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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SP2525 데이터시트(PDF) 4 Page - Sipex Corporation |
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SP2525 데이터시트(HTML) 4 Page - Sipex Corporation |
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4 / 16 page  4 Rev. 8/21/01 SP2525 +3.0 to +5.5 Power Control Switch © Copyright 2001 Sipex Corporation FEATURES The SP2525 device is a single +3.0V to +5.5V USB Supervisory Power Control Switch ideal for self-powered and bus-powered Universal Serial Bus (USB) applications. USB provides a +5.0V bus and ground return line in addition to a twisted pair line for data. Features of the SP2525 device include current limiting, a +2.7V undervoltage lockout, over- temperature shutdown, error flag output, soft start power up, a switch-on resistance of 140m Ω over the entire supply range, and a supply current of 80 µA. The SP2525-1 device has active-high inputs. The SP2525-2 device has active-low inputs. THEORY OF OPERATION There are operational conditions that will en- able or disable one or more of the output transistors, depending on the type of hazard. Certain conditions will activate the open-drain error flag transistors forcing the flag output to ground. The SP2525 device is a single inte- grated high-side power switch optimized for self-powered and bus-powered Universal Se- rial Bus (USB) applications. The SP2525 de- vice provides the following functions: 1) Solid State Switch : MOSFET M1 connects the IN pin to the OUT pins when enabled by a logic signal at the EN pin. 2) Fault Flag Conditions : The FLG pin is an N-channel, open-drain MOSFET output ca- pable of sinking a 10mA load to typically 100mV above ground. 3) Undervoltage Lockout : The lockout mecha- nism monitors the input voltage and will enable the MOSFET switch only when the input sig- nal is >2.7V. 4) Current Limiting Threshold : A current limiting threshold is set internally to prevent any damage to the device and external load. 5) Thermal Shutdown : This mechanism pro- tects the device switch and signals a fault condi- tion if the die temperature exceeds 135OC. This function has 10OC of hysteresis that prevents the MOSFET switches from turning on until the die temperature drops to 125OC. Input and Output The independent solid state switch connects the IN pin to the OUT pin when enabled by a logic signal at EN. The IN pin is the power supply connection to the internal circuitry and the drain of the output MOSFET. The OUT pin is the source of the MOSFET. Typically, the current in USB application will flow through the switch from IN to OUT towards the load. If V OUT is greater than VIN when a switch is enabled, the current will flow from OUT to the IN pin because the MOSFET channels are bidi- rectional when switched on. Under normal operating conditions, the MOSFET switch will present 140m Ω maximum resistance when closed. The device is designed to allow out pin to be externally forced to a higher voltage than the IN pin when the switch is off. Fault Flag Conditions The fault flag is an N-channel, open drain MOSFET output. The active low fault flag is asserted when one of the following conditions exist: 1. Undervoltage 2. Soft Start 3. Overcurrent 4. Overtemperature Undervoltage Lockout This voltage lockout mechanism prevents the output MOSFET switches from turning on until V IN is >2.7V. After the switch turns on, if the voltage at V IN drops below +2.5V, the lockout circuitry shuts off the output MOSFET switch and signals the FLG fault flag. In the undervoltage lockout state, the FLG pin will be at a logic low. This detection functions only when the MOSFET switch is enabled. |
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