General Description
The Himalaya series of voltage regulator ICs and Power
Modules enable cooler, smaller and simpler power supply
solutions. The MAXM17503 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 2.5A continuous
output current with excellent line and load regulation
over an output voltage range of 0.9V to 12V. The device
only requires five external components to complete
the total power solution. 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.
The device can be operated in the pulse-width modulation
(PWM), pulse-frequency modulation (PFM), or discontinuous
conduction mode (DCM) control schemes.
The MAXM17503 is available in a low-profile, highly
thermal-emissive, compact, 29-pin 9mm x 15mm x
2.8mm SiP package that reduces power dissipation in
the package and enhances efficiency. The package is
easily soldered onto a printed circuit board and suit-
able for automated circuit board assembly. The device
can operate over the industrial temperature range from
-40°C to +125°C.
Applications
●Industrial Power Supplies
●Distributed Supply Regulation
●FPGA and DSP Point-of-Load Regulator
●Base Station Point-of-Load Regulator
●HVAC and Building Control
Benets and Features
●Reduces Design Complexity, Manufacturing Risks,
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 Prole 9mm x 15mm x 2.8mm SiP Package
• Simplied 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 12V
• Adjustable Frequency with External Frequency
Synchronization (100kHz to 1.8MHz)
• Soft-Start Programmable
• Autoswitch PWM, PFM, or DCM Current-Mode Control
• Optional Programmable EN/UVLO
Ordering Information appears at end of data sheet.
19-7451; Rev 2; 11/16
4.5V TO 60VIN
SS
SGND PGND PGND
FB
OUT
OUT
OUT
OUT
OUT
OUT
OUT
SYNC
MAXM17503
V
IN
V
OUT
V
CC
OPTIONAL
C
IN
R
U
R
B
C
OUT
EP3
V
CC
RESET
C
SS
EN MODE RT
CF
EP1
R
T
MAXM17503 4.5V to 60V, 2.5A High-Efciency, DC-DC
Step-Down Power Module with Integrated Inductor
Typical Application Circuit
EVALUATION KIT AVAILABLE
IN to PGND (Note 2) .............................................-0.3V to +65V
EN to SGND (Note 2) ............................................ -0.3V to +65V
VCC .............................................-0.3V to min (VIN + 0.3V, 6.5V)
FB, RESET, SS, CF, MODE,
SYNC, RT to SGND .........................................-0.3V to +6.5V
OUT to PGND (VIN < 25V) .........................-0.3V to (VIN + 0.3V)
OUT to PGND (VIN ≥ 25V) .................................... -0.3V to +25V
LX to PGND................................................-0.3V to (VIN + 0.3V)
BST to PGND ........................................................-0.3V to +70V
BST to VCC ...........................................................-0.3V to +65V
BST to LX .............................................................-0.3V to +6.5V
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
Junction-to-Ambient Thermal Resistance (θJA) ...........30.8°C/W
Electrical Characteristics
(VIN = VEN = 24V, RRT = 40.2kΩ (500kHz) to SGND, VPGND = VMODE = VSYNC = VSGND = 0V, VCC = LX = SS = RESET = OUT = open,
VBST to VLX = 5V, VFB = 1V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C. All voltages are
referenced to SGND, unless otherwise noted.) (Note 4)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INPUT SUPPLY (VIN)
IN Input Voltage Range VIN 4.5 60 V
Input Shutdown Current IIN_SH VEN = 0V 10.5 13 μA
Input Quiescent Current
IQ_PFM_HIB MODE = RT = open 125 μA
IQ_DCM MODE = VCC 1.16 1.8 mA
IQ_PWM Normal switching mode, no load 9.5 mA
LOGIC INPUTS
EN Threshold VENR VEN rising 1.192 1.215 1.26 V
VENF VEN falling 1.068 1.09 1.131
Enable Pullup Resistor RENP Pullup resistor between IN and EN pins 3.15 3.3 3.45 MΩ
LDO
VCC Output Voltage Range VCC 6V < VIN < 60V, 1mA < IVCC < 25mA 4.75 5 5.25 V
VCC Current Limit IVCC_MAX VIN = 6V, VCC = 4.3V 26.5 60 100 mA
VCC Dropout VCC_DO VIN = 4.5V, IVCC = 20mA 4.2 V
VCC UVLO VCC_UVR VCC rising 4.05 4.2 4.3 V
VCC_UVF VCC falling 3.65 3.8 3.9
OUTPUT SPECIFICATIONS
Line Regulation Accuracy VIN = 6.5V to 60V, VOUT = 5V 0.1 mV/V
Load Regulation Accuracy Tested with IOUT = 0A and 1A 1 mV/A
MAXM17503 4.5V to 60V, 2.5A High-Efciency, DC-DC
Step-Down Power Module with Integrated Inductor
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Note 1: SGND and PGND are internally connected.
Note 2: See the Pin Description for the connection of the backside exposed pad.
Note 3: Data taken using Maxim's evaluation kit, MAXM17503EVKIT#.
