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MAX1558ETB+T [MAXIM]

Buffer/Inverter Based Peripheral Driver, 2A, BICMOS, 3 X 3 MM, 0.80 MM HEIGHT, MO-229WEED-3, TDFN-10;
MAX1558ETB+T
型号： MAX1558ETB+T
厂家： MAXIM INTEGRATED PRODUCTS    MAXIM INTEGRATED PRODUCTS
描述：

Buffer/Inverter Based Peripheral Driver, 2A, BICMOS, 3 X 3 MM, 0.80 MM HEIGHT, MO-229WEED-3, TDFN-10

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19-3128; Rev 2; 3/08  
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
/MAX158H  
General Description  
Features  
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.  
♦ 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  
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.  
♦ 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 Recognized: UL# E211395  
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.  
Ordering Information  
PIN-  
TOP  
PART  
TEMP RANGE  
PACKAGE  
MARK  
10 TDFN  
(3mm x 3mm)  
MAX1558ETB+  
-40°C to +85°C  
AAR  
AAS  
Applications  
10 TDFN  
(3mm x 3mm)  
MAX1558HETB+ -40°C to +85°C  
USB Ports and Hubs  
Notebook Computers and Desktops  
PDAs and Palmtop Computers  
Docking Stations  
+Denotes a lead-free package.  
Typical Operating Circuit  
Pin Configuration  
INA  
INB  
ONA  
ONB  
ONA  
ONB  
INPUT  
2.7V TO 5.5V  
TOP VIEW  
USB  
PORT A  
OUTA  
10  
9
8
7
6
MAX1558  
FLTA  
MAX1558  
(MAX1558H)  
USB  
PORT B  
OUTB  
FLTB  
ISET  
+
1
2
3
4
5
GND  
TDFN  
3mm x 3mm  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim 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  
ABSOLUTE MAXIMUM RATINGS  
Continuous Power Dissipation (T = +70°C)  
A
10-Pin TDFN 3mm x 3mm  
IN_, ON_, OUT_, ISET, FLT_ to GND........................-0.3V to +6V  
IN_ to OUT_ (when disabled) (Note 1)........................-6V to +6V  
(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  
IN_ to OUT_ (when enabled) (Note 2)............-1.6A to +1.6A  
FLT_ Sink Current................................................................20mA  
RMS  
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  
to prevent permanent device damage. When the MAX1558/MAX1558H  
RMS  
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  
= 5V, V  
= V  
= 0V (MAX1558), V  
= V  
= 5V (MAX1558H), R = 26kΩ to GND, T = 0°C to +85°C,  
ISET A  
INB  
ONA  
ONB  
ONA  
ONB  
unless otherwise noted. Typical values are at T = +25°C.) (Note 3)  
A
PARAMETER  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
5.50  
75  
UNITS  
/MAX158H  
Supply Voltage Range  
2.75  
V
V
V
V
= 5V, T = +25°C  
55  
64  
IN_  
IN_  
IN_  
A
Switch On-Resistance  
R
ON  
= 3.3V, T = +25°C  
mΩ  
A
= 4.4V, T = 0°C to +85°C  
105  
6
A
Standby Supply Current  
Quiescent Supply Current  
Both switches disabled  
Both switches enabled  
3
µA  
µA  
45  
75  
10  
V
V
= V  
= V  
= 0V  
= 5V  
0.03  
0.03  
OUTA  
OUTA  
OUTB  
OUT_ Off-Leakage Current  
