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MAXM17552 Evaluation Kit
Evaluates: MAXM17552
5V Output-Voltage Application
General Description
The MAXM17552 evaluation kit (EV kit) is a demon-
stration circuit of the MAXM17552 ultra-small, high effi-
ciency, current mode, synchronous step-down DC-DC
switching power module. The EV kit operates over a
wide input-voltage of 14V to 60V and provides up to
100mA load current with a 5V output voltage. The EV
kit is programmed to switch at a frequency of 450kHz.
The module is simple to use and easily configurable
with minimal external components. It features cycle-by-
cycle peak current-limit protection, undervoltage lockout
(EN/UVLO), and thermal shutdown.
The EV kit comes with the compact 10-pin 2.6mm x
3mm x 1.5mm uSLIC™ package MAXM17552 module
installed, and is rated to operate over the full industrial/
automotive -40°C to +125°C temperature range. For full
specifications, features and benifits of the IC, refer to the
MAXM17552 data sheet.
Quick Start
Recommended Equipment
●
60V DC power supply
● Dummy load capable of sinking 100mA
●
Digital voltmeter (DVM)
●
100MHz dual-trace oscilloscope
●
MAXM17552EVKIT#, MAXM17552 evaluation kit
Procedure
The MAXM17552 EV kit is fully assembled and tested.
Please follow the steps below to verify the board opera-
tion.
Caution: Do not turn on the power supply until all
connections are completed.
1)
2)
3)
Set the power supply at a voltage between 14V and
60V. Disable the power supply.
Connect the positive and negative terminals of the
power supply to VIN and GND PCB pads, respectively.
Connect the positive and negative terminals of the
100mA load to VOUT and GND PCB pads respec-
tively, and the set the load to 0A.
Connect the DVM across the VOUT PCB pad and the
GND PCB pad closest to VOUT PCB pad.
Enable the input power supply.
Verify the DVM across output display 5V.
Increase the load up to 100mA to verify the output
voltage is 5V using DVM.
Features
●
Wide 14V to 60V Input
● ±1.75% Feedback Voltage Accuracy
●
Output: 5V,100mA
●
Internally Compensated
●
All Ceramic Capacitors and Ultra-Compact Solution
●
PFM or Forced-PWM Mode of Operation
● Shutdown Current as Low as 1.2μA (typ)
● Programmable Soft-Start and Prebias Startup
●
Open-Drain Power Good Output (RESET pin)
● Programmable EN/UVLO Threshold
●
Hiccup Overcurrent Protection (OCP)
●
Overtemperature Protection (OTP)
●
-40°C to +125°C Industrial/Automotive
Temperature Range
●
Complies with CISPR22 (EN55022) Class B
Conducted and Radiated Emissions
● Passes Drop, Shock, and Vibration Standards—
JESD22–B103, B104, B111
4)
5)
6)
7)
Ordering Information
appears at end of data sheet.
uSLIC is a trademark of Maxim Integrated Products, Inc.
319-100076; Rev 1; 10/18
MAXM17552 Evaluation Kit
Evaluates: MAXM17552
5V Output-Voltage Application
operates in a constant-frequency forced-PWM mode at
all loads. The mode of operation cannot be changed on-
the-fly during normal operation of the device. Refer to the
MAXM17552 module datasheet for more information on
the PWM and PFM modes of operation.
Table 1
shows
EV kit jumper settings that can be used to configure the
desired mode of operation.
Detailed Description of Hardware
The MAXM17552 EV kit is a proven circuit to demonstrate
the high-voltage, high-efficiency, and compact solution
size of the MAXM17552 synchronous step-down DC-DC
power module. The output voltage is preset to 5V to
operate from 14V to 60V input and provides up to 100mA
load current. The optimal frequency is set at 450kHz to
maximize efficiency and minimize component size. The
EV kit includes two test points, TP1 for monitoring the LX
and TP2 for measuring the
RESET
voltage.
External Synchronization (RT/SYNC)
Soft-Start Input (SS)
The module offers a fixed 5.1ms internal soft-start when
the SS pin is left unconnected. When adjustable soft-start
time is required, connect a capacitor from SS to GND to
program the soft-start time. The minimum soft-start time is
related to the output capacitance (C
OUT
) and the output
voltage (V
OUT
) by the following equation:
t
SS
> 0.05 x C
OUT
x V
OUT
where t
SS
is in milliseconds and C
OUT
is in µF.