Absolute Maximum Ratings (Notes 1, 2)
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 Thermal Characteristics (Note 3)
Electrical Characteristics (continued)
(VIN = VEN = 24V, RRT = 40.2kΩ (500kHz) to SGND, VPGND = VMODE = VSYNC = VSGND = 0V, VCC = LX = SS = RESET = OUT = open,
VBST to VLX = 5V, VFB = 1V, TA = TJ = -40°C to +125ºC, unless otherwise noted. Typical values are at TA = +25ºC. All voltages are
referenced to SGND, unless otherwise noted.) (Note 4)
Note 4: All limits are 100% tested at TA = +25°C. Maximum and minimum limits are guaranteed by design and characterized over
temperature.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
FB Regulation Voltage VFB_REG
MODE = SGND 0.887 0.910 V
MODE = open 0.890 0.915 0.936
FB Input Bias Current IFB 0V < VFB < 1V, TA = +25°C -50 +50 nA
FB Undervoltage Trip Level to
Cause Hiccup VFB_HICF 0.56 0.58 0.65 V
Hiccup Timeout 32,768 Cycles
SOFT-START (SS)
Charging Current ISS VSS = 0.5V 4.7 55.3 μA
RT AND SYNC
Switching Frequency fSW
RRT = 210kΩ 90 100 110
kHzRRT = 9.76kΩ 1800
RRT = open 450 500 550
SYNC Frequency Range 1.1x
fSW
1.4x
fSW kHz
SYNC Pulse Width 50 ns
SYNC Threshold VIH 2.1 V
VIL 0.8
MODE
MODE Threshold
VM_DCM MODE = VCC (DCM mode) VCC - 1.6
V
VM_PFM MODE = open (PFM mode) VCC/2
VM_PWM MODE = GND (PWM mode) 1.4
CURRENT LIMIT
Average Current-Limit Threshold IAVG_LIMIT VOUT = VFB = 0.8V, fSW = 200kHz 3.45 A
RESET
RESET Output Level Low IRESET = 10mA 0.4 V
RESET Output Leakage Current VRESET = 5.5V, TA = TJ = +25°C -0.1 +0.1 µA
FB Threshold for RESET
Assertion VFB_OKF VFB falling 90.5 92 94.6 %
FB Threshold for RESET
Deassertion VFB_OKR VFB rising 93.8 95 97.8 %
RESET Deassertion Delay After
FB Reaches 95% Regulation 1024 Cycles
THERMAL SHUTDOWN
Thermal-Shutdown Threshold Temperature rising +165 °C
Thermal-Shutdown Hysteresis 10 °C
MAXM17503 4.5V to 60V, 2.5A High-Efciency, DC-DC
Step-Down Power Module with Integrated Inductor
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(VIN = 4.5V to 60V, VOUT = 0.9 to 12V, IOUT = 0A–2.5A, TA = +25°C, unless otherwise noted.)
40
50
60
70
80
90
100
0 500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCYvs. OUTPUT CURRENT
V
OUT
= 5V, PWM MODE
toc04
MODE = SGND
V
IN
=12V,
f
SW
=740kHz
V
IN
=24V,
f
SW
=740kHz
V
IN
=36V,
f
SW
=740kHz
V
IN
=48V,
f
SW
=500kHz
40
50
60
70
80
90
100
0500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 12V, PFM MODE
toc01
MODE = OPEN
VIN = 24V,
fSW = 1.8MHz
VIN = 36V,
fSW = 1.8MHz
VIN = 48V,
fSW = 1.33MHz
40
50
60
70
80
90
100
0500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 2.5V, PFM MODE
toc07
MODE = OPEN
V
IN
= 5V,
f
SW
= 400kHz
V
IN
= 12V,
f
SW
= 400kHz
V
IN
= 24V,
f
SW
= 400kHz
V
IN
= 36V,
f
SW
= 400kHz
V
IN
= 48V,
f
SW
= 277kHz
40
50
60
70
80
90
100
0500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 12V, PWM MODE
toc02
MODE = SGND
VIN = 24V,
fSW = 1.8MHz
VIN = 36V,
fSW = 1.8MHz
VIN = 48V,
fSW = 1.33MHz
40
50
60
70
80
90
100
0500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 5V, PFM MODE
toc03
MODE = OPEN
VIN = 12V,
fSW = 740kHz
VIN = 24V,
fSW = 740kHz
VIN = 36V,
fSW = 740kHz
VIN = 48V,
fSW = 500kHz
40
50
60
70
80
90
100
0500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 2.5V, PWM MODE
40
50
60
70
80
90
100
0500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 3.3V, PFM MODE
toc05
MODE = OPEN
VIN = 12V,
fSW = 500kHz
VIN = 24V,
fSW = 500kHz
VIN = 36V,
fSW = 500kHz
VIN = 48V,
fSW = 366kHz
40
50
60
70
80
90
100
0 500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCYvs. OUTPUT CURRENT
VOUT = 3.3V, PWM MODE
toc06
MODE = SGND
V
IN
=12V,
f
SW
=500kHz
V
IN
=24V,
f
SW
=500kHz
V
IN
=36V,
f
SW
=500kHz
V
IN
=48V,
f
SW
=366kHz
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MAXM17503 4.5V to 60V, 2.5A High-Efciency, DC-DC
Step-Down Power Module with Integrated Inductor
Typical Operating Characteristics
(VIN = 4.5V to 60V, VOUT = 0.9 to 12V, IOUT = 0A–2.5A, TA = +25°C, unless otherwise noted.)
