MAX1931EUB+-MAX1931EUB+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1931EUB+T ,Current-Limited Switch for Single USB PortApplicationsON 5 6 GNDUSB Ports and HubsμMAXNotebook ComputersPortable EquipmentDocking StationsTyp ..
MAX1932ETC+T ,Digitally Controlled, 0.5% Accurate, Safest APD Bias SupplyElectrical Characteristics(V = 3.3V, CS = SCLK = D = 3.3V, CS+ = CS- = 45V, Circuit of Figure 2, T ..
MAX1935ETA ,500mA, Low-Voltage Linear Regulator in Tiny QFNApplications 8 Thin QFNMAX1935ETA* -40°C to +85°CNotebook Computers3mm x 3mmCellular and Cordless T ..
MAX1935ETA ,500mA, Low-Voltage Linear Regulator in Tiny QFNFeaturesThe MAX1935 low-dropout linear regulator operates Guaranteed 500mA Output Currentfrom a 2. ..
MAX1935ETA ,500mA, Low-Voltage Linear Regulator in Tiny QFNELECTRICAL CHARACTERISTICS(V = V + 500mV or V = 2.25V whichever is greater, SET = GND, SHDN = IN, T ..
MAX1935ETA+ ,500mA, Low-Voltage Linear Regulator in Tiny QFNELECTRICAL CHARACTERISTICS(V = V + 500mV or V = 2.25V whichever is greater, SET = GND, SHDN = IN, T ..
MAX489EEPD ,15kV ESD-Protected / Slew-Rate-Limited / Low-Power / RS-485/RS-422 TransceiversELECTRICAL CHARACTERISTICS(V = 5V ±5%, T = T to T , unless otherwise noted.) (Notes 1, 2)CC A MIN M ..
MAX489EEPD+ ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplicationsPART TEMP RANGE PIN-PACKAGELow-Power RS-485 TransceiversMAX481ECPA 0°C to +70°C 8 Plast ..
MAX489EESD ,【15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversMAX481E/MAX483E/MAX485E/MAX487E–MAX491E/MAX1487E19-0410; Rev 3; 7/96±15kV ESD-Protected, Slew-Rate- ..
MAX489EESD+ ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplicationsMAX481EESA -40°C to +85°C 8 SOIndustrial-Control Local Area Networks MAX483ECPA 0°C to ..
MAX489EESD+T ,±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 TransceiversApplications:state. The receiver input has a fail-safe feature that guar-MAX3440E–MAX3444E: ±15kV E ..
MAX489EPD ,Low-Power / Slew-Rate-Limited RS-485/RS-422 TransceiversELECTRICAL CHARACTERISTICS(V = 5V ±5%, T = T to T , unless otherwise noted.) (Notes 1, 2)CC A MIN M ..

MAX1931EUB+-MAX1931EUB+T
Current-Limited Switch for Single USB Port
General Description
The MAX1931 is a current-limited, 60mΩswitch with
built-in fault blanking. Its accurate preset current limit of
0.64A to 1.06A makes it ideally suited for USB applica-
tions. The device’s low quiescent supply current (14µA)
and shutdown current (1µA) conserve battery power in
portable applications. The MAX1931 operates with
inputs from 2.7V to 5.5V, making it ideal for both 3V and
5V systems.
A fault signal notifies the microprocessor that the inter-
nal current limit has been reached. A 10ms fault-blank-
ing feature allows momentary faults (such as those
caused when hot-swapping into a capacitive load) to be
ignored, thus preventing false alarms to the host system.
This fault blanking also prevents a fault signal from
being issued when the device is powering up.
In the MAX1931, an output overcurrent condition causes
the switch to current limit at 0.64A to 1.06A and FAULT
to go low after the 10ms blanking period. When the
overcurrent condition is removed, FAULTreturns to its
high-impedance state.
