Evaluates: MAX17558
MAX17558 Evaluation Kit
General Description
The MAX17558 EV kit provides a proven design to
evaluate the MAX17558 wide 4.5V to 60V input, dualoutput, synchronous step-down DC-DC controller. The EV
kit provides 5V/5A and 3.3V/10A at the outputs from a 6V
to 60V input supply. The switching frequency of the EV kit
is preset to 350kHz for optimal efficiency and component
size. The EV kit features adjustable input undervoltagelockout and soft-start time, selectable PWM/DCM modes,
180° out-of-phase/0° in-phase operation, current-limit
threshold, and independent open-drain PGOOD signals.
Features
●● 6V to 60V Input Range
●● Output Rails: VOUT1: 5V/5A, VOUT2: 3.3V/10A
●● 350kHz Switching Frequency
●● Independent Enable Inputs
●● Independent Adjustable Soft-Start Time
●● Configurable Tracking Operation
●● Selectable PWM/DCM Modes of Operation
●● Selectable 180° Out-of-Phase/0° In-Phase Operation
●● Selectable Current-Limit Threshold
●● Independent PGOOD Outputs
●● Overcurrent, Overvoltage, and Overtemperature
Protection
●● Proven PCB Layout
●● Fully Assembled and Tested
Ordering Information appears at end of data sheet.
Quick Start
Required Equipment
●●
MAX17558 EV kit
●●
4.5V to 60V, 15A DC power supply
●●
Loads capable of sinking 5A and 10A
●●
Two digital voltmeters (DVM)
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) Ensure that the DC power supply is disabled. Set the
power supply voltage to 24V.
2) Set one of the loads to 5A and the other to 10A. Disable
the load in the case of an electronic load. Leave the
load unconnected in the case of a resistor load and
ensure that the resistor power rating is high enough
to dissipate the output power.
3) Connect the positive terminal of the power supply to
the VIN connector and the negative terminal of the
power supply to PGND connector, which is nearest
to VIN connector.
4) Connect one digital voltmeter across VOUT1 connector and the nearest PGND connector with the
positive terminal of the DVM connected to VOUT1
connector.
5) Connect the other digital voltmeter across VOUT2
connector and the nearest PGND connector with the
positive terminal of the DVM connected to VOUT2
connector.
6) Verify the shunts on jumpers, as described in Table 1,
to select default settings of the EV kit.
7) Turn on the DC power supply.
8) Verify that the digital voltmeters display the expected
voltages (5V±1% on VOUT1 and 3.3V±1% on
VOUT2).
9) Enable the electronic load (connect the load in the
case of resistor load).
10) Verify that the voltmeters display the expected voltages
(5V±1% on VOUT1 and 3.3V±1% on VOUT2).
19-7640; Rev 0; 5/15
MAX17558 Evaluation Kit
Evaluates: MAX17558
Detailed Description of Hardware
The EV kit provides a proven design to evaluate the
device. The EV kit provides 5V/5A and 3.3V/10A at the
outputs from 6V to 60V input supply. The EV kit can also
operate over the 4.5V to 60V range to provide only 3.3V
output by connecting a shunt of JU4 at the 2-3 position to
disable the 5V output. The EV kit is preset to operate at
350kHz for optimum efficiency and component size.
The EV kit provides set resistors R16, R17 and R18, R19
and jumpers JU4, JU5 to enable/disable the output at a
desired input UVLO voltage. The DCM or PWM mode of
operation can be selected using JU3. JU1 allows selection
of 180°/0° phase-shift operation between the two controllers.
JU2 allows the selection of three different current-limit
thresholds for both controllers. Refer to Table 2 through
Table 4 for additional jumper setting details.
Configuring the Output Voltages (VOUT1, VOUT2)
The device’s output voltages (VOUT1 and VOUT2) can be
adjusted between 0.8V to 24V through sets of feedback
resistor-dividers (R6, R7 and R26, R27) by the following
formula:
R7 =
R6
V
( OUT1 − 1)
0.8
Please refer to the MAX17558 IC data sheet to select R6
resistor values and change compensation components, as
well as output capacitors, for new output voltage settings.
ramping voltage for output voltage reference. The softstart time of VOUT1 and VOUT2 are calculated based on
the following equation:
t ss_OUT1
= C21×
The default soft-start time on the EV kit is approximately
2.4ms.
