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ILC7083 Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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ILC7083 Datasheet(HTML) 6 Page - Fairchild Semiconductor |
6 / 16 page ILC7083/ILC7084 6 REV. 1.0.9 1/28/03 Shutdown (ON/OFF) Operation The ILC7083/ILC7084 output can be turned off by applying 0.6V or less to the device’s ON/OFF pin (pin 3). In shutdown mode, the ILC7083/ILC7084 draws less than 1µA quiescent current. In shutdown mode the output of ILC7083 is coupled to a low impedance circuit which discharges the output capacitor. The output of the ILC7083/ILC7084 is enabled by applying 1.5V to 13V at the ON/OFF pin. In applications where the ILC7083 output will always remain enabled, the ON/OFF pin may be connected to VIN (pin 1). The ILC7083/ ILC7084’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 ILC7083/ILC7084 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 ILC7083/ILC7084 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 dif- ferential 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 5 shows how an adjustable output voltage can be eas- ily achieved using ILC7083/ILC7084-ADJ. The output volt- age, VOUT is given by the following equation: VOUT = 1.255V 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 that an external capacitor should not be connected to the adjustable feedback pin (pin 4). Connecting an external capacitor to pin 4 may cause regulator instabil- ity and lead to oscillations. ILC7083-ADJ or ILC7084-ADJ V OUT V IN C OUT SOT23-5 C IN R1 R2 ON OFF 12 3 4 5 V ADJ Figure 2. ILC7083 RF LDO Regulator Block Diagram ON/OFF GND V OUT V IN C NOISE FEEDBACK BANDGAP REFERENCE V REFD ERROR AMPLIFIER TRANS- CONDUCTANCE AMPLIFIER INTERNAL V DD |
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