MAX1812EUB ,Dual USB Switch with Fault BlankingApplications Ordering InformationUSB Ports PART TEMP. RANGE PIN-PACKAGEUSB HubsMAX1812EUB -40°C to ..
MAX1812EUB ,Dual USB Switch with Fault Blankingfeatures to ensure +4.0V to +5.5V Input Voltage Rangethat the USB port is protected. Built-in the ..
MAX1812EUB ,Dual USB Switch with Fault Blankingapplications. Each channel is guar- Guaranteed 500mA Load per Channelanteed to supply 500mA and me ..
MAX1812EUB+ ,Dual USB Switch with Fault BlankingApplications Ordering InformationUSB PortsPART TEMP. RANGE PIN-PACKAGEUSB HubsMAX1812EUB -40°C to ..
MAX1812EUB+ ,Dual USB Switch with Fault Blankingfeatures to ensure ♦ +4.0V to +5.5V Input Voltage Rangethat the USB port is protected. Built-in the ..
MAX1812EUB+T ,Dual USB Switch with Fault BlankingELECTRICAL CHARACTERISTICS(V = V = V = 5V, T = -40°C to +85°C, unless otherwise noted. Typical valu ..
MAX4678EPE+ ,2Ω, Quad, SPST, CMOS Analog SwitchesApplicationsMAX4678EPE -40°C to +85°C 16 DIPReed Relay Replacement Avionics MAX4679EUE -40°C to +85 ..
MAX4678EUE ,2 / Quad / SPST / CMOS Analog SwitchesApplicationsMAX4678EPE -40°C to +85°C 16 DIPReed Relay Replacement Avionics MAX4679EUE -40°C to +85 ..
MAX4678EUE+ ,2Ω, Quad, SPST, CMOS Analog SwitchesELECTRICAL CHARACTERISTICS–Dual Supplies(V+ = +5V ±10%, V- = -5V ±10%, V = +2.7V to V+, GND = 0, V ..
MAX4678EUE+ ,2Ω, Quad, SPST, CMOS Analog SwitchesFeaturesThe MAX4677/MAX4678/MAX4679 quad analog switch-♦ On-Resistance 1.6Ω maxes feature 1.6Ω max ..
MAX467CPE ,Two-Channel, Triple/Quad RGB Video Switches and BuffersELECTRICAL CHARACTERISTICS(V+ = 5V, V- = -5V, -2V ≤ V ≤ +2V, R = 75Ω, unless otherwise noted.)IN LO ..
MAX4680CAE ,1.25 / Dual SPST / CMOS Analog SwitchesApplicationsMAX4680CWE 0°C to +70°C 16 Wide SOMAX4680CPE 0°C to +70°C 16 Plastic DIPReed Relay Repl ..
MAX1812EUB
Dual USB Switch with Fault Blanking
General DescriptionThe MAX1812 is a dual current-limited switch specifi-
cally made for USB applications. Each channel is guar-
anteed to supply 500mA and meets USB specifications.
The MAX1812’s low quiescent supply current (45µA)
and shutdown current (3µA) conserve battery power in
portable applications.
The MAX1812 has multiple safety features to ensure
that the USB port is protected. Built-in thermal-overload
protection limits power dissipation and junction temper-
ature. The device also has accurate internal current-lim-
iting circuitry to protect the input supply against both
overload and short-circuit conditions. Independent fault
signals (FAULTAand FAULTB) notify the microproces-
sor when a thermal-overload, current limit, undervoltage
lockout, or short-circuit fault occurs. A 20ms fault-blank-
ing feature enables the circuit to ignore momentary
faults, such as those caused when hot-swapping a
capacitive load, thereby preventing false alarms to the
host system.
The MAX1812 is available in a space-saving 10-pin
µMAX package. For single versions of this device, refer
to the MAX1693, MAX1694, and MAX1607 data sheets.