40
50
60
70
80
90
100
0500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 0.9V, PWM MODE
toc12
MODE=SGND
VIN = 5V,
f
SW
= 300kHz
VIN = 12V,
f
SW
= 300kHz
VIN = 24V,
f
SW
= 214kHz
40
50
60
70
80
90
100
0500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 1.2V, PFM MODE
toc09
V
IN
= 5V,
f
SW
= 350kHz
V
IN
= 12V,
f
SW
= 350kHz
V
IN
= 24V,
f
SW
= 285kHz
V
IN
= 36V,
f
SW
= 200kHz
MODE = OPEN
4.5
4.6
4.7
4.8
4.9
5
5.1
5.2
5.3
5.4
5.5
0500 1000 1500 2000 2500
VOUT (V)
OUTPUT CURRENT (mA)
LOAD REGULATION
V
OUT
= 5V, PFM MODE
toc15
MODE = OPEN
VIN = 24V,
fSW = 740kHz
VIN = 12V,
fSW = 740kHz
VIN = 48V,
fSW = 500kHz
VIN = 36V,
fSW = 740kHz
40
50
60
70
80
90
100
0500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
V
OUT
= 1.2V, PWM MODE
toc10
V
IN
= 5V,
f
SW
= 350kHz
V
IN
= 12V,
fSW
= 350kHz
V
IN
= 24V,
fSW
= 285kHz
V
IN
= 36V,
fSW
= 200kHz
MODE = SGND
40
50
60
70
80
90
100
0500 1000 1500 2000 2500
EFFICIENCY (%)
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 0.9V, PFM MODE
toc11
MODE = OPEN
VIN = 5V,
fSW = 300kHz
VIN = 12V,
fSW = 300kHz
VIN = 24V,
fSW = 214kHz
4.5
4.6
4.7
4.8
4.9
5
5.1
5.2
5.3
5.4
5.5
0500 1000 1500 2000 2500
V
OUT
(V)
OUTPUT CURRENT (mA)
LOAD REGULATION
V
OUT
= 5V, PWM MODE
toc16
MODE = SGND
V
IN
= 12V,
f
SW
= 740kHz
V
IN
= 24V,
f
SW
= 740kHz
V
IN
= 36V,
f
SW
= 740kHz
V
IN
= 48V,
f
SW
= 500kHz
3
3.1
3.2
3.3
3.4
3.5
3.6
0 500 1000 1500 2000 2500
V
OUT
(V)
OUTPUT CURRENT (mA)
LOAD REGULATION
V
OUT
= 3.3V, PFM MODE
toc13
MODE = OPEN
V
IN
= 5.0V
f
SW
=500kHz
V
IN
=12V
f
SW
=500kHz
V
IN
=24V
f
SW
=500kHz
V
IN
=36V
f
SW
=500kHz
V
IN
=48V
f
SW
=366kHz
3
3.1
3.2
3.3
3.4
3.5
3.6
0 500 1000 1500 2000 2500
V
OUT
(V)
OUTPUT CURRENT (mA)
LOAD REGULATION
VOUT = 3.3V, PWM MODE
toc14
MODE=SGN
D
V
IN
= 5.0V
f
SW
=500kHz
V
IN
=12V
f
SW
=500kHz
V
IN
=24V
f
SW
=500kHz
V
IN
=36V
f
SW
=500kHz V
IN
=48V
f
SW
=366kHz
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MAXM17503 4.5V to 60V, 2.5A High-Efciency, DC-DC
Step-Down Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(VIN = 4.5V to 60V, VOUT = 0.9 to 12V, IOUT = 0A–2.5A, TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE RIPPLE
VIN = 24V, VOUT = 5V, IOUT = 2.5A,
MODE = SGND
20mV/div
(AC-
COUPLED)
toc20
2µs/div
VOUT
LOAD CURRENT TRANSIENT RESPONSE
VIN = 24V, VOUT = 3.3V, IOUT = 0.05A -1.25A,
MODE = OPEN
1A/div
toc23
200µs/div
VOUT
IOUT
200mV/div
(AC
COUPLED)
11
11.2
11.4
11.6
11.8
12
12.2
12.4
12.6
12.8
13
0500 1000 1500 2000 2500
V
OUT
(V)
OUTPUT CURRENT (mA)
LOAD REGULATION
V
OUT
= 12V, PFM MODE
toc17
MODE = OPEN
V
IN
= 24V,
f
SW
= 1.8MHz
V
IN
= 36V,
f
SW
= 1.8MHz
V
IN
= 48V,
f
SW
= 1.33MHz
11.00
11.20
11.40
11.60
11.80
12.00
12.20
12.40
12.60
12.80
13.00
0 500 1000 1500 2000 2500
V
OUT
(V)
OUTPUT CURRENT (mA)
LOAD REGULATION
V
OUT
=12V, PWM MODE
toc18
MODE = SGND
V
IN
=24V,
f
SW
= 1.8MHz V
IN
=36V,
f
SW
= 1.8MHz
V
IN
=48V,
f
SW
= 1.33MHz
OUTPUT VOLTAGE RIPPLE
VIN = 24V, VOUT = 3.3V, IOUT = 2.5A,
MODE = SGND
20mV/div
(AC-
COUPLED)
toc19
2µs/div
VOUT
INPUT VOLTAGE RIPPLE
VIN = 24V, VOUT = 3.3V, IOUT = 2.5A,
MODE = SGND
100mV/div
(AC-
COUPLED)
toc21
2µs/div
VIN
INPUT VOLTAGE RIPPLE
VIN = 24V, VOUT = 5V, IOUT = 2.5A,
MODE = SGND
200mV/div
(AC-
COUPLED)
toc22
2µs/div
VIN
LOAD CURRENT TRANSIENT RESPONSE
V
IN
= 24V, V
OUT
= 3.3V, I
OUT
= 0.05A -1.25A,
MODE = SGND
1A/div
toc24
100µs/div
V
OUT
I
OUT
200mV/div
(AC
COUPLED)
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MAXM17503 4.5V to 60V, 2.5A High-Efciency, DC-DC
Step-Down Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(VIN = 4.5V to 60V, VOUT = 0.9 to 12V, IOUT = 0A–2.5A, TA = +25°C, unless otherwise noted.)