Reverse Leakage Current  
Switches disabled  
= 0V, V  
µA  
µA  
OUTB  
V
= V = 5V, both  
OUTB  
IN_  
OUTA  
0.03  
2.5  
switches disabled  
Undervoltage-Lockout Threshold  
Continuous Load Current  
V
Rising edge, 3% hysteresis  
2.3  
1.2  
2.7  
V
A
UVLO  
R
= 26kΩ  
ISET  
R
R
R
R
R
R
R
R
R
= 26kΩ  
= 39kΩ  
= 60kΩ  
= 26kΩ  
= 39kΩ  
= 60kΩ  
= 26kΩ  
= 39kΩ  
= 60kΩ  
1.20  
0.80  
0.50  
1.45  
1.4  
0.925  
0.6  
1.60  
1.05  
0.70  
2.60  
ISET  
ISET  
ISET  
ISET  
ISET  
ISET  
ISET  
ISET  
ISET  
V
0.5V  
- V  
=
IN_  
OUT_  
Current-Limit Threshold  
A
2.0  
V
(I  
= 0V  
pulsing)  
OUT_  
OUT_  
Peak Short-Circuit Current Limit  
RMS Short-Circuit Current Limit  
I
I
1.40  
0.90  
0.55  
0.37  
0.23  
A
(PEAK)  
SHORT  
V
(I  
= 0V  
pulsing)  
OUT_  
OUT_  
A
SHORT  
RMS  
Short-Circuit Continuous Current-  
Limit Transition Threshold  
(Note 4)  
From I  
1
V
Fault-Blanking Timeout Period  
condition to 50% of V  
8
20  
40  
ms  
LIMIT  
FLT_  
R
= 10Ω, C  
= 1µF, does not  
OUT_  
OUT_  
Turn-On Delay  
t
include rise time (from ON asserted to  
0.5  
1.4  
4.0  
ms  
ON  
V
= 10% V  
)
IN_  
OUT_  
2
_______________________________________________________________________________________  
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
/MAX158H  
ELECTRICAL CHARACTERISTICS (continued)  
(V  
INA  
= V  
= 5V, V  
= V  
= 0V (MAX1558), V  
= V  
= 5V (MAX1558H), R = 26kΩ to GND, T = 0°C to +85°C,  
ISET A  
INB  
ONA  
ONB  
ONA  
ONB  
unless otherwise noted. Typical values are at T = +25°C.) (Note 3)  
A
PARAMETER  
Output Rise Time  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
C
= 1µF, R  
= 10Ω, (from 10% to  
OUT_  
OUT_  
t
4
ms  
RISE  
90% of V  
)
OUT_  
R
= 10Ω, C  
= 1µF, does not  
OUT_  
OUT_  
include rise time (from ON deasserted to  
Turn-Off Delay from ON  
t
100  
1000  
µs  
OFF  
V
= 90% V  
)
OUT_  
IN_  
C
= 1µF, R  
= 10Ω (from 90% to  
OUT_  
OUT_  
Output Fall Time  
t
3
ms  
°C  
V
FALL  
10% of V  
)
OUT_  
Thermal-Shutdown Threshold  
10°C hysteresis  
+160  
V
V
V
V
V
= 2.7V to 4.0V  
1.6  
2.0  
IN_  
IN_  
ONA/ONB Logic Input High  
Voltage  
V
IH  
= 4.0V to 5.5V  
= 2.7V to 4.0V  
= 4.0V to 5.5V  
0.6  
0.8  
+1  
IN_  
ONA/ONB Logic Input Low  
Voltage  
V
V
IL  
IN_  
Logic Input Current  
= 0V or V  
= 1mA  
-1  
µA  
V
ON_  
SINK  
IN_  
FLT_ Output Low Voltage  
I
0.4  
FLT_ Output High Leakage  
Current  
V
= V  
= 5.5V  
FLT_  
1
µA  
IN_  
Autorestart Current  
Autorestart Threshold  
Autorestart Delay  
In latched-off state, V  
= 0V  
> 1V  
10  
0.4  
8
25  
0.5  
20  
50  
0.6  
40  
mA  
V
OUT_  
In latched-off state, rising  
In latched-off state, V  
ms  
OUT_  
ELECTRICAL CHARACTERISTICS  
(V  
INA  
= V  
= 5V, V  
= V  
= 0V (MAX1558), V  
= V  
= 5V (MAX1558H), R = 26kΩ to GND, T = -40°C to +85°C,  
ISET A  
INB  
ONA  
ONB  
ONA  
ONB  
unless otherwise noted.)  
