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ILC7082AIM5-30 Folha de dados(PDF) 6 Page - Impala Linear Corporation |
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ILC7082AIM5-30 Folha de dados(HTML) 6 Page - Impala Linear Corporation |
6 / 16 page 150mA SOT-23 Ultra Low Noise CMOS RF-LDO™ Regulator Impala Linear Corporation 6 (408) 574-3939 www.impalalinear.com April 1999 ILC7082 1.3 Shutdown (ON/OFF) Operation The ILC7082 output can be turned off by applying 0.4V or less to the device’s ON/OFF pin (pin 3). In shutdown mode, the ILC7082 draws less than 1mA quiescent current. The output of the ILC7081 is enabled by applying 1.5V to 13V at the ON/OFF pin. In applications were the ILC7082 output will always remain enabled, the ON/OFF pin may be con- nected to VIN (pin 1). The ILC7082’s shutdown circuitry includes hysteresis, as such the device will operate proper- ly even if a slow moving signal is applied to the ON/OFF pin. The device’s shutdown pin includes a 2MW internal pull down resistor connected to ground. Short Circuit Protection The ILC7082 output can withstand momentary short circuit to ground. Moreover, the regulator can deliver very high out- put peak current due to its 1A instantaneous short circuit current capability. Thermal Protection The ILC7082 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 5 shows how an adjustable output voltage can be easily achieved using ILC7082-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 470kW 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 connect- ed to the adjustable feedback pin (pin 4). Connecting an external capacitor to pin 4 may cause regulator instability and lead to oscillations. Maximum Output Current The maximum output current available from the ILC7082 is limited by the maximum package power dissipation as well as the device’s internal current limit. For a given ambient temperature, T A, the maximum package power dissipation is given by: P D(MAX) = (TJ(MAX) - T A) / θJA where T J(MAX) = 150°C is the maximum junction temperature and θJA = 333°C/W is the package thermal resistance. For example at T A = 85°C ambient temperature, the maximum package power dissipation is; P D(MAX) = 195mW. The maximum output current can be calculated from the fol- lowing equation: I OUT(MAX) < PD(MAX) / (VIN - VOUT) For example at V IN = 6V, VOUT = 5V and TA = 85°C, the max- imum output current is I OUT(MAX) < 195mA. At higher output current, the die temperature will rise and cause the thermal protection circuit to be enabled. APPLICATION HINTS Figure 4 shows the typical application circuit for the ILC7082. ILC7082-ADJ V OUT V IN C OUT SOT23-5 C IN R1 R2 ON OFF 12 3 4 5 V ADJ Fig. 3: Application circuit for adjustable output voltage ELECTRICAL CHARACTERISTICS ILC7082AIM5 (continued) ILC7082 V OUT V IN C OUT SOT23-5 C IN ON OFF 12 3 4 5 C NOISE Figure 4: Basic application circuit for fixed output voltage versions |
Nº de peça semelhante - ILC7082AIM5-30 |
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Descrição semelhante - ILC7082AIM5-30 |
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