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CM2843ACIM25 Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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CM2843ACIM25 Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
5 / 11 page CM2843 300mA CMOS LDO WITH EN & PG 2004/06/01 Rev. 1.3 Champion Microelectronic Corporation Page 5 DETAILED DESCRIPTION The CM2843 family of CMOS regulators contain a PMOS pass transistor, voltage reference, error amplifier, over-current protection, output short circuit protection, thermal shutdown, and power good function. The 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℃, 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 CM2843 switches from voltage mode to current mode when the load exceeds the rated output current. This prevents over-stress. The CM2843 also incorporates current fold-back to reduce power dissipation when the output is short-circuited. This feature becomes active when the output drops below 0.95V, and reduces the current flow by 65%. Full current is restored when the voltage exceeds 0.95V. EXTERNAL CAPACITOR The CM2843 is stable with an output capacitor to ground of 2.2µF 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 0.1µF to have a beneficial effect. All capacitors should be placed in close proximity to the pins. A “quiet” ground termination is desirable. 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 1µA. This pin behaves much like an electronic switch. POWER GOOD The CM2843 includes the Power Good feature. Normally, Pin 4 is “Floating”, however, when the output is less than 15% of the specified voltage, it pulls low. This can occur under the following conditions: 1) Input Voltage too low 2) During Over-Temperature 3) During Over-Current |
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Similar Description - CM2843ACIM25 |
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