19-3449; Rev 0; 11/04
Single 1.2A USB Switch in
3mm x 3mm TDFN
General Description
The MAX8586 single current-limited switch controls up to
1.2A to power USB applications and has multiple protec-
tion features including thermal shutdown, internal current
limiting, and reverse current protection. The thermal shut-
down limits junction temperature during a prolonged
short or overload condition. The internal current-limiting
circuitry protects the input supply against overload and
is programmable using an external resistor. The
MAX8586 meets all IEC specifications for USB ports.
The IC latches off when the output experiences a short
circuit for more than 20ms, saving system power. Auto-
restart tests the shorted output with a 25mA current to
determine if the short still exists. Once the short is
removed, the MAX8586 automatically restarts the out-
put. An open-drain fault signal notifies the system that
the internal current limit has been reached. A 20ms
fault-blanking feature allows the circuit to ignore
momentary faults such as those caused when hot-
swapping into a capacitive load. An ENRESET input is
available to disable the auto-restart function.
The MAX8586 features a SEL input that programs ON
to be either active high or active low. The IC is supplied
in a space-saving, 8-pin, 3mm x 3mm TDFN package.
♦
Reverse Current Protection
♦
Programmable Current Limit Up to 1.2A
♦
Accurate Current Limit
♦
Selectable Auto-Restart when Fault Is Removed
♦
Thermal-Overload Protection
♦
Selectable Active-High/Low ON Input
♦
Built-In 20ms Fault Blanking
♦
Compliant with All USB Specifications
♦
2.75V to 5.5V Input Supply Range
♦
FAULT
Indicator Output
♦
15kV ESD Protection (with Caps)
♦
UL Listing Pending
♦
Tiny 8-Pin 3mm x 3mm TDFN Package
Features
MAX8586
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
8 TDFN
3mm x 3mm
(T833-2)
TOP
MARK
AMH
Applications
USB Ports/Hubs
Desktop/Notebook Computers
PDAs and Palmtop Computers
Docking Stations
INPUT SUPPLY
2.75V TO 5.5V
MAX8586ETA
-40°C to +85°C
Typical Operating Circuit
OUTPUT SUPPLY
UP TO 1.2A
IN
OUT
OUTPUT
FAULT
INDICATOR
MAX8586
FAULT
ENRESET
AUTO-RESTART
ON/OFF
ON/OFF
POLARITY
SELECTION
ON/OFF
CONTROL
SEL
ISET
ON
GND
Pin Configuration appears at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Single 1.2A USB Switch in
3mm x 3mm TDFN
MAX8586
ABSOLUTE MAXIMUM RATINGS
IN, ON, SEL, OUT,
FAULT,
ISET, ENRESET to GND ..-0.3V to +6V
IN to OUT.....................................................................-6V to +6V
FAULT
Sink Current ............................................................20mA
Continuous Power Dissipation
8-Pin 3mm x 3mm TDFN
(derate 24mW/°C above +70°C) ................................1951mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°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.
ELECTRICAL CHARACTERISTICS
(V
IN
= V
ON
= V
SEL
= V
ENRESET
= 5V, R
ISET
= 26kΩ to GND, R
FAULT
= 100kΩ pullup to V
IN
, C
OUT
= 0.1µF, T
A
= -40°C to +85°C.
