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CM2835PIM89 Datasheet(PDF) 5 Page - Champion Microelectronic Corp. |
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CM2835PIM89 Datasheet(HTML) 5 Page - Champion Microelectronic Corp. |
5 / 9 page CM2835 300mA CMOS LDO 2006/10/11 Rev1.4 Champion Microelectronic Corporation Page 5 DETAILED DESCRIPTION The CM2835 family 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 150℃, or the current exceeds 300mA. During thermal shutdown, the output voltage remains low. Normal operation is restored when the junction temperature drops below 120℃. The CM2835 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. EXTERNAL CAPACITOR The CM2835 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. TYPICAL CHARACTERISTICS |
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