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TS39500CZ18 데이터시트(PDF) 6 Page - Taiwan Semiconductor Company, Ltd |
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TS39500CZ18 데이터시트(HTML) 6 Page - Taiwan Semiconductor Company, Ltd |
6 / 12 page TS39500/1/2 1.5A Ultra Low Dropout Voltage Regulator with Multi-Function 6/12 Version: B07 Application Information (Continue) Enable Input TS39501/2 versions feature an active-high enable (EN) input that allows ON/OFF control of the regulator. Current drain reduces to “zero” when the device is shutdown, with only micro-amperes of leakage current. The EN input has TTL/CMOS compatible thresholds for simple interfacing with logic interfacing. EN may be directly tied to VIN and pulled up to the maximum supply voltage. Error Flag TS39501 versions feature an Error Flag, which looks at the output voltage and signals an error condition when this voltage drops 5% below its expected value. The error flag is an open-collector output that pulls low under fault conditions. It may sink 10mA. Low output voltage signifies a number of possible problems, including an over-current fault (the device is in current limit) or low input voltage. The flag output is inoperative during over temperature shutdown conditions. A pull-up resistor from error flag to either VIN or VOUT is required for proper operation. For information regarding the minimum and maximum values of pull-up resistance, refer the graph as follow: Transient Response and 3.3V to 2.5V or 2.5V to 1.8V Conversion TS39500/1/2 has excellent transient response to variations in input voltage and load current. The device have been designed to respond quickly to load current variations and input voltage variations. Large output capacitors are not required to obtain this performance. A standard 10uF output capacitor, preferably tantalum, is all that is required. Larger values help to improve performance even further. By virtue of its low dropout voltage, this device does not saturate into dropout as readily as similar NPN base designs. When converting from 3.3V to 2.5V or 2.5V to 1.8V, the NPN based regulators are already operating in dropout, with typical dropout requirements of 1.2V or greater,. To convert down to 2.5V or 1.8V without operating in dropout, NPN based regulators require an input voltage of 3.7V at the very least. The TS39500/1/2 regulator will provide excellent performance with an input as low as 3.0V or 2.5V respectively. This gives the PNP based regulators a distinct advantage over older, NPN based linear regulators. |
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