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SP2526 Datasheet(PDF) 4 Page - Sipex Corporation |
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SP2526 Datasheet(HTML) 4 Page - Sipex Corporation |
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4 / 18 page  4 Rev. 8/21/01 SP2526 +3.0V to +5.5V USB Power Control Switch © Copyright 2001 Sipex Corporation FEATURES Features of the SP2526 device include current limiting, a +2.7V undervoltage lockout, over- temperature shutdown, error flag output, soft start, a switch-on resistance of 100m Ω over the entire supply range, and a supply current of 100 µA. The SP2526-1 device has an active- high enable. The SP2526-2 device has an active-low enable. THEORY OF OPERATION The SP2526 is a dual integrated high-side power switch optimized for self-powered and bus- powered Universal Serial Bus (USB) applica- tions. There are operational conditions that will enable or disable one or more of the output MOSFET switches, depending on the type of hazard. Certain conditions will activate the open-drain error flag transistors forcing the flag outputs to ground. The SP2526 provides the following functions: 1) Independent Solid State Switches: Indepen- dent MOSFET switches connect the IN pin to the OUTA and OUTB pins when enabled by logic signals at the ENA and ENB control pins. 2) Fault Flag Conditions: Both the FLGA and FLGB pins are N-channel, open-drain MOSFET outputs capable 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 switches only when the voltage at the V IN pin is greater than +2.7V. 4) Current Limiting Threshold: A current limiting threshold prevents damage to the de- vice and external load. 5) Thermal Shutdown: This mechanism pro- tects the SP2526 and signals a fault condition if the die temperature exceeds 135OC (typical). This function has 10OC of hysteresis that pre- vents the MOSFET switches from turning on until the die temperature drops to 125OC (typi- cal). Input and Output The independent solid state MOSFET switches connect the USB +5.0V supply voltage at the IN pin to the OUTA and OUTB pins when enabled by logic signals at ENA and ENB. The IN pin is the power supply connection to the device and the drain of the output MOSFET switches. Typically, the current will flow through the switches from IN to OUTA and OUTB towards the load. If V OUT is greater than VIN when a switch is enabled, the current will flow from OUTA or OUTB to the IN pin because the MOSFET chan- nels are bidirectional when switched on. Under normal operating condition, the MOSFET switches will present 100m Ω maximum resis- tance when closed. The output MOSFETs and driver circuitry are designed to allow the MOSFET source to be externally forced to a higher voltage than the drain when the switch is off. Fault Flag Conditions Fault conditions disable one or both MOSFET switches, depending on the type of fault. FLGA and FLGB are N-channel, open-drain MOSFET outputs. The active low fault flag occurs when one of the following conditions exist: 1. Undervoltage 2. Overcurrent 3. Overtemperature Undervoltage Lockout This voltage lockout mechanism prevents the MOSFET switches from turning on until V IN is greater than +2.7V. After the switch turns on, if the voltage at V IN drops below +2.6V, the lockout circuitry shuts off both switches and signals the FLGA and FLGB fault flags. In the undervoltage lockout state, the FLGA and FLGB pins will be asserted. This detection functions only when at least one MOSFET switch is enabled. Output Current Limiting The SP2526 has a preset current-limit threshold. These switch control circuits will implement current limiting which prevents damage to the SP2526 and the external load while allowing a |
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