MAXM17536ALY [MAXIM]
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down SiP Power Module with Integrated Inductor;
| 型号： | MAXM17536ALY |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down SiP Power Module with Integrated Inductor |
| 文件： | 总22页 (文件大小：1059K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVALUATION KIT AVAILABLE
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP 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 enables cooler, smaller, and simpler power supply
solutions. The MAXM17536 is an easy-to-use, step-down
power module that combines a switching power supply
controller, dual n-channel MOSFET power switches, fully
shielded inductor, and the compensation components in
a low-profile, thermally-efficient system-in-package (SiP).
The device operates over a wide input-voltage range
of 4.5V to 60V and delivers up to 4A continuous output
current with excellent line and load regulation over an
output-voltage range of 0.9V to 12V. The high level of
integration significantly reduces design complexity,
manufacturing risks, and offers a true plug-and-play power
supply solution, reducing time-to-market.
and Time-to-Market
• Integrated Synchronous Step-Down DC-DC
Converter
• Integrated Inductor
• Integrated FETs
• Integrated Compensation Components
● Saves Board Space in Space-Constrained
Applications
• Complete Integrated Step-Down Power Supply
in a Single Package
• Small Profile, 9mm x 15mm x 4.32mm SiP Package
• Simplified PCB Design with Minimal External BOM
The device can be operated in the pulse-width modulation
(PWM), pulse-frequency modulation (PFM), or discontinuous
conduction mode (DCM) control schemes.
Components
● Offers Flexibility for Power-Design Optimization
• Wide Input-Voltage Range from 4.5V to 60V
• Output-Voltage Adjustable Range from 0.9V to 12V
The MAXM17536 is available in a low-profile, highly
thermal-emissive, compact, 29-pin, 9mm x 15mm x
4.32mm SiP package that reduces power dissipation in
the package and enhances efficiency. The package is
easily soldered onto a printed circuit board and suitable
for automated circuit board assembly.
• Adjustable Frequency with External Frequency
Synchronization (100kHz to 2.2MHz)
• PWM, PFM, or DCM Current-Mode Control
• Programmable Soft-Start
• Auxiliary Bootstrap LDO for Improved Efficiency
• Optional Programmable EN/UVLO
Applications
● Test and Measurement Equipment
● Distributed Supply Regulation
● FPGA and DSP Point-of-Load Regulator
● Base-Station Point-of-Load Regulator
● HVAC and Building Control Systems
● Operates Reliably in Adverse Environments
• Integrated Thermal Protection
• Hiccup Mode Overload Protection
• RESET Output-Voltage Monitoring
• Ambient Operating Temperature Range
(-40°C to +125°C)/Junction Temperature Range
(-40°C to +150°C)
Typical Application Circuit
V
IN
7V TO 60V
• Complies with CISPR22(EN55022) Class B
Conducted and Radiated Emissions
C
IN
4 x 4.7µF
IN
5V, 4A
V
OUT
OUT
EN/UVLO
Ordering Information appears at end of data sheet.
C
R1
174kΩ
OUT
V
CC
R3
715kΩ
EXTVCC
FB
3 x 47µF
MAXM17536
DL
C
BST
LX
F
RESET
R2
38.3kΩ
2.2pF
CF
MODE/SYNC
SGND
C
SS
RT
PGND
22nF
: GRM31CZ72A475KE11L
: GRM32ER71A476KE15L
C
C
IN
OUT
19-100573; Rev 1; 8/19
MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Absolute Maximum Ratings
IN to PGND ...........................................................-0.3V to +65V
EN/UVLO, SS to SGND ........................................-0.3V to +65V
EXTVCC to PGND ................................................-0.3V to +26V
OUT to PGND (V ≤ 16V).........................-0.3V to (V + 0.3V)
IN
IN
LX to PGND................................................-0.3V to (V + 0.3V)
OUT to PGND (V > 16V)......................................-0.3V to 16V
IN
IN
BST to PGND........................................................-0.3V to +70V
BST to LX.............................................................-0.3V to +6.5V
Output Short-Circuit Duration....................................Continuous
Operating Temperature Range ........................ -40°C to +125°C
Junction Temperature (Note 1)........................................+150°C
Storage Temperature Range............................ -55°C to +150°C
Soldering Temperature (reflow).......................................+240°C
BST to V
...........................................................-0.3V to +65V
CC
FB, CF, RESET, MODE/SYNC, RT to SGND......-0.3V to +6.5V
DL, V to PGND ................................................-0.3V to +6.5V
CC
SGND to PGND....................................................-0.3V to +0.3V
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and 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: 29-PIN SiP
Package Code
L29915#1
21-100177
90-100055
Outline Number
Land Pattern Number
Thermal Resistance, Four-Layer Board: (Note 2)
Junction to Ambient (θ
)
24°C/W
JA
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.
Note 1: Junction temperature greater than +125°C degrades operating lifetimes.
Note 2: Package thermal resistance is measured on an evaluation board with natural convection.