LOAD CURRENT TRANSIENT RESPONSE
VIN = 24V, VOUT = 3.3V, IOUT = 0.05A -1.25A,
MODE = VCC
1A/div
toc25
100µs/div
V
OUT
I
OUT
200mV/div
(AC
COUPLED)
LOAD CURRENT TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, IOUT = 0.05A -1.25A,
MODE = OPEN
1A/div
toc26
200µs/div
V
OUT
I
OUT
200mV/div
(AC
COUPLED)
LOAD CURRENT TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, IOUT = 0.05A -1.25A,
MODE = SGND
1A/div
toc27
100µs/div
VOUT
IOUT
200mV/div
(AC
COUPLED)
LOAD CURRENT TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, IOUT = 0.05A -1.25A,
MODE = VCC
1A/div
toc28
100µs/div
V
OUT
I
OUT
200mV/div
(AC
COUPLED)
STARTUP THROUGH ENABLE
V
IN
= 24V, V
OUT
= 3.3V, I
OUT
= 0A,
MODE = SGND
2V/div
toc29
1ms/div
LX
VOUT 5V/div
EN
RESET
20V/div
5V/div
STARTUP WITH 2.5V PREBIAS
V
IN
= 24V, V
OUT
= 3.3V, I
OUT
= 0A,
MODE = SGND
2V/div
toc30
1ms/div
LX
5V/div
EN
RESET
20V/div
5V/div
V
OUT
STARTUP WITH 2.5V PREBIAS
V
IN
= 24V, V
OUT
= 3.3V, I
OUT
= 0A,
MODE = OPEN
2V/div
toc31
1ms/div
LX
5V/div
EN
RESET
20V/div
5V/div
VOUT
SHUTDOWN THROUGH ENABLE
V
IN
= 24V, V
OUT
= 3.3V, I
OUT
= 0A,
MODE = SGND
2V/div
toc32
1ms/div
LX
5V/div
EN
RESET
20V/div
5V/div
V
OUT
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MAXM17503 4.5V to 60V, 2.5A High-Efciency, DC-DC
Step-Down Power Module with Integrated Inductor
Typical Operating Characteristics (continued)
(VIN = 4.5V to 60V, VOUT = 0.9 to 12V, IOUT = 0A–2.5A, TA = +25°C, unless otherwise noted.)
STARTUP THROUGH INPUT SUPPLY
VIN =24V, VOUT = 3.3V, IOUT = 2.5A,
MODE = SGND
2V/div
toc33
1ms/div
LX
VOUT 5V/div
VIN
R
ESET
20V/div
10V/div
STARTUP THROUGH ENABLE
V
IN
= 24V, V
OUT
= 5V, I
OUT
= 0A, MODE = SGND
2V/div
toc35
1ms/div
LX
VOUT
5V/div
EN
RESET
20V/div
5V/div
STARTUP THROUGH INPUT SUPPLY
VIN =24V, VOUT = 5V, IOUT = 2.5A,
MODE = SGND
2V/div
toc37
1ms/div
LX
V
OUT
5V/div
V
IN
RESET
20V/div
10V/div
SHUTDOWN THROUGH INPUT SUPPLY
VIN = 24V, VOUT = 3.3V, IOUT = 2.5A,
MODE = SGND
2V/div
toc34
100µs/div
LX
VOUT
5V/div
VIN
R
ESET
20V/div
20V/div
SHUTDOWN THROUGH ENABLE
V
IN
= 24V, V
OUT
= 5V, I
OUT
= 0A, MODE = SGND
2V/div
toc36
1ms/div
LX
V
OUT
5V/div
EN
RESET
20V/div
5V/div
SHUTDOWN THROUGH INPUT SUPPLY
V
IN
=24V, V
OUT
= 5V, I
OUT
=2.5A,
MODE = SGND
2V/div
toc38
100µs/div
LX
V
OUT
5V/div
V
IN
RESET
20V/div
10V/div
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Typical Operating Characteristics (continued)
(VIN = 4.5V to 60V, VOUT = 0.9 to 12V, IOUT = 0A–2.5A, TA = +25°C, unless otherwise noted.)