PARAMETER  
SYMBOL  
CONDITIONS  
MIN  
TYP  
MAX  
5.5  
75  
UNITS  
Supply Voltage Range  
2.7  
V
V
V
= 5V, T = +25°C  
A
IN_  
IN_  
Switch On-Resistance  
R
ON  
mΩ  
= 4.4V, T = 0°C to +85°C  
105  
6
A
Standby Supply Current  
Both switches disabled  
Both switches enabled  
µA  
µA  
µA  
V
Quiescent Supply Current  
OUT_ Off-Leakage Current  
75  
Switches disabled, V  
= V  
= 0V  
10  
OUTA  
OUTB  
Undervoltage-Lockout Threshold  
Continuous Load Current  
V
Rising edge, 3% hysteresis  
2.3  
1.2  
2.7  
UVLO  
R
= 26kΩ  
A
ISET  
R
R
R
= 26kΩ  
= 39kΩ  
= 60kΩ  
1.20  
0.80  
0.50  
1.60  
1.05  
0.70  
ISET  
ISET  
ISET  
Current-Limit Threshold  
V
- V  
= 0.5V  
A
IN_  
OUT_  
V
(I  
= 0V  
pulsing)  
OUT_  
OUT_  
Peak Short-Circuit Current Limit  
Fault-Blanking Timeout Period  
I
R
= 26kΩ  
1.45  
8
2.60  
40  
A
SHORT  
ISET  
(PEAK)  
ms  
From I  
condition to 50% of V  
FLT_  
LIMIT  
_______________________________________________________________________________________  
3
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
ELECTRICAL CHARACTERISTICS (continued)  
(V  
INA  
= V  
= 5V, V  
= V  
= 0V (MAX1558), V  
= V  
= 5V (MAX1558H), R = 26kΩ to GND, T = -40°C to +85°C,  
ISET A  
INB  
ONA  
ONB  
ONA  
ONB  
unless otherwise noted.)  
PARAMETER  
SYMBOL  
CONDITIONS  
= 10Ω, C = 1µF, does not  
MIN  
TYP  
MAX  
UNITS  
R
OUT_  
OUT_  
include rise time (from ON asserted to  
Turn-On Delay  
t
0.5  
4.0  
ms  
ON  
V
= 10% V  
)
OUT_  
IN_  
R
= 10Ω, C  
= 1µF, does not  
OUT_  
OUT_  
include rise time (from ON deasserted to  
Turn-Off Delay from ON  
t
1000  
µs  
OFF  
V
V
V
V
V
V
= 90% V  
)
IN_  
OUT_  
= 2.7V to 4.0V  
= 4.0V to 5.5V  
= 2.7V to 4.0V  
= 4.0V to 5.5V  
1.6  
2.0  
IN_  
IN_  
ONA/ONB Logic Input High  
Voltage  
V
V
V
IH  
0.6  
0.8  
+1  
IN_  
ONA/ONB Logic Input Low  
Voltage  
V
IL  
IN_  
Logic Input Current  
= 0V or V  
= 1mA  
-1  
µA  
V
ON_  
SINK  
IN_  
FLT_ Output Low Voltage  
I
0.4  
FLT_ Output High Leakage  
Current  
H
V
= V  
= 5.5V  
FLT_  
1
µA  
IN_  
Autorestart Current  
Autorestart Threshold  
Autorestart Delay  
In latched-off state, V  
= 0V  
> 1V  
10  
0.4  
8
50  
0.6  
40  
mA  
V
OUT_  
In latched-off state, rising  
In latched-off state, V  
ms  
OUT_  
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  
= V  
= 5V, V  
= V  
= 0V (MAX1558), V  
= V  
= 5V (MAX1558H), R  
= 26kΩ to GND. Typical values are at T =  
INA  
INB  
ONA  
ONB  
ONA  
ONB  
ISET A  
+25°C, unless otherwise noted.)  
QUIESCENT SUPPLY CURRENT  
vs. SUPPLY VOLTAGE  
QUIESCENT CURRENT vs. TEMPERATURE  
CURRENT-LIMIT PROGRAM vs. R  
ISET  
50  
45  
40  
35  
30  
1.6  
1.5  
1.4  
1.3  
1.2  
1.1  
1.0  
0.9  
0.8  
0.7  
0.6  
0.5  
60  
50  
40  
30  
20  
10  
0
V
IN_  
= 5.5V  
V
IN_  
= 5V  
V
= 4.5V  
IN_  
-40  
-15  
10  
35  
60  
85  
24 28 32 36 40 44 48 52 56 60  
(kΩ)  
0
1
2
3
4
5
6
TEMPERATURE (°C)  
R
ISET  
SUPPLY VOLTAGE (V)  
4
_______________________________________________________________________________________  
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
/MAX158H  
Typical Operating Characteristics (continued)  
(V  
= V  
= 5V, V  
= V  
= 0V (MAX1558), V  
= V  
= 5V (MAX1558H), R  
= 26kΩ to GND. Typical values are at T  
A
=
INA  
INB  
ONA  
ONB  
ONA  
ONB  
ISET  
+25°C, unless otherwise noted.)  