Electrical Characteristics
(V = V
= 24V, R = OPEN (450kHz), V
= V
= V
= 0V, LX = SS = RESET = CF = DL = V
= OUT =
IN
EN/UVLO
RT
PGND
SGND
MODE/SYNC
CC
open, V
= 0V, V
to V = 5V, V = 1V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
EXTVCC
BST LX FB A A
All voltages are referenced to SGND, unless otherwise noted.) (Note 3)
PARAMETER
INPUT SUPPLY (V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
)
IN
Input-Voltage Range
V
4.5
60
16
V
IN
Input-Shutdown Current
I
V
= 0V, (Shutdown mode)
11
128
1.27
19
μA
μA
IN_SH
EN/UVLO
I
MODE/SYNC = open
DCM Mode
Q_PFM
Input-Quiescent Current
I
2
Q_DCM
mA
I
PWM Mode, no load, V
= V
= 5V
Q_PWM
OUT
EXTVCC
ENABLE/UNDERVOLTAGE LOCKOUT (EN/UVLO)
V
V
V
rising
falling
1.185
1.06
3.15
1.215
1.09
3.32
1.245
1.12
3.45
ENR
EN/UVLO
EN/UVLO Threshold
V
V
ENF
ENP
EN/UVLO
Enable Pullup Resistor
R
Pullup resistor between IN and EN/UVLO pins
MΩ
Maxim Integrated
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Electrical Characteristics (continued)
(V = V
= 24V, R = OPEN (450kHz), V
= V
= V
= 0V, LX = SS = RESET = CF = DL = V
= OUT =
IN
EN/UVLO
RT
PGND
SGND
MODE/SYNC
CC
open, V
= 0V, V
to V = 5V, V = 1V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
EXTVCC
BST LX FB A A
All voltages are referenced to SGND, unless otherwise noted.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOW DROPOUT (INLDO)
6V < V < 60V, I = 1mA
VCC
4.75
4.75
50
5
5
5.25
5.25
150
0.4
V
Output Voltage
IN
CC
V
V
CC
Range
1mA < I
< 45mA
VCC
V
Current Limit
I
V
V
V
V
= 4.3V, V = 7V
90
mA
V
CC
VCC_MAX
CC
IN
IN to V
Dropout
V
= 4.5V, I
= 45mA
CC
CC_DO
IN
VCC
V
rising
falling
4.1
3.7
4.2
3.8
4.3
CC_UVR
CC
CC
V
UVLO
V
CC
V
3.9
CC_UVF
LOW DROPOUT (EXTVCC)
EXTVCC
Operating Voltage Range
4.84
24
V
V
Rising
Falling
4.56
4.33
4.7
4.84
4.6
EXTVCC Switchover
Voltage
4.45
EXTVCC to V
Dropout
V
V
V
= 5V, I = 45mA
EXTVCC
0.6
V
CC
EXTVCC_DO
EXTVCC
EXTVCC Current Limit
SOFT-START (SS)
I
= 4.3V, EXTVCC = 8V
45
85
5
140
mA
EXTVCC_MAX
CC
SS
Charging Current
I
V
= 0.5V
4.7
5.3
μA
SS
OUTPUT SPECIFICATIONS
Line Regulation Accuracy
V
= 7V to 60V, V
= 5V
0.16
1
mV/V
mV/A
IN
OUT
Load Regulation
Accuracy
Tested with I
= 0A to 4A at V
= 5V
CC
OUT
OUT
MODE/SYNC = SGND or MODE = V
MODE/SYNC = OPEN
0.8875
0.9
0.9135
0.936
+75
FB Regulation Voltage
FB Input Bias Current
V
V
FB_REG
0.8875 0.915
-75
I
0 < V < 1V
FB
nA
V
FB
FB Undervoltage Trip
Level to Cause Hiccup
V
0.55
0.58
0.61
FB_HICF
HICCUP Timeout
32768
Cycles
MODE/SYNC PIN
V
MODE/SYNC = V
(DCM mode)
V
- 0.6
CC
M_DCM
CC
MODE Threshold
V
MODE/SYNC = OPEN (PFM mode)
MODE/SYNC = GND (PWM mode)
V
/2
CC
V
M_PFM
V
0.6
1.4 x f
M_PWM
SYNC Frequency-
Capture Range
f
set by R
1.1 x f
kHz
ns
SW
RT
SW
SW
SYNC Pulse Width
50
V
2.0
IH
SYNC Threshold
V
V
0.8
IL
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Electrical Characteristics (continued)
(V = V
= 24V, R = OPEN (450kHz), V
= V
= V
= 0V, LX = SS = RESET = CF = DL = V
= OUT =
IN
EN/UVLO
RT
PGND
SGND
MODE/SYNC
CC
open, V
= 0V, V
to V = 5V, V = 1V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
EXTVCC
BST LX FB A A
All voltages are referenced to SGND, unless otherwise noted.) (Note 3)
PARAMETER
RT PIN
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Switching Frequency
Accuracy
f
= 100kHz to 2.2MHz
-12
420
100
+12
480
%
SW
Switching Frequency
f
R
= open
450
114
kHz
kHz
ns
SW
RT
Switching Frequency
Adjustable Range
2200
160
Minimum On-Time
t
ON(MIN)
RESET PIN
RESET Sink Current
RESET Output-Level Low
10
mA
mV
I
RESET
400
I
= 10mA
= 5.5V
RESET
RESET Output-Leakage
Current
-100
90.4
93.4
+100
94.6
97.7
nA
%
V
RESET
V
Threshold for
OUT
V
V
falling
92.5
95.5
OUT_OKF
FB
FB
RESET Assertion
V
Threshold for
OUT
V
V
rising
%
OUT_OKR
RESET Deassertion
RESET Deassertion
Delay After FB Reaches
95% Regulation
1024
Cycles
THERMAL SHUTDOWN
Thermal Shutdown
Threshold
Temperature Rising
165
10
°C
°C
Thermal Shutdown
Hysteresis
Note 3: Electrical specifications are production tested at T = + 25°C. Specifications over the entire operating temperature range
A
are guaranteed by design and characterization.
