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ADP172ACBZ-2.2-R7 数据表(PDF) 5 Page - Analog Devices |
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ADP172ACBZ-2.2-R7 数据表(HTML) 5 Page - Analog Devices |
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5 / 17 page ![]() Data Sheet ADP172 ABSOLUTE MAXIMUM RATINGS analog.com Rev. F | 5 of 17 Table 3. Parameter Rating VIN to GND −0.3 V to +4.0 V VOUT to GND −0.3 V to VIN EN to GND −0.3 V to +4.0 V Storage Temperature Range −65°C to +150°C Operating Junction Temperature Range −40°C to +125°C Operating Ambient Temperature Range −40°C to +85°C Soldering Conditions JEDEC J-STD-020 Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operat- ing conditions for extended periods may affect product reliability. THERMAL DATA Absolute maximum ratings apply only individually, not in combina- tion. The ADP172 can be damaged when the junction temperature limits are exceeded. Monitoring ambient temperature does not guarantee that TJ is within the specified temperature limits. In appli- cations with high power dissipation and poor thermal resistance, the maximum ambient temperature may have to be derated. In applications with moderate power dissipation and low PCB ther- mal resistance, the maximum ambient temperature can exceed the maximum limit as long as the junction temperature is within specification limits. The junction temperature (TJ) of the device is dependent on the ambient temperature (TA), the power dissipation of the device (PD), and the junction-to-ambient thermal resistance of the package (θJA). Maximum junction temperature (TJ) is calculated from the ambient temperature (TA) and power dissipation (PD) using the following formula: TJ = TA + (PD × θJA) Junction-to-ambient thermal resistance (θJA) of the package is based on modeling and calculation using a 4-layer board. The junction-to-ambient thermal resistance is highly dependent on the application and board layout. In applications where high maximum power dissipation exists, close attention to thermal board design is required. The value of θJA may vary, depending on PCB material, layout, and environmental conditions. The specified values of θJA are based on a 4-layer, 4 in. × 3 in. PCB. Refer to JESD51-7 for detailed information regarding board construction. ΨJB is the junction-to-board thermal characterization parameter with units of °C/W. The ΨJB of the package is based on modeling and calculation using a 4-layer board. The Guidelines for Reporting and Using Electronic Package Thermal Information: JESD51-12 states that thermal characterization parameters are not the same as thermal resistances. ΨJB measures the component power flow- ing through multiple thermal paths rather than a single path as in thermal resistance, θJB. Therefore, ΨJB thermal paths include convection from the top of the package as well as radiation from the package—factors that make ΨJB more useful in real-world applications. Maximum junction temperature (TJ) is calculated from the board temperature (TB) and power dissipation (PD) using the formula TJ = TB + (PD × ΨJB) Refer to JESD51-8 and JESD51-12 for more detailed information about ΨJB. THERMAL RESISTANCE θJA and ΨJB are specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 4. Thermal Resistance Package Type θJA ΨJB Unit 4-Ball, 0.5 mm Pitch WLCSP 260 58 °C/W ESD CAUTION ESD (electrostatic discharge) sensitive device. Charged devi- ces and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. |
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