________________________ApplicationsUSB Ports
USB Hubs
Notebook Computers
Desktop Computers
PDAs and Palmtop Computers
Docking Stations
FeaturesDual USB Switch in Tiny 10-Pin µMAX PackageGuaranteed 500mA Load per ChannelBuilt-In 20ms Fault BlankingCompliant to USB Specifications+4.0V to +5.5V Input Voltage Range45µA Quiescent Current3µA Shutdown CurrentIndependent Shutdown ControlIndependent FAULTIndicator OutputsThermal-Overload ProtectionUL Listing Pending
MAX1812
Dual USB Switch with Fault Blanking
Pin Configurationypical Operating Circuit19-1865; Rev 0; 11/00
Ordering Information
MAX1812
Dual USB Switch with Fault Blanking
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICSStresses 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.
IN, INA, INB, ONA, ONB, OUTA, OUTB to GND......-0.3V to +6V
FAULTA, FAULTBto GND.........................-0.3V to (VIN_ + 0.3V)
INA, IN to OUTA; INB, IN to OUTB..........................-0.3V to +6V
OUTA, OUTB Maximum Continuous Switch Current
(per channel, internally limited) .........................................1.2A
FAULTA, FAULTBCurrent .................................................20mA
Continuous Power Dissipation (TA= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C)............444mW
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
MAX1812
Dual USB Switch with Fault Blanking
ELECTRICAL CHARACTERISTICS (continued)(VIN= VINA= VINB= 5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 2:The output voltage at which the device transitions from short-circuit current limit to continuous current limit.
Typical Operating Characteristics(VIN= VINA= VINB= 5V, Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
MAX1812
Dual USB Switch with Fault Blanking
Typical Operating Characteristics(VIN= VINA= VINB= 5V, Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
MAX1812
Dual USB Switch with Fault Blanking
Typical Operating Characteristics (continued)(VIN= VINA= VINB= 5V, Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
MAX1812
Detailed DescriptionThe MAX1812 is a dual current-limited switch designed
specifically for USB applications. It has two indepen-
dent switches, each with its own enable control input.
Each switch also has an independent error flag output
to notify the USB controller when the current-limit, short-
circuit, undervoltage-lockout, or thermal-shutdown
threshold is reached (Figure 1).
The MAX1812 operates from a +4V to +5.5V input volt-
age and guarantees a minimum output current of
500mA. A built-in current-limit of 0.9A (typ) limits the
current in the event of a heavy overload condition. The
MAX1812 has independent thermal shutdown for each
switch in the event of a prolonged overload or short-cir-
cuit condition.
Use of internal low RONNMOS switches enables the
MAX1812 to fit two switches in the ultra-small 10-pin
µMAX package. An internal micropower charge pump
generates the high-side supply needed for driving the
gates of these high-side switches. Separate current-
limiting and thermal-shutdown circuits permit each
switch to operate independently, improving system
robustness.
Undervoltage Lockout and
Input Voltage RequirementsThe MAX1812 includes an undervoltage-lockout
(UVLO) circuit to prevent erroneous switch operation
when the input voltage goes low during startups and
brownout conditions. Operation is inhibited when VIN_
< 3.4V.
Output Fault ProtectionThe MAX1812 senses the switch output voltage and
selects continuous current limiting when VOUT_ > 1V, or
pulsed current limiting when VOUT_< 1V. When VOUT_
> 1V, the device operates in a continuous current-limit
mode, which sets the output current limit to 0.9A (typ).
When VOUT_< 1V, the device operates in short-circuit
current-limit mode. The MAX1812 pulses the output
current at 400Hz to limit the output current to 0.35A
(RMS).
Thermal ShutdownThe MAX1812 features independent thermal shutdown
for each switch channel, allowing one switch to deliver
power even if the other switch has a fault condition.
When the junction temperature exceeds +160°C, the
switch turns off and the FAULT_output goes low imme-
diately; fault blanking does not occur during thermal
limit. When the junction cools by 15°C, the switch turns
back on again. If the fault overload condition continues,
the switch will cycle on and off, resulting in a pulsed
output that saves battery power.
Fault IndicatorsThe MAX1812 provides an open-drain fault output
(FAULT_)for each switch. For most applications, con-
nect FAULT_to IN_ through a 100kΩpullup resistor.
Dual USB Switch with Fault Blanking
