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ILC7080AIM5-30 Datasheet(PDF) 6 Page - Impala Linear Corporation |
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ILC7080AIM5-30 Datasheet(HTML) 6 Page - Impala Linear Corporation |
6 / 16 page 50/100mA SOT-23 CMOS RF LDO™ Regulators Impala Linear Corporation 6 (408) 574-3939 www.impalalinear.com Sept. 1998 ILC7080/81 1.1 ON/OFF GND V OUT V IN C NOISE FEEDBACK BANDGAP REFERENCE V REF ERROR AMPLIFIER TRANS- CONDUCTANCE AMPLIFIER INTERNAL V DD Figure 2: ILC7080/81 RF LDO regulator block digram 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 1mA 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. The device’s shutdown pin includes a 2M Ω internal pull down resistor connected to ground. Short Circuit Protection The ILC7080/81 output can withstand momentary short cir- cuit 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 170°C due to overheating. In thermal shutdown, once the die temperature cools to below 160°C, the regula- tor is enabled. If the die temperature is excessive due to high package power dissipation, the regulator’s thermal cir- cuit 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 3 shows how an adjustable output voltage can be easily achieved using ILC7080/81-ADJ. The output voltage, VOUT is given by the following equation: VOUT = 1.24V x (R1/R2 + 1) 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. ILC7080-ADJ ILC7081-ADJ V OUT V IN C OUT SOT23-5 C IN R1 R2 ON OFF 12 3 4 5 V ADJ Figure 3: Application circuit for adjustable output voltage |
Similar Part No. - ILC7080AIM5-30 |
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Similar Description - ILC7080AIM5-30 |
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