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MAX1946ETAMAXIM ?N/a1257avaiSingle USB Switch with Autoreset and Fault Blanking in Tiny TDFN
MAX1946ETA+ |MAX1946ETAMAXIMN/a1avaiSingle USB Switch with Autoreset and Fault Blanking in Tiny TDFN
MAX1946ETA+T |MAX1946ETATMAXIMN/a4755avaiSingle USB Switch with Autoreset and Fault Blanking in Tiny TDFN


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MAX1946ETA-MAX1946ETA+-MAX1946ETA+T
Single USB Switch with Autoreset and Fault Blanking in Tiny TDFN
General Description
The MAX1946 single current-limited switch with auto-
reset supplies a guaranteed 500mA load in accordance
with USB specifications. The MAX1946 operates from a
2.7V to 5.5V input supply and consumes only 40µA of
quiescent current when operating and only 3µA in shut-
down. Selectable active-high/active-low control logic
and shutdown control provide additional flexibility. An
autoreset feature latches the switch off in the event of a
short circuit, saving system power. The switch reacti-
vates upon removal of the shorted condition.
The MAX1946 provides several safety features to pro-
tect the USB port. Built-in thermal-overload protection
turns off the switch when the die temperature exceeds
+160°C. Accurate internal current-limiting circuitry pro-
tects the input supply against both overload and short-
circuit conditions. An open-drain fault signal, (FAULT),
notifies the microprocessor (µP) when a thermal over-
load, current-limit, undervoltage lockout (UVLO), or
short-circuit fault occurs. A 20ms fault-blanking feature
enables the circuit to ignore momentary faults, such as
those caused when hot-swapping a capacitive load,
preventing false alarms to the host system. The fault-
blanking feature prevents fault signals from being
issued when the device powers up the load.
The MAX1946 is available in a space-saving 8-pin
(3mm x 3mm) TDFN package and operates over the
extended (-40°C to +85°C) temperature range.
Applications
USB Ports and USB Hubs
Notebook and Desktop Computers
PDAs and Palmtop Computers
Digital Cameras
Docking Stations
FeaturesSingle USB Switch in 3mm x 3mm PackageAutoreset Feature Saves System PowerGuaranteed 500mA Load CurrentBuilt-In 20ms Fault-Blanking CircuitryActive-High or Active-Low Control LogicFully Compliant to USB Specifications2.7V to 5.5V Input Voltage RangeFault-Indicator OutputThermal-Overload Protection
MAX1946
Single USB Switch with Autoreset and
Fault Blanking in Tiny TDFN
19-2550; Rev 3; 2/10
Ordering Information
PARTTEMP RANGEPIN-
PACKAGETOP MARK
MAX1946ETA+-40°C to +85°C8 TDFN-EP*ACQSELON2GND
TDFN
TOP VIEW
OUT3
OUT465
MAX1946FAULT
Pin Configuration
OUT
ACTIVE HIGH
ACTIVE LOW
SELECTABLE
OUTON
SEL
FAULT
INPUT
2.7V TO 5.5V
GND
MAX1946
Typical Operating Circuit
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed paddle.
MAX1946
Single USB Switch with Autoreset and
Fault Blanking in Tiny TDFN
ABSOLUTE MAXIMUM RATINGS
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, OUT, SEL to GND........................................-0.3V to +6V
FAULTto GND.............................................-0.3V to (VIN+ 0.3V)
IN to OUT..................................................................-0.3V to +6V
OUT Continuous Switch Current (internally limited)..............1.3A
FAULTDC Current..............................................................10mA
Continuous Power Dissipation (TA= +70°C)
Exposed Pad Must be Soldered to PC Board
8-Pin TDFN (derate 23.8mW/°C above +70°C).........1905mW
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
ELECTRICAL CHARACTERISTICS
(VIN= 5V, CIN= 0.1µF, COUT= 1µF, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note1)
PARAMETERSYM B O L CONDITIONSMINTYPMAXUNITS
Supply Voltage RangeVIN2.75.5V
VIN = 5, TA = +25°C7590
VIN = 5V110Switch On-ResistanceRON
VIN = 3.3V125
Standby Supply CurrentSwitch disabled310µA
Quiescent Supply CurrentIINSwitch enabled, IOUT = 04060µA
Switch disabled, VOUT = 0, TA = +25°C0.011OUT Off-Leakage CurrentILKGSwitch disabled, VOUT = 0, TA = +85°C0.2µA
Undervoltage Lockout ThresholdVULVORising edge, 3% hysteresis2.32.52.7V
Continuous Load Current500mA
