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1、1PST2014180m Current Limited USB Power Switches?General Description The PST20141 are current limited P-channel MOSFET power switch designed for high-side load switching applications. This switch operates with inputs ranging from 2.5V to 5.5V, making it ideal for both 3.3V and 5V systems. An integrat
2、ed current-limiting circuit protects the input supply against large currents which may cause the supply to fall out of regulation. The PST20141 is also protected from thermal overload which limits power dissipation and junction temperatures. It can be used to control loads that require up to 0.6. Cu
3、rrent limit threshold is fixed internally. The quiescent supply current in active mode is only 25A. In shutdown mode, the supply current decreases to less than 1A.The PST20141 is available in Pb-free packages and is specified over the -40C to +85C ambient temperature range.?Features ?Input Voltage R
4、ange: 2.5V to 5.5V ?Fixed Current Limit ?Reverse Current Blocking ?Short-Circuit Response: 350ns ?Very Low Quiescent Current: 25A (Typ) ?1A Max Shutdown Supply Current ?Under-Voltage Lockout ?Thermal Shutdown ?4kV ESD Rating ?SOT23-5, TSOT23-5 Packages ?Ambient Temperature Range: -40C to +85C?Applic
5、ations ?Laptop/Desktop Computers and NetBooks ?3G Wireless Cards ?Smart Phones and PDAs ?LCD TVs and Monitors ?Set-Top-Boxes ?MP3/MP4 ?Printers ?Portable Game Players ?Portable Media Players and MIDs ?USB Keyboards ?USB Hard Disk Drives ?USB Memory Drives ?USB Hubs?Pin ConfigurationSOT23-5/TSOT23-5
6、(Top View)13316835573wangs2PST2014180m Current Limited USB Power Switches? ?PST20141ETV-40?C to 85?C0.6ASOT23-5-TPST20141EJV-40?C to 85?C0.6ATSOT23-5-T?Available Options of the PowerSiliconTech USB Power SwitchesPART NUMBERCHENABLERds(ON)Current LimitMAX IOUT (DC)PtoP COMPATIBLEPACKAGESPST20141ETV P
7、ST20141EJV1Active High80m0.75A0.6ART9702SOT23-5 TSOT23-5?Typical Application Diagram1uFINGNDENOUTONC2Power Supply 2.5V to 5.5V1uFOFFLoadC1FLTNote: Tantalum or Aluminum Electrolytic capacitors (C1 and C2) may be required for USB applications.?Function Block DiagramThermal SenseDriver & LogicOUTGNDINE
8、NUVLOCurrent LimitCSReverse BlockingFLTLoad discharge path3PST2014180m Current Limited USB Power Switches?Absolute Maximum Rating ParameterRatingUnit IN, EN, /FLT Voltage-0.3 to 6V OUT Voltage-0.3 to VIN+ 0.3V OUT CurrentInternal LimitedA Junction to Ambient Thermal Resistance (JA)250C/W Operating J
9、unction Temperature-40 to 125C Storage Temperature-55 to 150C Lead Temperature (Soldering, 10 sec)300C?Electrical Characteristics(VIN= +5.0V, TA= -40oC to 85oC, typical values at TA=25oC, unless otherwise stated) SymbolParameterTest ConditionsMinTyp.MaxUnit VINInput Voltage Range2.75.5VVUVLOInput UV
10、LO1.82.5VISHDNInput Shutdown Quiescent CurrentDisabled, VEN=0V, OUT floating or shorted to ground0.11?AIQInput Quiescent Current /ChannelEnabled, VEN=VIN, IOUT= 02540?A RDS(ON)Switch on-resistanceVIN= 5V, IOUT= 0.5A, TA=25oC80100m ILMT0.60.750.9A VILEN Input Logic Low Voltage0.8V VIHEN Input Logic H
11、igh Voltage2.0V ISINKEN Input leakageVEN= 5V0.011?A TD(ON)Output Turn-on Delay TimeVIN=5V, CL=1uF, Rload=10?10?s TROutput Turn-on Rise TimeVIN=5V, CL=1uF, Rload=10?800?s TD(OFF)Output Turn-off Delay TimeVIN=5V, CL=1uF, Rload=10?60?s TFOutput Turn-off Fall TimeVIN=5V, CL=1uF, Rload=10?20200?s TFLT_BL
12、ANKFLT Blanking Time4ms VFLT_LoFLT Logic Low VoltageIFLT(SINK)=1mA0.4VIFLTFLT Leakage CurrentVFLT=5V,Enabeld, No Fault Conditions0.11?ARdischrgOutput discharge FET RdsonVIN= 5V, EN=0V, VOUT=5V100200 TSHDNThermal shutdown thresholdVIN= 5V135?C THYSThermal shutdown hysteresisVIN= 5V15?C?Pin Descriptio
13、nPin No.Pin NamePin Function1ENEnable input2GNDGround Pin3/FLTOvercurrent and over-temperature fault reporting signal output, active low with 4.5ms blanking time for overcurrent conditions and 0ms blanking for over-temperature conditions.4INPower supply input. Must be closely decoupled to GND pins w
14、ith a 1F or greater ceramic capacitor.5OUTPower output. A discharge FET is connected to the OUT pin when the device is disabled by EN pin or the input voltage is below UVLO threshold.4PST2014180m Current Limited USB Power Switches?Typical Performance CharacteristicsUVLO at RisingCl=1uF Rout=10UVLO a
15、t FallingCL=1uF Rout=10Current Limit VS TemperatureRDS(on) VS TemperatureSupply Current VS TemperatureCurrent Limit VS Input Voltage5PST2014180m Current Limited USB Power SwitchesCL=1uF Rout=10 to 4Short Circuit Response and Thermal Shut DownThermal Shut DowmOver Load Response VS VoutCL=1uF Rout=10
16、to2Over Load Response VS FLTTurnoff Delay and Fall timeTurnon Delay and Output Response7PST2014180m Current Limited USB Power Switches?Operation PST20141 is an integrated power switch with a low Rdson P-channel MOSFET, internal gate rive circuit, programmable current limiting, and thermal protection. When the PST20141 turns on, it can deliver up to 0.6A continuous current to load. When the
