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ILC7081 Datasheet(PDF) 5 Page - Fairchild Semiconductor |
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ILC7081 Datasheet(HTML) 5 Page - Fairchild Semiconductor |
5 / 16 page ILC7080/81 REV. 1.0.7 4/3/03 5 Figure 2. ILC7080/81 RF LDO regulator block diagram ON/OFF GND V OUT V IN C NOISE FEEDBACK BANDGAP REFERENCE V REF ERROR AMPLIFIER TRANS- CONDUCTANCE AMPLIFIER INTERNAL V DD Shutdown (ON/OFF) Operation The ILC7080/81 output can be turned off by applying 0.4V or less to the device’s ON/OFF pin (pin 3). In shutdown mode, the ILC7080/81 draws less than 1µA quiescent cur- rent. The output of the ILC7081 is enabled by applying 2V to 13V at the ON/OFF pin. In applications where the ILC7080/ 81 output will always remain enabled, the ON/OFF pin may be connected to VIN (pin 1). The ILC7080/81’s shutdown circuitry includes hysteresis, as such the device will operate properly even if a slow moving signal is applied to the ON/ OFF pin. Short Circuit Protection The ILC7080/81 output can withstand momentary short circuit to ground. Moreover, the regulator can deliver very high output peak current due to its 1A instantaneous short circuit current capability. Thermal Protection The ILC7080/81 also includes a thermal protection circuit which shuts down the regulator when die temperature exceeds 150˚C due to overheating. In thermal shutdown, once the die temperature cools to below 140˚C, the regulator is enabled. If the die temperature is excessive due to high package power dissipation, the regulator’s thermal circuit will continue to pulse the regulator on and off. This is called thermal cycling. Excessively high die temperature may occur due to high differential voltage across the regulator or high load current or high ambient temperature or a combination of all three. Thermal protection protects the regulator from such fault conditions and is a necessary requirement in today’s designs. In normal operation, the die temperature should be limited to under 150˚C. Adjustable Output Voltage Figure 3 shows how an adjustable output voltage can be easily achieved using ILC7081-ADJ. The output voltage, VOUT is given by the following equation: VOUT = 1.24V x (R1/R2 + 1) Figure 3. Application circuit for adjustable output voltage For best results, a resistor value of 470k Ω or less may be used for R2. The output voltage can be programmed from 2.5V to 12V. Note: An external capacitor should not be connected to the adjustable feedback pin (pin 4). Connecting an external capacitor to pin 4 may cause regulator instability and lead to oscillations. ILC7081-ADJ V OUT V IN C OUT R1 SOT23-5 C IN ON OFF 12 3 4 5 V ADJ R2 |
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