Enable/Undervoltage-Lockout Level (EN_)
The device’s two controllers may be independently shut
down/enabled using the EN1 and EN2 pins. The EN_
pin can be programmed at 1.25V (typ) to detect the input
undervoltage-lockout at a desired input voltage to enable/
disable the corresponding controller with 50mV (typ)
hysteresis. Connect a resistor-divider to EN_ from VIN to
GND to program the input undervoltage-lockout threshold
to turn on/off the corresponding controller.
For normal operation, the device is enabled whenever the
input voltage is greater than 4.5V and JU4 and JU5 are
open. Set the voltage at which each controller turns on
by placing a shunt across pins 1-2 on JU4 and JU5, and
adjust the resistor-divider formed by R16, R17 for controller 1 and by R18, R19 for controller 2. Table 2 shows the
EV kit’s jumper settings for configuring the EN_ pin.
Select R17 (R19 for OUT2) below 10K and calculate the
R16 (R18) based on the following equation:
R16 =
Soft-Start (SS_)
The device offers an SS_ pin used to adjust the soft-start
time to limit inrush current during startup. Soft-start times
are controlled by the values of C21 and C30 for VOUT1
and VOUT2, respectively. An internal 5µA current source
charges the capacitor at the SS_ pin, providing a linear
0.8V
5µA
R17 × (VINUVLO − 1.25)
1.25
Where VINUVLO is the input voltage at which the controller is required to turn on.
Table 1. Default Setting of MAX17558 EV kit
JUMPER
SHUNT POSITION
JU1
Unconnected
JU2
1-2
Select 75mV current-limit threshold
JU3
1-2
Select the PWM mode of operation
JU4
Unconnected
Enable control 1
JU5
Unconnected
Enable control 2
www.maximintegrated.com
FUNCTION
Configure output 1 and output 2 180° out-of-phase operation
Maxim Integrated │ 2
MAX17558 Evaluation Kit
Evaluates: MAX17558
Mode Selection (SKIP)
Current-Limit Threshold Selection (JU2)
The device’s SKIP pin is used to select light-load operating mode among the PWM/DCM modes of operation.
Table 3 shows the EV kit’s jumper settings for configuring
the desired light-load operating mode.
The current-limit threshold of both of the device’s controllers can be selected using the JU2. Table 5 shows the EV
kit jumper settings for selecting the current-limit threshold.
Each controller’s peak current limit can be adjusted
independently by changing the values of R1 and R2. Note
that changing R1 and R2 values affect the stability and
current-sense signal across the current sense pins. Refer
to the “Current Sensing” section of the MAX17558 IC data
sheet for calculating the current-sense resistor value.
Phase Shift Between Controllers
JU1 can be configured to switch between 0° and 180°
phase-shift of the device’s two controllers. Table 4
shows the jumper configurations to select the phase-shift
between the two controllers.
Table 2. Enable Control (JU4, JU5)
JUMPER
SHUNT POSITION
EN
MAX17558 OUTPUT
Not installed
Unconnected
Enabled
1-2
Connected to the midpoint of
input UVLO divider
Enabled, UVLO level is set by the
resistor-divider from VIN to GND.
JU4
2-3
Connected to GND
Disabled
Not installed
Unconnected
Enabled
1-2
Connected to the midpoint of
input UVLO divider
Enabled, UVLO level is set by the
resistor-divider from VIN to GND.