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Typical Operating Characteristics
(V = V
= 24V, V
= V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN
EN/UVLO
SGND
PGND A A
All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1,
unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(3.3V OUTPUT, PWM MODE, fSW = 300kHz)
EFFICIENCY vs. LOAD CURRENT
(3.3V OUTPUT, PFM MODE, fSW = 300kHz)
EFFICIENCY vs. LOAD CURRENT
(5V OUTPUT, PWM MODE, fSW = 450kHz)
toc01
toc03
toc02
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 60V
VIN = 48V
VIN = 60V
VIN = 48V
VIN = 60V
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 5V
VIN = 36V
VIN = 24V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 5V
VIN = 12V
VIN = 7.5V
0
1000
2000
3000
4000
1
10
100
1000
0
1000
2000
3000
4000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(5V OUTPUT, DCM MODE, fSW = 450kHz)
EFFICIENCY vs. LOAD CURRENT
(5V OUTPUT, PFM MODE, fSW = 450kHz)
EFFICIENCY vs. LOAD CURRENT
(3.3V OUTPUT, DCM MODE, fSW = 300kHz)
toc04
toc05
toc06
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 24V
VIN = 24V
VIN = 12V
VIN = 7.5V
VIN = 12V
VIN = 5V
VIN = 60V
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 60V
VIN = 48V
VIN = 60V
VIN = 48V
VIN = 36V
VIN = 36V
VIN = 7.5V
1
10
100
1000
1
10
100
1000
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(1.2V OUTPUT, PWM MODE, fSW = 400kHz)
EFFICIENCY vs. LOAD CURRENT
(0.9V OUTPUT, PWM MODE, fSW = 300kHz)
EFFICIENCY vs. LOAD CURRENT
(1.5V OUTPUT, PWM MODE, fSW = 400kHz)
toc07
toc08
toc09
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 12V
VIN = 5V
VIN = 12V
VIN = 12V
VIN = 5V
VIN = 5V
0
1000
2000
3000
4000
0
1000
2000
3000
4000
0
1000
2000
3000
4000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(V = V
= 24V, V
= V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN
EN/UVLO
SGND
PGND A A
All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1,
unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
(1.8V OUTPUT, PWM MODE, fSW = 400kHz)
(2.5V OUTPUT, PWM MODE, fSW = 400kHz)
(8V OUTPUT, PWM MODE, fSW = 750kHz)
toc12
toc11
toc10
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 24V
VIN = 12V
VIN = 5V
VIN = 60V
VIN = 48V
VIN = 24V
VIN = 12V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 5V
0
1000
2000
3000
4000
0
1000
2000
3000
4000
0
1000
2000
3000
4000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(12V OUTPUT, PWM MODE, fSW = 900kHz)
EFFICIENCY vs. LOAD CURRENT
(1.2V OUTPUT, PFM MODE, fSW = 400kHz)
EFFICIENCY vs. LOAD CURRENT
(0.9V OUTPUT, PFM MODE, fSW = 300kHz)
toc15
toc13
toc14
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 60V
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 16V
VIN = 12V
VIN = 5V
VIN = 12V
VIN = 5V
1
10
100
1000
0
1000
2000
3000
4000
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
(2.5V OUTPUT, PFM MODE, fSW = 400kHz)
(1.5V OUTPUT, PFM MODE, fSW = 400kHz)
(1.8V OUTPUT, PFM MODE, fSW = 400kHz)
toc18
toc16
toc17
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 24V
VIN = 12V
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 12V
VIN = 5V
VIN = 5V
1
10
100
1000
1
10
100
1000
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(V = V
= 24V, V
= V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN
EN/UVLO
SGND
PGND A A
All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1,
unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
EFFICIENCY vs. LOAD CURRENT
(8V OUTPUT, PFM MODE, fSW = 750kHz)
(12V OUTPUT, PFM MODE, fSW = 900kHz)
toc19
toc20
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN = 60V
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 16V
VIN = 60V
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 12V
1
10
100
1000
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
STEADY-STATE SWITCHING WAVEFORMS
STEADY-STATE SWITCHING WAVEFORMS
(VIN = 24V, VOUT = 5V, IOUT = 4A, PWM MODE)
(VIN = 24V, VOUT = 5V, IOUT = 0A, PWM MODE)
toc22
toc21
20mV/div
VOUT (AC)
20mV/div
VOUT (AC)
10V/div
10V/div
VLX
VLX
2µs/div
2µs/div
STEADY-STATE SWITCHING WAVEFORMS
(VIN = 24V, VOUT = 5V, IOUT = 100mA, DCM MODE)
STEADY-STATE SWITCHING WAVEFORMS
(VIN = 24V, VOUT = 5V, IOUT = 25mA, PFM MODE)
toc23
toc24
100mV/div
VOUT (AC)
10mV/div
VOUT (AC)
10V/div
10V/div
VLX
VLX
100µs/div
1µs/div
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(V = V
= 24V, V
= V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN
EN/UVLO
SGND
PGND A A
All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1,
unless otherwise noted.)
OUTPUT VOLTAGE vs. LOAD CURRENT
(5V OUTPUT, PWM MODE, fSW = 450kHz)
OUTPUT VOLTAGE vs. LOAD CURRENT
(5V OUTPUT, PFM MODE, fSW = 450kHz)
toc25
toc26
5.000
4.995
4.990
4.985
4.980
4.975
4.970
5.150
5.130
5.110
5.090
5.070
5.050
5.030
5.010
4.990
4.970
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 7.5V
VIN = 12V
VIN = 7.5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
0
1000
2000
3000
4000
0
1000
2000
3000
4000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT VOLTAGE vs. LOAD CURRENT
(3.3V OUTPUT, PWM MODE, fSW = 300kHz)
OUTPUT VOLTAGE vs. LOAD CURRENT
(3.3V OUTPUT, PFM MODE, fSW = 300kHz)
toc27
toc28
3.317
3.316
3.315
3.314
3.313
3.312
3.311
3.310
3.309
3.42
3.40
3.38
3.36
3.34
3.32
3.30
VIN = 5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 48V
VIN = 60V
VIN = 60V
VIN = 48V
VIN = 36V
VIN = 24V
VIN = 12V
VIN = 5V
0
1000
2000
3000
4000
0
1000
2000
3000
4000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
POWER-UP AND DOWN THROUGH EN/UVLO
POWER-UP AND DOWN THROUGH EN/UVLO
(VIN = 24V, VOUT = 5V, IOUT = 25mA, PFM MODE)
(VIN = 24V, VOUT = 3.3V, IOUT = 25mA, PFM MODE)
toc29
toc30
2V/div
2V/div
VEN/UVLO
VEN/UVLO
5V/div
VOUT
2V/div
5V/div
VOUT
5V/div
VRESET
VRESET
4ms/div
4ms/div
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(V = V
= 24V, V
= V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN
EN/UVLO
SGND
PGND A A
All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1,
unless otherwise noted.)
