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AP139-25TW Datasheet(PDF) 5 Page - Anachip Corp |
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AP139-25TW Datasheet(HTML) 5 Page - Anachip Corp |
5 / 8 page AP139 300mA Low-Noise CMOS LDO Anachip Corp. www.anachip.com.tw Rev.1.1 Jun 02, 2006 5/8 Typical Performance Characteristics (Continued) 0 50 100 150 200 250 300 350 400 3.5 4 4.555.5 6 6.5 7 Vcc Vs Short Current Vcc (V) Top to bottom Vout=1.5V Vout=1.8V Vout=2.5V Vout=3.3V Function Description The AP139 of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, thermal shutdown. The P-channel pass transistor receives data from the error amplifier, over-current 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 130 oC, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 110 oC. The AP139 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. Enable The 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 2µA. This pin behaves much like an electronic switch. External Capacitor The AP139 is stable with a low ESR output capacitor to ground of 1.0µF or greater. It can keep stable even with higher ESR capacitors. A second capacitor is recommended between the input and ground to stabilize VIN. The input capacitor should be larger than 0.1µF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A “quiet” ground termination is desirable. |
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