2-3
Connected to GND
Disabled
JU5
Table 3. Mode Selection (JU3)
SHUNT POSITION
SKIP PIN
LIGHT-LOAD OPERATING MODE
1-2
Connected to VCCINT
PWM mode
2-3
Connected to VCCINT through a 100K resistor
DCM mode
Table 4. Phase-Shift Selection (JU1)
SHUNT POSITION
1-2
Not installed
SEL_PH PIN
PHASE-SHIFT
Connected to VCCINT
0°
Unconnected
180°
Table 5. Peak Current-Limit Threshold Selection (JU2)
SHUT POSITION
1-2
Not installed
2-3
www.maximintegrated.com
ILIM Pin
PEAK CURRENT LIMIT THRESHOLD
Connected to VCCINT
75mV
Unconnected
50mV
Connected to GND
30mV
Maxim Integrated │ 3
MAX17558 Evaluation Kit
Switching Frequency
The device’s switching frequency is set to 350kHz by
resistor R14. Replace R14 with another value to set the
switching frequency between 100kHz to 2200kHz. Use
the following equation to calculate R14 when reconfiguring
the switching frequency:
R RT =
(f SW + 133)
8.8
Where FSW is in kHz and R14 is in KΩ.
When reconfiguring the EV kit’s switching frequency,
it may be necessary to change the loop-compensation
network’s components to new values. Refer to the “Loop
Compensation” section in the MAX17558 IC data sheet
for computing new compensation component values.
Power-Good Outputs
The EV kit provides power-good output test points
(PGOOD1 and PGOOD2) to monitor the PGOOD1 and
PGOOD2 signals. The PGOOD signals are pulled-up to
VCCINT by R21 and R20. PGOOD1 and PGOOD2 are
high when VOUT1 and VOUT2, respectively, are within the
90%-110% range of their programmed output voltages.
When VOUT1 and VOUT2 are outside of the 90%-110%
range of their programmed output voltages, PGOOD1 and
PGOOD are pulled low, respectively.
www.maximintegrated.com
Evaluates: MAX17558
Power Supply Tracking
The EV kit is set up for independent soft-start without
tracking. The EV kit outputs are also operated in tracking
mode, with either output as a master by the following
modifications.
For OUT2 to track OUT1, follow the steps below:
●● Replace R23 with a 0Ω resistor
●● Replace R22 and C30 with a resistive divider such
that the parallel combination of the divider resistors
is less than 10kΩ. The ratios of the resistor-dividers
should be identical to the ratios of R26, R27, R6, and
R7 for the coincident tracking and ratiometric tracking, respectively.
For OUT1 to track OUT2, follow the steps below:
●● Replace R30 with a 0Ω resistor
●● Replace R29 and C21 with a resistive-divider such
that the parallel combination of the divider resistors
is less than 10kΩ. The ratios of the divider resistors
should be identical to the ratios of R6, R7 and R26,
R27 for the coincident tracking and ratiometric tracking,
respectively.
Maxim Integrated │ 4
MAX17558 Evaluation Kit
Evaluates: MAX17558
EV Kit Performance Report
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 3.3V, PWM MODE
90
80
80
70
70
EFFICIENCY (%)
EFFICIENCY (%)
90
60
50
VIN = 12V
40
VIN = 24V
VIN = 36V
50
20
20
2000
4000
6000
8000
VIN = 36V
FSW = 350kHz
