1
FN9002.3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL6119
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 80m
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
80m
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)
Pb-Free Package Options
Available in Tape & Reel with `-T' Part Number Suffix
Applications
USB Port Power Management
Electronic Circuit Limiting and Breaker
Pinout
ISL6119 (SOIC)
TOP VIEW
Ordering Information
PART
NUMBER
TEMP.
RANGE (C)
PACKAGE
PKG.
DWG. #
ISL6119LIB
-40 to 85
8 Lead SOIC
M8.15
ISL6119LIBZA
(Note)
-40 to 85
8 Lead SOIC (Pb-free) M8.15
ISL6119HIB
-40 to 85
8 Lead SOIC
M8.15
ISL6119HIBZA
(Note)
-40 to 85
8 Lead SOIC (Pb-free) M8.15
ISL6119EVAL1
Evaluation Platform
ISL6119USBEVAL1 USB Dual Port Evaluation Platform
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is 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-020B.
1
2
3
4
8
7
6
5
VIN
OUT_1
OUT_2
FAULT_1
FAULT_2
GND
ENABLE_1
ENABLE_2
Data Sheet
March 2004
2
Typical Application: Dual USB Port Power
Simplified Block Diagram
D+
D-
D+
D-
+5V
VIN
ENABLE_2
FAULT_1
ENABLE_1
FAULT_2
GND
OUT_1
OUT_2
V+
V+
USB
PORT 1
USB
PORT_2
U
S
B
C
O
N
T
R
O
L
L
E
R
ISL6119L
GND
VIN
EN_1
EN_2
FAULT_2
OUT_2
OUT_1
FAULT_1
Q-PUMP
CURRENT AND TEMP.
POR
CHANNEL 1 LIKE CHANNEL 2
MONITORING, GATE AND
OUTPUT CONTROL
LOGIC
ISL6119
3
Pin Descriptions
PIN NO.
DESIGNATOR
FUNCTION
DESCRIPTION
1
GND
IC Reference
2
VIN
Chip bias, Controlled
Supply Input,
Undervoltage lock-out
VIN provides chip bias voltage. At VIN < 2.5V chip functionality is disabled, FAULT latch
is cleared and floating and OUT is held low.
3, 4
ENABLE_1, 2/
ENABLE_1, 2
Channel Enable/
Enable Not Inputs
Enables/Disables switch.
5, 8
FAULT_2, 1
Channel 2, 1 Over
Current Fault Not
Indicator
Channel overcurrent fault indicator. FAULT floats and is disabled until VIN >2.5V. This
output is pulled low after the OC timeout period has expired and stays latched until
ENABLE is deasserted.
6, 7
OUT_2, 1
Channel 2,1 Controlled
Supply Output
Channel voltage output, connect to load to protect. Upon an OC condition I
OUT
is
current limited to 1A. Current limit response time is within 200
s. This output will remain
in current limit for a nominal 12ms before being latched off.
ISL6119
4
Absolute Maximum Ratings
Thermal Information
Supply Voltage (VIN to GND). . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0V
EN, FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to VIN 0.3V
Output Current . . . . . . . . . . . . . . . . . . . . . . .Short Circuit Protected
ESD Rating
Human Body Model (Per MIL-STD-883 Method 3015.7) . . . . 3KV
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . .-40C to 85C
Supply Voltage Range (Typical). . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Thermal Resistance (Typical, Note 1)
JA
(C/W)
8 Lead SOIC Package . . . . . . . . . . . . . . . . . . . . . . .
96
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150C
Maximum Storage Temperature Range . . . . . . . . . . . -65C to 150C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300C
(SOIC - Lead Tips Only)
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.
NOTES:
1.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
2. All voltages are relative to GND, unless otherwise specified.
Electrical Specifications
Supply Voltages = 5V, T
A
= T
J
= -40 to 85C, Unless Otherwise Specified
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
POWER SWITCH
ISL6119 On Resistance at 2.7V
r
DS(ON)_27
VIN = 2.7V I
OUT
= 0.7A T
A
= T
J
= 25C
-
90
105
m
T
A
= T
J
= 85C
-
115
130
m
ISL6119 On Resistance at 3.3V
r
DS(ON)_33
VIN = 3.3V, I
OUT
= 0.7A T
A
= T
J
= 25C
-
80
100
m
T
A
= T
J
= 85C
-
115
130
m
ISL6119 On Resistance at 5.0V
r
DS(ON)_50
VIN = 5V, I
OUT
= 0.7A T
A
= T
J
= 25C
-
80
95
m
T
A
= T
J
= 85C
-
115
130
m
Disabled Output Voltage
V
OUT_DIS
VIN = 5V, Switch Disabled, 50
A Load
-
300
450
mV
Vout Rising Rate
t_vout_rt
R
L
= 10
, C
L
= 0.1
F, 10%-90%
-
10
-
V/ms
Slow Vout Turn-off Rate
t_svout_offt
R
L
= 10
, C
L
= 0.1
F, 90%-10%
-
10
-
V/ms
Fast Vout Turn-off Rate
t_fvout_offt
R
L
= 1
, C
L
= 0.1
F, 90%-10%
-
4
-
V/
s
CURRENT CONTROL
Current Limit, VIN = 3.3V - 5V
Ilim
Vout = 0.8V
0.75
1
1.25
A
OC Regulation Settling Time
tsett
Ilim
R
L
= 5
, C
L
= 0.1
F to Within 10% of CR
-
2
-
ms
Severe OC Regulation Settling Time
tsett
Ilim_sev
R
L
< 1
, C
L
= 0.1
F to Within 10% of CR
-
100
-
s
Over Current Latch-off Time
t
OC_loff
ISL6119X, Tj = +25C
-
10
-
ms
I/O PARAMETERS
Fault Output Voltage
Vfault_hi
Fault I
OUT
= 10mA
-
-
0.4
V
ENABLE High Threshold
Ven_vih
VIN = 5.5V
2.0
-
-
V
ENABLE Low Threshold at 2.7V
Ven_vil
VIN = 2.7V
-
-
0.6
V
ENABLE Low Threshold at 5.5V
Ven_vil
VIN = 5.5V
-
-
0.8
V
ENABLE Input Current
Ien_i
ENABLE = 0V to 5V, VIN = 5V, T
J
> 25C
-0.5
-
0.5
A
BIAS PARAMETERS
Enabled VIN Current
I
VDD
Switches Closed, OUTPUT = OPEN, T
J
> 0C
-
120
200
A
Disabled VIN Current
I
VDD
Switches Open, OUTPUT = OPEN
-
1
5
A
Undervoltage Lockout Threshold
V
UVLO
VIN Rising, Switch Enabled
1.7
2.25
2.5
V
UV Hysteresis
UV
HYS
50
100
-
mV
Over Temperature Disable
Temp_dis
-
150
-
C
ISL6119
5
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 overcurrent 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
overcurrent 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.
OFF
ON
FAULT
LATCH-OFF SET
RESET BY
ENABLE
VOUT
CURRENT
REGULATION
SETTLING TIME
(1.4ms)
OVER CURRENT
12ms CURRENT REGULATION PERIOD
1A CURRENT
LIMIT
ENABLE
IOUT
FIGURE 1. TYPICAL OPERATIONAL WAVEFORMS
ISL6119
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