OUTPUT SHORT IN STEADY STATE
VIN = 24V, VOUT = 3.3V, IOUT = 0A to SHORT
MODE = SGND
2V/div
toc39
40ms/div
LX
VOUT
10A/div
VIN
IOUT
20V/div
20V/div
SYNC FREQUENCY AT 740 KHZ
VIN = 24V, VOUT = 5V, IOUT = 0A, MODE = GND
2V/div
toc41
2µs/div
LX
VOUT
SYNC
20V/div
5V/div
OUTPUT SHORT DURING STARTUP
VIN = 24V, VOUT = 3.3V, IOUT = SHORT, MODE = SGND
2V/div
toc40
40ms/div
LX
VOUT
10A/div
VIN
IOUT
20V/div
20V/div
-150
-120
-90
-60
-30
0
30
60
90
120
150
1k 10k 100k 1Meg
-50.00
-40.00
-30.00
-20.00
-10.00
0.00
10.00
20.00
30.00
40.00
50.00
PHASE MARGIN (°)
GAIN (dB)
FREQUENCY (Hz)
CLOSED-LOOP BODE PLOT
V
IN
= 24V, V
OUT
= 3.3V, I
OUT
= 2.5A,
MODE = SGND
GAIN
toc42
PHASE
CROSSOVER FREQUENCY = 54.9kHz
PHASE MARGIN = 53.3◦
0
0.5
1
1.5
2
2.5
3
3.5
010 20 30 40 50 60 70 80 90 100110120
OUTOPUT CURRENT (A)
AMBIENT TEMPERATURE (°C)
OUTPUT CURRENT
vs. AMBIENT TEMPERATURE
V
IN
= 24V NO AIR FLOW
toc43
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= 12V
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Typical Operating Characteristics (continued)
2 column (6.96 in.)
OUTVCC
MODE
RT
FB
SS
SYNC
PGND
CF
EP2
RESET EN BSTPGNDIN LXLX
OUT OUT OUT
OUT
OUT
OUT
LX
LX
LX
LX
26
16
17
18
19
20
27
2829 21
23 222425
11
10987 14 15
1312
6
5
4
3
2
EP3
SGND
N.C.
N.C.
EP1
1
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Pin Conguration
PIN NAME FUNCTION
1, 7 N.C. No Connection
2 SYNC Frequency Synchronization. The device can be synchronized to an external clock using this pin.
See the External Frequency Synchronization section for more details.
3 SS Soft-Start Input. Connect a capacitor from SS to SGND to set the soft-start.
4 CF Compensation Filter. Connect capacitor from CF to FB to correct frequency response with
switching frequency below 500kHz. Leave CF open otherwise.
5 FB Feedback Input. Connect FB to the center tap of an external resistor-divider from the OUT to
SGND to set the output voltage. See the Setting the Output Voltage section for more details.
6RT Frequency Set. Connect a resistor from RT to SGND to set the regulator’s switching frequency.
Leave RT open for the default 500kHz frequency.
8 MODE
Light-Load Mode Selection. The MODE pin congures the MAXM17504 to operate in PWM, PFM,
or DCM mode of operation. Leave MODE unconnected for PFM operation (pulse skipping at light
loads). Connect MODE to SGND for constant-frequency PWM operation at all loads. Connect
MODE to VCC for DCM operation. See the MODE Selection (MODE) section for more details.
9 VCC 5V LDO Output. No external connection.
10 SGND Analog Ground. Internally-shorted to PGND. Connect it to PGND through a single point at output
capacitor.
11, 26 PGND Power Ground. Connect the PGND pins externally to the power ground plane.
12–18 OUT Regulator Output Pin. Connect a capacitor from OUT to PGND. See PCB Layout Guidelines
section for more connection details.
19–24 IC Internally Connected to EP2. Please do not connect these pins to external components for any
reason.
25 BST Boost Flying Cap Node. No external connection.
27 IN Input Supply Connection. Bypass to PGND with a capacitor; place the capacitor close to the IN
and PGND pins. See Table 1 for more details
28 EN
Enable/Undervoltage-Lockout Input. Default enable through the pullup 3.3MΩ resistor between
EN and IN. Connect a resistor from EN to SGND to set the UVLO threshold. If the EN/UVLO pin
is driven by an external signal, a 50Ω damping resistor in series with the signal line driving EN/
UVLO is required.
29 RESET Open-Drain RESET Output. The RESET output is driven low if FB drops below 92% of its set
value. RESET goes high 1024 clock cycles after FB rises above 95% of its set value.
EP1 SGND Analog Ground. Connect this pad to 1in x 1in copper island with a lot of vias for cooling.
EP2 LX Switching Node. Connect this pad to a small copper area of 1in x 1in under the device for thermal
relief.
EP3 OUT Connect this pad to the OUT pins and copper area of 1in x 1in.
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Pin Description
EN
VCC
VIN
HICCUP
6.8µH
0.47µF
4.7µF
2.2µF
PEAK
CURRENT-MODE
CONTROLLER
OSCILLATOR
MAXM17503
MODE
SELECTION
LOGIC
RESET
LOGIC
LDO
SGND
5V
SYNC
RT
FB
CF
SS
PGND
RESET
MODE
FB
1.215V
0.1µF
LX
IN
BST
OUT
3.3MΩ
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Functional Diagram
Design Procedure
Setting the Output Voltage
The MAXM17503 supports an adjustable output volt-
age range of 0.9V to 12V from an input voltage range of
4.5V to 60V by using a resistive feedback divider from
OUT to FB. Table 1 provides the feedback dividers for
desired input and output voltages. Other adjustable output
voltages can be calculated by following the procedure to
choose the resistive voltage-divider values:
Calculate resistor RU from the output to FB as follows:
U
C OUT
216 1000
RfC
×
=×
Where RU is in kΩ, crossover frequency (fC) is in kHz,
and output capacitor (COUT) is in μF. Choose fC to be
1/9th of the switching frequency (fSW) if the switching
frequency is less than or equal to 500kHz. If the switching
frequency is more than 500kHz, select fC to be 55kHz.
