The MAX16550 protection IC contains integrated low-resistance MOSFETs and lossless current-sensing circuitry with SMBus/PMBus™ control and reporting. The IC is designed to provide optimal solutions for power distribution, control, monitoring and protection of the system's 12V power supply. An internal LDO provides the bias supply voltage for the protection IC. If no fault is detected, the IC starts to start up and is designed to provide a controlled, monotonic start-up. Programmable soft-start ramp and delay are provided to limit inrush current during startup. The IC senses the current and voltage of the 12V system power rail and provides multi-level protection with rapid shutdown when a fault is detected. Maxim's patented lossless current detection detects current changes with load and temperature with high accuracy, improving the overall energy efficiency of the system and reducing power consumption. The output voltage is monitored at all times. If at any time the output voltage drops below the programmable output undervoltage lockout threshold, the PWRGD signal asserts low. If at any time the input voltage drops below the programmable input undervoltage lockout threshold, the PWRGD signal asserts low. The IC can be configured to provide input overvoltage protection via PMBus. Input overvoltage protection is disabled by default. When enabled via PMBus, if the input voltage exceeds the programmable overvoltage threshold, the MOSFET latches and issues a fault indication.
SMBUS_ID ...........................................................-0.3V to +2.5V
Absolute Maximum Ratings
(Note 1)
Operating Ratings
Supply Voltage (V
IN
) ........................................... 10.8V to 13.2V
Bias Supply Voltage (V
DD
) .................................. 1.76V to 1.94V
Junction Temperature (T
J
)....................................0°C to +125°C
Package Thermal Characteristics
Junction-to-Case Thermal Resistance (θ
JC
, max) .......0.31°C/W
Note 1:
These products are completely Halogen-free and Pb-free, employing special materials sets: molding compounds/die attach materials and
100% matte tin plate including anneal. These products are RoHS compliant with an -e3 termination finish and are compatible with both
SnPb and Pb-free soldering operations. These products are MSL classified at peak reflow temperatures that meet JEDEC JSTD-020.
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: 18 FCQFN
Package Code
Outline Number
Land Pattern Number
THERMAL RESISTANCE
Junction to Case (θ
JC
)
0.31°C/W
P184A4F+1
21-1080
90-0529
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.
www.maximintegrated.com
Maxim Integrated
│
3
MAX16550
Integrated Protection IC on 12V Bus with an
Integrated MOSFET, Lossless Current Sensing,
and PMBus Interface
(V
IN
= 12V ±10%, unless otherwise noted. T
J
= 0°C to +125°C, unless otherwise noted. Specifications are 100% production tested at
T
A
= +32°C. Limits over operating temperature range are guaranteed by design and characterization.)
PARAMETER
12V SUPPLY (V
IN
)
Supply Voltage Range
Device Supply Current
INTEGRATED 1.8V LINEAR REGULATOR
LDO Output Voltage Range
V
DD
Falling
V
DD
Rising
Hysteresis
V
DD
UVLO Response Time
UNDERVOLTAGE LOCKOUT: 12V SUPPLY (V
IN
)
V
IN
_UVLO Rising Threshold
V
IN
_UVLO Hysteresis
Programmable 12V V
IN
Undervoltage
Threshold for Rising Input
Response Time
EN_UVLO PIN INTERNAL PARAMETERS
EN_UVLO Pin Leakage
EN_UVLO Internal Pulldown Resistor
BOOST VOLTAGE (V
BST
)
V
BST
Charging Time to 1.6V Above
V
OUT
BST Voltage Above V
OUT
Rising UVLO Threshold Above V
OUT
Falling UVLO Threshold Above V
OUT
UVLO Hysteresis
Falling Lockout Response Time
On-Resistance
t
D
R
DS(ON)
(Note 2)
INTEGRATED MOSFET CHARACTERISTICS
1.9
mΩ
BOOST UVLO
t
CHARGE
V
BST
(Note 2)
(Note 2)
(Note 2)
0.8
0.74
60
C
BST
= 100nF
150
1.8
1.2
1.1
130
1.5
1.6
V
1.5
400
mV
µs
µs
V
EN_UVLO = 1.8V
5
110
6.7
250
11
450
µA
kΩ
V
IN_UVLO
V
IN_UVLO
t
D
At EN/UVLO pin
Programmable through resistor-
divider, measured at V
IN
From EN/UVLO = 0V to FET off
0.95
1
50
8
2
1.05
V
mV
V
µs
V
DD
(Note 2)
(Note 2)
(Note 2)
(Note 2)
1.76
1.55
1.62
30
1.85
1.6
1.67
60
2
1.94
1.7
1.73
80
mV
µs
V
V
IN
FET off
I
IN
FET on: I
OUT
= 0 (Note 2)
FET on: I
OUT
= 30A (Note 2)
10.8
3.0
3.7
12
13.2
6.25
6.75
10
mA
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Electrical Characteristics
www.maximintegrated.com
Maxim Integrated
│
4
MAX16550
Integrated Protection IC on 12V Bus with an
Integrated MOSFET, Lossless Current Sensing,
and PMBus Interface
(V
IN
= 12V ±10%, unless otherwise noted. T
J
= 0°C to +125°C, unless otherwise noted. Specifications are 100% production tested at
T
A
= +32°C. Limits over operating temperature range are guaranteed by design and characterization.)
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