POWER-UP AND DOWN THROUGH EN/UVLO
POWER-UP AND DOWN THROUGH EN/UVLO
(VIN = 24V, VOUT = 5V, IOUT = 4A, PWM MODE)
(VIN = 24V, VOUT = 3.3V, IOUT = 4A, PWM MODE)
toc31
toc32
2V/div
2V/div
2V/div
VEN/UVLO
VEN/UVLO
VOUT
VOUT
5V/div
5V/div
5A/div
5V/div
5A/div
VRESET
IOUT
VRESET
IOUT
4ms/div
4ms/div
POWER-UP WITH 2.5V BIAS
(VIN = 24V, VOUT = 3.3V, IOUT = 0A, PWM MODE)
POWER-UP WITH 2.5V BIAS
(VIN = 24V, VOUT = 5V, IOUT = 0A, PWM MODE)
toc33
toc34
2V/div
2V/div
VEN/UVLO
VEN/UVLO
2V/div
5V/div
1V/div
5V/div
VOUT
VOUT
VRESET
VRESET
4ms/div
4ms/div
LOAD TRANSIENT
(VIN = 24V, VOUT = 5V, IOUT = 0A TO 2A, PWM MODE)
LOAD TRANSIENT
(VIN = 24V, VOUT = 5V, IOUT = 2A TO 4A, PWM MODE)
toc36
toc35
100mV/div
VOUT (AC)
VOUT (AC)
100mV/div
2A/div
IOUT
IOUT
2A/div
400µs/div
400µs/div
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(V = V
= 24V, V
= V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN
EN/UVLO
SGND
PGND A A
All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1,
unless otherwise noted.)
LOAD TRANSIENT
LOAD TRANSIENT
(VIN = 24V, VOUT = 3.3V, IOUT = 0A TO 2A, PWM MODE)
(VIN = 24V, VOUT = 3.3V, IOUT = 2A TO 4A, PWM MODE)
toc37
toc38
VOUT (AC)
100mV/div
VOUT (AC)
100mV/div
2A/div
1A/div
IOUT
IOUT
400µs/div
400µs/div
LOAD TRANSIENT
LOAD TRANSIENT
(VIN = 24V, VOUT = 3.3V, IOUT = 25mA TO 2A, PFM MODE)
(VIN = 24V, VOUT = 5V, IOUT = 25mA TO 2A, PFM MODE)
toc39
toc40
100mV/div
VOUT (AC)
VOUT (AC)
100mV/div
IOUT
IOUT
1A/div
1A/div
400µs/div
400µs/div
LOAD TRANSIENT
LOAD TRANSIENT
(VIN = 24V, VOUT = 3.3V, IOUT = 25mA TO 2A, DCM MODE)
(VIN = 24V, VOUT = 5V, IOUT = 25mA TO 2A, DCM MODE)
toc41
toc42
100mV/div
VOUT (AC)
VOUT (AC)
100mV/div
IOUT
1A/div
1A/div
IOUT
400µs/div
400µs/div
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(V = V
= 24V, V
= V
= 0V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.
IN
EN/UVLO
SGND
PGND A A
All voltages are referenced to GND, unless otherwise noted. The circuit values for different output-voltage applications are as in Table 1,
unless otherwise noted.)
OUTPUT SHORT IN STEADY STATE
(VIN = 24V, VOUT = 5V, PWM MODE)
STARTUP INTO SHORT
(VIN = 24V, VOUT = 5V, PWM MODE)
SYNC FREQUENCY AT 630kHz
(VIN = 24V, VOUT = 5V, IOUT = 4A, PWM MODE)
toc45
toc44
toc43
10V/div
2V/div
20V/div
VLX
VEN/UVLO
VOUT
500mV/div
20V/div
VLX
VOUT
5V/div
5V/div
50mV/div
5V/div
VLX
5A/div
SHORT
IOUT
5A/div
VSYNC
IOUT
10µs/div
2ms/div
20ms/div
BODE PLOT
(VIN = 24V, VOUT = 5V, IOUT = 4A)
OUTPUT CURRENT
vs. AMBIENT TEMPERATURE
BODE PLOT
(VIN = 24V, VOUT = 3.3V, IOUT = 4A)
toc48
toc46
toc47
40
30
120
5
4
3
2
1
0
40
30
120
100
80
PHASE
100
80
PHASE
20
20
60
60
10
10
40
40
0
0
VOUT = 5V
20
20
GAIN
GAIN
-10
-20
-30
-40
-10
-20
-30
-40
0
0
-20
-40
-60
-20
-40
-60
VOUT = 3.3V
fCR = 36.49kHz,
PHASE MARGIN = 63°
fCR = 33.33kHz,
PHASE MARGIN = 58.7°
105
103
104
105
103
104
FREQUENCY (Hz)
0
20
40
60
80
100 120 140
FREQUENCY (Hz)
AMBIENT TEMPERATURE (°C)
RADIATED EMISSION PLOT
CONDUCTED EMISSION PLOT
(NO FILTER C18 = C19 = C20 = C21 = C22 = OPEN, L1 = SHORT)
(WITH FILTER C18 = C19 = C20 = C21 = C22 = 4.7µF, L1 = 8.2µH)
toc49
toc50
CISPR-22 CLASS B QP LIMIT
60
60
50
CISPR-22 CLASS B AVG LIMIT
50
CISPR-22 CLASS B QP LIMIT
40
AVERAGE EMISSION
40
30
PEAK EMISSION
30
VERTICAL SCAN
20
20
10
10
0
HORIZONTAL SCAN
1000
30
100
0.15
1
10
30
FREQUENCY (MHz)
FREQUENCY (MHz)
CONDITIONS : VIN = 24V, VOUT = 5V, IOUT = 4A
FROM : MAXM17536EVKIT#
CONDITIONS : VIN = 24V, VOUT = 5V, IOUT = 4A
FROM : MAXM17536EVKIT#
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Pin Configuration
OUT
IN
PGND
DL
OUT
MODE/SYNC
+
29
26
25
1
2
3
4
28
27
23
V
CC
OUT
OUT
24
RESET
22
21
20
MAXM17536
PGND
PGND
RT
EP1
EP2
SGND
5
6
CF
FB
19
18
PGND
EP3
PGND
PGND
7
8
9
10
11
12
13
14
15
16
17
LX
SS
EN/UVLO
IN
PGND
EXTVCC
BST
PGND
PGND PGND
29-PIN SiP
(9mm x 15mm x 4.32mm)
Pin Description
PIN
NAME
FUNCTION
is bypassed to PGND internally through a 2.2µF capacitor.