U
BB
OUT
R 0.9
R k , where R is in k .
V 0.9
×
=ΩΩ
−
Input Voltage Range
Due to the limitation of minimum and maximum duty
cycle, the maximum value (VIN (MAX)) and minimum
value (VIN (MIN)) must accommodate the worst-case
conditions, accounting for the input voltage rises and
drops. To simplify, Table 1 provides operating input
voltage ranges of different desired output voltages.
Input Capacitor Selection
The input capacitor serves to reduce the current peaks
drawn from the input power supply and reduces 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 to improve the
dynamic response. For further operating conditions, the
total input capacitance must be greater than or equal to
the value given by the following equation in order to keep
the input-voltage ripple within specifications and minimize
the high-frequency ripple current being fed back to the
input source:
IN_AVG
IN
IN
I (1 D)
CV f
× −
=∆
SW
×
where:
IIN_AVG is the average input current given by:
OUT
IN_AVG
IN
P
IV
=η×
D is the operating duty cycle, which is approximately
equal to VOUT/VIN.
∆VIN is the required input voltage ripple.
fSW is the operating switching frequency.
POUT is the out power, which is equal to VOUT x IOUT.
η is the efficiency.
The input capacitor must meet the ripple-current require-
ment imposed by the switching currents. The RMS input
ripple current is given by:
RMS OUT
I I D (1 D)= × ×−
The worst-case RMS current requirement occurs when
operating with D = 0.5. At this point, the above equation
simplifies to IRMS = 0.5 x IOUT.
For the MAXM17503 system (IN) supply, ceramic
capacitors are preferred due to their resilience to inrush
surge currents typical of systems, and due to their low
parasitic inductance that helps 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.
Figure 1. Adjustable Output Voltage
R
U
R
B
V
OUT
OUT
FB
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Table 1. Selection Component Values
VIN (V) VOUT (V) CIN COUT RU (kΩ) RB (kΩ) fSW (kHz) RT (kΩ)
4.5 to 15 0.9 3 x 2.2µF 1206 100V 2 x 100µF 1210 4V 35.7 OPEN 300 68.1
4.5 to 15 1 3 x 2.2µF 1206 100V 2 x 100 µF 1210 4V 35.7 324 300 68.1
4.5 to 15 1.2 3 x 2.2µF 1206 100V 1 x 100µF 1 x 47µF 1210 4V 41.2 124 350 57.6
4.5 to 15 1.5 3 x 2.2µF 1206 100V 1 x 100µF 1 x 47µF 1210 4V 57.6 86.6 350 57.6
4.5 to 15 1.8 3 x 2.2µF 1206 100V 1 x 100µF 1210 4V 61.9 61.9 350 57.6
4.5 to 15 2.5 3 x 2.2µF 1206 100V 1 x 100µF 1210 4V 53.6 30.1 400 49.9
4.5 to 15 3.3 2 x 2.2µF 1206 100V 1 x 47µF 1210 10V 130 48.7 500 OPEN
6.5 to 15 5 2 x 2.2µF 1206 100V 1 x 22µF 1210 10V 191 42.2 740 26.7
11 to 15 8 2 x 2.2µF 1206 100V 1 x 10µF 1210 16V 309 39.2 1200 15.8
4.5 to 28 0.9 3 x 2.2µF 1206 100V 3 x 100µF 1210 4V 35.7 OPEN 214 95.3
4.5 to 28 1 3 x 2.2µF 1206 100V 3 x 100µF 1210 4V 35.7 324 238 86.6
4.5 to 28 1.2 3 x 2.2µF 1206 100V 2 x 100µF 1210 4V 41.2 124 285 71.5
4.5 to 28 1.5 3 x 2.2µF 1206 100V 1 x 100µF 1 x 47µF 1210 4V 57.6 86.6 350 57.6
4.5 to 28 1.8 3 x 2.2µF 1206 100V 1 x 100µF 1210 4V 61.9 61.9 350 57.6
4.5 to 28 2.5 3 x 2.2µF 1206 100V 1 x 100µF 1210 4V 53.6 30.1 400 49.9
4.5 to 283.3 2 x 2.2µF 1206 100V 1 x 47µF 1210 10V 130 48.7 500 OPEN
6.5 to 28 5 2 x 2.2µF 1206 100V 1 x 22µF 1210 10V 191 42.2 740 26.7
11 to 28 8 2 x 2.2µF 1206 100V 1 x 10µF 1210 16V 309 39.2 1200 15.8
18.5 to
28 12 2 x 2.2µF 1206 100V 1 x 4.7µF 1210 16V 464 37.4 1800 10.0
4.5 to 40 1.2 3 x 2.2µF 1206 100V 2 x 100µF 1 x 47µF 1210 4V 41.2 124 200 100.00
4.5 to 40 1.5 3 x 2.2µF 1206 100V 1 x 100µF 1 x 47µF 1210 4V 57.6 86.6 250 82.5
4.5 to 40 1.8 3 x 2.2µF 1206 100V 1 x 100µF 1 x 47µF 1210 4V 61.9 61.9 300 68.1
4.5 to 40 2.5 3 x 2.2µF 1206 100V 1 x 100µF 1210 4V 53.6 30.1 400 49.90
4.5 to 40 3.3 2 x 2.2µF 1206 100V 1 x 47µF 1210 10V 130 48.7 500 OPEN
6.5 to 40 5 2 x 2.2µF 1206 100V 1 x 22µF 1210 10V 191 42.2 740 26.7
11 to 40 8 2 x 2.2µF 1206 100V 1 x 10µF 1210 16V 309 39.2 1200 15.8
18.5 to
40 12 2 x 2.2µF 1206 100V 1 x 4.7µF 1210 16V 464 37.4 1800 10.00
4.5 to 60 1.8 3 x 2.2µF 1206 100V 2 x 100µF 1210 4V 61.9 61.9 200 100.0
6 to 60 2.5 3 x 2.2µF 1206 100V 1 x 100µF 1210 4V 97.6 54.9 277 73.2
8 to 60 3.3 3 x 2.2µF 1206 100V 2 x 47µF 1210 10V 59 22.1 366 54.9
11 to 60 5 2 x 2.2µF 1206 100V 1 x 47µF 1210 10V 137 30.1 500 OPEN
17 to 60 8 2 x 2.2µF 1206 100V 1 x 10µF 1210 16V 309 39.2 888 21.5
25 to 60 12 2 x 2.2µF 1206 100V 1 x 4.7µF 1210 16V 464 37.4 1333 14.0
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Output Capacitor Selection
The X7R ceramic output capacitors are preferred due to
their stability over temperature in industrial applications.