The MAX1931 has several safety features to ensure that
the USB port is protected. Built-in thermal overload
protection limits power dissipation and junction tempera-
tures. The device has an accurate internal current-limit-
ing circuitry to protect the input supply against overload.
The MAX1931 is available in a space-saving 10-pin
µMAX package.
Applications
USB Ports and Hubs
Notebook Computers
Portable Equipment
Docking Stations
Hot Plug-In Power Supplies
Battery-Charger Circuits
Features0.5A Guaranteed Output CurrentGuaranteed 0.75A Short-Circuit Protection10ms Internal Fault-Blanking TimeoutNo Fault Signal During Power-UpThermal Shutdown Protection2.7V to 5.5V Supply Range14µA Supply CurrentSmall 10-Pin µMAX Package
MAX1931
Current-Limited Switch for Single USB Port
MAX1931OUTPUTOUT
INPUT
2.7V TO 5.5VON
OFF
GND
FAULT
OUT
OUT
FAULTOUT
OUT
MAX1931
μMAX
TOP VIEW
GNDON
Typical Operating Circuit
19-2357; Rev 0; 4/02
Pin Configuration
Ordering Information
PARTTEMP RANGEPIN-PACKAGE
MAX1931EUB-40°C to +85°C10µMAX
MAX1931
Current-Limited Switch for Single USB Port
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= 5V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°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.
IN, ON(ON), FAULTto GND....................................-0.3V to +6V
OUT to GND................................................-0.3V to (VIN+ 0.3V)
Maximum Continuous Switch Current.....1.2A (internally limited)
OUT Short Circuit to GND..........................................Continuous
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
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
VON= GND, IOUT= 0
ISINK= 1mA, VIN= 3V
VON= VINor GND
VOUT= 4.5V
VIN= 2.7V to 3.6V
VIN= 2.7V to 5.5V= +25°C
VON= VIN= VOUT= 5.5V
Rising edge, 100mV hysteresis
VON= VIN
VIN = 5.5V,
VOUT= GND
OUT shorted to GND
CONDITIONS0.4VOLFAULTOutput Logic
Low Voltage±1ONInput Leakage2VIHONInput Logic High Voltage0.8VILONInput Logic Low Voltage500700ISCContinuous Short-Circuit
Current Limit35IQ14352.75.5VINOperating Voltage
Quiescent Current6408501060ILIMITCurrent Limit180
RONOn-Resistance1501100.0011Off Supply Current2.02.6UVLOUndervoltage Lockout
Off Switch Leakage
UNITSMINTYPMAXSYMBOLPARAMETER
Timer not running
Timer running= +25°C= 0°C to +85°C
VIN= 4.4V to 5.5V
VIN= 4.4V to 5.5V
VIN= 3V
VIN= VFAULT= 5.5VµA1FAULTOutput High
Leakage Current
From overcurrent condition to FAULTassertionms61013tFBFault-Blanking Timeout Period
VIN= 5V, COUT= 150µF, RL= 15Ω,
from ONdriven low to 50% full VOUTms1Startup Time
ILOAD= 400mAµs3620tOFFSwitch Turn-Off Time
ILOAD= 400mAµs80200tONSwitch Turn-On Time165Thermal Shutdown Threshold= 0°C to +85°C
VIN= 3.7V to 5.5V2.4
MAX1931
Current-Limited Switch for Single USB Port
ELECTRICAL CHARACTERISTICS
(VIN= 5V, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)
VIN= VFAULT= 5.5VµA1
VIN= 4.4V to 5.5V
FAULTOutput High
Leakage Current
VON= GND, IOUT= 0, timer not running
From overcurrent condition to FAULTassertion
ISINK= 1mA, VIN= 3V
VON= VINor GND
VOUT= 4.5V
VIN= 3V to 3.6V
VIN= 3V to 5.5V
VON= VIN= VOUT= 5.5V
Rising edge, 100mV hysteresis
VIN= 3V
VON= VIN = 5.5V, VOUT= GND
OUT shorted to GND
CONDITIONS
614tFBFault-Blanking Timeout Period
ILOAD= 400mAµs120tOFFSwitch Turn-Off Time
ILOAD= 400mAµs200tONSwitch Turn-On Time0.4VOLFAULTOutput Logic
Low Voltage±1ONInput Leakage2VIHONInput Logic High Voltage0.8VILONInput Logic Low Voltage750Continuous Short-Circuit
Current LimitIQ3535.5VINOperating Voltage
Quiescent Current6001100ILIMITCurrent Limit
1502Off Supply Current2.02.9UVLOUndervoltage Lockout20Off Switch Leakage
UNITSMINTYPMAXSYMBOLPARAMETER
RONOn-ResistancemΩ
Note 1:Specifications to -40°C are guaranteed by design, not production tested.
