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PDF ISL6119 Data sheet ( Hoja de datos )
| Número de pieza | ISL6119 | |
| Descripción | USB Dual Port Power Supply Controller | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ISL6119 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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TM
Data Sheet
ISL6119
May 2001
File Number 9002.2
USB Dual Port Power Supply Controller
The ISL6119 is a USB dual port power controller, fully
independent overcurrent (OC) fault protection IC.
Operational over the +2.5V to +5.5V range, this device
features internal current monitoring, accurate current
limiting, integrated power switches and current limited delay
to latch-off for system protection.
The ISL6119 current sense and limiting circuitry sets the
current limit to a nominal 1A, making this device well suited for
the USB port power management application. The ISL6119
provides OC fault notification, accurate current limiting and a
consistent timed latch-off thus isolating and protecting the
voltage bus in the presence of an OC event or short circuit. The
12ms time to latch-off is independent of the adjoining switch’s
electrical or thermal condition and the OC response time is
inversely related to the OC magnitude.
Each ISL6119 incorporates in a single 8 lead SOIC
package two 80mΩ N-channel MOSFET power switches for
power control. Each switch is driven by a constant current
source giving a controlled ramp up of the output voltage.
This provides a soft start turn-on eliminating bus voltage
drooping caused by inrush current while charging heavy
load capacitances. Independent enabling inputs and fault
reporting outputs for each channel are compatible with 3V
and 5V logic to allow external control and monitoring.
The ISL6119 undervoltage lockout feature prevents turn-on
of the outputs unless the correct ENABLE state and VIN >
2.5V are present. During initial turn-on the ISL6119
prevents fault reporting by blanking the fault signal. Rising
and falling outputs are current limited voltage ramps so that
both the inrush current and voltage slew rate are limited,
independent of load. This reduces supply droop due to
surge and eliminates the need for external EMI filters.
During operation, once an OC condition is detected the
appropriate output is current limited for 12ms to allow
transient conditions to pass. If still in current limit after the
current limit period has elapsed, the output is then latched
off and the fault is reported by pulling the corresponding
FAULT low. The FAULT signal is latched low until reset by
the ENABLE signal being de-asserted at which time the
FAULT signal will clear.
Features
• 80mΩ Integrated Power N-channel MOSFET Switches
• Accurate Current Sensing and 1A Current Limiting
• 12ms Fault Delay to Latch-Off, No Thermal Dependency
• 2.5V to 5.5V Operating Range
• Disabled Output Internally Pulled Low
• Undervoltage Lockout
• Controlled Turn-on Ramp Time
• Channel Independent Fault Output Signals
• Compatible with 3.3V and 5V Logic Families
• Channel Independent Logic Level Enable High Inputs
(ISL6119H) or Enable Low Inputs (ISL6119L)
Applications
• USB Port Power Management
• Electronic Circuit Limiting and Breaker
Ordering Information
PART
NUMBER
ISL6119LIB
ISL6119LIB-T
ISL6119HIB
ISL6119HIB-T
TEMP.
RANGE
(oC)
PACKAGE
PKG. NO.
-40 to 85 8 Lead SOIC
M8.15
-40 to 85 8 Lead SOIC Tape & Reel
-40 to 85 8 Lead SOIC
M8.15
-40 to 85 8 Lead SOIC Tape & Reel
ISL6119EVAL1
Evaluation Platform
ISL6119USBEVAL1 USB Dual Port Evaluation Platform
Pinout
ISL6119 (SOIC)
TOP VIEW
GND 1
VIN 2
ENABLE_1 3
ENABLE_2 4
8 FAULT_1
7 OUT_1
6 OUT_2
5 FAULT_2
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2001, All Rights Reserved
1 page  
ISL6119
Introduction
The ISL6119 is a fully independent dual channel overcurrent
(OC) fault protection IC for the +2.5V to +5.5V environment.
Each ISL6119 incorporates in a single 8 lead SOIC package
two 80mW N-channel MOSFET power switches for power
control. Independent enabling inputs and fault reporting outputs
compatible with 3V and 5V logic allows for external control and
monitoring. This device features internal current monitoring,
accurate current limiting, integrated power switches and current
limited timed delay to latch-off for system protection. See Figure
1 for typical operational waveforms including both under and
over current situations.
Key Feature Description and Operation
UV Lock Out
The ISL6119 undervoltage lockout feature prevents
functionality of the device unless the correct ENABLE state and
VIN > 2.5V are present.
Soft Start
A constant 500nA current source ramps up the switch’s gate
causing a voltage follower effect on the output voltage. This
provides a soft start turn-on eliminating bus voltage drooping
caused by in-rush current charging heavy load capacitances.