The minimum recommended output capacitor values
in Table 1 are for desired output voltages to support
a dynamic step load of 50% of the maximum output
current in the application. For additional adjustable output
voltages, the output capacitance value is derived from the
following equation:
STEP RESPONSE
OUT
OUT
It
C2V
×
=×∆
C
0.33
RESPONSE f
SW
1
tf
≈+
where ISTEP is the step load transient, tRESPONSE is the
response time of the controller, ∆VOUT is the allowable
output ripple voltage during load transient, fC is the target
closed-loop crossover frequency, and fSW is the switching
frequency. Select fC to be 1/9th of fSW or 55kHz if the fSW
greater than 500kHz.
Loop Compensation
The MAXM17503 integrates the internal compensation
to stabilize the control loop. Only the device requires a
combination of output capacitors and feedback resistors
to program the closed-loop crossover frequency (fC)
at 1/9th of switching frequency. Use Table 1 to select
component values to compensate with appropriate operating
switching frequency. Connect a 0402 ceramic capacitor
from CF to FB to correct frequency response with switching
frequency below 500kHz. Place a 2.2pF capacitor for
switching frequency below 300kHz, 1.2pF for 300kHz to
400kHz switching frequency range.
Setting the Switching Frequency (RT)
The switching frequency range of 100kHz to 1.8MHz are
recommended from Table 1 for desired input and output
voltages. The switching frequency of MAXM17503 can be
programmed by using a single resistor (RRT) connected
from the RT pin to SGND. The calculation of RRT resistor
is given by the following equation:
RT
SW
21000
R 1.7
f
≈−
where RRT is in kΩ and fSW is in kHz. Leaving the RT
pin open to operate at the default switching frequency of
500kHz.
Soft-Start Capacitor Selection
The device implements an adjustable soft-start opera-
tion to reduce inrush current during startup. A capacitor
(CSS) connected from the SS pin to SGND to program the
soft-start time. The selected output capacitance (CSEL)
and the output voltage (VOUT) determine the minimum
value of CSS, as shown by the following equation:
CSS SEL x VOUT
where CSS is in nF and CSEL is in µF.
The value of the soft-start capacitor is calculated from the
desired soft-start time as follows:
SS
t
C
SS
5.55
≈
where tSS is in ms and CSS is in nF.
Detailed Description
The MAXM17503 is a complete step-down DC-DC power
supply that delivers up to 2.5A output current. The device
provides a programmable output voltage to regulate up
to 12V through external resistor dividers from an input
voltage range of 4.5V to 60V. The recommended input
voltage in Table 1 is selected highly enough to support
the desired output voltage and load current. The device
includes an adjustable frequency feature range from
100kHz to 1.8MHz to reduce sizes of input and output
capacitors. The Functional Diagram shows a complete
internal block diagram of the MAXM17503 power module.
Input Undervoltage-Lockout Level
The MAXM17503 contains an internal pullup resistor
(3.3MΩ) from EN to IN to have a default startup voltage.
The device offers an adjustable input undervoltage-
lockout level to set the voltage at which the device is
turned on by a single resistor connecting from EN/UVLO
to SGND as equation:
ENU
INU
3.3 1215
R(V 1.215)
×
≈−
where RENU is in kΩ and VINU is the voltage at which
the device is required to turn on the device. Ensure that
VINU is high enough to support the VOUT. See Table 1
to set the proper VINU voltage greater than or equal the
minimum input voltage for each desired output voltage.
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Mode Selection (MODE)
The MAXM17503 features a MODE pin to configure the
device operating in PWM, PFM, or DCM control schemes.
The device operates in PFM mode at light loads if the
MODE pin is open. If the MODE pin connects to ground,
the device operates in constant-frequency PWM mode
at all loads. The device operates in constant-frequency
DCM mode at light loads when the MODE pin connects
to VCC. State changes of the MODE operation are only at
power-up and ignore during normal operation.
