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TS9001XCX5RF Datasheet(PDF) 3 Page - Taiwan Semiconductor Company, Ltd |
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TS9001XCX5RF Datasheet(HTML) 3 Page - Taiwan Semiconductor Company, Ltd |
3 / 6 page TS9001 Series 300mA CMOS LDO with Enable 3/6 Version: C12 Detail Description Description The TS9001 series of CMOS regulators contain a P-MOS pass transistor, voltage reference, error amplifier, over current protection, thermal shutdown and short circuit protection. The TS9001 series switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over stress. The TS9000 also incorporates current fold-back to reduce power dissipation when the output is short circuit. This feature becomes active when the output drops below 1.05V, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.95V. The internal P-channel pass transistor receives data from the error amplifier, over current shutdown, short output protection and thermal protection circuits. During normal operation, the error amplifier compares the output voltage to a precision reference. Over current and thermal shutdown circuits become active when the junction temperature exceeds 150 oC, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120 oC. Enable The Chip Enable pin normally floats high. When actively, pulled low, the PMOS pass transistor shut off, and all internal circuits are powered down. In this state, the quiescent current is less than 5uA. This pin behaves much like an electronic switch. External Capacitor The TS9001 series is stable with an output capacitor to ground of 2.2uF or greater. It can keep stable even with higher or poor ESR capacitors. A second capacitor is recommended between the input and ground to stabilize Vin. The input capacitor should be larger than 0.1uF to have a beneficial effect. A third capacitor can be connected between the Bypass pin and Ground. This capacitor can be a low cost polyester film variety between the value of 1~10nF. A larger capacitor improves the AC ripple rejection, but also makes the output come up slowly. This “soft” turn-on is desirable in some applications to limit turn-on surges. All capacitors should be placed in close proximity to the pins. A “quiet” ground termination is desirable. |
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