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PDF MAX1558H Data sheet ( Hoja de datos )
| Número de pieza | MAX1558H | |
| Descripción | Dual 3mm x 3mm 1.2A/Programmable-Current USB Switches | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3128; Rev 0; 6/04
www.DataSheet4U.com
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.
Applications
USB Ports and Hubs
Notebook Computers and Desktops
PDAs and Palmtop Computers
Docking Stations
Features
♦ 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
Ordering Information
PART
MAX1558ETB
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
10 TDFN
(3mm x 3mm)
MAX1558HETB
-40°C to +85°C
10 TDFN
(3mm x 3mm)
TOP
MARK
AAR
AAS
Typical Operating Circuit
Pin Configuration
TOP VIEW
INA 1
ONA (ONA) 2
ISET 3
ONB (ONB) 4
INB 5
MAX1558
(MAX1558H)
10 OUTA
9 FLTA
8 GND
7 FLTB
6 OUTB
TDFN
3mm x 3mm
INPUT
2.7V TO 5.5V
INA ONA
INB ONB
OUTA
MAX1558
FLTA
OUTB
FLTB
ISET GND
ONA
ONB
USB
PORT A
USB
PORT B
________________________________________________________________ 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.
1 page  
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Dual, 3mm x 3mm, 1.2A/Programmable-Current
USB Switches with Autoreset
Typical Operating Characteristics (continued)
(VINA = VINB = 5V, VONA = VONB = 0V (MAX1558), VONA = VONB= 5V (MAX1558H), RISET = 26kΩ to GND. Typical values are at TA =
+25°C, unless otherwise noted.)
SHUTDOWN CURRENT vs. TEMPERATURE
4.0
ON_ = VIN_ (MAX1558)
3.5 ON_ = GND (MAX1558H)
3.0
2.5
2.0
1.5
1.0
0.5
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
1.50
1.25
1.00
0.75
0.50
-40
-15 10 35 60
TEMPERATURE (°C)
85
TURN-OFF TIME
vs. TEMPERATURE (tOFF + tFALL)
4.00
3.75 VIN_ = 5.5V
3.50
3.25
3.00
2.75
VIN_ = 4.5V
VIN_ = 5V
2.50
2.25
2.00
-40
-15 10 35 60
TEMPERATURE (°C)
85
SWITCH OFF-LEAKAGE CURRENT
vs. TEMPERATURE
1000
ON_ = IN_ (MAX1558)
ON_ = GND
100 (MAX1558H)
10
1
0.1
0.01
-40
-15 10 35 60
TEMPERATURE (°C)
85
CONTINUOUS CURRENT-LIMIT THRESHOLD
vs. TEMPERATURE
1.45
1.44
1.43
1.42
1.41
1.40
1.39
1.38
1.37
1.36
1.35
-40
-15 10 35 60
TEMPERATURE (°C)
85
FAULT-BLANKING TIME
vs. TEMPERATURE
25
24
VIN_ = 4.5V
23
22
VIN_ = 5V
21 VIN_ = 5.5V
20
-40 -25 -10 5 20 35 50 65 80
TEMPERATURE (°C)
OFF REVERSE-BLOCKING LEAKAGE
CURRENT vs. OUTPUT VOLTAGE
100
10
1
0.1
0
12345
OUTPUT VOLTAGE (V)
6
TURN-ON TIME
vs. TEMPERATURE (tON + tRISE)
8
7 VIN_ = 4.5V
6
5 VIN_ = 5V
4
VIN_ = 5.5V
3
-40
-15 10 35 60
TEMPERATURE (°C)
85
FAULT OUTPUT LOW VOLTAGE
vs. TEMPERATURE
275
250
225 VIN_ = 4.5V
200 VIN_ = 5V
175
VIN_ = 5.5V
150
125
100
-40
-15 10 35 60
TEMPERATURE (°C)
85
_______________________________________________________________________________________ 5
5 Page 
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Dual, 3mm x 3mm, 1.2A/Programmable-Current
USB Switches with Autoreset
For a 5V input and 1V output, the maximum possible
power dissipation per switch is:
P = 0.5 x (1.5A) x (5V - 1V) = 3W
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 VIN_ = 5V and an
autoreset test current of 30mA, the power dissipation
for a short-circuited output is given by:
P = (30mA) x 5V = 0.15W
Chip Information
TRANSISTOR COUNT: 2932
PROCESS: BiCMOS
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1558H.PDF ] | |
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