PWM Mode Operation
In PWM mode, the step-down controller is switching
a constant-frequency at all loads with a minimum sink
current limit threshold (-1.8A typ) at light load. The
PWM mode of operation gives lower efficiency at light
loads compared to PFM and DCM modes of operation.
However, the PWM mode of operation is useful in applica-
tions sensitive to switching frequency.
PFM Mode Operation
In PFM mode, the controller forces the peak inductor
current in order to feed the light loads and maintain high
efficiency. If the load is lighter than the average PFM
value, the output voltage will exceed 102.3% of the feed-
back threshold and the controller enters into a hibernation
mode, turning off most of the internal blocks. The device
exits hibernation mode, and starts switching again, once
the output voltage is discharged to 101.1% of the feedback
threshold. The device then begins the process of delivering
pulses of energy to the output repeatedly until it reaches
102.3% of the feedback threshold. In this mode, the
behavior resembles PWM operation (with occasional pulse
skipping), where the inductor current does not need to
reach the light-load level.
PFM mode offers the advantage of increased efficiency
at light loads due to a lower quiescent current drawn from
the supply. However, the output-voltage ripple is also
increased as compared to the PWM or DCM modes of
operation, and the switching frequency is not constant at
light loads.
DCM Mode Operation
DCM mode features constant frequency operation down
to lighter loads than PFM mode, accomplished by not
skipping pulses. DCM efficiency performance lies between
the PWM and PFM modes.
External Frequency Synchronization (SYNC)
The device can be synchronized by an external clock
signal on the SYNC pin. The external synchronization
clock frequency must be between 1.1 x fSW and 1.4 x fSW,
where fSW is the frequency programmed by the RT
resistor. The minimum external clock high pulse width
and amplitude should be greater than 50ns and 2.1V
respectively. The minimum external clock low pulse width
should be greater than 160ns, and the maximum external
clock low pulse amplitude should be less than 0.8V. Table 1
provides recommended synchronous frequency ranges
for desired output voltages. Connect the SYNC pin to
SGND if it is not used.
RESET Output
The device includes a RESET comparator to monitor the
output for undervoltage and overvoltage conditions. The
open-drain RESET output requires an external pullup
resistor from 10kΩ to 100kΩ to V
CC
pin or maximum 6V
voltage source. RESET goes high impedance after the
regulator output increases above 95% of the designed
nominal regulated voltage. RESET goes low when the
regulator output voltage drops below 92% of the nominal
regulated voltage. RESET also goes low during thermal
shutdown.
Thermal Fault Protection
The MAXM17503 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.
Power Dissipation and Output-Current Derating
The MAXM17503 output current needs to be derated
if the device needs to be operated in a high ambient-
temperature environment. The amount of current-derating
depends upon the input voltage, output voltage, and
ambient temperature. The derating curves in TOC43
from the Typical Operating Characteristics section can be
used as guidelines. The curves are based on simulating
thermal resistance model (ψJT), measuring thermal
resistance (ψTA), and measuring power dissipation
(PDMAX) on the bench.
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The maximum allowable power losses can be calculated
using the following equation:
JA
JMAX A
DMAX
TT
P
−
=θ
where:
PDMAX is the maximum allowed power losses with maxi-
mum allowed junction temperature.
TJMAX is the maximum allowed junction temperature.
TA is operating ambient temperature.
θJA is the junction to ambient thermal resistance.
PCB Layout Guidelines
Careful PCB layout is critical to achieving low switching
losses and clean, stable operation.
Use the following guidelines for good PCB layout:
●Keep the input capacitors as close as possible to the
IN and PGND pins.
●Keep the output capacitors as close as possible to
the OUT and PGND pins.
●Keep the resistive feedback dividers as close as
possible to the FB pin.
●Connect all of the PGND connections to as large as
copper plane area as possible on the bottom layer.
●Connect EP1 to PGND and GND planes on bottom
layer.
●Use multiple vias to connect internal PGND planes
to the top layer PGND plane.
●Do not keep any solder mask on EP1, EP2, and EP3
on bottom layer. Keeping solder mask on exposed
pads decreases the heat dissipating capability.
●Keep the power traces and load connections short.
This practice is essential for high efciency.
Using thick copper PCBs (2oz vs. 1oz) can enhance
full-load efciency. Correctly routing PCB traces is
a difcult task that must be approached in terms of
fractions of centimeters, where a single milliohm of
excess trace resistance causes a measurable
efciency penalty.
Layout Recommendation
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PGND
OUT
SGND
OUT
1298
6
5
3
2
11
4
29 28 252627 2324
13 14 15
16
17
18
19
20
21
22
10
7
1
OUT
EP1
EP2
EP3
PGN
IN D
PGND
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
29 SiP L32915+1 21-0879 90-0459
PART TEMP RANGE MSL PIN-
PACKAGE
MAXM17503ALJ+T -40°C to +125°C 3 29 SiP
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Package Information
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.
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Chip Information
PROCESS: BiCMOS
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 11/14 Initial release —
1 4/15 Added application information to avoid potential latch-up issue on EN pin and added
MSL 3 rating 11, 18
2 11/16 Updated Package Thermal Characteristics and notes sections, updated Pin 4 in the
Pin Description section, and updated the Loop Compensation section 2, 11, 15
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 specications 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. © 2016 Maxim Integrated Products, Inc.
│
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MAXM17503 4.5V to 60V, 2.5A High-Efciency, DC-DC
Step-Down Power Module with Integrated Inductor
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.
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