10
FSW = 350kHz
0
VIN = 24V
40
30
0
VIN = 12V
60
30
10
0
10000
1
OUTPUT (mA)
OUTPUT (mA)
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 5V, PWM MODE
100
toc03
90
85
VIN = 12V
VIN = 36V
VIN = 24V
80
70
70
60
50
40
VIN = 36V
30
VIN = 24V
20
75
FSW = 350kHz
0
1000
2000
3000
4000
FSW = 350kHz
10
0
5000
OUTPUT (mA)
STARTUP FROM ENABLE
VIN = 24V, VOUT1 = 5V, IOUT1 = 5A,
VOUT2 = 3.3V, IOUT2 = 10A
toc04
VIN = 12V
80
EFFICIENCY (%)
EFFICIENCY (%)
95
1000
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 5V, DCM MODE
100
90
toc02
100
toc01
100
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 3.3V, DCM MODE
1
10
100
1000
OUTPUT (mA)
STARTUP INTO PREBIASED OUTPUT
VIN = 24V, VOUT1 = 5V, IOUT1 = 0A,
VOUT2 = 3.3V, IOUT2 = 0A
toc06
toc05
VOUT1
1V/div
1V/div
VOUT2
1V/div
1V/div
IOUT2
5A/div
IOUT1
5A/div
VOUT1
VOUT2
5V/div
EN
1ms/div
www.maximintegrated.com
1ms/div
Maxim Integrated │ 5
MAX17558 Evaluation Kit
Evaluates: MAX17558
EV Kit Performance Report (continued)
50
40
1V/div
VOUT1
PHASE
30
GAIN (dB)
1V/div
VOUT2
CLOSED-LOOP BODE PLOT
VIN = 24V, VOUT = 5V, IOUT = 5A
150
120
90
20
60
10
30
0
IOUT2
5A/div
-10
IOUT1
5A/div
-20
0
GAIN
-30
-60
CROSSOVER FREQUENCY = 39 kHz
PHASE MARGIN = 64.9°
-30
-90
-120
-40
-50
1ms/div
toc8
PHASE MARGIN (°)
COINCIDENT TRACKING AT STARTUP
VIN = 24V, VOUT1 = 5V, IOUT1 = 5A,
VOUT2 = 3.3V, IOUT2 = 10A
toc7
1k
10k
100k
-150
FREQUENCY (Hz)
CLOSED-LOOP BODE PLOT
VIN = 24V, VOUT = 3.3V, IOUT = 10A
40
GAIN (dB)
150
120
PHASE
30
toc9
90
20
60
10
30
0
0
GAIN
-10
-20
-30
-60
CROSSOVER FREQUENCY = 39.8kHz
PHASE MARGIN = 69◦
-30
-90
-120
-40
-50
PHASE MARGIN (°)
50
1k
10k
100k
-150
FREQUENCY (Hz)
www.maximintegrated.com
Maxim Integrated │ 6
MAX17558 Evaluation Kit
Evaluates: MAX17558
Figure 1. MAX17558 EV Kit Component Placement Guide—
Component Top Side
Figure 2. MAX17558 EV Kit PCB Layout—
Component Top Side
Figure 3. MAX17558 EV Kit PCB Layout—Inner Layer 1
Figure 4. MAX17558 EV Kit PCB Layout—Inner Layer 2
www.maximintegrated.com
Maxim Integrated │ 7
MAX17558 Evaluation Kit
Figure 5. MAX17558 EV Kit Component Placement Guide—
Solder Bottom Side
Evaluates: MAX17558
Figure 6. MAX17558 EV Kit PCB Layout—
Component Bottom Side
Component Suppliers
SUPPLIER
WEBSITE
Wurth Elektronik
www.we-online.com
Renesas Electronics
am.renesas.com
Murata Americas
www.murata.com
Panasonic Electronic Components
www.panasonic.com/industrial
Vishay Dale
www.vishay.com
TDK Corp.
www.tdk.com
Rubycon Corp.
www.rubycon.com
TT Electronics/Welwyn
www.welwyn-tt.com
Note: Indicate that you are using the MAX17558 when contacting these component suppliers.
www.maximintegrated.com
Maxim Integrated │ 8
MAX17558 Evaluation Kit
Component List and Schematic
See the following links for component information and
schematics:
●● MAX17558 EV BOM
●● MAX17558 EV Schematic
www.maximintegrated.com
Evaluates: MAX17558
Ordering Information
PART
TYPE
MAX17558EVKIT#
EV kit
#Denotes RoHS compliant.
