Analog Devices MAX17553C EV Kit A User manual

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MAX17553C Evaluation Kit
Evaluates: MAX17553 (MAX17553C)
319-100899; Rev 1; 4/22
One Analog Way, Wilmington, MA 01887 U.S.A. | Tel: [phone] | © 2022 Analog Devices, Inc. All rights reserved.
General Description
The MAX17553C evaluation kit (EV kit) is a fully
assembled and tested circuit board that demonstrates
the performance of the MAX17553C, a 4V to 60V, 50mA,
Ultra-Small, High Efficiency, Synchronous Step-Down
DC-DC converter in an 8-pin TDFN (2mm x 2mm)
package. The EV kit is designed to operate over a 14V
to 60V input and provides a 12V, 50mA output. The EV
kit is set up to turn ON at 20V(max) and turn OFF at
14V(max) using EN/UV and HYST pins. The step-down
converter is programmed to switch at a 400kHz
frequency and delivers a peak efficiency of 95% with
supplied components.
The EV kit is simple to use and easily configurable with
minimal external components. The MAX17553C
features programmable input EN/UV and HYST
threshold, programmable frequency, and an open-drain
RESET signal. The device offers built-in hiccup mode
protection for over-load and short circuit conditions, and
thermal shutdown. The EV kit is complaint with CISPR32
class B standard.
Features
•14V to 60V Input-Voltage Range for the Step-Down
Converter
•12V Output Voltage, Up To 50mA Continuous Load
Current
•95% Peak Efficiency
•Minimum Number of External Components
•400kHz Switching Frequency
•Resistor Programmable Input Enable-Undervoltage
(EN/UV) and Hysteresis (HYST)
•Internal Loop Compensation
•3.2ms (typ) Internal Soft-Start Time
•Open-Drain RESET Output to Monitor Output Voltage
•Hiccup-mode Overcurrent and Overtemperature
Protection
•Proven PCB Layout
•Fully Assembled and Tested
Ordering Information appears at end of data sheet.
EV Kit Photo

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Quick Start
Configuration Diagram
GND GND
VOUT
LOAD
A
+ -
V
+
-
VIN
DC
POWER
SUPPLY
A
+ -
MAX17553C EV KIT
Figure 1. MAX17553C EV Kit Setup Diagram
Required Equipment
•MAX17553CEVKIT#
•One 13V to 60V DC, 50mA power supply
•One 5V DC, 5mA power supply
•Load resistors capable of sinking up to 50mA at 12V
•Digital multimeters (DMM)
EV Kit Setup and Procedure
A typical bench setup for the MAX17553C EV kits is shown in Figure 1.
The EV kit is fully assembled and tested. Follow the steps to verify and test the operation of individual converters.
Warning:
•Do not turn on the power supply until all connections are completed.
•Do not touch any part of the circuit with bare hands or conductive materials when powered up.
•Make sure all high-voltage capacitors are fully discharged before handling. Allow five minutes after disconnecting the
input power source before touching circuit parts.
Equipment Setup and Procedure
1. Set the power supply to a voltage between 20V and 60V. Disable the power supply.
2. Connect the positive terminal of the 60V power supply to the VIN PCB pad and the negative terminal to the nearest
GND PCB pad. Connect the positive terminal of the 50mA load to the VOUT PCB pad and the negative terminal to
the nearest GND PCB pad.
3. Set the digital multimeter to voltage mode and connect across the VOUT PCB pad and the nearest GND PCB pad.
4. Connect the positive terminal of the 5V power supply to the VEXT PCB pad and the negative terminal to the nearest
GND PCB pad.
5. Enable both power supplies.
6. Verify that the output voltmeter displays 12V and, if required, measure the output current using a DMM in ammeter
mode.
7. If required, vary the input voltage from 14V to 60V and the load current from 0mA to 50mA, then verify that the output
voltage is 12V with respect to GND.

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Detailed Description
The MAX17553C EV kit provides a proven design to evaluate the MAX17553C, a 4V to 60V, 50mA ultra-small, high
efficiency, synchronous step-down DC-DC converter. The EV kit comes with installed components for delivering 12V,
50mA (max) output current from a 14V to 60V input. The EV kit can be used to verify the EN/UV and HYST features of
the MAX17553C. The EV kit is programmed to switch at a fixed frequency of 400kHz. The EV kit can be programmed to
switch at different frequency with an appropriate output inductor (L1) and an output capacitor (C6). The EV kit can also
be used to verify the output overload or short circuit protection as well as the thermal shutdown protection. Refer to the
MAX17553C IC data sheet to change the EV kit configuration to a different specification.
Setting the Input EN/UV Level with HYST
The device offers an adjustable input undervoltage and adjustable hysteresis levels. Set the voltage at which the device
turns on and turns off with a resistor network connected between IN, EN/UV, HYST, and GND pins (see Figure 2). Choose
and R3 as follows:
  