Continuous Current LimitILIMVIN_ - VOUT = 0.5V0.741.11.20A
0.81.21.6APKShort-Circuit Current LimitISCVOUT = 0 (IOUT pulsing)0.35ARMS
Short-Circuit Detect Threshold(Note 2)1V
Continuous Current-Limit
Blanking Timeout Period
From continuous current-limit condition to
FAULT asserted102035ms
Short-Circuit Blanking Timeout
Period
From short-circuit current-limit condition to
FAULT asserted7.51835.0ms
Turn-On DelaytONROUT = 10Ω, time from ON to 10% of VOUT,
does not include rise time0.250.61.50ms
Output Rise TimetRISEROUT = 10Ω, from 10% to 90% of VOUT1.2ms
Turn-Off DelaytOFFROUT = 10Ω, time from ON to 90% of VOUT,
does not include fall time0.82ms
Output Fall TimetFALLROUT = 10Ω, from 90% to 10% of VOUT3ms
Thermal-Shutdown Threshold15oC hysteresis160°C
MAX1946
Single USB Switch with Autoreset and
Fault Blanking in Tiny TDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 5V, CIN= 0.1µF, COUT= 1µF, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note1)
PARAMETERSYM B O L CONDITIONSMINTYPMAXUNITS
VIN = 2.7V to 4V1.6ON, SEL Input High LevelVIHVIN = 4V to 5.5V2V
VIN = 2.7V to 4V0.6ON, SEL Input Low LevelVILVIN = 4V to 5.5V0.8V
ON, SEL Input Leakage CurrentVON, VSEL = 0 or VIN, TA = +25°C-1+1µA
FAULT Output Low VoltageVOLISINK = 1mA, VIN = 2.7V0.5V
FAULT Output High Leakage
CurrentVIN = V FAULT = 5.5V1µA
OUT Output Current Autoreset
ModeIn latched off state, VOUT = 0102545mA
OUT Autoreset ThresholdIn latched off state, VOUT rising0.40.50.6V
OUT Autoreset Blanking TimeIn latched off state, VOUT > 0.5V102035ms
ELECTRICAL CHARACTERISTICS
(VIN= 5V, CIN= 0.1µF, COUT= 1µF, TA= -40°C to +85°C, unless otherwise noted.) (Note1)
PARAMETERSYM B O L CONDITIONSMINTYPMAXUNITS
Supply Voltage RangeVIN2.75.5V
VIN = 5, TA = +25°C90
VIN = 5V110Switch On-ResistanceRON
VIN = 3.3V125
Standby Supply CurrentSwitch disabled10µA
Quiescent Supply CurrentIINSwitch enabled, IOUT = 060µA
OUT Off-Leakage CurrentILKGS w i tch d i sabl ed , V OU T = 0, TA = - 40°C to + 25°C 1µA
Undervoltage Lockout ThresholdVULVORising edge, 3% hysteresis2.32.7V
Continuous Load Current500mA
Continuous Current LimitILIMVIN_ - VOUT = 0.5V0.61.3A
Short-Circuit Current LimitISCVOUT = 0 (IOUT pulsing)0.81.6APK
Continuous Current-Limit
Blanking Timeout Period
From continuous current-limit condition to
FAULT asserted1035ms
Short-Circuit Blanking Timeout
Period
From short-circuit current-limit condition to
FAULT asserted7.535.0ms
Turn-On DelaytONROUT = 10Ω. Time from ON to 10% of VOUT.
Does not include rise time.0.251.50ms
MAX1946
Single USB Switch with Autoreset and
Fault Blanking in Tiny TDFN
Note 1:All parts are 100% tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2:Short-circuit detect threshold is the output voltage at which the device transitions from short-circuit current limit to continuous
current limit.
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 5V, CIN= 0.1µF, COUT= 1µF, TA= -40°C to +85°C, unless otherwise noted.) (Note1)
PARAMETERSYM B O L CONDITIONSMINTYPMAXUNITS
Turn-Off DelaytOFFROUT = 10Ω, time from ON to 90% of VOUT,
does not include fall time2ms
VIN = 2.7V to 4V1.6VON, SEL Input High LevelVIHVIN = 4V to 5.5V2V
VIN = 2.7V to 4V0.6VON, SEL Input Low LevelVILVIN = 4V to 5.5V0.8V
ON, SEL Input Leakage CurrentVON, VSEL = 0 or VIN-1+1µA
FAULT Output Low VoltageVOLISINK = 1mA, VIN = 2.7V0.5V
OUT Output Current Autoreset
ModeIn latched off state, VOUT = 01045mA
OUT Autoreset ThresholdIn latched off state, VOUT rising0.40.6V
OUT Autoreset Blanking TimeIn latched off state, VOUT > 0.5V1035ms
QUIESCENT SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1946 toc01
INPUT VOLTAGE (V)
QUIESCENT SUPPLY CURRENT (
VSEL = VON = GND
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX1946 toc02
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (3510-15
VSEL = VON = GND
VIN = 5V
VIN = 5.5V
VIN = 2.7V
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX1946 toc03
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (35-1510
ON = GND, VSEL = 5V
Typical Operating Characteristics
(Circuit of Figure 2, VIN= 5V, CIN= 0.1µF, COUT= 1µF, ON = SEL, TA= +25°C, unless otherwise noted.)