Typical values are at T
A
= +25°C, unless otherwise specified. Note 1)
PARAMETER
Supply Voltage Range
V
IN
= 5V
Switch On-Resistance
IN Standby Supply Current
IN Quiescent Supply Current
OUT Off-Leakage Current
Undervoltage-Lockout Threshold
Current-Limit Threshold
V
IN
= 3V
V
IN
= 4.4V
V
ON
= 0V
I
OUT
= 0A
V
ON
= 0V, V
OUT
= 0V
T
A
= +25°C
T
A
= +85°C
2.3
1.2
0.800
0.5
R
ISET
= 26kΩ
R
ISET
= 39kΩ
R
ISET
= 60kΩ
R
ISET
= 26kΩ
R
ISET
= 39kΩ
R
ISET
= 60kΩ
1.35
3
30
0.02
0.6
2.5
1.4
0.925
0.6
1.75
1.2
0.74
0.55
0.37
0.23
1
8
20
40
V
ms
A (RMS)
2.7
1.6
1.050
0.7
2.20
A (Peak)
A
CONDITIONS
MIN
2.75
55
65
95
6
55
1
µA
µA
µA
V
mΩ
TYP
MAX
5.50
UNITS
V
Rising edge, 3% hysteresis (typ)
R
ISET
= 26kΩ
R
ISET
= 39kΩ
R
ISET
= 60kΩ
Peak Short-Circuit Current Limit
V
OUT
= 0V,
(I
OUT
pulsing)
V
OUT
= 0V,
(I
OUT
pulsing)
(Note 2)
RMS Short-Circuit Current Limit
Short-Circuit/Continuous Current Limit
Transition Threshold
Fault-Blanking Timeout Period
From current-limit condition to
FAULT
falling
2
_______________________________________________________________________________________
Single 1.2A USB Switch in
3mm x 3mm TDFN
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
ON
= V
SEL
= V
ENRESET
= 5V, R
ISET
= 26kΩ to GND, R
FAULT
= 100kΩ pullup to V
IN
, C
OUT
= 0.1µF, T
A
= -40°C to +85°C.
Typical values are at T
A
= +25°C, unless otherwise specified. Note 1)
PARAMETER
Turn-On Delay
CONDITIONS
R
OUT
= 10Ω, C
OUT
= 1µF, measured from
ON rising to 10% of V
OUT
, does not include
rise time
R
OUT
= 10Ω, C
OUT
= 1µF, measured from
10% to 90% of V
OUT
R
OUT
= 10Ω, C
OUT
= 1µF measured from
ON falling to 90% of V
OUT
R
OUT
= 10Ω, C
OUT
= 1µF, measured from
90% to 10% of V
OUT
15°C hysteresis (typ)
V
IN
= 2.75V to 4.0V
V
IN
= 4.0V to 5.5V
V
IN
= 2.75V to 4.0V
V
IN
= 4.0V to 5.5V
T
A
= +25°C
I
SINK
= 1mA
V
IN
= 5.5V, T
A
= +25°C
R
ISET
= 26kΩ
26
In latched-off state, V
OUT
= 0V
In latched-off state, V
OUT
rising
In latched-off state, V
OUT
>1V
10
0.4
8
25
0.5
20
600
60
60
0.6
40
-1
1.6
2.0
0.6
0.8
+1
0.4
1
MIN
0.5
TYP
1.5
MAX
4.0
UNITS
ms
MAX8586
Output Rise Time
Turn-Off Delay from ON
Output Fall Time
Thermal-Shutdown Threshold
ON, SEL, ENRESET Logic Input High Voltage
ON, SEL, ENRESET Logic Input Low Voltage
Logic Input Current
FAULT
Output Low Voltage
FAULT
Output High Leakage Current
ISET Current-Limit Trip Point
ISET External Resistance Range
Auto-Restart Current
Auto-Restart Threshold
Auto-Restart Delay
5.5
100
4
+160
1000
ms
µs
ms
°C
V
V
µA
V
µA
mV
kΩ
mA
V
ms
Note 1:
All devices are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by
design.
Note 2:
The output voltage at which the device transitions from short-circuit current limit to continuous current limit.