SWITCH OFF-LEAKAGE CURRENT  
vs. TEMPERATURE  
OFF REVERSE-BLOCKING LEAKAGE  
CURRENT vs. OUTPUT VOLTAGE  
SHUTDOWN CURRENT vs. TEMPERATURE  
4.0  
3.5  
3.0  
2.5  
2.0  
1.5  
1.0  
0.5  
0
1000  
100  
10  
100  
10  
1
ON_ = V (MAX1558)  
IN_  
ON_ = GND (MAX1558H)  
ON_ = IN_ (MAX1558)  
ON_ = GND  
(MAX1558H)  
1
0.1  
0.01  
0.1  
-40  
-40  
-40  
-15  
10  
35  
60  
85  
85  
85  
-40  
-15  
10  
35  
60  
85  
0
1
2
3
4
5
6
TEMPERATURE (°C)  
TEMPERATURE (°C)  
OUTPUT VOLTAGE (V)  
CONTINUOUS CURRENT-LIMIT THRESHOLD  
vs. TEMPERATURE  
NORMALIZED ON-RESISTANCE  
vs. TEMPERATURE  
TURN-ON TIME  
vs. TEMPERATURE (t + t  
)
ON RISE  
1.45  
1.44  
1.43  
1.42  
1.41  
1.40  
1.39  
1.38  
1.37  
1.36  
1.35  
1.50  
1.25  
1.00  
0.75  
0.50  
8
7
6
5
4
3
V
= 4.5V  
IN_  
V
= 5.5V  
IN_  
V
= 5V  
IN_  
-40  
-15  
10  
35  
60  
85  
-15  
10  
35  
60  
-40  
-15  
10  
35  
60  
85  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
TURN-OFF TIME  
FAULT-BLANKING TIME  
vs. TEMPERATURE  
FAULT OUTPUT LOW VOLTAGE  
vs. TEMPERATURE  
vs. TEMPERATURE (t  
+ t  
)
OFF FALL  
4.00  
3.75  
3.50  
3.25  
3.00  
2.75  
2.50  
2.25  
2.00  
25  
275  
250  
225  
200  
175  
150  
125  
100  
V
= 5.5V  
IN_  
24  
23  
22  
21  
20  
V
= 4.5V  
IN_  
V
= 4.5V  
IN_  
V
IN_  
= 5V  
V
IN_  
= 5V  
V = 5.5V  
IN_  
V
= 4.5V  
IN_  
V
IN_  
= 5V  
V
= 5.5V  
5
IN_  
-15  
10  
35  
60  
-40 -25 -10  
20 35 50 65 80  
-40  
-15  
10  
35  
60  
85  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
TEMPERATURE (°C)  
_______________________________________________________________________________________  
5
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
Typical Operating Characteristics (continued)  
(V  
= V  
= 5V, V  
= V  
= 0V (MAX1558), V  
= V  
= 5V (MAX1558H), R  
= 26kΩ to GND. Typical values are at T =  
INA  
INB  
ONA  
ONB  
ONA  
ONB  
ISET A  
+25°C, unless otherwise noted.)  
AUTORESET CURRENT  
vs. INPUT VOLTAGE  
AUTORESET CURRENT  
vs. TEMPERATURE  
40  
35  
30  
25  
20  
40  
38  
36  
34  
32  
30  
28  
26  
24  
22  
20  
V
= 5.5V  
IN_  
T
= -40°C  
A
V
IN_  
= 5V  
V
= 4.5V  
IN_  
T
A
= +85°C  
T
A
= +25°C  
3.0  
3.5  
4.0  
4.5  
(V)  
5.0  
5.5  
6.0  
-40  
-15  
10  
35  
60  
85  
V
TEMPERATURE (°C)  
/MAX158H  
IN  
OVERLOAD RESPONSE INTO 2.5Ω  
SHORT-CIRCUIT RESPONSE INTO 0Ω  
MAX1558/58H toc15  
MAX1558/58H toc16  
V
IN  
V
5V  
IN  
5V/div  
0
SWITCH ON  
5V/div  
0
SHORT  
APPLIED  
SHORT  
REMOVED  
OUT_  
FLT_  
V
OUT  
5V/div  
0
5V/div  
0
AUTORESTART  
5V/div  
0
5A/div  
0
FLTA_  
I
OUT_  
I
1A/div  
0
OUT_  
20ms/div  
20ms/div  
SWITCH TURN-OFF TIME  
SWITCH TURN-ON TIME  
MAX1558/58H toc18  
MAX1558/58H toc17  
2V/div  
0
ON_  
2V/div  
ON_  
0
2V/div  
0
OUT_  
2V/div  
0
OUT_  
1.0ms/div  
2.0ms/div  
6
_______________________________________________________________________________________  
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
/MAX158H  
Pin Description  
PIN  
NAME  
FUNCTION  
Power Input for OUTA. Connect INA and INB together and bypass with a 0.1µF capacitor to ground.  
