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19-3128; Rev 0; 6/04
Dual, 3mm x 3mm, 1.2A/Programmable-Current
USB Switches with Autoreset
General Description
The MAX1558/MAX1558H are dual, current-limited
switches with autoreset for USB applications. Autoreset
latches the switch off if it is shorted for more than 20ms,
saving system power. The shorted output is then tested
to determine when the short is removed to automatically
restart the channel. Each channel delivers up to 1.2A
and meets all IEC specifications for USB ports. Low
quiescent supply current (45µA) and standby current
(3µA) conserve battery power in portable applications.
The MAX1558/MAX1558H safety features ensure that the
USB port is protected. Built-in thermal-overload protection
limits power dissipation and junction temperature.
Accurate, programmable current-limiting circuitry pro-
tects the input supply against both overload and short-cir-
cuit conditions. 20ms fault blanking enables the circuit to
ignore transient faults, such as those caused when hot
swapping a capacitive load, preventing false alarms to
the host system. The MAX1558/MAX1558H also feature
reverse-current protection circuitry to block current flow
from the output to the input when the switches are off.
The MAX1558/MAX1558H are available in space-sav-
ing 3mm x 3mm, 10-pin TDFN packages. The MAX1558
is enabled with an active-low signal, and the
MAX1558H is enabled with an active-high signal.
♦
55mΩ Switch Resistance
♦
Tiny 10-Pin, 3mm x 3mm TDFN Package
♦
14% Accurate Current Limit
♦
Autorestart when Fault is Removed
♦
Programmable Current Up to 1.2A
♦
Thermal-Overload Protection
♦
Built-In 20ms Fault Blanking
♦
Compliant to All USB Specifications
♦
2.7V to 5.5V Supply Range
♦
Independent-Output Fault Indicators
♦
Block Reverse Current when Disabled
♦
15kV ESD Protection (with Capacitor)
♦
UL Listing Pending
Features
MAX1558/MAX1558H
Ordering Information
PART
MAX1558ETB
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
10 TDFN
(3mm x 3mm)
10 TDFN
(3mm x 3mm)
TOP
MARK
AAR
AAS
Applications
USB Ports and Hubs
Notebook Computers and Desktops
PDAs and Palmtop Computers
Docking Stations
INA
MAX1558HETB
Typical Operating Circuit
ONA
ONB
OUTA
ONA
ONB
USB
PORT A
Pin Configuration
TOP VIEW
INPUT
2.7V TO 5.5V
INB
MAX1558
INA
1
ONA (ONA)
2
ISET
3
ONB (ONB)
4
INB
5
10
OUTA
9
FLTA
FLTA
OUTB
USB
PORT B
MAX1558
(MAX1558H)
8
GND
7
FLTB
6
OUTB
FLTB
ISET
GND
TDFN
3mm x 3mm
________________________________________________________________
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.
Dual, 3mm x 3mm, 1.2A/Programmable-Current
USB Switches with Autoreset
MAX1558/MAX1558H
ABSOLUTE MAXIMUM RATINGS
IN_, ON_, OUT_, ISET,
FLT_
to GND........................-0.3V to +6V
IN_ to OUT_ (when disabled) (Note 1) ........................-6V to +6V
IN_ to OUT_ (when enabled) (Note 2)............-1.6A to +1.6A
RMS
FLT_
Sink Current................................................................20mA
Continuous Power Dissipation (T
A
= +70°C)
10-Pin TDFN 3mm x 3mm
(derate 24.4mW/°C above +70°C) .............................1952mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+160°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
Reverse current (current from OUT_ to IN_) is blocked when disabled.
Note 2:
Forward current (current from IN_ to OUT_) is internally limited. Reverse current, from OUT_ to IN_, is not limited when the
device is enabled and must be kept below 1.5A
RMS
to prevent permanent device damage. When the MAX1558/MAX1558H
are disabled, the switch turns off and reverse current is internally blocked.
