MAXM17502ALIT [MAXIM]
1A, 60V High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor;
| 型号： | MAXM17502ALIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 1A, 60V High-Efficiency, DC-DC Step-Down Power Module with Integrated Inductor |
| 文件： | 总15页 (文件大小：564K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
General Description
Benefits and Features
● Reduces Design Complexity, Manufacturing Risks,
The Himalaya series of voltage regulator ICs and power
modules enable cooler, smaller, and simpler power supply
solutions. The MAXM17502 is a high-voltage, step-down
power module in a family of pin-to-pin compatible modules
with built-in thermally efficient system-in-packages (SiPs).
Thedeviceincludesaswitchmodepowersupplycontroller,
MOSFETs, an inductor, as well as the compensation
components. The device operates from a 4.5V to 60V
input supply voltage and supports adjustable output
voltage from 0.9V to 5.0V with an output current of 1A.
The high level of integration significantly reduces design
complexity, manufacturing risks, and offers a true plug-
and-play power supply solution to reduce time to market.
and Time to Market
• Integrated Switching Power Supply Controller and
Dual-MOSFET Power Switches
• Integrated Inductor
• Integrated Compensation Components
• Integrated Thermal-Fault Protection
• Integrated Peak Current Limit
● Saves Board Space in Space-Constrained
Applications
• Complete Integrated Step-Down Power Supply in a
Single Package
• Small Profile 6.5mm x 10mm x 2.8mm SiP Pack-
age
The pin-to-pin compatibility within this family of modules
allows design flexibility as the design requirements
change. For sequencing purpose, the device features
adjustable soft-start time, programmable EN/UVLO
threshold, and a power-good indicator (RESET pin).
• Simplified PCB Design with Minimal External BOM
Components
● Offers Flexibility for Power-Design Optimization
• Wide Input Voltage Range from 4.5V to 60V
• Output Voltage Adjustable Range from 0.9V to
5.0V
The MAXM17502 is available in a thermally enhanced,
compact, 28-pin, 6.5mm x 10mm x 2.8mm SiP package. It
operates over the -40°C to +125°C industrial temperature
range.
• Delivers up to 1A Current
• Shutdown Current as Low as 0.9μA (typ)
• ±1.8% System Accuracy
• Fixed-Frequency PWM
Applications
● Industrial Sensors and Process Control
● High-Voltage LDO Replacement
● Battery-Powered Equipment
● HVAC and Building Control
● General-Purpose Point-of-Load
• Programmable Soft-Start and Prebias Startup
• Optional Programmable EN/UVLO
• Robust Operation
• Open-Drain Power Good Output (RESET pin)
• -40°C to +125°C Industrial/Automotive
Temperature Range
Ordering Information appears at end of data sheet.
19-8758; Rev 2; 5/19
MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Absolute Maximum Ratings
V
to PGND .........................................................-0.3V to +70V
GND to PGND......................................................-0.3V to +0.3V
Operating Temperature Range......................... -40°C to +125°C
Junction Temperature......................................................+125°C
Storage Temperature Range............................ -65°C to +125°C
Lead Temperature (soldering, 10s) .................................+245°C
IN
EN to GND .................................................-0.3V to (V + 0.3V)
IN
FB, RESET, COMP, SS to GND .............................-0.3V to +6V
V
to GND ..............................................................-0.3V to 6V
CC
OUT to PGND (V < 10V).........................-0.3V to (V + 0.3V)
IN
IN
OUT to PGND (V > 10V)....................................-0.3V to +10V
IN
LX to PGND................................................-0.3V to (V + 0.3V)
IN
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only; functional operation of the device at these or
any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
PACKAGE TYPE: 28 SiP
Package Code
L286510+2
21-1073
Outline Number
Land Pattern Number
THERMAL RESISTANCE (Note 1)
90-100009
Junction to Ambient (θ
)
30°C/W
JA
Note 1: Package Thermal Resistance data taken using MAXM17502EVKIT# evaluation kit.
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Electrical Characteristics
(V = +24V, V
= V
= 0V, C = 2.2µF, V
= 1.5V, C
= 22µF, V
= V
, SS = COMP = RESET = unconnected.