VIN= 3.7V to 5.5V2.4
MAX1931
Current-Limited Switch for Single USB Port
Typical Operating Characteristics
(VIN= 5V, TA= +25°C, unless otherwise noted.)13456
QUIESCENT CURRENT vs. INPUT VOLTAGE
MAX1931 toc01
INPUT VOLTAGE (V)
QUIESCENT CURRENT (
IOUT = O
VON (ON) = GND (VIN)
QUIESCENT CURRENT vs. TEMPERATURE
MAX1931 toc02
TEMPERATURE (°C)
QUIESCENT CURRENT (
VIN = 5V
VIN = 3V
OFF SUPPLY CURRENT
vs. TEMPERATURE
MAX1931 toc03
TEMPERATURE (°C)
OFF SUPPLY CURRENT (nA)
VON (ON) = VIN (GND)
OFF SWITCH CURRENT vs. TEMPERATURE
MAX1931 toc04
TEMPERATURE (°C)
OFF SWITCH CURRENT (nA)60
V0N (ON) = VIN (GND)
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX1931 toc05
TEMPERATURE (°C)
NORMALIZED R60
IOUT = 425mA
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX1931 toc06
OUTPUT VOLTAGE (V)
NORMALIZED OUTPUT CURRENT
SHORT-CIRCUIT CURRENT
ILIMIT
TURN-ON TIME vs. TEMPERATURE
MAX1931 toc07
TEMPERATURE (°C)
tON
ILOAD = 425mA
VIN = 3V
VIN = 5V
TURN-OFF TIME vs. TEMPERATURE
MAX1931 toc08
TEMPERATURE (°C)
tOFF
ILOAD = 425mA
VIN = 3V
VIN = 5V
MAX1931
Current-Limited Switch for Single USB Port
Typical Operating Characteristics (continued)
(VIN= 5V, TA= +25°C, unless otherwise noted.)
2ms/div
MAX1931 toc10
CURRENT-LIMIT AND FAULT RESPONSE
CH1 = VIN, 200mV/div, AC-COUPLED; CH2 = VOUT,
5V/div; CH3 = VFAULT, 5V/div; CH4 = IOUT, 500mA/div
10μs/div
CURRENT-LIMIT RESPONSE
MAX1931 toc11
CH1 = VIN, 200mV/div, AC-COUPLED; CH2 = VOUT,
5V/div; CH3 = VFAULT, 5V/div; CH4 = IOUT, 1A/div
SWITCH TURN-ON TIME
MAX1931 toc12
CH1 = VOUT, 5V/div; CH2 = VON, 5V/div;
CH3 = VFAULT, 5V/div; CH4 = IOUT, 200mA/div
20μs/div
FAULT-BLANKING TIMEOUT
vs. TEMPERATURE
MAX1931 toc09
TEMPERATURE (°C)
FAULT-BLANKING TIMEOUT (ms)
VIN = 3V OR 5V
IOUT = 850mA
SWITCH TURN-OFF TIME
MAX1931 toc13
CH1 = VOUT, 5V/div; CH2 = VON, 5V/div;
CH3 = VFAULT, 5V/div; CH4 = IOUT, 200mA/div
1μs/div
STARTUP TIME
(TYPICAL USB APPLICATION)
MAX1931 toc14
CH1 = VOUT, 5V/div; CH2 = VON, 5V/div;
CH3 = IOUT, 500mA/div; CH4 = VFAULT, 5V/div
1ms/div
CL = 150μF
RL = 15Ω
RESISTOR
LOAD
CURRENT
FULL CURRENT LIMIT CHARGES CAPACITOR
FOLDBACK
CURRENT LIMIT
MAX1931
Current-Limited Switch for Single USB Port
_______________Detailed Description
The MAX1931 P-channel MOSFET power switch limits
output current to 0.64A (min) to 1.06A (max). When the
output current is increased beyond the current limit
(ILIMIT), the current also increases through the replica
switch (IOUT / 6500). The current-limit error amplifier
compares the voltage to the internal 1.24V reference
and regulates the current back to the ILIMIT.