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
INA
= V
INB
= 5V, V
ONA
= V
ONB
= 0V (MAX1558), V
ONA
= V
ONB
= 5V (MAX1558H), R
ISET
= 26kΩ to GND,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
Supply Voltage Range
V
IN_
= 5V, T
A
= +25°C
Switch On-Resistance
Standby Supply Current
Quiescent Supply Current
OUT_ Off-Leakage Current
Reverse Leakage Current
Undervoltage-Lockout Threshold
Continuous Load Current
Current-Limit Threshold
V
UVLO
R
ON
V
IN_
= 3.3V, T
A
= +25°C
V
IN_
= 4.4V, T
A
= 0°C to +85°C
Both switches disabled
Both switches enabled
Switches disabled
V
OUTA
= V
OUTB
= 0V
V
OUTA
= V
OUTB
= 5V
3
45
0.03
0.03
0.03
2.3
1.2
R
ISET
= 26kΩ
R
ISET
= 39kΩ
R
ISET
= 60kΩ
Peak Short-Circuit Current Limit
I
SHORT
V
OUT_
= 0V
(I
OUT_
pulsing)
V
OUT_
= 0V
(I
OUT_
pulsing)
(Note 4)
From I
LIMIT
condition to 50% of V
FLT_
t
ON
R
OUT_
= 10Ω, C
OUT_
= 1µF, does not
include rise time (from ON asserted to
V
OUT_
= 10% V
IN_
)
8
0.5
R
ISET
= 26kΩ
R
ISET
= 39kΩ
R
ISET
= 60kΩ
R
ISET
= 26kΩ
R
ISET
= 39kΩ
R
ISET
= 60kΩ
1.20
0.80
0.50
1.45
1.4
0.925
0.6
2.0
1.40
0.90
0.55
0.37
0.23
1
20
1.4
40
4.0
V
ms
ms
A
RMS
1.60
1.05
0.70
2.60
A
(PEAK)
A
2.5
2.7
SYMBOL
CONDITIONS
MIN
2.75
55
64
105
6
75
10
µA
µA
µA
µA
V
A
TYP
MAX
5.50
75
mΩ
UNITS
V
V
IN_
= 0V, V
OUTA
= V
OUTB
= 5V, both
switches disabled
Rising edge, 3% hysteresis
R
ISET
= 26kΩ
V
IN_
- V
OUT_
=
0.5V
RMS Short-Circuit Current Limit
Short-Circuit Continuous Current-
Limit Transition Threshold
Fault-Blanking Timeout Period
Turn-On Delay
I
SHORT
2
_______________________________________________________________________________________
Dual, 3mm x 3mm, 1.2A/Programmable-Current
USB Switches with Autoreset
ELECTRICAL CHARACTERISTICS (continued)
(V
INA
= V
INB
= 5V, V
ONA
= V
ONB
= 0V (MAX1558), V
ONA
= V
ONB
= 5V (MAX1558H), R
ISET
= 26kΩ to GND,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 3)
PARAMETER
Output Rise Time
SYMBOL
t
RISE
CONDITIONS
C
OUT_
= 1µF, R
OUT_
= 10Ω, (from 10% to
90% of V
OUT_
)
R
OUT_
= 10Ω, C
OUT_
= 1µF, does not
include rise time (from ON deasserted to
V
OUT_
= 90% V
IN_
)
C
OUT_
= 1µF, R
OUT_
= 10Ω (from 90% to
10% of V
OUT_
)
10°C hysteresis
V
IH
V
IL
V
IN_
= 2.7V to 4.0V
V
IN_
= 4.0V to 5.5V
V
IN_
= 2.7V to 4.0V
V
IN_
= 4.0V to 5.5V
V
ON_
= 0V or V
IN_
I
SINK
= 1mA
V
IN_
= V
FLT
_ = 5.5V
In latched-off state, V
OUT_
= 0V
In latched-off state, rising
In latched-off state, V
OUT_
> 1V
10
0.4
8
25
0.5
20
-1
1.6
2.0
0.6
0.8
+1
0.4
1
50
0.6
40
MIN
TYP
4
MAX
UNITS
ms
MAX1558/MAX1558H
Turn-Off Delay from ON
t
OFF
100
1000
µs
Output Fall Time
Thermal-Shutdown Threshold
ONA/ONB Logic Input High
Voltage
ONA/ONB Logic Input Low
Voltage
Logic Input Current
FLT_
Output Low Voltage
FLT_
Output High Leakage
Current
Autorestart Current
Autorestart Threshold
Autorestart Delay
t
FALL
3
+160
ms
°C
V
V
µA
V
µA
mA
V
ms
ELECTRICAL CHARACTERISTICS
(V
INA
= V
INB
= 5V, V
ONA
= V
ONB
= 0V (MAX1558), V
ONA
= V
ONB
= 5V (MAX1558H), R
ISET
= 26kΩ to GND,
T
A
= -40°C to +85°C,
unless otherwise noted.)
