
Updated Ordering Information table format; corrections to Procedures (step 2),
Configuring ON/OFF Threshold, and Figure 1.
1–4
1
Changed part number for C13 in Component List.
Deleted automotive reference in General Description section; moved Quick Start
section to page 1 and Component List and Component Suppliers tables to page 4
1, 4
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.
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.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2015 Maxim Integrated Products, Inc.
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