Evaluates: MAX17552 (µMAX) in 5V
Output-Voltage Application
MAX17552 5V Output Evaluation
Kit (µMAX)
General Description
The MAX17552 5V evaluation kit (EV kit) (µMAX®) is
a fully assembled and tested circuit board that demon-
strates the performance of the MAX17552 60V, 100mA
ultra-small, high-efficiency, synchronous step-down
DC-DC converter in a 10-pin µMAX package. The EV
kit operates over a wide input voltage range of 6V to
60V and provides up to 100mA load current at 5V out-
put. It draws only 26µA supply current under no-load
conditions (EN/UVLO connected to VIN). The EV kit is
programmed to switch at a frequency of 220kHz and
delivers a peak efficiency of 93% with the supplied
components. The device is simple to use and easily con-
figurable with minimal external components. It features
cycle-by-cycle peak current-limit protection, undervoltage
lockout and thermal shutdown.
The EV kit comes installed with the MAX17552AUB+ in
an 10-pin (3mm x 3mm), lead(Pb)-free/RoHS-compliant
µMAX package.
Features and Benets
●6V to 60V Input Voltage Range
●5V Output, 100mA Continuous Current
●93% Peak Efficiency
●26µA No-Load Supply Current
●EN/UVLO for On/Off Control and Programmable
Input Undervoltage Lockout
●Programmable Switching Frequency
●Internal or Programmable Soft-Start
●PFM or Forced-PWM Mode of Operation
●RESET Output
●Peak Current-Limit Protection
●Thermal Shutdown
●Proven PCB Layout
●Fully Assembled and Tested
Quick Start
Recommended Equipment
●MAX17552 5V EV kit (µMAX)
●60V adjustable, 0.5A DC power supply
●Electronic load up to 100mA
●Voltmeter
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.
1) Verify that shunts are installed on jumpers JU1 and
JU2 (EN/UVLO).
2)
Verify that jumper JU3 (MODE-PFM operation) is open.
3) Set the electronic load to constant-current mode,
100mA, and disable the electronic load.
4) Connect the electronic load’s positive terminal to the
VOUT PCB pad. Connect the negative terminal to
the GND PCB pad.
5) Connect the voltmeter across the VOUT and GND
PCB pads.
6) Set the power-supply output to 24V. Disable the
power supply.
7) Connect the power-supply output to the VIN PCB
pad. Connect the supply ground to the GND PCB
pad.
8) Turn on the power supply.
9) Enable the electronic load and verify that output
voltage is 5V with respect to GND.
10) Vary the input voltage from 6V to 60V.
11) Vary the load current from 1mA to 100mA and verify
that output voltage is 5V with respect to GND.
Note: While performing an output short-circuit test, it is
possible for the ceramic output capacitor to oscillate with
the wiring inductance between the capacitor and short-
circuited load, and thereby cause the absolute maximum
rating of VOUT pin (-0.3V) to be exceeded. The resistor
(R7) and the capacitor (C5) are included on this EV kit to
protect against unintentional violation of the above men-
tioned rating. In the actual system design, parasitic board
or wiring inductance should be minimized and the output-
voltage waveform under short-circuit operation should be
verified to ensure that the absolute maximum rating of
VOUT pin is not exceeded.
19-6906; Rev 1; 4/14
Ordering Information appears at end of data sheet.
μMAX is a registered trademark of Maxim Integrated Products,
Inc.
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Evaluates: MAX17552 (µMAX) in 5V
Output-Voltage Application
MAX17552 5V Output Evaluation Kit
(µMAX)
Detailed Description
The MAX17552 5V EV kit (µMAX) is a fully assembled and
tested circuit board that demonstrates the performance
of the MAX17552 60V, 100mA ultra-small, high-efficiency,
synchronous step-down DC-DC converter in a 10-pin
µMAX package. The EV kit operates over a wide input
voltage range of 6V to 60V and provides up to 100mA
load current at 5V output. It draws only 26µA supply
current under no-load conditions
(EN/UVLO
connected to VIN)
. The EV kit is programmed to
switch at a frequency of 220kHz and delivers a peak
efficiency of 93% with the supplied components. The
device is simple to use and easily configurable with minimal
external components. It features cycle-by-cycle peak
current-limit protection, undervoltage lockout and thermal
shutdown.