Maxim Integrated │ 9
MAX17558 Evaluation Kit
Evaluates: MAX17558
Revision History
REVISION
NUMBER
REVISION
DATE
0
5/15
DESCRIPTION
Initial release
PAGES
CHANGED
—
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. │ 10
8
7
6
5
TRACK1
PGOOD1
VOUT1
VOUT2
4
3
1
2
VCCINT
VCCINT
R30
0
2
GND
8
R18
R19
OPEN
OPEN
R28
12.1K
C28
1
+
5
1
2
3
1
2
2
0.009
+
1
Q4
C10
120UF
C11
120UF
C12
10UF
C13
10UF
PGND1
2
1
2
3
1
2
3
5V@5A
VOUT1
1
5
5
TP7
575-4
+
1
2
3
0
C
VOUT1
R1
1
TP9
575-4
Q8
1
4
G S
L2
2.2UH
C16
10UF
R2
2
C17
10UF
PGND2
PGND
VOUT2
0.005
TP10
575-4
3.3V@10A
VOUT2
CS2-
G S
D
D
Q5
Q7
B
2
C15
180UF
+
C14
180UF
1
2
3
5
C
VCCINT
+
D
Q6
4
2
G S
D
1
4
G S
1
4
GND
1
2
3
EP
33
L1
4.7UH
2
5
BST2
C
CS1-
G S
VIN
CS2+
1
2
10K
R22
C9
4.7UF
0
C8
4.7UF
C7
GND
C6
4.7UF
PGND
4.7UF
C30
0.015UF
PGND
GND
R23
OPEN
0.012UF
TRACK2
GND
7
CS1+
G S
D
4
1
2
3
DH2
17
DFLS1100-7
19
20
27
29
28
30
15
G S
5
C29
120PF
VOUT1
PGND
1UF
SS2
GND
GND
GND
CS2+
CS2-
3
Q3
PGND
C32
R20
32.4K
TP5
575-4
TP8
575-4
0
JU5
1
Q2
D
R9
R27
4.7UF
2
4
R26
GND
2
16
R12
0.47UF
0
OPEN
C2
4.7UF
C31
100K
EN2
VIN
R25
R17
OPEN
A
LX2
R10
VCCINT
GND
3
R16
R11
0
D2
JU4
1
DL2
18
PGOOD2
C33
OPEN
0
VIN
21
4
G S
5
R24
PGND
4
D
1
2
3
EN1
23
Q1
D
A
R15
100K
PREC003SAAN-RC
DL1
SS2
C27
1000PF
GND
LX1
25
14
1000PF
26
13
EN2
DH1
COMP2
8
24
12
EN1
C26
1000PF
GND
1
2
3
7
BST1
FB2
JU3
GND
U1
IN
22
11
VCCINT
SKIP
6
MAX17558
VOUT2
B
C25
5
VCCINT
TEST
VCCEXT
4
PGOOD1
SEL_PH
SS1
RT
3
53.6K
ILIM
2
COMP1
31
CS1-
GND
GND
FB1
1
R14
C3
4.7UF
D1
R3
1UF
CS2+
GND
CS1+
CS2-
1000PF
CS1-
32
10
0 C24
PGND
C18
9
R13
CS1+
GND
VCCINT
10UF
0
GND
PREC002SAAN-RC
PGND
C20
OPEN
C4
PGND3
68PF
C34
VCCINT
1
2
C23
A
R8
18.7K
JU1
GND
6V TO 60V
C1
150UF
5
0.012UF
R7
TP6
575-4
C19
1UF
R21
GND
C5
4.7UF
10K
C22
13.3K
95.3K
C
R4
2.2
0.015UF
D
VIN
VIN
GND
SS1
C21
R6
VCCINT
0
0
VIN
VOUT1
1
2
3
R29
R5
VCCINT
JU2
PREC003SAAN-RC
OPEN
D
6
PGOOD2
5
PROJECT TITLE:
MAX17558 EVALUATION KIT SCHEMATIC
4
3
2
1
A
BILL OF MATERIALS (BOM)
DESIGNATION
QTY
DESCRIPTION
C1
1
150uF, 80V , Aluminum-Electrolytic Capacitor
PANASONIC EEVFK1K151Q
C2-C9
8
4.7uF ±20%, 80V X7R Ceramic Capacitor
Murata GRM32ER71K475ME14#
C10, C11
2
120uF, 6.3V , Electrolytic Capacitor
PANASONIC EEFSX0J121E7
C12,C13,C16,C17
4
10uF ±10%, 10V X7R Ceramic Capacitor(1210)
Murata GRM32DR71A106KA01L
C14, C15
2