_______________________________________________________________________________________
3
Single 1.2A USB Switch in
3mm x 3mm TDFN
MAX8586
Typical Operating Characteristics
(Typical Application Circuit, V
IN
= V
ON
= V
SEL
= V
ENRESET
= 5V, T
A
= +25°C, unless otherwise noted.)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8586 toc01
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8586 toc02
SWITCH LEAKAGE CURRENT
vs. TEMPERATURE
0.45
0.40
LEAKAGE CURRENT (µA)
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
V
ON
= 0V
MAX8586 toc03
40
35
SUPPLY CURRENT (µA)
30
25
20
15
10
5
0
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
10
9
8
SUPPLY CURRRENT (µA)
7
6
5
4
3
2
1
0
0
1
2
3
4
5
6
SUPPLY VOLTAGE (V)
V
ON
= 0V
0.50
-40
-15
10
35
60
85
TEMPERATURE (°C)
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX8586 toc04
CONTINUOUS CURRENT LIMIT
vs. TEMPERATURE
MAX8586 toc05
CURRENT LIMIT
vs. TEMPERATURE
1.48
1.46
CURRENT LIMIT (A)
1.44
1.42
1.40
1.38
1.36
1.34
V
ENRESET
= 5V
MAX8586 toc06
1.50
1.60
1.58
1.56
CURRENT LIMIT (A)
1.54
1.52
1.50
1.48
1.46
1.44
1.42
V
ENRESET
= 0V
-40
-15
10
35
60
1.50
1.25
NORMALIZED R
ON
1.00
0.75
1.32
1.30
85
-40
-15
10
35
60
85
0.50
-40
-15
10
35
60
85
TEMPERATURE (°C)
1.40
TEMPERATURE (°C)
TEMPERATURE (°C)
CURRENT LIMIT
vs. INPUT VOLTAGE
MAX8586 toc07
SWITCH ON-TIME
vs. TEMPERATURE
MAX8586 toc08
SWITCH OFF-TIME
vs. TEMPERATURE
9
8
OUTPUT FALL TIME (ms)
7
6
5
4
3
2
1
0
60
85
-40
MEASURED FROM ON LOW UNTIL
V
OUT
FALLS TO 10% OF THE INPUT
-15
10
35
60
85
R
LOAD
= 5Ω
MAX8586 toc09
2.0
1.9
1.8
CURRENT LIMIT (A)
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
2.7
3.4
4.1
INPUT VOLTAGE (V)
4.8
V
ENRESET
= 5V
9.0
8.5
8.0
7.5
ON-TIME (ms)
7.0
6.5
6.0
5.5
5.0
4.5
4.0
MEASURED FROM ON HIGH UNTIL
V
OUT
REACHES 90% OF THE INPUT
-40
-15
10
35
NO LOAD
R
LOAD
= 5Ω
10
5.5
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Single 1.2A USB Switch in
3mm x 3mm TDFN
Typical Operating Characteristics (continued)
(Typical Application Circuit, V
IN
= V
ON
= V
SEL
= V
ENRESET
= 5V, T
A
= +25°C, unless otherwise noted.)
FAULT-BLANKING TIME
vs. TEMPERATURE
MAX8586 toc10
MAX8586
AUTO-RESTART CURRENT
vs. TEMPERATURE
MAX8586 toc11
AUTO-RESTART CURRENT
vs. INPUT VOLTAGE
MAX8586 toc12
35
33
FAULT-BLAMKING TIME (ms)
31
29
27
25
23
21
19
17
15
-40
-15
10
35
60
28
27
AUTO-RESTART CURRENT (mA)
26
25
24
23
22
21
20
40
AUTO-RESTART CURRENT (mA)
35
30
25
20
15
R
LOAD
= 0.5Ω
10
85
-40
-15
10
35
60
85
2.7
3.4
4.1
INPUT VOLTAGE (V)
4.8
5.5
TEMPERATURE (°C)
TEMPERATURE (°C)
OVERLOAD RESPONSE INTO 2Ω
MAX8586 toc13
OVERLOAD RESPONSE INTO SHORT CIRCUIT
MAX8586 toc14
FAULT
5V/div
FAULT
5V/div
I
IN
2A/div
I
IN
2A/div
I
OUT
FAULT REMOVED
V
OUT
2A/div
5V/div
I
OUT
FAULT REMOVED
V
OUT
2A/div
5V/div
10ms/div
10ms/div
SWITCH TURN-ON WAVEFORM INTO NO LOAD
MAX8586 toc15
SWITCH TURN-ON WAVEFORM INTO 5Ω LOAD
MAX8586 toc16
2V/div
2V/div
V
OUT
2V/div
V
OUT
2V/div
V
ON
1ms/div
V
ON
1ms/div
_______________________________________________________________________________________
5
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