The EV kit includes an EN/UVLO PCB pad and jumpers
JU1 and JU2 to enable control of the converter output.
The MODE PCB pad and jumper JU3 are provided for
selecting the mode of operation of the converter. RESET
PCB pad is available for monitoring the RESET output.
The RT/SYNC PCB pad can be used to synchronize the
EV kit switching frequency to an external clock frequency.
Enable Control (JU1, JU2)
The EN/UVLO pin on the EV kit serves as an on/off control
while also allowing the user to program the input under-
voltage lockout (UVLO) threshold. Jumpers JU1 and JU2
configure the EV kit’s output for turn-on/turn-off control.
See Table 1 for proper JU1, JU2 jumper configurations.
Additionally, resistors R1 and R2 are included to set the
UVLO to a desired turn-on voltage. Refer to the Setting
the Input Undervoltage-Lockout Level section in the
MAX17552 IC data sheet for additional information on
setting the UVLO threshold voltage.
RESET Output
The EV kit provides a PCB pad to monitor the status of
the RESET output. RESET goes high when output volt-
age rises above 95% (typ) of its nominal regulated output
voltage. RESET goes low when output voltage falls below
92% (typ) of its nominal regulated voltage.
PFM or Forced-PWM Mode (MODE)
The EV kit includes a jumper (JU3) to select the mode
of operation of the converter. Install a shunt across JU3
before powering up the EV kit to enable the forced-PWM
operation. Keep JU3 open to enable the light-load PFM
operation. See Table 2 for proper JU3 settings.
Soft-Start
The EV kit offers a fixed 5ms soft-start time. Connect the
capacitor C4 to adjust the soft-start time (tSS). Use the
following equation to determine the soft-start capacitance
value (CSS):
CSS = 6.25 x tSS
where tSS is in milliseconds and CSS is in nanofarads.
External Synchronization (RT/SYNC)
The EV kit provides a PCB pad to synchronize the EV
kit switching frequency to an external clock frequency.
Apply the external clock to the RT/SYNC PCB pad
though an AC-coupling capacitor. Refer to the External
Synchronization section in the MAX17552 IC data sheet
for additional information on configuring the external
clock and selecting the AC-coupling capacitor.
Table 1. Enable Control (EN/UVLO) (JU1, JU2)
Table 2. MODE Control (JU3)
*Default position.
*Default position.
SHUNT POSITION EN/UVLO PIN VOUT OUTPUT
JU1 JU2
1-2 Open Connected to VIN Enabled
Open 1-2 Connected to GND Disabled
1-2* 1-2 Connected to midpoint of R1/R2 resistor-divider Enabled at VIN ≥ 6V
SHUNT POSITION MODE PIN MODE OF OPERATION
1-2 Connected to GND Forced PWM
Open* Unconnected PFM
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Evaluates: MAX17552 (µMAX) in 5V
Output-Voltage Application
MAX17552 5V Output Evaluation Kit
(µMAX)
EV Kit Performance Report
0
10
20
30
40
50
60
70
80
90
100
110 100
EFFICIENCY (%)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
toc1
VIN = 24V VIN = 36V
VIN = 12V
PFM MODE
0
10
20
30
40
50
60
70
80
90
100
020 40 60 80 100
EFFICIENCY (%)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT toc2
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 60V
PWM MODE
4.96
4.99
5.02
5.05
5.08
020 40 60 80 100
OUTPUT VOLTAGE (V)
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. LOAD CURRENT toc3
PFM MODE
VIN = 24V
VIN = 48V, 60V
VIN = 12V
VIN = 36V
4.984
4.986
4.988
4.99
4.992
4.994
020 40 60 80 100
OUTPUT VOLTAGE (V)
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. LOAD CURRENT toc4
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 60V
PWM MODE
100mV/div
50mA/div
toc5
200µs/div
VOUT(AC)
IOUT
LOAD TRANSIENT RESPONSE,
PFM MODE (LOAD CURRENT STEPPED
FROM 5mA to 50mA)
100mV/div
50mA/div
toc6
100µs/div
VOUT(AC)
IOUT
LOAD TRANSIENT RESPONSE
PFM OR PWM MODE (LOAD CURRENT
STEPPED FROM 50mA TO 100mA)
100mV/div
50mA/div
toc7
100µs/div
VOUT(AC)
IOUT
LOAD TRANSIENT RESPONSE
PWM MODE (LOAD CURRENT STEPPED
FROM NO LOAD TO 50mA)
2V/div
5V/div
toc8
1ms/div
VEN/UVLO
VOUT 50mA/div
5V/div
SOFT-START
IOUT
VRESET
toc9
BODE PLOT
fCR = 8.5kHz,
PHASE MARGIN = 64°
PHASE
GAIN
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Evaluates: MAX17552 (µMAX) in 5V
Output-Voltage Application
MAX17552 5V Output Evaluation Kit
(µMAX)
Component List
Component Suppliers
Note: Indicate that you are using the MAX17552AUB when contacting these component suppliers.