IN
GND
PGND
IN
EN
OUT
FB
OUT
T
= T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced to GND, unless
A
J
A
otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
INPUT SUPPLY (V N)
I
IN Voltage Range
IN Supply Current
ENABLE (EN)
V
4.5
60
V
IN
I
V
= 0V, shutdown mode
0.9
5
3.5
µA
IN-SH
EN
Normal switching mode, no load,
I
mA
IN-SW
V
FB
= 0V
V
V
V
rising
falling
1.18
1.218
1.135
1.25
ENR
EN
V
1.105
1.165
ENF
EN
EN Threshold
V
V
EN-
TRUESD
V
V
falling, true shutdown
0.7
8
EN
EN Input Leakage Current
I
= V = 60V; T = +25°C
200
nA
V
EN
EN
IN
A
INTERNAL LDO (V
)
CC
6V < V < 12V, 0mA < I
< 10mA
IN
VCC
V
Output Voltage Range
V
4.65
5
5.35
80
CC
CC
12V < V < 60V, 0mA < I
< 2mA
IN
VCC
V
V
Current Limit
Dropout
I
V
V
V
V
= 4.3V, V = 12V
15
40
mA
V
CC
VCC-MAX
CC
IN
V
= 4.5V, I = 5mA
VCC
4.1
CC
CC-DO
IN
V
rising
falling
3.85
3.55
4
4.15
3.85
CC-UVR
CC
CC
V
UVLO
V
CC
V
3.7
CC-UVF
SOFT-START (SS)
Charging Current
I
t
V
= 0.5V
4.7
5
5.3
µA
ms
SS
SS
Soft-Start Time
1.8
SS
FEEDBACK (FB)
FB Regulation Voltage
FB Input Bias Current
OUTPUT VOLTAGE (V
V
0.884
0.9
0.916
100
V
FB_REG
I
T
= +25°C
nA
FB
A
)
OUT
V
= 4.5V to 60V, no load and PWM
IN
Line Regulation Accuracy
Load Regulation Accuracy
0.2
8
mV/V
mV/A
%
operation
0 < I < 1A; V
= 3.3V
OUT
OUT
V
Undervoltage Trip Level to
OUT
V
V
> 0.95V (soft-start is done)
68.5
71.14
32768
73.5
OUT-HICF
SS
Cause HICCUP
HICCUP Timeout
Cycles
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Electrical Characteristics (continued)
(V = +24V, V
= V
= 0V, C = 2.2µF, V
= 1.5V, C
= 22µF, V
= V
, SS = COMP = RESET = unconnected.
IN
GND
PGND
IN
EN
OUT
FB
OUT
T
= T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C. All voltages are referenced to GND, unless
A
J
A
otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
CURRENT LIMIT
Average Current-Limit Threshold
Valley Current-Limit Threshold
OSCILLATOR
I
1.5
AVG-LIMIT
A
I
VALLEY-
LIMIT
0.56
0.65
0.74
V
V
> V
< V
500
250
540
270
75
580
290
120
FB
OUT-HICF
Switching Frequency
f
kHz
ns
SW
FB
OUT-HICF
Minimum On-Time
t
ON_MIN
RESET (RESET)
RESET Output Level Low
I
= 1mA
0.04
0.45
V
RESET
RESET Output Leakage Current
High
V
V
V
= 1V
µA
FB
FB
FB
V
Threshold for RESET
OUT
V
falling
rising
90.5
93.5
92.5
95.5
1024
94.5
97.5
%
%
OUT-OKF
Assertion
V
Threshold for RESET
OUT
V
OUT-OKR
De-assertion
RESET Deassertion Delay after
FB Reaches 95% Regulation
Cycles
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
Temperature rising
165
10
°C
°C
Note 2: All limits are 100% tested at T = +25°C. Maximum and minimum limits are guaranteed by design and characterization
A
over temperature.
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Typical Operating Characteristics
(V = 4.5V to 60V, V
= 0.9 to 5.0V, I
= 0A to 1A, T = +25°C, unless otherwise noted.)