PARAMETER
Supply Voltage Range
Switch On-Resistance
Standby Supply Current
Quiescent Supply Current
OUT_ Off-Leakage Current
Undervoltage-Lockout Threshold
Continuous Load Current
Current-Limit Threshold
V
UVLO
R
ON
V
IN_
= 5V, T
A
= +25°C
V
IN_
= 4.4V, T
A
= 0°C to +85°C
Both switches disabled
Both switches enabled
Switches disabled, V
OUTA
= V
OUTB
= 0V
Rising edge, 3% hysteresis
R
ISET
= 26kΩ
R
ISET
= 26kΩ
V
IN_
- V
OUT_
= 0.5V
V
OUT_
= 0V
(I
OUT_
pulsing)
R
ISET
= 39kΩ
R
ISET
= 60kΩ
Peak Short-Circuit Current Limit
Fault-Blanking Timeout Period
I
SHORT
R
ISET
= 26kΩ
2.3
1.2
1.20
0.80
0.50
1.45
8
1.60
1.05
0.70
2.60
40
A
(PEAK)
ms
A
SYMBOL
CONDITIONS
MIN
2.7
TYP
MAX
5.5
75
105
6
75
10
2.7
UNITS
V
mΩ
µA
µA
µA
V
A
From I
LIMIT
condition to 50% of V
FLT_
_______________________________________________________________________________________
3
Dual, 3mm x 3mm, 1.2A/Programmable-Current
USB Switches with Autoreset
MAX1558/MAX1558H
ELECTRICAL CHARACTERISTICS (continued)
(V
INA
= V
INB
= 5V, V
ONA
= V
ONB
= 0V (MAX1558), V
ONA
= V
ONB
= 5V (MAX1558H), R
ISET
= 26kΩ to GND,
T
A
= -40°C to +85°C,
unless otherwise noted.)
PARAMETER
Turn-On Delay
SYMBOL
t
ON
CONDITIONS
R
OUT_
= 10Ω, C
OUT_
= 1µF, does not
include rise time (from ON asserted to
V
OUT_
= 10% V
IN_
)
R
OUT_
= 10Ω, C
OUT_
= 1µF, does not
include rise time (from ON deasserted to
V
OUT_
= 90% V
IN_
)
V
IN_
= 2.7V to 4.0V
V
IN_
= 4.0V to 5.5V
V
IN_
= 2.7V to 4.0V
V
IN_
= 4.0V to 5.5V
V
ON_
= 0V or V
IN_
I
SINK
= 1mA
V
IN_
= V
FLT
_ = 5.5V
In latched-off state, V
OUT_
= 0V
In latched-off state, rising
In latched-off state, V
OUT_
> 1V
10
0.4
8
-1
1.6
2.0
0.6
0.8
+1
0.4
1
50
0.6
40
MIN
0.5
TYP
MAX
4.0
UNITS
ms
Turn-Off Delay from ON
ONA/ONB Logic Input High
Voltage
ONA/ONB Logic Input Low
Voltage
Logic Input Current
FLT_
Output Low Voltage
FLT_
Output High Leakage
Current
Autorestart Current
Autorestart Threshold
Autorestart Delay
t
OFF
1000
µs
V
IH
V
IL
V
V
µA
V
µA
mA
V
ms
Note 3:
Specifications from 0°C to -40°C are guaranteed by design but not 100% tested.
Note 4:
The output voltage at which the device transitions from short-circuit current limit to continuous current limit. See the
Output-
Current Fault Protection
section.
Typical Operating Characteristics
(V
INA
= V
INB
= 5V, V
ONA
= V
ONB
= 0V (MAX1558), V
ONA
= V
ONB
= 5V (MAX1558H), R
ISET
= 26kΩ to GND. Typical values are at T
A
=
+25°C, unless otherwise noted.)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1558/58H toc01
MAX1558/58H toc02
CURRENT-LIMIT PROGRAM vs. R
ISET
1.6
1.5
1.4
1.3
CURRENT LIMIT (A)
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
24
28
32
36
40
44
48
52
56
60
R
ISET
(kΩ)
0
0
60
50
QUIESCENT CURRENT (µA)
40
30
20
10
QUIESCENT CURRENT vs. TEMPERATURE
V
IN_
= 5.5V
QUIESCENT CURRENT (µA)
45
MAX1558/58H toc03
50
40
V
IN_
= 4.5V
35
V
IN_
= 5V
30
1
2
3
4
5
6
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
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