Load conditions may require additional bulk capacitance to prevent the input from being pulled down.  
1
INA  
ONA  
*(ONA)  
Control Input for Switch A. Can be driven higher than IN_ without damage. A logic low turns switch A on  
for the MAX1558. A logic high turns switch A on for the MAX1558H.  
2
3
4
5
6
Current-Limit Adjust for Both Channels. Connect a resistor between 26kΩ to 60kΩ from ISET to ground to  
program the current limit. See Setting the Current Limit in the Applications Information section.  
ISET  
ONB  
*(ONB)  
Control Input for Switch B. Can be driven higher than IN_ without damage. A logic low turns switch B on  
for the MAX1558. A logic high turns switch B on for the MAX1558H.  
Power Input for OUTB. Connect INB and INA together and bypass with a 0.1µF capacitor to ground.  
Load conditions may require additional bulk capacitance to prevent the input from being pulled down.  
INB  
Power Output for Switch B. Connect a 1µF capacitor from OUTB to ground. The load condition may  
require additional bulk capacitance.  
OUTB  
Fault Indicator Output for Switch B. This open-drain output goes low when switch B is in thermal  
shutdown or UVLO or in a sustained (>20ms) current-limit or short-circuit condition.  
7
8
9
FLTB  
GND  
FLTA  
Ground  
Fault Indicator Output for Switch A. This open-drain output goes low when switch A is in thermal  
shutdown or UVLO or in a sustained (>20ms) current-limit or short-circuit condition.  
Power Output for Switch A. Connect a 1µF capacitor from OUTA to ground. The load condition may  
require additional bulk capacitance.  
10  
—
OUTA  
PAD  
Exposed Pad, Internally Connected to GND. Connect exposed pad to a large copper trace for maximum  
power dissipation.  
*( ) are for the MAX1558H only.  
Detailed Description  
The MAX1558/MAX1558H are dual current-limited  
switches designed for USB applications. They have two  
independent switches, each with its own enable control  
input and autoreset function. Each switch has an error-  
flag output to notify the USB controller when current-  
limit, short-circuit, undervoltage-lockout, or thermal-  
shutdown conditions occur (Figure 2). The MAX1558/  
MAX1558H operate from a 2.7V to 5.5V supply. Each  
output can supply up to 1.2A. Current limit for both  
channels is set with one external resistor.  
0.1μF  
INA  
INB  
ONA  
ONB  
ONA  
ONB  
INPUT  
2.7V TO 5.5V  
USB  
PORT A  
OUTA  
100kΩ  
1μF*  
1μF*  
MAX1558  
FLTA  
USB  
PORT B  
OUTB  
100kΩ  
The MAX1558/MAX1558H have independent thermal  
shutdown for each switch in the event of a prolonged  
overload. An autoreset function monitors the output and  
automatically turns the switch on when the overload is  
removed. Separate current limiting and thermal-shut-  
down circuits permit each switch to operate indepen-  
dently, improving system robustness.  