Soft-start time (t
SS
) is related to the capacitor connected
at SS (C
3
) by the following equation:
C
3
= 6.25 x t
SS
where t
SS
is in ms and C
3
is in nF.
The RT/SYNC pin can be used to synchronize module’s
internal oscillator to an external system clock. Refer to
the
External Synchronization
section in the
MAXM17552
data sheet
for additional information on configuring the
external clock synchronization.
Reset Output (RESET)
The module includes an open-drain
RESET
output to
monitor output voltage.
RESET
should be pulled up with
an external resistor to the desired external power supply
less than or equal to 5.5V.
RESET
goes high-impedance
2ms after the output rises above 95% of its nominal set
value and pulls low when the output voltage falls below
92% of the set nominal output voltage.
RESET
asserts low
during the hiccup timeout period. In this EV kit, R7 resistor
is used to pull up the
RESET
to the output voltage.
Mode Selection (MODE)
Table 1. Mode Configuration (JU1)
JU1 POSITION
1-2
Not Installed
MODE PIN
Connected to GND
Open
MAXM17552
OPERATION
PWM mode
PFM mode
The device features a MODE pin for selecting either
forced-PWM or PFM mode of operation. If the MODE pin
is left unconnected, the device operates in PFM mode
at light loads. If the MODE pin is grounded, the device
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MAXM17552 Evaluation Kit
Evaluates: MAXM17552
5V Output-Voltage Application
EV Kit Performance Report
EFFICIENCY vs. LOAD CURRENT
(5V OUTPUT, PWM MODE, f
SW
= 450KHZ)
100
90
80
toc01
100
90
80
EFFICIENCY vs. LOAD CURRENT
(5V OUTPUT, PFM
MODE,
f
SW
= 450kHz)
toc02
EFFICIENCY (%)
EFFICIENCY (%)
70
60
50
40
30
20
10
0
20
40
60
80
100
V
IN
= 24V
V
IN
= 14V
V
IN
= 42V
V
IN
= 60V
70
60
50
40
30
20
10
1
V
IN
= 60V
V
IN
= 48V
10
LOAD CURRENT (mA)
100
V
IN
= 24V
V
IN
= 36V
LOAD CURRENT (mA)
LOAD AND LINE REGULATION
(5V OUTPUT, PWM MODE)
5.05
5.00
4.95
OUTPUT VOLTAGE vs. LOAD CURRENT
(5V OUTPUT, PFM MODE)
toc03
5.2
V
IN
= 60V
5.1
toc04
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
4.90
4.85
4.80
4.75
4.70
V
IN
= 14V
V
IN
= 42V
V
IN
= 24V
V
IN
= 60V
5.0
4.9
4.8
4.7
V
IN
= 48V
V
IN
= 36V
V
IN
= 24V
0
10
20
30
40
50
60
70
80
90 100
0
20
40
60
80
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT TRANSIENT RESPONSE
(PWM MODE
V
IN
= 24V, V
OUT
= 5V, I
OUT
= 0.05A TO 0.1A)
toc05
V
OUT
50mV/div
(AC
COUPLED)
I
OUT
50mA/div
100µs/div
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│
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MAXM17552 Evaluation Kit
Evaluates: MAXM17552
5V Output-Voltage Application
EV Kit Performance Report (continued)
LOAD CURRENT TRANSIENT RESPONSE
(PFM MODE
