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.
●
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 Profile 9mm x 15mm x 2.8mm SiP Package
•
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 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
Benefits and Features
Typical Application Circuit
EN
4.5V TO 60V
V
IN
C
IN
V
CC
IN
SYNC
MODE
RT
R
T
Applications
●
●
●
●
●
Industrial Power Supplies
Distributed Supply Regulation
FPGA and DSP Point-of-Load Regulator
Base Station Point-of-Load Regulator
HVAC and Building Control
OUT
OUT
OUT
OPTIONAL
V
CC
OUT
V
OUT
RESET
MAXM17503
OUT
OUT
OUT
C
OUT
SS
C
SS
R
U
EP3
FB
CF
EP1
SGND
PGND
PGND
R
B
Ordering Information
appears at end of data sheet.
19-7451; Rev 2; 11/16
MAXM17503
4.5V to 60V, 2.5A High-Efficiency, DC-DC
Step-Down Power Module with Integrated Inductor
IN to PGND (Note 2) .............................................-0.3V to +65V
EN to SGND (Note 2) ............................................-0.3V to +65V
V
CC
.............................................-0.3V to min (V
IN
+ 0.3V, 6.5V)
FB,
RESET,
SS, CF, MODE,
SYNC, RT to SGND .........................................-0.3V to +6.5V
OUT to PGND (V
IN
< 25V).........................-0.3V to (V
IN
+ 0.3V)
OUT to PGND (V
IN
≥ 25V)
....................................-0.3V to +25V
LX to PGND................................................-0.3V to (V
IN
+ 0.3V)
Absolute Maximum Ratings (Notes 1, 2)
BST to PGND ........................................................-0.3V to +70V
BST to V
CC
...........................................................-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
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)
Junction-to-Ambient Thermal Resistance (θ
JA
) ...........30.8°C/W
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#.
Electrical Characteristics
(V
IN
= V
EN
= 24V, R
RT
= 40.2kΩ (500kHz) to SGND, V
PGND
= V
MODE
= V
SYNC
= V
SGND
= 0V, V
CC
= LX = SS =
RESET
= OUT = open,
V
BST
to V
LX
= 5V, V
FB
= 1V, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C. All voltages are
referenced to SGND, unless otherwise noted.) (Note 4)
PARAMETER
INPUT SUPPLY (V
IN
)
IN Input Voltage Range
Input Shutdown Current
V
IN
I
IN_SH
I
Q_PFM_HIB
SYMBOL
CONDITIONS
MIN
4.5
TYP
MAX
60
UNITS
V
μA
μA
V
EN
= 0V
MODE = RT = open
MODE = V
CC
Normal switching mode, no load
V
EN
rising
V
EN
falling
Pullup resistor between IN and EN pins
6V < V
IN
< 60V, 1mA < I
VCC
< 25mA
V
IN
= 6V, V
CC
= 4.3V
V
IN
= 4.5V, I
VCC
= 20mA
V
CC
rising
V
CC
falling
V
IN
= 6.5V to 60V, V
OUT
= 5V
Tested with I
OUT
= 0A and 1A
1.192
1.068
3.15
4.75
26.5
4.2
4.05
3.65
10.5
125
1.16
9.5
1.215
1.09
3.3
5
60
4.2
3.8
0.1
1
13
Input Quiescent Current
I
Q_DCM
I
Q_PWM
1.8
mA
mA
LOGIC INPUTS
EN Threshold
Enable Pullup Resistor
LDO
V
CC
Output Voltage Range
V
CC
Current Limit
V
CC
Dropout
V
CC
UVLO
OUTPUT SPECIFICATIONS
Line Regulation Accuracy
Load Regulation Accuracy
mV/V
mV/A
V
CC
I
VCC_MAX
V
CC_DO
V
CC_UVR
V
CC_UVF
5.25
100
4.3
3.9
V
mA
V
V
V
ENR
V
ENF
R
ENP
1.26
1.131
3.45
V
MΩ
www.maximintegrated.com
Maxim Integrated
│
2
MAXM17503
4.5V to 60V, 2.5A High-Efficiency, DC-DC
Step-Down Power Module with Integrated Inductor
(V
IN
= V
EN
= 24V, R
RT
= 40.2kΩ (500kHz) to SGND, V
PGND
= V
MODE
= V
SYNC
= V
SGND
= 0V, V
CC
= LX = SS =
RESET
= OUT = open,
V
BST
to V
LX
= 5V, V
FB
= 1V, T
A
= T
J
= -40°C to +125ºC, unless otherwise noted. Typical values are at T
A
= +25ºC. All voltages are
referenced to SGND, unless otherwise noted.) (Note 4)
PARAMETER
FB Regulation Voltage
FB Input Bias Current
FB Undervoltage Trip Level to
Cause Hiccup
Hiccup Timeout
SOFT-START (SS)
Charging Current
RT AND SYNC
R
RT
= 210kΩ
Switching Frequency
f
SW
R
RT
= 9.76kΩ
R
RT
= open
SYNC Frequency Range
SYNC Pulse Width
SYNC Threshold
MODE
V
M_DCM
MODE Threshold
CURRENT LIMIT
Average Current-Limit Threshold
RESET
RESET
Output Level Low
RESET
Output Leakage Current
FB Threshold for
RESET
Assertion
FB Threshold for
RESET
Deassertion
RESET
Deassertion Delay After
FB Reaches 95% Regulation
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
Thermal-Shutdown Hysteresis
Temperature rising
+165
10
°C
°C
V
FB_OKF
V
FB_OKR
I
AVG_LIMIT
V
OUT
= V
FB
= 0.8V, f
SW
= 200kHz
I
RESET
= 10mA
V
RESET
= 5.5V, T
A
= T
J
= +25°C
V
FB
falling
V
FB
rising
-0.1
90.5
93.8
92
95
1024
3.45
0.4
+0.1
94.6
97.8
A
V
µA
%
%
Cycles
V
M_PFM
V
M_PWM
MODE = V
CC
(DCM mode)
MODE = open (PFM mode)
MODE = GND (PWM mode)
V
CC
- 1.6
V
CC
/2
1.4
V
V
IH
V
IL
450
1.1x
f
SW
50
2.1
0.8
90
100
1800
500
550
1.4x
f
SW
kHz
ns
V
110
kHz
I
SS
V
SS
= 0.5V
4.7
5
5.3
μA
SYMBOL
V
FB_REG
I
FB
V
FB_HICF
CONDITIONS
MODE = SGND
MODE = open
0V <
V
FB
< 1V, T
A
= +25°C
MIN
0.887
0.890
-50
0.56
0.58
32,768
0.915
TYP
MAX
0.910
0.936
+50
0.65
UNITS
V
nA
V
Cycles
Electrical Characteristics (continued)
Note 4:
All limits are 100% tested at T
A
= +25°C. Maximum and minimum limits are guaranteed by design and characterized over
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