FLTB  
ISET  
GND  
*USB APPLICATIONS MAY REQUIRE ADDITIONAL  
BULK CAPACITANCE  
Figure 1. Typical Application Circuit  
_______________________________________________________________________________________  
7
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
INA  
FLTA  
INA  
ONA  
ONA  
CHARGE  
PUMP  
ILIMA  
30mA  
BIAS  
UVLO  
REF  
OUTA  
THERMAL  
SHUTDOWN  
/MAX158H  
GND  
FAULT  
LOGIC  
30mA  
ILIMB  
OSC  
25kHz  
TIMER  
20ms  
OUTB  
ONB  
ONB  
CHARGE  
PUMP  
INB  
INB  
0.6V  
PROGRAM ILIMA  
PROGRAM ILIMB  
FLTB  
MAX1558  
ISET  
Figure 2. Functional Diagram  
8
_______________________________________________________________________________________  
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
/MAX158H  
Undervoltage Lockout and  
Input Voltage Requirements  
Autoreset Mode  
If an output fault is detected for more than the 20ms  
blanking time, the output latches off and the FLT_ out-  
put goes low. The MAX1558/MAX1558H then source  
30mA to the faulted output and monitor the output volt-  
age to determine when the overload is removed. If the  
voltage on the output rises above 0.5V for more than  
20ms, the fault resets and the output turns on. The  
MAX1558 can also be reset from fault manually by tog-  
gling ON_ (ON_ for the MAX1558H) for that channel.  
The MAX1558/MAX1558H include a UVLO circuit to  
prevent erroneous switch operation when the input volt-  
age is low during startup and brownout conditions.  
Operation is inhibited when V  
is less than 2.5V.  
IN_  
Output-Current Fault Protection  
The current limit for both switch outputs is programmed  
by a resistor between 26kΩ and 60kΩ connected from  
ISET to ground. See the Current-Limit Program vs. R  
ISET  
curve in the Typical Operating Characteristics and Setting  
the Current Limit in the Applications Information section.  
The MAX1558 reduces the gate drive to the MOSFET  
switch when the programmed current-limit value is  
reached. If the current-limit program value is reached, the  
part reduces gate drive to regulate at the current limit. If  
the current limit persists for 20ms (typ), the output turns  
off and the fault flag is set until the fault is removed, as  
detected by the autoreset circuit.  
Reverse Current Blocking  
The USB specification does not allow an output device  
to source current back into the USB port. However, the  
MAX1558/MAX1558H are designed to safely power  
noncompliant devices. When disabled, each output is  
switched to a high-impedance state, blocking reverse-  
current flow from the output back to the input. However,  
during normal operation with the device enabled, the  
MAX1558/MAX1558H are bidirectional switches.  
When the the output drops below 1V (typ), the current  
limit is set 30% above the programmed level and  
pulsed. This lowers the RMS current for a short-circuit  
condition, which reduces system load current and  
power dissipation. If a short circuit persists for 20ms,  
the output turns off and the fault flag is set. The autore-  
set circuit automatically restarts the part if the fault is  
removed.  
Thermal Shutdown  
The MAX1558/MAX1558H feature independent thermal  
shutdown for each switch channel, allowing one switch  
to deliver power even if the other switch has a fault con-  
dition. When the junction temperature exceeds +160°C,  
the switch turns off and the FLT_ output goes low imme-  
diately; fault blanking does not occur during thermal  
limit. When the junction cools by 10°C, the switch turns  
on again. If the fault-overload condition continues, the  
switch cycles on and off, resulting in a pulsed output,  
saving battery power.  
Fault Blanking  
The MAX1558/MAX1558H switches can reach current  
limit in normal operation when powering up or driving  
heavy capacitive loads. To differentiate these conditions  
from short circuits or sustained overloads, the  
MAX1558/MAX1558H have independent fault-blanking  
circuits in each switch. When a load transient causes  
the device to enter the current limit, an internal counter  
monitors the duration of the fault. For load faults exceed-  
ing the 20ms fault-blanking time, the offending switch  
turns off, the corresponding FLT_ signal asserts low,  
and that channel enters autoreset mode (see the  
Autoreset Mode section). Only current-limit and short-  
circuit faults are blanked. Thermal-overload faults and  
input-voltage drops below the UVLO threshold immedi-  
ately cause the switch to turn off and FLT_ to assert low.  
Fault Indicators  
The MAX1558/MAX1558H provide an open-drain fault  
output (FLT_) for each switch. For most applications, con-  
nect FLT_ to IN_ through a 100kΩ pullup resistor. FLT_  
goes low when any of the following conditions occur:  
• The input voltage is below the UVLO threshold.  
• The switch junction temperature exceeds the +160°C  
thermal-shutdown temperature limit.  
• The switch is in current-limit or short-circuit limit mode  
after the 20ms fault-blanking period is exceeded.  
• The switch is in autoreset mode.  