MAX1946
Single USB Switch with Autoreset and
Fault Blanking in Tiny TDFN
SWITCH OFF-LEAKAGE
vs. TEMPERATURE
MAX1946 toc04
TEMPERATURE (°C)
SWITCH OFF-LEAKAGE (nA)3510-15
ON = OUT = GND, VSEL = 5V
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX1946 toc05
TEMPERATURE (°C)
NORMALIZED R3510-15
CONTINUOUS CURRENT-LIMIT
THRESHOLD vs. TEMPERATURE
MAX1946 toc06
TEMPERATURE (°C)
CONTINUOUS CURRENT THRESHOLD (mA)3510-15
VIN = 5.5V
VIN = 5.0V
VIN = 2.7V
TURN-ON TIME
vs. TEMPERATURE (tON + tRISE)
MAX1946 toc07
TEMPERATURE (°C)
TURN-ON TIME (ms)3510-15
VIN = 5V
VIN = 5.5V
VIN = 2.7V
ROUT = 10Ω
TURN-OFF TIME vs. TEMPERATURE
(tOFF + tFALL)
MAX1946 toc08
TEMPERATURE (°C)
TURN-OFF TIME (ms)3510-15
VIN = 5V
VIN = 5.5V
VIN = 2.7V
ROUT = 10Ω
FAULT-BLANKING TIME
vs. TEMPERATURE
MAX1946 toc09
TEMPERATURE (°C)
FAULT-BLANKING TIME (ms)3510-15
VIN = 2.7V
VIN = 5V
VIN = 5.5V19.4
FAULT OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX1946 toc103510-15
VIN = 2.7V
VIN = 5V
VIN = 5.5V
ISINK = 1mA
FAULT OUTPUT LOW VOLTAGE (mV)
AUTORESET CURRENT
vs. TEMPERATURE
MAX1946 toc11
AUTORESET CURRENT (mA)3510-15-4085
VIN = 2.7V
VIN = 5V
VIN = 5.5V
AUTORESET CURRENT
vs. INPUT VOLTAGE
MAX1946 toc12
AUTORESET CURRENT (mA)
TA = +85°C
TA = +25°C
TA = -40°C
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VIN= 5V, CIN= 0.1µF, COUT= 1µF, ON = SEL, TA= +25°C, unless otherwise noted.)
MAX1946
Single USB Switch with Autoreset and
Fault Blanking in Tiny TDFN
OVERLOAD RESPONSE INTO 2.5Ω
MAX1946 toc13
10ms/div
A: VOUT, 5V/div
B: VFAULT, 5V/div
C: IIN, 1A/div
D: IOUT, 1A/div
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VIN= 5V, CIN= 0.1µF, COUT= 1µF, ON = SEL, TA= +25°C, unless otherwise noted.)
OVERLOAD RESPONSE INTO 2.5Ω
(EXPANDED TIME SCALE)
MAX1946 toc14
400μs/div
A: VOUT, 5V/div
B: VFAULT, 5V/div
C: IIN, 1A/div
D: IOUT, 1A/div
SHORT-CIRCUIT RESPONSE INTO 0Ω
MAX1946 toc15
10ms/div
A: VOUT, 5V/div
B: VFAULT, 5V/div
C: IIN, 1A/div
D: IOUT, 1A/div
SHORT-CIRCUIT RESPONSE INTO 0Ω
(EXPANDED TIME SCALE)
MAX1946 toc16
400μs/div
CURRENT TRANSIENT FROM
SHORTING OUTPUT CAPACITANCE
A: VOUT, 5V/div
B: VFAULT, 5V/div
C: IIN, 2A/div
D: IOUT, 10A/div
MAX1946
Single USB Switch with Autoreset and
Fault Blanking in Tiny TDFN
SWITCH TURN-ON TIME
(tON + tRISE)
MAX1946 toc17
1ms/div
COUT = 1μF
ROUT = 10Ω
A: VON, 2V/div
B: VOUT, 2V/div
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VIN= 5V, CIN= 0.1µF, COUT= 1µF, ON = SEL, TA= +25°C, unless otherwise noted.)
SWITCH TURN-OFF TIME
(tOFF + tFALL)
MAX1946 toc18
1ms/div
COUT = 1μF
ROUT = 10Ω
A: VON, 2V/div
B: VOUT, 2V/div
STARTUP WAVEFORMS
COUT = 1μF
MAX1946 toc19
400μs/div
COUT = 1μF
ROUT = 10Ω
A: VOUT, 5V/div
B: VFAULT, 5V/div
C: VOUT, 2V/div
D: IOUT, 500mA/div
STARTUP WAVEFORMS
COUT = 330μF
MAX1946 toc20
1ms/div
COUT = 330μF
ROUT = 10Ω
A: VOUT, 5V/div
B: VFAULT, 5V/div
C: VOUT, 2V/div
D: IOUT, 500mA/div
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