5V LDO Output. The V
CC
1
V
CC
Do not connect any external components to the V
pin.
CC
Open-Drain RESET Output. The RESET output 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. See the RESET Output
section for more details.
2
3
RESET
Switching Frequency Programming. Connect a resistor from RT to SGND to set the regulator's
switching frequency. Leave RT open for the default 450kHz frequency. See the Setting the Switching
Frequency (RT) section for more details.
RT
4
5
SGND
CF
Analog Ground.
Compensation Pin. Connect a 2.2pF capacitor from CF to FB.
Feedback Input. Connect FB to the center tap of an external resistor-divider from the OUT to SGND to
set the output voltage.
6
FB
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Pin Description (continued)
PIN
NAME
FUNCTION
7
SS
Soft-Start Input. Connect a capacitor from SS to SGND to set the soft-start time.
Enable/Undervoltage-Lockout Input. Connect a resistor from EN/UVLO to SGND to set the UVLO
threshold. By default, the module is enabled with the EN/UVLO pin open.
8
EN/UVLO
IN
Power-Supply Input. Decouple to PGND with a capacitor; place the capacitor close to the IN and
PGND pins.
9, 28
10, 14-21,
27
PGND
EXTVCC
BST
Power Ground
External Power Supply Input for the Internal LDO. Applying a voltage between 4.7V and 24V at the
EXTVCC pin bypasses the internal LDO and improves efficiency.
11
12
Boost Flying Capacitor Node. Internally a 0.1μF is connected from BST to LX. Do not connect any
external components to the BST pin.
13
22-25
26
LX
OUT
DL
Switching Node. Leave unconnected; do not connect any external components to the LX pin.
Regulator Output Pin. Connect a capacitor from OUT to PGND.
Gate Drive for Low-Side MOSFET. Do not connect any external components to the DL pin.
MODE Pin Configures the Part to Operate in PWM, PFM, or DCM Modes of Operation. Leave MODE
unconnected for PFM operation (pulse skipping at light loads). Connect MODE to SGND for
MODE/
SYNC
29
constant frequency PWM operation at all loads. Connect MODE to V
for DCM operation.
CC
The device can be synchronized to an external clock using this pin. See the Mode Selection (MODE)
section for more details.
EP1, EP2,
EP3
Exposed Pad. Create a large copper plane below the module connecting EP1, EP2, and EP3 to
improve heat dissipation capability. PGND and SGND are shorted through this plane.
—
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Functional Diagrams
Internal Diagram
MAXM17536
IN
LDO
V
CC
SELECT
1µF
1µF
2.2µF
INLDO
EXTVCC
BST
4.7Ω
3.32MΩ
LDO
0.1µF
0.1µF
CURRENT-SENSE
LOGIC
LX
SGND
4.7µH
EN/UVLO
OUT
PEAK
CURRENT-
MODE
1.215V
0.22µF
CONTROLLER
HICCUP
PGND
DL
RT
4.7Ω
OSCILLATOR
CF
FB
MODE
SELECTION
LOGIC
MODE/
SYNC
ERROR AMPLIFIER/
LOOP COMPENSATION
SLOPE
COMPENSATION
V
CC
SWITCHOVER
LOGIC
RESET
5μA
SS
FB
RESET
LOGIC
HICCUP
EN/UVLO
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
PFM-Mode Operation
Detailed Description
The PFM mode of operation disables negative inductor
current and additionally skips pulses at light loads for high
efficiency. In PFM mode, the inductor current is forced to
a fixed peak of 2A (typ) every clock cycle until the output
rises to 102.3% of the nominal voltage. Once the output
reaches 102.3% of the nominal voltage, both the high-
side and low-side FETs are turned off and the device
enters hibernate operation until the load discharges the
output to 101.1% of the nominal voltage. Most of the
internal blocks are turned off in hibernate operation to
minimize quiescent current. After the output falls below
101.1% of the nominal voltage, the device comes out
of hibernate operation, turns on all internal blocks, and
again commences the process of delivering pulses
of energy to the output until it reaches 102.3% of the
nominal output voltage. The advantage of the PFM
mode is higher efficiency at light loads because of lower
quiescent current drawn from the supply. The disadvantage
is that the output-voltage ripple is higher compared to
PWM or DCM modes of operation and switching frequency
is not constant at light loads.
The MAXM17536 is a high-efficiency, high-voltage,
synchronous step-down module with dual-integrated
MOSFETs that operates over a 4.5V to 60V input, and
supports a programmable output voltage from 0.9V to
12V, delivering up to 4A current. Built-in compensation
for the entire output-voltage range eliminates the need
for external components. The feedback (FB) regulation
accuracy over -40°C to +125°C is ±1.5%.
The device features a peak-current-mode control
architecture. An internal transconductance-error amplifier
produces an integrated error voltage at an internal node
that sets the duty cycle using a PWM comparator, a high-
side current-sense amplifier, and a slope-compensation
generator. At each rising edge of the clock, the high-
side MOSFET turns on and remains on until either the
appropriate or maximum duty cycle is reached, or the peak
current limit is detected. During the high-side MOSFET’s
on-time, the inductor current ramps up. During the second
half of the switching cycle, the high-side MOSFET turns
off and the low-side MOSFET turns on. The inductor
releases the stored energy as its current ramps down
and provides current to the output. The device features a
MODE/SYNC pin that can be used to operate the device
in PWM, PFM, or DCM control schemes and to synchronize
the switching frequency to an external clock. The device
integrates adjustable-input undervoltage lockout,
adjustable soft-start, open-drain RESET, auxiliary
bootstrap LDO, and DL-to-OUT short-detection features.