This switch is not bidirectional; therefore, the input volt-
age must be higher than the output voltage.
Continuous Short-Circuit Protection
The MAX1931 is a foldback short-circuit-protected
switch. In the event of an output short-circuit or current-
overload condition, the current through the switch is
foldback-current-limited to 500mA continuous.
Thermal Shutdown
The MAX1931 features thermal shutdown. The switch
turns off and the FAULToutput goes low immediately
(no fault blanking) when the junction temperature
exceeds +165°C. When the MAX1931 cools 20°C, the
switch turns back on. If the fault short-circuit condition
is not removed, the switch cycles on and off, resulting
in a pulsed output.
FAULT Indicator
The MAX1931 provides a fault output (FAULT). A
100kΩpullup resistor from FAULTto IN provides a
logic control signal. This open-drain output goes low
when any of the following conditions occur: The input voltage is below the undervoltage lockout
(UVLO) threshold.The die temperature exceeds the thermal shutdown
temperature limit of +165°C.The device is in current limit and the 10ms fault-
blanking period is exceeded.
Fault Blanking
The MAX1931 features 10ms fault blanking. Fault
blanking allows current-limit faults, including momen-
tary short-circuit faults that occur when hot-swapping a
capacitive load, and also ensures that no fault is issued
during power-up. When a load transient causes the
device to enter current limit, an internal counter starts. If
the load fault persists beyond the 10ms fault-blanking
timeout, the FAULToutput asserts low. Ensure that the
MAX1931’s input is adequately bypassed to prevent
input glitches from triggering spurious FAULToutputs.
Input voltage glitches less than 150mV do not cause a
Pin Description
NAMEFUNCTION
1, 3, 9INInput. P-channel MOSFET source. Connect all IN pins together and bypass with a 1µF
ceramic capacitor to ground.
PIN
2, 4, 8, 10OUTSwitch Output. P-channel MOSFET drain. Connect all OUT pins together and bypass with a
0.1µF capacitor to ground.ONActive-Low Switch On Input. A logic low turns the switch on.GNDGroundFAULTFault-Indicator Output. This open-drain output goes low when the device is in thermal shut-
down, undervoltage lockout, or on a sustained (>10ms) current-limit condition.
MAX1931
OUT
GND
1.24V
FAULTCURRENT-LIMIT
AMPLIFIER
REPLICA
AMPLIFIER
HOT
CONTROL
CIRCUITRY
10ms
TIMER
Figure 1. Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX1931EUB+ \|MAX1931EUB	MAXIM	N/a	16	avai	Current-Limited Switch for Single USB Port
MAX1931EUB+ \|MAX1931EUB	MAX	N/a	20	avai	Current-Limited Switch for Single USB Port
MAX1931EUB+T \|MAX1931EUBT	MAX	N/a	2500	avai	Current-Limited Switch for Single USB Port