Datenblatt-Suchmaschine für elektronische Bauteile |
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TS9020CX6RF Datenblatt(PDF) 3 Page - Taiwan Semiconductor Company, Ltd |
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TS9020CX6RF Datenblatt(HTML) 3 Page - Taiwan Semiconductor Company, Ltd |
3 / 6 page Preliminary TS9020 200mA Dual Channel CMOS LDO with Enable Function 3/6 Version: Preliminary Function Description The TS9020 is a highly accurate, dual, low noised, CMOS LDO voltage regulators with enable function. The output voltage for each regulator is set independently by fuse trimming. As illustrated in function block diagram, it consists of a reference, error amplifier, a P-channel pass transistor, an ON/OFF control logic and an internal feedback voltage divider. The band gap reference is connected to the error amplifier, which compares the reference with the feedback voltage and amplifies the voltage difference. If the feedback voltage is lower than the reference voltage, the pass- transistor gate is pulled lower, which allows more current to pass to the VOUT pin and increases the output voltage. If the feedback voltage is too high, the pass transistor gate is pulled up to decrease the output voltage. The output voltage is feed back through an internal resistive divider connected to VOUT pin. Additional blocks include an output current limiter, thermal sensor, and shutdown logic. Enable EN1 and EN2 pin start and stop the corresponding outputs independently. When the EN pin is switched to the power off level, the operation of all internal circuit stops, the build-in P-channel MOSFET output transistor between pins VIN and VOUT is switched off, allowing current consumption to be drastically reduced. Dropout Voltage A regulator’s minimum input-output voltage differential, or dropout voltage, determines the lowest usable supply voltage. The TS9020 use a P- channel MOSFET pass transistor, its dropout voltage is function of drain-to-source on- resistance RDS(ON) multiplied by the load current VDROP = VIN-VOUT = RDSON * IOUT Current Limit Each channel of TS9020 includes a fold back current limiter. It monitors and controls the pass transistor’s gate voltage, estimates the output current, and limits the output current within 250mA. Thermal Shutdown Protection Thermal Shutdown protection limits total power dissipation of TS9020. When the junction temperature exceeds TJ= +150°C, a thermal sensor turns off the pass transistor, allowing the IC to cool down. The thermal sensor turns the pass transistor on again after the junction temperature cools down by 40°C, resulting in a pulsed output during continuous thermal shutdown conditions. Thermal shutdown protection is designed to protect the TS9020 in the event of fault conditions. For continuous operation, the absolute maximum operating junction temperature rating of TJ=+125°C should not be exceeded. Application Information Like any low-dropout regulator, the TS9020 requires input and output decoupling capacitors. The device is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance (see Capacitor Characteristics Section). Please note that linear regulators with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient decoupling capacitance. Input Capacitor The TS9020 is designed specifically to work with very small ceramic output capacitors. A ceramic capacitor (temperature characteristics X7R, X5R) in 1µF is suitable for the TS9020 application. The recommended minimum capacitance for the device is 1µF, X5R or X7R dielectric ceramic, between VOUT and GND for stability, but it may be increased without limit. Higher capacitance values help to improve transient. The output capacitor’s ESR is critical because if forms a zero to provide phase lead which is required for loop stability. |
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Ähnliche Beschreibung - TS9020CX6RF |
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