󰇛󰇜  
   
󰇡󰇛󰇜   󰇛 󰇜󰇢
where VIN(ON) and VIN(OFF) are the voltages at which the device is required to turn on and turn off respectively. Refer to
the MAX17553 IC data sheet for more information.
EN/UV
VIN
R1
R2
IN
HYST
R3
Figure 2. Setting the Input Undervoltage Level with Hysteresis
Adjusting the Output Voltage
The output voltage of MAX17553C can be programmed from 0.8V to 0.9 x VIN. Set the output voltage by using a resistive
feedback divider from output to GND (see Figure 3).Connect the center node of the divider to the FB pin. Choose RB
Uwith the following equation:
  󰇟
  󰇠
FB/VO
VOUT
MAX17553C RU
RB
Figure 3. Setting the Output Voltage

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RESET Output
The MAX17553C RESET pin has a maximum 6V voltage rating. The EV kit provides a VEXT PCB pad for connecting the
pullup voltage of the RESET pin. The EV kit also provides a RESET PCB pad to monitor the stepdown converter output.
RESET goes to high impedance 30µs after the step-down converter outputs rise above 95% of the programmed output
voltage. RESET goes low when the regulator output voltage drops below 92% (typ) of the programmed output voltage.
RESET also goes low when EN/UV voltage falls below its threshold value. Refer to the MAX17553 IC data sheet for more
information.
Hot Plug-In and Long Input Cables
The MAX17553CEVKIT# PCB layout provides an optional electrolytic capacitor (C5). This capacitor limits the peak
voltage at the input of the converter when the DC input source is hot-plugged to the EV kit input terminals with long input
cables. The equivalent series resistance (ESR) of the electrolytic capacitor dampens the oscillations caused by interaction
between the inductance of the long input cables and the ceramic capacitors at the buck converter input.
Electromagnetic Interference
Compliance to conducted emission (CE) standards requires an electromagnetic interference (EMI) filter at the input of a
switching power converter. The EMI filter attenuates high-frequency currents drawn by the switching power converter and
limits the noise injected back into the input power source.
The MAX17553CEVKIT# has designated footprints for the placement of conducted EMI filter components as per the bill
of materials (BOM). Use of these filter components results in lower conducted EMI below CISPR32 Class B limits. Cut
open the trace at L2 before installing conducted EMI filter components. The EV kit layout is also designed to limit radiated
emissions from switching nodes of the power converter and complies with CISPR32 Class B RE limits.

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MAX17553C EV Kits Performance
(VIN = VEN = 24V, TA= +25°C, unless otherwise noted.)

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MAX17553C EV Kit Bill of Materials
ITEM
QTY
DESIGNATOR
DESCRIPTION
MANUFACTURER PART NUMBER
1
1
C1
0.1F, 10%, 100V, X7R,Ceramic capacitor (0603)
MURATA GRM188R72A104KA35
2
1
C4
1F, 10%, 100V, X7R,Ceramic capacitor (1206)
TDK C3216X7R2A105K160AA
3
1
C5

PANASONIC EEE-TG2A220UP
4
1
C6
4.7F, 10%, 25V, X7R,Ceramic capacitor (0805)
TDK C2012X7R1E475K125AB
5
1
C10
0.1F, 10%, 16V, X7R, Ceramic capacitor (0402)
MURATA GRM155R71C104KA88
6
1
R1

VISHAY CRCW04023M32FK
7
1
R2

VISHAY CRCW0402287KFK
8
1
R3

VISHAY CRCW0402953KFKEDC
9
1
R4
resistor (0402)
PANASONIC ERJ-2RKF1183
10
1
R5

VISHAY CRCW0402100KFK
11
1
R6

PANASONIC ERJ-2RKF6983
12
1
R7

PANASONIC ERJ-2RKF4992
13
1
L1

COILCRAFT LPS4018-224MR
14
1
U1
4V to 60V, 50mA, Step-Down DC-DC Converter
MAXIM MAX17553CATA+
15
0
L2

COILCRAFT LPS3015-153MR
16
0
C2
Ceramic capacitor (0805)
NA
17
0
C8
Ceramic capacitor (1206)
NA

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MAX17553C EV Kit Schematic Diagram
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Evaluates: MAX17553 (MAX17553C)
MAX17553C Evaluation
Kit
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Analog Devices | 8
MAX17553C EV Kit PCB Layout
MAX17553C EV Kit PCB Layout—Top Silkscreen
MAX17553C EV Kit PCB Layout—Top Layer
MAX17553C EV Kit PCB Layout—Layer 2
MAX17553C EV Kit PCB Layout—Layer 3

Evaluates: MAX17553 (MAX17553C)
MAX17553C Evaluation
Kit
www.analog.com
Analog Devices | 9
MAX17553C EV Kit PCB Layout
(continued)
MAX17553C EV Kit PCB Layout—Bottom Layer
MAX17553C EV Kit PCB Layout—Bottom Silkscreen
Ordering Information
PART NUMBER
TYPE
MAX17553CEVKIT#
EV Kit
#Denotes RoHS compliance.
Component Suppliers
SUPPLIER
WEBSITE
Coilcraft Inc
www.coilcraft.com
Murata Americas
www.murata.com
Vishay Intertechnology
www.vishay.com
Panasonic Corp
www.panasonic.com

Evaluates: MAX17553 (MAX17553C)
MAX17553C Evaluation
Kit
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0
3/22
Initial release

1
4/22
Updated part number in header
All Pages
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is
assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that
may result from its use. Specifications subject to change without notice. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the
property of their respective owners.
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