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GM66150-1.8TB3T Datasheet(PDF) 9 Page - Gamma Microelectronics Inc. |
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GM66150-1.8TB3T Datasheet(HTML) 9 Page - Gamma Microelectronics Inc. |
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9 / 15 page  APPLICATION INFORMATION The GM66150 series is high performance with low- dropout voltage regulators, suitable for all moderate to high-current voltage regulator applications. Their 350mV dropout voltage at full load makes them espe- cially valuable in battery powered systems and as high efficiency noise filters in "post-regulator" applications. Unlike older NPN-pass transistor designs, for which where the minimum dropout voltage is limited by the base-emitter voltage drop and collector-emitter satura- tion voltage, dropout performance of the PNP output of these devices is limited merely by the low V satura- CE tion voltage. A trade-off for the low dropout voltage is a varying base drive requirement. But, Gamma's PNP process reduces this drive requirement to merely 1% of the load current. The GM66150 series of regulators is fully protected from damage due to fault conditions. Current limiting is provided. This limiting is linear, and output current un- der overload conditions is constant. Thermal shutdown disables the device when the die temperature exceeds the 125°C maximum safe operating temperature. Transient protection allows device (and load) survival even when the input voltage spikes between -20V and +60V. When the input voltage exceeds about 35V to 40V, the overvoltage sensor temporarily disables the regulator. The output structure of these regulators al- lows voltages in excess of the desired output voltage to be applied without reverse current flow. GM66151 and GM66152 versions offer a logic level ON/OFF control: when disabled, the devices draw nearly zero current. An additional feature of this regulator family is a com- mon pinout: a design's current requirement may change up or down yet use the same board layout, as all of these regulators have identical pinouts. + + VIN IN OUT GND VOUT Figure 10. Linear regulators require only two capacitors for operation. Thermal Design Linear regulators are simple to use. The most com- plicated design parameters to consider are thermal characteristics. Thermal design requires the follow- ing application-specific parameters: Maximum ambient temperature, T A Output Current, I OUT Output Voltage, V OUT Input Voltage, V IN First, we calculate the power dissipation of the regu- lator from these numbers and the device parameters from this formula: where the ground current is approximated by 1% of I. OUT Then the heat sink thermal resistance is determined with this formula: where T 125°C and q is between 0 and J(MAX) CS 2°C/W. The heat sink may be significantly reduced in applications where the minimum input voltage is known and is large compared with the dropout volt- age. Use a series input resistor to drop excessive voltage and distribute the heat between this resistor and the regulator. The low dropout properties of Gamma PNP regulators allow very significant reduc- tions in regulator power dissipation and the associ- ated heat sink without compromising performance. When this technique is employed, a capacitor of at least 0.1µF is needed directly between the input and regulator ground. P = I (1.01V - V ) D OUT IN OUT q = (q SA JC + q ) CS T - TA J(MAX) P D 9 |
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