DCM-Mode Operation
DCM mode of operation features constant frequency
operation down to lighter loads than PFM mode, by not
skipping pulses but only disabling negative inductor
current at light loads. DCM operation offers efficiency
performance that lies between PWM and PFM modes
Linear Regulator
The MAXM17536 has two internal low-dropout (LDO)
regulators that powers V . During power-up, when
the EN/UVLO pin voltage is above the true shutdown
Mode Selection (MODE)
The logic state of the MODE/SYNC pin is latched when
CC
V
CC
and EN/UVLO voltages exceed the respective UVLO
rising thresholds and all internal voltages are ready to
allow LX switching. If the MODE/SYNC pin is open at
power-up, the device operates in PFM mode at light
loads. If the MODE/SYNC pin is grounded at power-up,
the device operates in constant-frequency PWM mode
at all loads. Finally, if the MODE/SYNC pin is connected
voltage (0.8V), then the V
is powered from INLDO.
CC
When V
voltage is above the V
UVLO threshold
CC
CC
and EXTVCC voltage is greater than 4.7V (typ) the V
is powered from EXTVCC LDO. Only one of the two LDOs
is in operation at a time depending on the voltage level
present at EXTVCC. Powering V
increases efficiency at higher input voltages. EXTVCC
voltage should not exceed 24V.
CC
from EXTVCC
CC
to V
at power-up, the device operates in constant
CC
frequency DCM mode at light loads. State changes on the
MODE/SYNC pin are ignored during normal operation.
Typical V
output voltage is 5V. Internally V
is
CC
CC
PWM-Mode Operation
bypassed with a 2.2μF ceramic capacitor to PGND. See
the Electrical Characteristics table for the current limit
details for both the regulators. In applications where the
buck converter output is connected to the EXTVCC pin,
if the output is shorted to ground, then the transfer from
EXTVCC LDO to INLDO happens seamlessly without any
impact on the normal functionality.
In PWM mode, the inductor current is allowed to go
negative. PWM operation provides constant frequency
operation at all loads, and is useful in applications
sensitive to changes in switching frequency. However,
the PWM mode of operation gives lower efficiency at light
loads compared to PFM and DCM modes of operation.
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Setting the Switching Frequency (RT)
External Frequency Synchronization (SYNC)
The switching frequency of the MAXM17536 can be
programmed from 100kHz to 2.2MHz by using a resistor
connected from RT to SGND. The switching frequency
The internal oscillator of the MAXM17536 can be
synchronized to an external clock signal on the MODE/
SYNC pin. The external synchronization clock frequency
(f ) is related to the resistor connected at the RT pin
SW
must be between 1.1 x f
and 1.4 x f , where f
is the
SW
SW
SW
(R ) by the following equation:
frequency programmed by the RT resistor. When an
external clock is applied to the MODE/SYNC pin, the
internal oscillator frequency changes to the external
clock frequency (from the original frequency based on
the RT setting) after detecting 16 external clock edges.
The converter operates in PWM mode during synchro-
nization operation. When the external clock is applied
to the MODE/SYNC pin, the mode of operation changes
to PWM from the initial state of PFM/DCM. When the
external clock is removed on-the-fly then the internal
oscillator frequency changes to the RT set frequency and
the converter still continues to operate in PWM mode.
The minimum external clock pulse-width high should be
greater than 50ns. See the MODE/SYNC section in the
Electrical Characteristics table for details.
RT
3
19 × 10
R
− 1.7
RT
f
SW
where R is in kΩ and f
is in kHz. Leaving the RT pin
RT
SW
open causes the device to operate at the default switching
frequency of 450kHz. See the Electrical Characteristics
table for RT resistor value recommendations for a few
common frequencies.
Operating Input-Voltage Range
The minimum and maximum operating input voltages for
a given output voltage should be calculated as follows:
DL-to-OUT Short Detection
V
+ (I
× 0.076)
−9
OUT
OUT(MAX)
V
=
+ (I
× 0.04)
OUT(MAX)
In the MAXM17536, DL and OUT pins are adjacent to
each other. To prevent damage to the low-side FET in
case the DL pin is shorted to the OUT pins, the DL-to-
OUT short detection feature has been implemented. If the
MAXM17536 detects that the DL pin is shorted to the OUT
pins before startup, the startup sequence is not initiated
and output voltage is not soft-started.
IN(MIN)
1− (f
× 230×10
)
SW(MAX)
V
OUT
× t
V
=
IN MAX
(
)
f
SW MAX
ON MIN
( )
(
)
where,
Overcurrent Protection
V
OUT
= Steady-state output voltage,
The MAXM17536 is provided with a robust overcurrent
protection (OCP) scheme that protects the modules under
overload and output short-circuit conditions. A cycle-by-
cycle peak current limit turns off the high-side MOSFET
whenever the high-side switch current exceeds an internal
limit of 7.8A (typ). The module enters hiccup mode of
operation, either if one occurrence of the runaway current
limit 8.8A (typ), or if the FB node goes below 64.5% of its
nominal regulation threshold after soft-start is complete.
In hiccup mode, the module is protected by suspending
switching for a hiccup timeout period of 32,768 switching
cycles. Once the hiccup timeout period expires, soft-start
is attempted again. Hiccup mode of operation ensures low
power dissipation under output overload or short-circuit
conditions. Note that when soft-start is attempted under
overload condition, if feedback voltage does not exceed
64.5% of desired output voltage, the device switches at
half the programmed switching frequency.
I
f
t
= Maximum load current,
OUT(MAX)
= Maximum switching frequency,
SW(MAX)
= Worst-case minimum switch on-time (160ns).
ON(MIN)
Also, for duty cycle > 0.5:
−6
V
= (4.04× V
) − (35×10 × f
)
SW
IN(MIN)
OUT
where f
is the switching frequency in Hz.
SW
Choose the greater of the two V
the above equations as the minimum operating input voltage.
values obtained from
IN(MIN)
The Component Selection Table, Table 1 provides the
operating input-voltage range and the optimum switching-
frequency range for the different selected output voltages.
