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LM29151R-3.0 Datasheet(PDF) 6 Page - HTC Korea TAEJIN Technology Co. |
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LM29151R-3.0 Datasheet(HTML) 6 Page - HTC Korea TAEJIN Technology Co. |
6 / 7 page 1.5A Very L.D.O Voltage Regulator LM29150/1/2/3 Applications Information The LM29150 are high performance low-dropout voltage regulators suitable for all moderate to high -current voltage regulator applications. Their 350mV dropout voltage at full load make them especially valuable in battery powered systems and as high efficiency noise filters in "post-regulator" applications. Unlike older NPN-pass transistor designs, dropout performance of the PNP output of these devices is limited merely by the low Vce saturation voltage. The LM29150 family of regulators is fully protected from damage due to fault conditions. Current Limiting is provided. This limiting is linear; output current under overload conditions is constant. Thermal shutdown disables the device when the die temperature exceeds the 125℃ maximum safe operating temperature. Transient protection allows device survival even when the input voltage spikes between -20V and +60V. When the input voltage exceeds about 35V to 40V. The over voltage sensor temporarily disables the regulator. Figure 3. Linear regulators require only two capacitors for operation. Thermal Design Linear regulators are simple to use. The most complicated design parameters to consider are thermal characteristics. Thermal design requires the following application-specific parameters: * Maximum ambient temperature, TA * Output Current, IOUT * Output Voltage, VOUT * Input Voltage, VIN First, we calculate the power dissipation of the regulator from these numbers and the device parameters from this datasheet. PD=IOUT(1.01VIN-VOUT) Where the ground current is approximated by 1% of IOUT. Then the heat sink thermal resistance is determined with this formula: Where TJ MAX≤ 125℃ and ΘCS is between 0 and 2℃/W. Capaitor Requirements For stability and minimum output noise,a capacitor on the regulator output is necessary. The value of this capacitor is dependent upon the output current; lower currents allow smaller capcitors. LM29150 regulators are stable with the 10uF minimum capacitor values at full load. Where the regulator is powered from a source with a high AC impedance, a 0.1uF capacitor connected between input and GND is recommended. This capacitor should have good characteristics to above 250kHz. Mar. 2006-Rev06 HTC 97 |
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