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GM6156-2.8ST25R Datasheet(PDF) 6 Page - Gamma Microelectronics Inc. |
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GM6156-2.8ST25R Datasheet(HTML) 6 Page - Gamma Microelectronics Inc. |
6 / 9 page 6 The actual power dissipation of the regulator circuit can be determined using by the equation: P = (V - V ) I + V I D IN OUT OUT IN GND Substituting P for P and solving for the operating conditions that are critical to the application will give D(max) D the maximum operating conditions for the regulator circuit. For example, when operating the GM6156 at room temperature with a minimum footprint layout, the maximum input voltage for a set output current can be determined as follows: The junction-to-ambient thermal resistance for the minimum footprint is 220°C/ W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. Using the output voltage of 3.3V and an output current of 150mA, the maximum input voltage can be determined. From the Electrical Characteristics table, the maximum ground current for150mA output current is 2500µ or 2.5mA. 455mW = (V - 3.3V) 150mA + V • 2.5mA IN IN 455mW = V • 150mA - 495mA + V • 2.5mA IN IN 950mW = V • 152.5mA IN V = 6.23V IN(max) Therefore, a 3.3V application at 150mA of output current can accept a maximum input voltage of 6.2V in a SOT-25 package. For a full discussion of heat sinking and thermal effects on voltage regulators. Fixed Regulator Applications Figure 3. Ultra-Low-Noise Fixed Voltage Application Figure 4. Low-Noise Fixed Voltage Application Adjustable Regulator Applications The GM6156 can be adjusted to a specific output voltage by using two externa resistors (Figure 5). The resistors set the output voltage based on the following equation: P = D(max) P = 455mW D(max) (125°C - 25°C) 220°C/W Figure3 includes a 470pF capacitor for low-noise operation and shows EN (pin 3) connected to IN (pin 1) for an application where enable/ shutdown is not required. C = 2.2µF minimum. OUT 1 2 3 4 5 VIN VOUT 2.2µF 470pF Enable Shutdown Figure 4 is an example of a low-noise configuration where C is not required. C = 1µF minimum. BYP OUT V = 1.242V X ( +1) OUT R2 R1 Parameter R Recommended JA q Minimum Footprint R 1" Square JA q Copper Clad R JC q SOT-23-5 220°C/ W 170°C/ W 130°C/ W Table 1. SOT-25 Thermal Resistance 1 2 3 4 5 VIN VOUT 1.0µF EN BYP |
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