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
The MAXM17536 is designed to support a maximum load
current of 4A. The inductor ripple current is calculated as
follows:
Thermal-Shutdown Protection
Thermal shutdown protection limits total power dissipation
in the MAXM17536. When the junction temperature of
the device exceeds +165°C (typ), an on-chip thermal sen-
sor shuts down the device, allowing the device to cool.
The thermal sensor turns the device on again after the
junction temperature cools by 10°C. Soft-start resets
during thermal shutdown. Carefully evaluate the total
power dissipation (see the Power Dissipation section)
to avoid unwanted triggering of the thermal shutdown in
normal operation.
V
− V
− 0.071×I
V
+ 0.051×I
OUT OUT
IN
OUT
L × f
OUT
∆I =
×
V
− 0.02×I
OUT
SW
IN
where:
V
V
= Steady-state output voltage
OUT
= Operating input voltage
= Switching frequency
IN
f
SW
Applications Information
L = Power module output inductance (4.7µH ±20%)
= Required output (load) current
Input-Capacitor Selection
I
OUT
The input-filter capacitor reduces peak currents drawn
from the power source and reduces noise and voltage
ripple on the input caused by the circuit’s switching.
The following condition should be satisfied at the desired
load current, I
:
OUT
∆I
The input capacitor RMS current requirement (I
defined by the following equation:
) is
I
+
< 7.15
RMS
OUT
2
RESET Output
V
× V
(
− V
OUT
IN
OUT
)
The MAXM17536 includes a comparator to monitor the
output voltage. The open-drain RESET output requires
an external pullup resistor. RESET goes high (high
impedance) 1024 switching cycles after the regulator
output increases above 95.5% of the designed
nominal regulated voltage. RESET goes low when the
regulator output voltage drops to below 92.5% of the
nominal regulated voltage. RESET also goes low during
thermal shutdown.
√
I
=
I
×
RMS
OUT MAX
(
)
V
IN
where, I
is the maximum load current. I
RMS
a maximum value when the input voltage equals twice
the output voltage (V = 2 x V ), so I
has
OUT(MAX)
=
RMS(MAX)
IN
OUT
I
/2. Choose an input capacitor that exhibits less
OUT(MAX)
than a +10°C temperature rise at the RMS input current
for optimal long-term reliability. Use low-ESR ceramic
capacitors with high ripple-current capability at the input.
X7R capacitors are recommended in industrial applications
Prebiased Output
When the MAXM17536 starts into a prebiased output,
both the high-side and the low-side switches are turned
off so that the converter does not sink current from the
output. High-side and low-side switches do not start
switching until the PWM comparator commands the first
PWM pulse, at which point switching commences. The
output voltage is then smoothly ramped up to the target
value in alignment with the internal reference.
for their temperature stability. The C capacitor values
in Table 1 are the minimum recommended values for the
associated operating conditions.
IN
In applications where the source is located distant from
the MAXM17536 input, an electrolytic capacitor should
be added in parallel to the ceramic capacitor to provide
necessary damping for potential oscillations caused by
the inductance of the longer input power path and input
ceramic capacitor.
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Output-Capacitor Selection
Setting the Input Undervoltage-Lockout Level
X7R ceramic output capacitors are preferred due to their
stability over temperature in industrial applications. The
output capacitors are 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. The minimum required output
capacitance can be calculated as follows:
The MAXM17536 offers an adjustable input undervoltage
lockout level. Set the voltage at which MAXM17536 turns
on. Calculate R3 as follows:
3.32 × 1.215
R3 =
V
− 1.215
(
)
INU
where R3 is in MΩ and V
is the voltage at which the
INU
MAXM17536 is required to turn on. Ensure that V
is
I
× t
INU
1
2
STEP
RESPONSE
OUT
C
=
×
OUT
higher than 0.8 x V
.
∆ V
OUT
Loop Compensation
The MAXM17536 is internally loop-compensated. Connect
a 2.2pF capacitor from CF to FB for stable operation.
0.33
1
t
+
RESPONSE
f
f
C
SW
Typically, designs with crossover frequency (f ) less than
C
where:
f
/10 and less than 40kHz offers good phase margin
SW
I
t
= Load-current step,
STEP
and transient response. For other choices of f , the
design should be carefully evaluated according to user
requirements.
C
= Response time of the controller,
RESPONSE
V
OUT
= Allowable output-voltage deviation,
f
C
= Target closed-loop crossover frequency,
Adjusting Output Voltage
f
= Switching frequency.Select f to be 1/10th of f
if
Set the output voltage with a resistive voltage-divider
connected from the positive terminal of the output capacitor
SW
C
SW
the swtiching frequency is less than or equal to 400kHz.
Select f to be 40kHz if the switching frequency is more
(V
) to SGND (see Figure 2). Connect the center
C
OUT
than 400kHz.
node of the divider to the FB pin. To choose the resistive
voltage-divider values calculate for resistor R1, then R2.
Soft-Start Capacitor Selection
First, calculate resistor R1 from the output to FB as follows:
The MAXM17536 implements adjustable soft-start operation
to reduce inrush current. A capacitor connected from
the SS pin to SGND programs the soft-start time. The
selected output capacitance (C ) and the output voltage
SEL
(V
) determine the minimum required soft-start
OUT
where:
capacitor as follows:
R1 is in kΩ
−6
C
≥
28 × 10
×
C
× V
SEL OUT
f
= Desired crossover frequency (kHz)
SS
C
C
= Derated value of the capacitor (µF)
OUT
The soft-start time (t ) is related to the capacitor
SS
Then, calculate resistor R2 from FB to SGND as follows:
connected at SS (C ) by the following equation:
SS
R1 × 0.9
C
R2 =
SS
t
=
V
− 0.9
SS
(
)
5.55
OUT
where t
is in milliseconds and C
is in nanofarads.
SS
SS
For example, to program a 4ms soft-start time, a 22nF
capacitor should be connected from the SS pin to SGND.