After the fault condition is removed, the FLT_ output  
deasserts after a 20ms delay. Ensure that the  
MAX1558/MAX1558H have adequate input bypass  
capacitance to prevent glitches from triggering FLT_ out-  
puts. Glitches that cause the input supply to drop below  
2.5V may cause the undervoltage lockout to trigger, turn-  
ing the outputs off and asserting the FLT signals.  
Fault blanking allows the MAX1558 to handle USB  
loads that may not be fully compliant with USB specifi-  
cations. USB loads with additional bypass capacitance  
and/or large startup currents can be successfully pow-  
ered even while protecting the upstream power source.  
No fault is indicated if the switch is able to bring up the  
load within the 20ms blanking period.  
_______________________________________________________________________________________  
9
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
Driving Inductive Loads  
A wide variety of devices (mice, keyboards, cameras,  
Applications Information  
Setting the Current Limit  
A resistor from ISET to ground programs the current-  
limit value for both outputs. Use a resistor between  
26kΩ and 86kΩ to set the current limit according to  
the formula:  
and printers) can load the USB port. These devices com-  
monly connect to the port with cables, which can add an  
inductive component to the load. This inductance caus-  
es the output voltage at the USB port to ring during a  
load step. The MAX1558/MAX1558H are capable of dri-  
ving inductive loads, but avoid exceeding the devices’  
absolute maximum ratings. Usually the load inductance  
is relatively small, and the MAX1558/MAX1558Hs’  
input includes a substantial bulk capacitance from an  
upstream regulator as well as local bypass capacitors,  
limiting overshoot. If severe ringing occurs due to large  
load inductance, clamp the MAX1558/MAX1558Hs’ out-  
put below +6V and above -0.3V.  
I
= 36400 / R  
(Amps)  
LIM(TYPICAL)  
ISET  
Do not use R  
values below 26kΩ because the maxi-  
ISET  
mum current rating of the device may be exceeded.  
R
values larger than 60kΩ are not recommended  
ISET  
and do not provide a lower limit current than 500mA.  
If the output drops below 1V (typ), the MAX1558 shifts  
to a short-circuit current-limit threshold that is 30%  
above the programmed level given by the I  
LIM(TYPICAL)  
Turn-On and Turn-Off Behavior  
In the absence of faults, the MAX1558/MAX1558Hs’  
internal switches turn on and off slowly under the control  
of the ON_ inputs. Transition times for both edges are  
approximately 4ms. The slow charge-pump switch drive  
minimizes load transients on the upstream power source.  
Under thermal fault and UVLO, the power device turns  
off rapidly (100ns) to protect the power device.  
formula. If the short-circuit threshold is exceeded, the  
switch shuts off immediately (no 20ms delay) and  
ramps the current back up in approximately 3ms. If the  
short persists and the current ramps all the way up to  
the short-circuit limit again, the switch again turns off. If  
the short still persists, the output pulses this way for  
20ms, at which time the switch turns off and autoreset  
mode begins.  
/MAX158H  
Layout and Thermal Dissipation  
To optimize the switch response time to output short-  
circuit conditions, keep all traces as short as possible  
to reduce the effect of undesirable parasitic induc-  
tance. Place input and output capacitors no more than  
5mm from device leads. All IN_ and OUT_ pins must be  
connected with short traces to the power bus. Wide  
power-bus planes provide superior heat dissipation  
through the switch IN_ and OUT_ pins. While the  
switches are on, power dissipation is small and the  
package temperature change is minimal. Calculate the  
power dissipation for this condition as follows:  
Input Capacitor  
INA and INB provide the power for all control and  
charge-pump circuitry and must be connected together  
externally. Connect a capacitor from IN_ to ground to  
limit the input-voltage drop during momentary output  
short-circuit conditions. A 0.1µF ceramic capacitor is  
required for local decoupling; higher capacitor values  
further reduce the voltage drop at the input. When dri-  
ving inductive loads, a larger capacitance prevents  
voltage spikes from exceeding the MAX1558/  
MAX1558Hs’ absolute maximum ratings.  
Output Capacitor  
Place a 1µF or greater capacitor at each output for  
noise immunity. When starting up into very large capac-  
itive loads, the switch may pulse the output current at  
the short-circuit current-limit program level until the out-  
put voltage rises above 1V. Then, the capacitor contin-  
ues to charge at the full, continuous current-limit  
program level. There is no limit to the output capacitor  
size, but to prevent a startup fault assertion, the capaci-  
tor must charge up within the fault-blanking delay peri-  
od. Typically, starting up into a 500µF or smaller  
capacitor does not trigger a fault output. In addition to  
bulk capacitance, small-value (0.1µF or greater) ceram-  
ic capacitors improve the output’s resilience to electro-  
static discharge (ESD).  