Rising and falling outputs are current limited voltage ramps so
that both the inrush current and voltage slew rate are limited,
independent of load. This reduces supply droop due to surge
and also eliminates the need for EMI filters necessary on other
IC products.
Fault Blanking On Start-Up
During initial turn-on the ISL6119 prevents nuisance faults
being reported to the system controller by blanking the fault
signal for 12ms. This blanking eliminates the need for
external RC filters necessary for other vendor products that
assert a fault signal upon initial turn-on into a temporary high
current condition. See Figures 10 through 12 for waveform
examples.
Current Regulation
The ISL6119 has integrated current sensing on the power
MOSFET that allows for rapid control of OC events. Once an
OC is detected the ISL6119 goes into its current regulation
(CR) control mode. The ISL6119 CR level is set to a nominal
1A. This current regulation is ±25% over the full operating
temperature and voltage bias range. See Figures 4 and 5 for
illustrative curves. The speed of this control is inversely
related to the magnitude of the OC fault. Thus a hard over
current is more quickly controlled than a marginal OC
condition. See Figure 6 for waveforms illustrating this and
Figure 7 for an accompanying graph.
Over Temperature Shutdown
Although the ISL6119 has a thermal shutdown feature,
because of the 12ms timed shutdown this will only be
invoked in extremely high ambient temperatures
Latch-Off Time Delay
The primary function of any OC protection device is to
quickly isolate the voltage bus from a faulty load. Unlike
many other IC products that sense the IC thermal condition
(the monitored IC junction temperature depends on a
number of factors the most important of which are power
dissipation of the faulted and adjacent switches and package
temp) to isolate a faulty load, the ISL6119 uses an internal
12ms timer that starts upon OC detection. Once an OC
condition is detected the appropriate output is current limited
for a maximum of 12ms to allow transient conditions to pass
before latch-off. This time to latch-off is independent of
device thermal or adjacent switch condition. See Figure 18
for waveforms illustrating independent latch-off.
If, after the ISL6119 has latched off, and the fault has
asserted and, the enable is not deasserted but the OC
condition still exists, the ISL6119 unlike other IC devices
does not send to the controller a continuous string of fault
pulses. The ISL6119’s single fault signal is sent at the time of
latch-off unlike other devices.
Slow And Fast Shutdown
The ISL6119 has two shutdown modes. When turned off
with a load current less than the current regulation (CR) level
the ISL6119 shuts down in a controlled manner using a
500nA constant current source controlled ramp. When
latched off due to CR and the timer has expired, the ISL6119
quickly pulls down the output thereby quickly removing the
faulted load from the voltage bus. See Figures 8 and 9 for
waveforms of each mode.
Active Output Pulldown
Another unique ISL6119 feature is the active pull down on
the outputs to 300mV above GND when the device is
disabled. Competitors’ parts’ switch leakage causes the
output voltage to drift up to VIN voltage even when the part is
supposed to be disabled.
ON OFF
ENABLE
FAULT
VOUT
LATCH-OFF SET
RESET BY
ENABLE
CURRENT
REGULATION
SETTLING TIME
(1.4ms)
OVER CURRENT
IOUT
1A CURRENT
LIMIT
12ms CURRENT REGULATION PERIOD
FIGURE 1. TYPICAL OPERATIONAL WAVEFORMS
5
5 Page 
ISL6119
ISL6119USBEVAL1
VIN
C1
1
FAULT_OUT 8
R1
R2
2 VIN
3 EN
ISL6119
OUT 7
OUT 6
4 EN
FAULT_OUT 5
C3
C2
L1 L3
1 23 4 1 23 4
L2
L4
CON1
FIGURE 20. ISL6119USBEVAL BOARD
COMPONENT
DESIGNATOR
COMPONENT NAME
ISL6119USBEVAL1
DUT1
ISL6119L
C1 Chip Decoupling Capacitor
C2 - C3
V+ Decoupling Capacitors
L1 - L4
V+ And GND Stability Inductors
CON1
Dual Stacked USB Type A Connector
R1 - R2
Pull-Up Resistors
TABLE 4.
COMPONENT DESCRIPTION
Intersil, ISL6119L 5V USB HotPlug Controller
0.1µF, 0805
100µF 16V Electrolytic, Radial Lead
220nH, 0805 (OPTIONAL FOR IMPLEMENTATION)
ASSMANN, AU-Y1008 or Equiv
1.2Ωk, 0805
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ISL6119.PDF ] | |
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