DESIGNATION QTY DESCRIPTION
C1 1
22µF, 100V electrolytic capacitor
(8.3mm x 8.3mm)
Panasonic EEVFK2A220P
C2 1
1µF ±10%, 100V X7R ceramic
capacitor (1206)
Murata GRM31CR72A105K
C3 1
10µF ±10%, 6.3V X7R ceramic
capacitor (1206)
Murata GRM31CR70J106K
C4 0 Not installed, ceramic capacitor
C5 1
0.22µF ±10%, 16V X7R ceramic
capacitor (0402)
Murata GRM155R71C224K
JU1–JU3 3 2-pin headers
L1 1 220µH, 235mA inductor
Coilcraft, Inc. LPS5030-224ML
DESIGNATION QTY DESCRIPTION
R1 1 3.01MΩ ±1% resistor (0402)
R2 1 787kΩ ±1% resistor (0402)
R3 1 191kΩ ±1% resistor (0402)
R4 1 261kΩ ±1% resistor (0402)
R5 1 49.9kΩ ±1% resistor (0402)
R6 1 100kΩ ±1% resistor (0402)
R7 1 22.1Ω ±1% resistor (0402)
U1 1
60V, 100mA, ultra-small, high-
efciency, synchronous step-down
DC-DC converter with 22µA no-
load supply current (10 µMAX)
Maxim MAX17552AUB+
— 3 Shunts
— 1 PCB: MAX17552AUB-5V
EVALUATION KIT
SUPPLIER PHONE WEBSITE
Coilcraft, Inc. 847-639-6400 www.coilcraft.com
Murata Americas 770-436-1300 www.murataamericas.com
Panasonic Corp. 800-344-2112 www.panasonic.com
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Evaluates: MAX17552 (µMAX) in 5V
Output-Voltage Application
MAX17552 5V Output Evaluation Kit
(µMAX)
Figure 1. MAX17552 5V EV Kit (µMAX) Schematic
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Evaluates: MAX17552 (µMAX) in 5V
Output-Voltage Application
MAX17552 5V Output Evaluation Kit
(µMAX)
Figure 2. MAX17552 5V EV Kit (µMAX) Component Placement
Guide—Component Side
Figure 3. MAX17552 5V EV Kit (µMAX) PCB Layout—
Component Side
Figure 4. MAX17552 5V EV Kit (µMAX) PCB Layout—Solder
Side
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Evaluates: MAX17552 (µMAX) in 5V
Output-Voltage Application
MAX17552 5V Output Evaluation Kit
(µMAX)
#Denotes RoHS compliant.
PART TYPE
MAX17552AUBEVKIT# EV Kit
Ordering Information
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 specications without notice at any time.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2014 Maxim Integrated Products, Inc.
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Evaluates: MAX17552 (µMAX) in 5V
Output-Voltage Application
MAX17552 5V Output Evaluation Kit
(µMAX)
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 1/14 Initial release —
1 4/14 Updated Ordering Information table 7
Revision History
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.