P = (I  
_)2 R  
OUT  
ON  
For the maximum operating current (I  
_ = 1.2A) and  
OUT  
the maximum on-resistance of the switch (125mΩ), the  
power dissipation is:  
P = (1.2A)2 x 0.125Ω = 180mW per switch  
The worst-case power dissipation occurs when the  
switch is in current limit and the output is greater than  
1V. The instantaneous power dissipated in each switch  
is the voltage drop across the switch multiplied by the  
current limit. The fault-blanking circuit turns the output  
off if the fault persists for 20ms, while the autoreset cir-  
cuit can turn it back on after 20ms in the off state. Thus,  
the average worst-case power is approximately 50% of  
the instantaneous value.  
P = 0.5 x (I ) x (V  
- V  
)
OUT_  
LIM  
IN_  
10 ______________________________________________________________________________________  
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
/MAX158H  
For a 5V input and 1V output, the maximum possible  
Chip Information  
power dissipation per switch is:  
TRANSISTOR COUNT: 2932  
P = 0.5 x (1.5A) x (5V - 1V) = 3W  
PROCESS: BiCMOS  
Since the package power dissipation is limited to  
1952mW, the MAX1558/MAX1558H die temperature  
exceeds the thermal-shutdown threshold and the  
switch turns off. After the die temperature cools by  
10°C, the switch turns on again. If the fault-overload  
condition continues, the switch cycles on and off with a  
duty cycle and period that is a function of the ambient  
temperature and PC board layout.  
A short across the output for more than 20ms places  
the part in autoreset mode. With V  
= 5V and an  
IN_  
autoreset test current of 30mA, the power dissipation  
for a short-circuited output is given by:  
P = (30mA) x 5V = 0.15W  
______________________________________________________________________________________ 11  
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
Package Information  
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,  
go to www.maxim-ic.com/packages.)  
/MAX158H  
12 ______________________________________________________________________________________  
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
/MAX158H  
Package Information (continued)  
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,  
go to www.maxim-ic.com/packages.)  
PACKAGE VARIATIONS  
COMMON DIMENSIONS  
SYMBOL  
A
MIN.  
0.70  
MAX.  
0.80  
PKG. CODE  
T633-2  
N
6
D2  
E2  
e
JEDEC SPEC  
MO229 / WEEA  
MO229 / WEEC  
MO229 / WEEC  
MO229 / WEED-3  
MO229 / WEED-3  
- - - -  
b
[(N/2)-1] x e  
1.90 REF  
1.95 REF  
1.95 REF  
1.50±0.10  
1.50±0.10  
1.50±0.10  
1.50±0.10  
1.50±0.10  
1.70±0.10  
1.70±0.10  
2.30±0.10  
2.30±0.10  
2.30±0.10  
2.30±0.10  
2.30±0.10  
2.30±0.10  
2.30±0.10  
0.95 BSC  
0.65 BSC  
0.65 BSC  
0.50 BSC  
0.50 BSC  
0.40 BSC  
0.40 BSC  
0.40±0.05  
0.30±0.05  
0.30±0.05  
0.25±0.05  
0.25±0.05  
0.20±0.05  
0.20±0.05  
T833-2  
8
D
E
2.90  
2.90  
3.10  
3.10  
T833-3  
8
A1  
0.00  
0.20  
0.05  
0.40  
T1033-1  
T1033-2  
T1433-1  
T1433-2  
10  
10  
14  
14  
2.00 REF  
2.00 REF  
2.40 REF  
2.40 REF  
L
k
0.25 MIN.  
0.20 REF.  
- - - -  
A2  
______________________________________________________________________________________ 13  
Dual, 3mm x 3mm, 1.2A/Programmable-Current  
USB Switches with Autoreset  
Revision History  
REVISION  
NUMBER  
REVISION  
DATE  
PAGES  
CHANGED  
DESCRIPTION  
2
3/08  
Changed “UL Listing Pending” to “UL Recognized: UL # E211395”  
1
/MAX158H  
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are  
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.  
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600  
© 2008 Maxim Integrated Products  
is a registered trademark of Maxim Integrated Products, Inc.  

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