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G525A2 Datasheet(PDF) 6 Page - Global Mixed-mode Technology Inc |
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G525A2 Datasheet(HTML) 6 Page - Global Mixed-mode Technology Inc |
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6 / 8 page  Ver: 1.2 Nov 11, 2002 TEL: 886-3-5788833 http://www.gmt.com.tw 6 G525A Global Mixed-mode Technology Inc. from turning on until the die temperature drops to 125°C. Thermal shutdown circuit functions only when the switch is enabled. Undervoltage Lockout UVLO (undervoltage lockout) prevents the output MOSFET from turning on until IN (input voltage) ex- ceeds 2.5V typically. After the switch turns on, if the voltage drops below 2.3V typically, UVLO shuts off the output MOSFET and signals the fault flag. UVLO de- tection functions only when the switch is enabled. Current Sensing and Limiting The current limit threshold is preset internally. The preset level prevents damage to the output MOSFET and external load but allows a minimum current of 0.5A through the output MOSFET. A current sense circuit senses the output current of MOSFET switch. If output current exceeds the current limit threshold, the output MOSFET switch is shut off and a fault flag is pulled low. The reaction to an over- current is measured with the following scenarios: Switch Enabled into Heavy Load If the switch is powered on or enabled into a heavy load or short-circuit, the switch immediately goes into a constant-current mode, reducing the output voltage. The fault flag goes low until the load is reduced or thermal shutdown occurs. See the "Enable into Short Circuit" graph. Heavy Load Applied to Enabled Switch When a heavy load is applied, a large current may flow from the switch. The current limit circuit may shut the switch off briefly, then fold back into con- stant-current mode. In that case, the fault flag falls until the load is reduced. See the “Short Applied to Output” graph and the "Ramped Load to Enable De- vice" graph. Fault Flag FLG is a 2-channel, open-drain MOSFET output. The fault-flag is active (low) for one or more of the follow- ing conditions: current limiting, undervoltage, or ther- mal shutdown. The flag output MOSFET is capable of sinking a 10mA load to typically 100mV above ground. Applications Information Supply filtering A 0.1µF to 1µF bypass capacitor from IN to GND, lo- cated near the G525A, is strongly recommended to control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. Input transients must not exceed the absolute maxi- mum supply voltage (VIN max = 6V) even for a short du- ration. Figure 1. Supply Bypassing Figure 2. Soft Start EN FLG GND NC OUT IN OUT NC G525A 3.0V to 5.5V 1 2 3 4 8 7 6 5 0.1 µF to 1 µF EN FLG GND NC OUT IN OUT NC G525A 3.0V to 5.5V 1 2 3 4 8 7 6 5 0.1 µF to 1 µF USB Host GND V BUS Cable Bus Powered Hub USB Controller EN FLG GND NC OUT IN OUT NC C BULK 4.7 µF G525A Cable Downstream USB Device Capacitive Load 1 2 3 4 8 7 6 5 0.1 µF USB Host GND V BUS Cable Bus Powered Hub USB Controller EN FLG GND NC OUT IN OUT NC C BULK 4.7 µF G525A Cable Downstream USB Device Capacitive Load 1 2 3 4 8 7 6 5 0.1 µF |
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