IN
OUT
OUT
A
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 0.9V
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 1.2V
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 2.5V
toc03
toc01
toc02
90
85
80
75
70
65
60
55
50
45
40
100
90
80
70
60
50
40
100
90
80
70
60
50
40
VIN = 5V
VIN = 36V
VIN = 48V
VIN = 12V
VIN = 24V
VIN = 12V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 24V
600
VIN = 5V
200
VIN = 36V
800
0
200
400
600
800
1000
0
400
1000
0
200
400
600
800
1000
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 3.3V
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 5V
toc04
toc05
100
90
80
70
60
50
40
100
90
80
70
60
50
40
VIN = 24V
VIN = 48V
VIN = 36V
VIN = 36V
VIN = 48V
VIN = 12V
VIN = 12V
VIN = 24V
0
200
400
600
800
1000
0
200
400
600
800
1000
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
LOAD REGULATION
VOUT = 5V
LOAD REGULATION
VOUT = 3.3V
toc07
toc06
5.5
5.4
5.3
5.2
5.1
5
3.6
3.5
3.4
3.3
3.2
3.1
3.0
VIN = 12V
VIN = 12V
VIN = 36V
VIN = 36V
4.9
4.8
4.7
4.6
4.5
VIN = 48V
VIN = 48V
VIN = 24V
VIN = 24V
0
200
400
600
800
1000
0
200
400
600
800
1000
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(V = 4.5V to 60V, V
= 0.9 to 5.0V, I = 0A to 1A, T = +25°C, unless otherwise noted.)
OUT A
IN
OUT
INPUT VOLTAGERIPPLE
OUTPUT VOLTAGERIPPLE
OUTPUT VOLTAGERIPPLE
V = 24V, VOUT = 3.3V, IOUT = 1A
IN
V = 24V, VOUT = 5V, IOUT = 1A
IN
V = 24V, VOUT = 3.3V, IOUT = 1A
IN
toc08
200mV/div
(AC-
COUPLED)
10mV/div
(AC-
COUPLED)
10mV/div
VIN
VOUT
VOUT
(AC-
COUPLED)
1µs/div
1µs/div
1µs/div
INPUT VOLTAGERIPPLE
LOAD CURRENT TRANSIENT RESPONSE
V = 24V, VOUT = 5V, IOUT = 1A
IN
V = 24V, VOUT = 3.3V, IOUT = 0.05A–0.5A
IN
100mV/div
(AC
VOUT
COUPLED)
200mV/div
(AC-
VIN
COUPLED)
500mA/div
IOUT
2µs/div
100µs/div
STARTUPAND SHUTDOWN
THROUGH ENABLE
V = 24V, VOUT = 3.3V, IOUT = 1A
IN
5V/div
2V/div
EN
VOUT
500mA/div
5V/div
IOUT
RESET
1ms/div
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(V = 4.5V to 60V, V
= 0.9 to 5.0V, I = 0A to 1A, T = +25°C, unless otherwise noted.)
OUT A
IN
OUT
STARTUPAND SHUTDOWNTHROUGH ENABLE
STARTUPAND SHUTDOWN
THROUGH INPUT SUPPLY
STARTUPAND SHUTDOWNTHROUGH
INPUT SUPPLY
V = 24V, VOUT = 5V, IOUT = 1A
IN
V = 24V, VOUT = 5V, IOUT = 1A
IN
V = 24V, VOUT = 3.3V, IOUT = 1A
IN
toc16
20V/div
2V/div
5V/div
VIN
20V/div
5V/div
VIN
EN
5V/div
VOUT
VOUT
VOUT
500mA/div
5V/div
500mA/div
5V/div
500mA/div
5V/div
IOUT
IOUT
IOUT
RESET
RESET
RESET
1ms/div
1ms/div
1ms/div
OUTPUT SHORT IN STEADY STATE
OUTPUT SHORT DURING STARTUP
V = 24V, VOUT = 3.3V, IOUT = 0A to SHORT
IN
V = 24V, VOUT = 3.3V, IOUT = SHORT
IN
20V/div
20V/div
VIN
VOUT
IOUT
VIN
200mV/div
1A/div
200mV/div
1A/div
VOUT
IOUT
20ms/div
20ms/div
OUTPUT CURRENT
vs. AMBIENT TEMPERATURE
IN = 24V NOAIR FLOW
CLOSED-LOOPBODE PLOT
V = 24V, VOUT = 3.3V, IOUT = 1A
IN
V
toc20
toc21
50
150
120
90
1.2
1.0
0.8
0.6
0.4
0.2
0.0
40
30
PHASE
20
60
VOUT = 5V
10
30
0
0
VOUT = 3.3V
GAIN
-10
-20
-30
-40
-50
-30
-60
-90
-120
-150
VOUT = 1.2V
CROSSOVER FREQUENCY= 34kHz
PHASE MARGIN = 66.3°
1k
10k
100k
1Meg
0
10 20 30 40 50 60 70 80 90 100 110 120
AMBIENT TEMPERATURE (°C)
FREQUENCY (Hz)
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Pin Configuration
TOP VIEW
23
19
28 27 26 25 24
22 21 20
FB
N.C.
