80m Ω,Adjustable Fast Respon
Current-Limited Power-Distribution Switch
FEATURES
● Compliant to USB S pecifications ● Integrated 80m Ω Power MOSFET ● Low Supply Current
15μA Typical at Switch On State 1μA Typical at Switch Off State
● Wide Input Voltage Range:2.4V to 5.5V ● Fast Transient Respon:<2μs ● Rever Current Flow Blocking ● Thermal Shutdown Protection ● Hot Plug-In Application (Soft-Start) ● Available in a 5-Pin SOT23-5 Package
APPLICATIONS
● USB Bus/Self Powered Hubs ● USB Peripherals ● Notebook Computers ● Battery-Charger Circuits
●
Personal Communication Devices
GENERAL DESCRIPTION
The PL2700 is a cost-effective, low voltage,single P-MOSFET load switch,optimized for lf-powered and bus-powered Universal Serial Bus (USB) applications. This switch operates with inputs ranging f rom 2.4V t o 5.5V, m aking i t i deal f or b oth 3V and 5V s The switch's low R DS(ON), 80m Ω ,meets USB voltage drop requirements. The PL2700 is also protected from thermal overload which limits power dissipation and junction temperatures. Current limit threshold is programmed with a resistor from SET to ground. The quiescent supply current is typically 15μA at switch on state. At switch off state the supply current decreas to less than 1μA.The PL2700 is
5 package.
TYPICAL APPLICATION
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1.5 1 0.5
Figure 1. Basic Application Circuit
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R SET (k Ω)
C u r r e n t L i m i t （A ）
PL2700
PULAN TECHNOLOGY CO., LIMITED
PL2700
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PACKAGE/ORDER INFORMATION
TOP VIEW
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5-LEAD PLASTIC SOT-23
T JMAX = 150°C, θJA = 250°C/ W, θJC = 130°C/W
SOT23-5
PIN DESCRIPTION
PL2700
PULAN TECHNOLOGY CO., LIMITED
PCB Layout Recommendations
When l aying out t he p rinted c ircuit b oard, t he following checking should be ud to ensure proper operation of the PL2700. Check the following in your layout:
Does the (+) p lates of C IN connect t o VIN a s
cloly a s p ossible. T his c apacitor p rovides the AC current to the internal power MOSFETs.
Keep t he (-) p lates o f C IN and C OUT as c lo
as possible
Figure 3. PL2700 Suggested Layout
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ELECTRICAL CHARACTERISTICS (Note 3)
Note 1: Absolute Maximum Ratings are tho values beyond which the life of a device may be impaired. Note 2: T J is c alculated from the a mbient t emperature T A and p ower d issipation P D according t o t he following formula: T J = T A + (P D ) x (250°C/W).
Note 3: 100% production test at 25°C. Specifications over the temperature range are guaranteed by design and characterization.
技术合作协议PL2700
PULAN TECHNOLOGY CO., LIMITED
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage………………..-0.3V to 7V EN Voltages………………...-0.3V to (V IN +0.3V) SET Voltage………………..-0.3V to (V IN +0.3V) Power Dissipation………………………...0.4W Thermal Resistance θJC ……………….130°C/W Thermal Resistance θJA ……………….250°C/W
Junction Temperature(Note2)………..........150°C
Operating Temperature Ra nge…….-40°C to 85°C Lead Temperature(Soldering,10s)………...300°C
Storage Temperature Range……..-65°C to 150°C ESD HBM(Human Body Mode)……………...2kV ESD MM(Machine Mode)………………….200V
TYPICAL PERFORMANCE CHARACTERISTICS
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R SET (k Ω)
PL2700 TURN ON
V IN =5V,C O UT =10u F,T A =25℃
PL2700 TURN OFF V IN =5V,C O UT =10u F,T A =25℃
Short Respon V IN =5V,C O UT =10u F,T A =25℃
C u r r e n t L i m i t （A ）
FUNCTIONAL BLOCK DIAGRAM
散文是什么意思Figure 2. PL2700 Block Diagram APPLICATIONS INFORMATION
The PL2700 is a single channel current limiting load switch that is intended to protect against short circuit and over current events by current limiting t o a pret l evel. This device i s o ptimized for lf-powered and bus powered Universal Serial Bus (USB) applications. The switch's low R DS(ON), 80mΩ , meets USB voltage drop requirements; and a flag output is available to indicate fault conditions to the local USB controller.
Input and Output
V IN (input) is the power source connection to the internal circuitry and the source of the MOSFET. V OUT (output) is the drain of the MOSFET. In a typical application, current flows through the switch from V IN to V OUT toward the load. If V OUT is greater than V IN, current will flow from V OUT to V IN since the MOSFET is bidirectional when on. The PL2700's rever current blocking feature prevents current to flow from V OUT to V IN when the device is disabled.
Soft Start for Hot Plug-In Applications
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In order to eliminate the upstream voltage droop caud by the large inrush current during hot-plug events,the “soft-start” feature effectively isolates the power source from extremely large capacitive loads,satisfying t he USB voltage droop requirements.
Input capacitor
The input capacitor C IN protects the power supply from current transients generated by the load attached to the PL2700. When a short circuit is suddenly applied to the output of the PL2700, a large current, limited only by the R DS(ON) of the MOSFET, will flow for less than 2μs before the current limit circuitry activates. In this event, a moderately sized C IN will dramatically reduce the voltage transient en by the power CS
