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PDF ISL6144 Data sheet ( Hoja de datos )
| Número de pieza | ISL6144 | |
| Descripción | High Voltage ORing MOSFET Controller | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
February 15, 2007
ISL6144
FN9131.3
High Voltage ORing MOSFET Controller
The ISL6144 ORing MOSFET Controller and a suitably sized
N-Channel power MOSFET(s) increases power distribution
efficiency and availability when replacing a power ORing diode
in high current applications.
In a multiple supply, fault tolerant, redundant power distribution
system, paralleled similar power supplies contribute equally to
the load current through various power sharing schemes.
Regardless of the scheme, a common design practice is to
include discrete ORing power diodes to protect against reverse
current flow should one of the power supplies develop a
catastrophic output short to ground. In addition, reverse current
can occur if the current sharing scheme fails and an individual
power supply voltage falls significantly below the others.
Although the discrete ORing diode solution has been used for
some time and is inexpensive to implement, it has some
drawbacks. The primary downside is the increased power
dissipation loss in the ORing diodes as power requirements for
systems increase. Another disadvantage when using an ORing
diode would be failure to detect a shorted or open ORing diode,
jeopardizing power system reliability. An open diode reduces
the system to single point of failure while a diode short might
pose a hazard to technical personnel servicing the system
while unaware of this failure.
The ISL6144 can be used in 10V to 75V systems having similar
power sources and has an internal charge pump to provide a
floating gate drive for the N-Channel ORing MOSFET. The High
Speed (HS) Comparator protects the common bus from
individual power supply shorts by turning off the shorted feed’s
ORing MOSFET in less than 300ns and ensuring low reverse
current.
An external resistor-programmable detection level for the HS
Comparator allows users to set the N-Channel MOSFET
“VOUT - VIN” trip point to adjust control sensitivity to power
supply noise.
The Hysteretic Regulating (HR) Amplifier provides a slow turn-
off of the ORing MOSFET. This turn-off is achieved in less than
100μs when one of the sourcing power supplies is shutdown
slowly for system diagnostics, ensuring zero reverse current.
This slow turn-off mechanism also reacts to output voltage
droop, degradation, or power-down.
An open drain FAULT pin will indicate that a fault has occurred.
The fault detection circuitry covers different types of failures;
including dead short in the sourcing supply, a short of any two
ORing MOSFET terminals, or a blown fuse in the power
distribution path.
Features
• Wide Supply Voltage Range +10V to +75V
• Transient Rating to +100V
• Reverse Current Fault Isolation
• Internal Charge Pump Allows the use of N-Channel
MOSFET
• HS Comparator Provides Very Fast <0.3µs Response
Time to Dead Shorts on Sourcing Supply. HS Comparator
also has Resistor-adjustable Trip Level
• HR Amplifier allows Quiet, <100µs MOSFET Turn-off for
Power Supply Slow Shut Down
• Open Drain, Active Low Fault Output with 120µs Delay
• Provided in Packages Compliant to UL60950 (UL1950)
Creepage Requirements
• QFN Package:
- Compliant to JEDEC PUB95 MO-220
QFN - Quad Flat No Leads - Package Outline
- Near Chip Scale Package footprint, which improves
PCB efficiency and has a thinner profile
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• ORing MOSFET Control in Power Distribution Systems
• N + 1 Redundant Distributed Power Systems
• File and Network Servers (12V and 48V)
• Telecom/Datacom Systems
Ordering Information
PART
PART
NUMBER MARKING
TEMP.
RANGE
(°C)
PKG.
PACKAGE DWG. #
ISL6144IV* ISL61 44IV -40 to +105 16 Ld TSSOP M16.173
ISL6144IVZA* ISL61 44IVZ -40 to +105 16 Ld TSSOP M16.173
(See Note)
(Pb-Free)
ISL6144IR* ISL 6144IR -40 to +105 20 Ld 5x5 QFN L20.5x5
ISL6144IRZA* ISL6144 IRZ -40 to +105 20 Ld 5x5 QFN L20.5x5
(See Note)
(Pb-Free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
*Add “-T” suffix for tape and reel.
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004, 2006-2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL6144
Absolute Maximum Ratings TA = +25°C
VIN, VOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +100V
GATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VIN +12V
HVREF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VIN -5V
COMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VOUT
VSET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VOUT -5V
FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 16V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Thermal Information
Thermal Resistance (Typical, Note 1)
θJA (°C/W) θJC (°C/W)
TSSOP Package (Note 1) . . . . . . . . . .
90
N/A
QFN Package (Notes 3, 4). . . . . . . . . .