1
2
3
4
18 OUT
17 OUT
16 OUT
15 OUT
EP1
EP2
EP3
SS
COMP
MAXM17502
10
14
5
6
7
8
9
11 12 13
28 SiP
*PINS ARE DEFINED AS NO CONNECTION (N.C.) IF A FEATURE IS ABSENT.
Pin Description
PIN
NAME
FUNCTION
1
FB
Feedback Input. Connect FB to the center of the resistive divider between OUT and GND.
No Connection. Leave this pin unconnected.
2, 5, 6, 27
N.C.
Soft-Start Input. Default soft-start time is 1.8ms with internal soft-start capacitance of 10nF. Connect
additional capacitor from SS to GND to increase the soft-start time.
3
4
SS
COMP
Leave Unconnected.
Open-Drain RESET Output. It is driven low if FB drops below 92.5% of its set value. RESET goes
high 1024 clock cycles after FB rises above 95.5% of its set value. RESET is valid when the device
7
RESET
is enabled and V is above 4.5V.
IN
8
GND
Analog Ground. Connect to PGND at a single point.
9, 10, 22, 23
PGND
Power Ground. Connect PGND externally to the power ground plane.
Regulator Output Pin. Connect a capacitor from OUT to PGND. See PCB Layout Guidelines
section for more connection details.
11–21
24, 25
OUT
V
Power-Supply Input. The input supply range is from 4.5V to 60V.
IN
Enable/Undervoltage Lockout Input. Drive EN high to enable the output voltage. Connect to
26
EN
the center of the resistive divider between V and GND to set the input voltage (undervoltage
IN
threshold) at which the device turns on. Pull up to V for always on.
IN
28
V
5V LDO Output
CC
EP1
GND
Exposed Pad 1. Connect this pad to the GND plane and copper area of 1in x 1in for cooling.
Exposed Pad 2. Connect this pad to the PCB for better thermal performance, but do not connect to
any other node. Minimize area of copper island
EP2
EP3
LX
OUT
Exposed Pad 3. Connect this pad to the OUT pins and copper area of 1in x 1in.
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Functional Diagram
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Design Procedure
Setting the Output Voltage
VOUT
OUT
The MAXM17502 supports an adjustable output voltage
range of 0.9V to 5.0V by using a resistive feedback divider
from OUT to FB. The adjustable output voltages can be
calculated by following the procedure to choose the resistive
voltage-divider values:
R1
MAXM17502
FB
Select the parallel combination of R1 and R2, R to be
P
R2
less than 15kΩ. Once R is selected, calculate R1 as:
P
R
× V
OUT
P
R1=
0.9
Figure 1: Adjusting Output Voltage
Calculate resistor R2 FB to GND as follows:
R1× 0.9
R2 =
Input Capacitor Selection
V
− 0.9
(
)
OUT
The input capacitor serves to reduce the current peaks
drawn from the input power supply and reducing switching
noise to the IC. The input capacitor values in Table 1 are the
minimum recommended values for desired input and
output voltages. Applying capacitor values larger than
those indicated in Table 1 are acceptable. For further
operating conditions, the total input capacitance must be
equal to or greater than the value given by the following
equation to keep the input-voltage ripple within specifica-
tions and minimize the high-frequency ripple current
being fed back to the input source:
where R2 is in kΩ.
Input Voltage Range
The maximum operating input voltage is determined by the
minimum controllable on-time and the minimum operating
input voltage is determined by the maximum duty cycle
and circuit voltage drops. The minimum and maximum
operating input voltages for a given output voltage should
be calculated as:
V
+ I
(
×1.013
OUT(MAX)
)
I
(
×(1− D)
OUT
)
IN_AVG
V
=
CIN
=
IN(MIN)
D
∆V × f
MAX
IN
SW
where:
+ I
(
× 0.73
)
OUT(MAX)
I
is the average input current given by:
POUT
IN_AVG
V
OUT
V
IN(MAX )
=
IIN_AVG
=
f
x t
ON(MIN)
SW (MAX)
η× VIN
where V
is the maximum load current, f
frequency (maximum), and t
minimum switch on-time.