180uF, 6.3V , Electrolytic Capacitor
RUBYCON 6SW180M
C18
1
1uF ±10%, 100V X7S Ceramic Capacitor(0805)
TDK Corporation C2012X7S2A105K
C19,C32
1
1uF ±10%, 16V X7R Ceramic Capacitor(0603)
Murata GRM188R71A105KA61J
C20
1
10uF ±10%, 10V X7R Ceramic Capacitor(0805)
Murata GRM21BR71A106KE51L
C21,C30
2
15nF ±10%, 16V X7R Ceramic Capacitor(0603)
Murata GRM188R71C153KA01D
C22,C28
2
12nF ±10%, 16V X7R Ceramic Capacitor(0603)
Murata GRM188R71C123KA01D
C23
1
68pF ±5%, 50V C0G Ceramic Capacitor(0603)
Murata GRM1885C1H680J
C24,C25,C26,C27
4
1nF ±10%, 16V X7R Ceramic Capacitor(0603)
Murata GRM188R71C102KA01D
C29
1
120pF ±5%, 50V C0G Ceramic Capacitor(0603)
Murata GRM1885C1H121JA01D
C31
1
0.47uF ±10%, 16V X7R Ceramic Capacitor(0603)
Murata GRM188R71A474KA61D
C33,C34
0
Not Installed.
BILL OF MATERIALS (BOM)
Ceramic Capacitor (0603)
JU1
1
2-pin header ( 0.1” pitch)
JU2,JU3, JU4,JU5
4
3-pin header ( 0.1” pitch)
L1
1
4.7μH, 9.4A Inductor
Coilcraft SER1360-472KL
L2
1
2.2μH, 11.5A Inductor
Wurth Electronics 7447709002
Q1,Q5,Q7
3
60V, 25A N-Channel MOSFET (LFPAK)
Renesas RJK0651DPB
Q2,Q8
2
60V, 45A MOSFET (LFPAK)
Renesas RJK0653DPB
Q3
0
Not installed, N-Channel MOSFET (LFPAK)
Renasas RJK0651DPB
Q4,Q6
0
Not installed (LFPAK)
Renasas RJK0653DPB
D1,D2
2
100V Schottky Diode (POWERDI 123)
Diodes Incorporated DFLS 1100-7
R1
1
9mΩ ±1% 1Watt current sense resistor (2010)
ROHM Semiconductor PMR50HZPFU9L00
R2
1
5mΩ ±1% 1.5Watt current sense resistor (2010)
TT Electronics/Welwyn
R3,R5,R9,R10,R11,R12,R13, R22,R24,
R25,R29
11
0Ω ±1% resistor (0603
R4
1
2.2Ω ±1% resistor (0603)
R6
1
95.3KΩ ±1% resistor (0603)
R7
1
18.7KΩ ±1% resistor (0603
R8
1
13.3KΩ ±1% resistor (0603)
R14
1
53.6KΩ ±1% resistor (0603)
R15,R26
2
100KΩ ±1% resistor (0603)
R20, R21
2
10KΩ ±1% resistor (0603)
LRMAT2010-R005FT4
BILL OF MATERIALS (BOM)
R16, R17, R18, R19, R23, R30
0
Not installed, resistor (0603)
R27
1
32.4KΩ ±1% resistor (0603
R28
1
12.1KΩ ±1% resistor (0603)
U1
1
Wide 4.5V to 60V Input, Dual Output, Step-Down DC-DC
Controller (32 TQFN-EP)
Maxim MAX17558ATJ+
VIN,PGND,VOUT1,PGND,VOUT2,PGN
D,EN1,EN2,GND,PGOOD1,PGOOD2,
VCCINT,TRACK1,TRACK2
14
20G tinned copper Bus wire formed into “U” shaped loops (0.25”
off the PC board)
VIN,PGND,VOUT1,PGND,VOUT2,PGN
D
6
Non -Insulate Jack
Keystone Electronics 575-4
工商网监
湘ICP备2023018690号