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
V
OUT
MAXM17536
MAXM17536
R
R
1
2
EN/UVLO
SGND
FB
R
SGND
3
Figure 1. Setting the Input-Undervoltage Lockout
Figure 2. Setting the Output Voltage
Component Selection Table
Table 1. Selection Component Values
V
(V)
V
R
R
f
R
RT
IN
OUT
1
2
SW
CIN
COUT
(V)
0.9
1.2
1.5
1.8
2.5
3.3
5
(kΩ)
33.2
39.2
52.3
71.5
57.6
121
(kΩ)
Open
118
(kHz)
300
400
400
400
400
300
450
750
900
(kΩ)
61.9
45.3
45.3
45.3
45.3
61.9
Open
24
4.5 to 16
4.5 to 17
4.5 to 21
4.5 to 26
4.5 to 35
4.5 to 60
7 to 60
4 x 4.7µF, 1206, X7R, 50V
4 x 4.7µF, 1206, X7R, 50V
4 x 4.7µF, 1206, X7R, 50V
4 x 4.7µF, 1206, X7R, 50V
4 x 4.7µF, 1206, X7R, 50V
4 x 4.7µF, 1206, X7R, 100V
4 x 4.7µF, 1206, X7R, 100V
4 x 4.7µF, 1206, X7R, 100V
4 x 4.7µF, 1206, X7R, 100V
12 x 47μF, 1210, X7R, 10V
9 x 47μF, 1210, X7R, 10V
7 x 47μF, 1210, X7R, 10V
5 x 47μF, 1210, X7R, 10V
5 x 47μF, 1210, X7R, 10V
4 x 47μF, 1210, X7R, 10V
3 x 22μF, 1210, X7R, 25V
3 x 22μF, 1210, X7R, 25V
3 x 22μF, 1210, X7R, 25V
78.7
71.5
32.4
45.3
38.3
37.4
27.4
174
11 to 60
16 to 60
8
294
12
340
19.6
η is the efficiency of the power module at the desired
operating conditions. See the Typical Operating
Characteristics for the power-conversion efficiency or
measure the efficiency to determine the total power
Power Dissipation
The power dissipation inside the module leads to increase
in the junction temperature of the MAXM17536. The
power loss inside the module at full load can be estimated
as follows:
dissipation. The junction temperature (T ) of the module
J
can be estimated at any given maximum ambient
2
temperature (T ) from the following equation:
A
1
P
OUT
P
= P
−1 −
×
LOSS
OUT
η
1000× V
OUT
T = T + (θ x P )
LOSS
J
A
JA
45.15 21.67
For the MAXM17536 evaluation board, the thermal
(1+ 0.0043× T )×
−
A
V
V
IN
resistance from junction-to-ambient (θ ) is 24°C/W.
OUT
JA
Operating the module at junction temperatures greater
than +125°C degrades operating lifetimes. An EE-SIM
model is available for the MAXM17536 to simulate
efficiency and power loss for the desired operating condi-
tions.
where:
P
V
V
= Total output power
= Output voltage
OUT
OUT
= Input voltage
IN
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
● A ceramic input-filter capacitor should be placed close
PCB Layout Guidelines
to the IN pins of the module. This eliminates as much
trace-inductance effects as possible and gives the
module a cleaner voltage supply.
● All connections carrying pulsed currents must be
very short and as wide as possible. The inductance
of these connections must be kept to an absolute
minimum due to the high di/dt of the currents. Since
inductance of a current carrying loop is proportional to
the area enclosed by the loop, if the loop area is made
very small, inductance is reduced. Additionally, small
current-loop areas reduce radiated EMI.
● PCB layout also affects the thermal performance of
the design. A number of thermal vias that connect to
a large ground plane should be provided under the
exposed pad of the part, for efficient heat dissipation.
● For a sample layout that ensures first pass success,
refer to the MAXM17536 evaluation kit PCB layout
available at www.maximintegrated.com.
Typical Application Circuits
Typical Application Circuit for 5V Output
V
IN
7V to 60V
C1
C2
C3
C4
4.7µF 4.7µF 4.7µF 4.7µF
IN
V
OUT
5V, 4A
EN/UVLO
OUT
R3
715kΩ
MAXM17536
R1
174kΩ
C5
C6
C7
V
CC
EXTVCC
FB
47µF 47µF 47µF
DL
C
F
BST
LX
RESET
R2
38.3kΩ
2.2pF
SS
CF
RT
C
SS
MODE/SYNC
SGND
22nF
PGND
C1,C2,C3,C4: GRM31CZ72A475KE11L
C5,C6,C7: GRM32ER71A476KE15L
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Typical Application Circuits (continued)
Typical Application Circuit 3.3V
V
4.5V TO 60V
IN
C1
C2
C3
C4
4.7µF 4.7µF 4.7µF 4.7µF
IN
3.3V, 4A
C5
V
OUT
EN/UVLO
OUT
FB
R3
1.3MΩ
R1
121kΩ
MAXM17536
C6
C7
C8
V
CC
47µF 47µF 47µF 47µF
DL
C
F
BST
LX
R2
RESET
2.2pF
45.3kΩ
SS
CF
RT
MODE/SYNC
C
22nF
SS
SGND EXTVCC
PGND
R4
61.9kΩ
C1 ,C2 ,C3 ,C4: GRM31CZ72A475KE11L
C5, C6, C7, C8: GRM32ER71A476KE15L
Ordering Information
PART NUMBER
MAXM17536ALY#
MAXM17536ALY#T
TEMP RANGE
PIN-PACKAGE
-40°C to +125°C 29 SiP
-40°C to +125°C 29 SiP
#Denotes a RoHS-compliant device that may include lead(Pb)
that is exempt under the RoHS requirements.
T = Tape and reel.
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MAXM17536
4.5V to 60V, 4A High-Efficiency, DC-DC Step-Down
SiP Power Module with Integrated Inductor
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
0
6/19
Initial release
—
Updated Typical Application Circuit, Electrical Characteristics, Functional Diagram,
Operating Input-Voltage Range, Power Dissipation, and Typical Application Circuit for
3.3V Output sections; replaced TOC47 and Typical Application Circuit for 5V Output;
updated graphics to standard; corrected typos
1-3, 11, 14-17,
19-21
1
8/19
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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.
│ 22
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