is the steady-state output voltage, I
OUT(MAX)
D is the operating duty cycle, which is approximately
OUT
is the switching
equal to V /V
SW(MAX)
OUT IN
is the worst-case
ON(MIN)
ΔV is the required input voltage ripple
IN
f
is the operating switching frequency
SW
P
is the output power, which is equal to V
x I
OUT OUT
OUT
η is the efficiency
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
The input capacitor must meet the ripple current requirement
imposed by the switching currents. The RMS input ripple
current is given by:
Soft-Start Capacitor Selection
The device provides a default 1.8ms soft-start time to
reduce inrush current during start-up. The soft-start time
can be increased by connecting an external capacitor
IRMS = IOUT × D ×(1− D)
(C ) from the SS pin to GND. The value of the additional
soft-start capacitor is calculated from the desired soft-start
time as follows:
SS
The worst-case RMS current requirement occurs when
operating with D = 0.5. At this point, the above equation
simplifies to I
= 0.5 x I
.
RMS
OUT
C
= 5.55× t
(
−10
SS
)
SS
For the MAXM17502 system (IN) supply, ceramic capacitors
are preferred due to their resilience to inrush surge currents
typical of systems and their low parasitic inductance These
attributes help reduce the high-frequency ringing on the IN
supply when the internal MOSFETs are turned off. Choose
an input capacitor that exhibits less than +10°C temperature
rise at the RMS input current for optimal circuit longevity.
where t is in ms and C is in nF.
SS
SS
Detailed Description
The MAXM17502 is a complete step-down DC-DC power
supply to deliver up to 1000mA output current. The device
contains switch mode power supply controller, dual
n-channel MOSFET power switches and a fully shielded
inductor as well as internal compensation. The device
provides a programmable output voltage to regulate up to
5V through external resistor dividers from an input voltage
range of 4.5V to 60V. The device uses a 540kHz switching
frequency to reduce sizes of input and output capacitors.
The Functional Diagram illustrates the complete internal
block diagram of the MAXM17502 power module.
Output Capacitor Selection
The X7R ceramic output capacitors are preferred due to
their stability over temperature in industrial applications. The
output capacitor is usually sized to support a step load of
50% of the maximum output current in the application, so the
output voltage deviation is contained to ±3% of the output
voltage change. For adjustable output voltages, the output
capacitance value is given by the following equation:
Input Undervoltage-Lockout Level
ISTEP × t
1
2
RESPONSE
COUT
=
×
The device offers an adjustable input undervoltage-lockout
level to set the voltage at which the device turns on by a
resistive divider R3 and R4 connecting from IN to GND.
With R3 selected as 3.3MΩ, R4 can be calculated as:
∆VOUT
0.33
1
t
≅
+
RESPONSE
f
f
SW
C
where I
is the load current step, t
RESPONSE
STEP
3.3×1218
R4 ≈
is the response time of the controller, ΔV
allowable output voltage deviation during load transient,
is the
OUT
(VINU −1.218)
f
is the target closed-loop crossover frequency, and f
where R4 is in kΩ and V
device is required to turn on the device. Ensure that V
is the voltage at which the
C
SW
INU
is the switching frequency. Select f to be 1/12th of f
.
C
SW
INU
Consider DC bias and aging effects while selecting the
output capacitor.
is high enough to support the V
.
OUT
Table 1. Component Selection Table
V
(V)
V
(V)
C
C
R
(kΩ)
R (kΩ)
B
IN
OUT
IN
OUT
U
1 x 2.2µF 1206 100V
1 x 2.2µF 1206 100V
1 x 2.2µF 1206 100V
1 x 2.2µF 1206 100V
1 x 2.2µF 1206 100V
1 x 2.2µF 1206 100V
1 x 2.2µF 1206 100V
1 x 2.2µF 1206 100V
2 x 47µF 1210 6.3V
2 x 47µF 1210 6.3V
3 x 22µF 1206 6.3V
3 x 22µF 1206 6.3V
3 x 22µF 1206 6.3V
1 x 47µF 1210 6.3V
1 x 22µF 1206 6.3V
1 x 22µF 1206 6.3V
Open
130
13
4.5 to 13
4.5 to 15
4.5 to 18
4.5 to 23
4.5 to 27
6 to 38
0.9
14.3
17.4
21.5
26.1
36.5
47.5
75
1
52.3
32.4
26.1
20.5
17.8
16.5
1.2
1.5
1.8
2.5
3.3
5
8 to 50
12 to 60
Maxim Integrated
│ 11
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
RESET Output
PCB Layout Guidelines
The device includes a RESET comparator to monitor
the output for undervoltage and overvoltage conditions.