V
IN
= 24V, V
OUT
= 5V, I
OUT
= 25mA TO 75mA)
BODE PLOT
(V
IN
= 24V, I
OUT
= 0.1A)
40
30
20
PHASE
toc07
toc06
80
70
60
GAIN (dB)
0
-10
-20
-30
-40
1.E+03
f
CR
= 22.3kHz,
PHASE MARGIN = 65.2°
1.E+04
GAIN
40
30
20
10
0
1.E+05
50mA/div
I
OUT
200µs/div
CONDUCTED EMISSION PLOT
(WITH FILTER L = 10µH, C = 1µF)
70
CISPR-22 CLASS B QP LIMIT
toc08
RADIATED EMISSION PLOT
(NO FILTER)
70
60
50
toc09
60
50
CISPR-22 CLASS B AVG LIMIT
AMPLTIUDE (dbµV/m)
40
CISPR-22 CLASS B QP LIMIT
30
20
10
0
VERTICAL
SCAN
AMPLTIUDE (dbµV)
40
PEAK EMISSIONS
30
20
10
AVG EMISSIONS
0
0.15
1
FREQUENCY (MHz)
CONDITIONS: V
IN
= 24V, V
OUT
= 5V, LOAD = 0.1A
10
30
30
HORIZONTAL
SCAN
100
FREQUENCY (MHz)
CONDITIONS: V
IN
= 24V, V
OUT
= 5V, LOAD = 0.1A
1000
-10
30
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Maxim Integrated
│
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PHASE (°)
V
OUT
100mV/div
(AC
COUPLED)
10
50
MAXM17552 Evaluation Kit
Evaluates: MAXM17552
5V Output-Voltage Application
MAXM17552 EV Kit Bill of Materials
ITEM
1
2
3
4
5
6
7
8
9
10
11
12
13
REF_DES QTY
MFG PART #
C1
1
C2012X7S2A105K125
C2
1 GRM21BZ71E106KE15
C5
C7, C11
R1
R2
R3
R4
R7
U1
C3
C4
R5
1
2
1
1
1
1
1
1
0
0
0
EEE-FK1J220XP
GCM155R71H104KE02
CRCW0402261KFK
CRCW040249K9FK
CRCW040293K1FKED
RC0402JR-070RL
ERJ-2RKF1003X
MAXM17552AMB+
N/A
N/A
N/A
MANUFACTURER
TDK
MURATA
PANASONIC
MURATA
VISHAY DALE
VISHAY DALE
VISHAY DALE
YAGEO PHYCOMP
PANASONIC
MAXIM
N/A
N/A
N/A
VALUE
1UF
10UF
22UF
0.1UF
261K
49.9K
93.1K
0
100K
MAXM17552AMB+
OPEN
OPEN
OPEN
DESCRIPTION
CAPACITOR; SMT (0805); CERAMIC CHIP; 1UF; 100V; TOL=10%; TG=-55 DEGC TO +125 DEGC; TC=X7S
CAPACITOR; SMT (0805); CERAMIC CHIP; 10UF; 25V; TOL=10%; TG=-55 DEGC TO +125 DEGC; TC=X7R
CAPACITOR; SMT (CASE_D8); ALUMINUM-ELECTROLYTIC; 22UF; 63V; TOL=20%; TG=-55 DEGC TO +105 DEGC; AUTO
CAPACITOR; SMT (0402); CERAMIC CHIP; 0.1UF; 50V; TOL=10%; TG=-55 DEGC TO +125 DEGC; TC=X7R
RESISTOR; 0402; 261K OHM; 1%; 100PPM; 0.063W; METAL FILM
RESISTOR; 0402; 49.9K; 1%; 100PPM; 0.0625W; THICK FILM
RESISTOR; 0402; 93.1K OHM; 1%; 100PPM; 0.063W; METAL FILM
RESISTOR; 0402; 0 OHM; 5%; JUMPER; 0.063W; THICK FILM
RESISTOR; 0402; 100K OHM; 1%; 100PPM; 0.10W; THICK FILM
EVKIT PART-IC; COMPACT HIGH VOLTAGE; HIGH-EFFICIENCY STEP-DOWN POWER MODULE; PKG. CODE: M102A3+1
PACKAGE OUTLINE 0402 NON-POLAR CAPACITOR
PACKAGE OUTLINE 0805 NON-POLAR CAPACITOR
PACKAGE OUTLINE 0402 RESISTOR
Ordering Information
PART
MAXM17552EVKIT#
#Denotes RoHS compliant.
TYPE
EV KIT
Component Suppliers
SUPPLIER
Murata Americas
Panasonic Corp.
WEBSITE
www.murata.com
www.panasonic.com
www.maximintegrated.com
Maxim Integrated
│
5
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