35
5
Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . +300°C
Operating Conditions
Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . +10 to +75V
Temperature Range (TA) . . . . . . . . . . . . . . . . . . . . -40°C to +105°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
+150°C max junction temperature is intended for short periods of time to prevent shortening the lifetime. Operation close to +150°C junction may trigger the shutdown of
the device even before +150°C, since this number is specified as typical.
NOTES:
1. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. (See Tech Brief, #TB379.1 for
details.)
2. All voltages are relative to GND, unless otherwise specified.
3. For θJC, the "case temp" location is the center of the exposed metal pad on the package underside.
4. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “die attach” features. (See Tech
Brief, #TB379 for details.)
Electrical Specifications VIN = 48V, TA = -40°C to +105°C, Unless Otherwise Specified
PARAMETER
SYMBOL
TEST CONDITIONS
BIAS “VIN”
POR Rising
12V Bias Current
48V Bias Current
75V Bias Current
GATE
PORL2H
I12V
I48V
I75V
VIN Rising to VGATE > VIN + 7.5V
VIN = 12V, VGATE = VIN + VGQP
VIN = 48V, VGATE = VIN + VGQP
VIN = 75V, VGATE = VIN + VGQP
Charge Pump Voltage
Gate Low Voltage Level
Low Pull Down Current
High Pull Down Current
VGQP
VGL
IPDL†
(Note 5)
IPDH†
(Note 5)
VIN = 12V to 75V
VIN - VOUT < 0V
Cgs = 39nF, IPDL = Cgs * dVgs/Ttofs
Cgs = 39nF, IPDH = Cgs * dVgs/Ttoff
Slow Turn-off Time
Fast Turn-off Time
ttoffs
ttoff
Cgs = 39nF
Turn-off from VGATE = VIN + VGQP to VIN + 1V with
Cgs = 39nF (includes HS Comparator delay time)
Start-up “Turn-On” Time
GATE Turn-On Current
tON
ION†
(Note 5)
Turn-on from VGATE = VIN to VIN + 7.5V into 39nF
VIN = 10V to 75V
CONTROL AND REGULATION I/O
HR Amplifier Forward Voltage
Regulation
HS COMP Externally
Programmable Threshold
VFWD_HR
VTH(HS)†
(Note 5)
ISL6144 controls voltage across FET Vds to
VFWD_HR during static forward operation at loads
resulting in I * rDS(ON) < VFWD_HR
Externally programmable threshold for noise
sensitivity (system dependent), typical 0.05 to 0.3V
HS Comparator Offset Voltage
VOS(HS)
MIN TYP MAX UNITS
10 -
- 3.5
- 4.5
-5
-V
- mA
- mA
- mA
VIN + 9 VIN + 10.5 VIN + 12
-0.3 VIN VIN + 0.5
-5 -
V
V
mA
- 2 -A
- - 100 µs
- 250 300 ns
- 1 - ms
- 1 - mA
10 20 30 mV
0 0.05 5.3 V
-40 0
25 mV
5 FN9131.3
February 15, 2007
5 Page 
ISL6144
Typical Performance Curves and Waveforms (Continued)
6.000
5.875
5.750
5.625
75V
48V
10V AND 12V
5.500
5.375
5.250
-40 -20
0 20 40 60 80
TEMPERATURE (°C)
100 120
HVREF(VZ)
1V/DIV
10V/DIV
VG VIN 10V/DIV
IIN
10A/DIV
FIGURE 9. HVREF VOLTAGE
FIGURE 10. FIRST SUPPLY START-UP
rDS(ON) = 19mΩ, QTOT = 70nC,
EXTERNAL CGS = 33nF, VTH(HS) = 55mV
IIN2
VOUT
5A/DIV
VIN2
10V/DIV
VGS2
10V/DIV
5V/DIV
rDS(ON) = 19mΩ, QTOT = 70nC,
EXTERNAL CGS = 33nF, VTH(HS) = 55mV
IIN2
VOUT
VIN2
VGS2
5A/DIV
10V/DIV
10V/DIV
5V/DIV
FIGURE 11. HIGH SPEED TURN-OFF, VIN = 48V, COMMON
LOAD IS SMPS (CLOAD = 100µF) WITH
EQUIVALENT 4A LOAD
FIGURE 12. HIGH SPEED TURN-OFF, VIN = 48V, COMMON
LOAD IS SMPS (CLOAD = 100µF) WITH
EQUIVALENT 1.3A LOAD
11 FN9131.3
February 15, 2007
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet ISL6144.PDF ] | |
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