The open-drain RESET output requires an external
For a sample layout, refer to the MAXM17502 evaluation
kit layouts available at www.maximintegrated.com. Use
the following guidelines for good PCB layout:
pull up resistor from 10kΩ to 100kΩ to V
pin or a
CC
● All connections carrying pulsed currents must be very
short and as wide as possible. The loop area of these
connections must be made very small to reduce stray
inductance and radiated EMI.
voltage source not to exceed absolute maximum rating of
6V. RESET goes high impedance after the regulator output
increases above 95.5% of the designed nominal regulated
voltage. RESET goes low when the regulator output voltage
drops below 92.5% of the nominal regulated voltage. RESET
also goes low during thermal shutdown.
● Keep the input capacitors as close as possible to the
IN and PGND pins.
● Keep the output capacitors as close as possible to the
Thermal Fault Protection
OUT and PGND pins.
The device features a thermal-fault protection circuit.
When the junction temperature rises above +165°C (typ),
a thermal sensor activates the fault latch, pulls down the
RESET output, and shuts down the regulator. The thermal
sensor restarts the controllers after the junction temperature
cools by 10°C (typ). The soft-start resets during thermal
shutdown.
● Keep the resistive feedback dividers as close as pos-
sible to the FB pin.
● Connect all of the PGND connections to as large as
copper plane area as possible on the top layer.
● Connect EP1 to PGND and GND planes on top layer.
● Use multiple vias to connect internal PGND planes to
the top layer PGND plane.
Power Dissipation
The MAXM17502 output current needs to be derated
if the module needs to be operated in high ambient
temperature. The derating curves given in the Typical
Operating Characteristics can be used as a guide.
● Do not keep any solder mask on EP1, EP2, and EP3
on bottom layer. Keeping a solder mask on exposed
pads decreases the heat dissipating capability.
● Keep the power traces and load connections short.
The maximum allowable power losses can be calculated
using the following equation:
This practice is essential for high efficiency.
● Using thick copper PCBs (2oz vs. 1oz) can enhance
full load efficiency. Correctly routing PCB traces is a dif-
ficult task that must be approached in terms of fractions
of centimeters, where a single mΩ of excess trace
resistance causes a measurable efficiency penalty.
TJMAX − T
A
P
=
DMAX
θJA
where:
P
DMAX
is the maximum allowed power losses with maximum
allowed Junction temperature
T
is the maximum allowed junction temperature
JMAX
(+125°C)
T is operating ambient temperature
A
θ
is the junction to ambient thermal resistance
JA
Maxim Integrated
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Layout Recommendation
TOP VIEW
BOTTOM VIEW
PGND
V
V
IN
OUT
19
PGND
23
28 27 26 25 24
22 21 20
18
17
16
15
1
2
3
4
EP1
EP3
EP2
GND
10
13
5
6
7
8
9
11 12
14
Maxim Integrated
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Typical Application Circuit
4.5V TO 60V
IN
VOUT
OUT
C1
C2
R3
R1
EN
FB
R4
R2
VCC
MAXM17502
VCC
OPTIONAL
RESET
SS
COMP
EP1
SGND PGND
PGND
Ordering Information
PART
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
28 SiP
MAXM17502ALI#
MAXM17502ALI#T
28 SiP
#Denotes a RoHS-compliant device that may include lead(Pb)
that is exempt under the RoHS requirements.
T = Tape and reel.
Chip Information
PROCESS: BiCMOS
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│ 14
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MAXM17502
1A, 60V High-Efficiency, DC-DC Step-Down
Power Module with Integrated Inductor
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
5/17
Initial release
—
Updated Absolute Maximum Ratings section, Table 1, and Layout Recommendation
diagram
1
2
11/17
5/19
2, 11, 13
14
Updated the part number to MAXM17502ALI# and MAXM17502ALI#T in the Ordering
Information table
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. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2019 Maxim Integrated Products, Inc.
│ 15
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