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ADP1754 Datasheet(PDF) 6 Page - Analog Devices |
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ADP1754 Datasheet(HTML) 6 Page - Analog Devices |
6 / 19 page Data Sheet ADP1762 Rev. 0 | Page 5 of 18 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter Rating VIN to GND −0.3 V to +2.16 V EN to GND −0.3 V to +3.96 V VOUT to GND −0.3 V to VIN SENSE to GND −0.3 V to VIN VREG to GND −0.3 V to VIN REFCAP to GND −0.3 V to VIN VADJ to GND −0.3 V to VIN SS to GND −0.3 V to VIN PG to GND −0.3 V to +3.96 V Storage Temperature Range −65°C to +150°C Operating Temperature Range −40°C to +125°C Operating Junction Temperature 125°C Lead Temperature (Soldering, 10 sec) 300°C 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 operating conditions for extended periods may affect product reliability. THERMAL DATA Absolute maximum ratings apply only individually, not in combination. The ADP1762 may be damaged when junction temperature limits are exceeded. Monitoring ambient temperature does not guarantee that the junction temperature is within the specified temperature limits. In applications with high power dissipation and poor thermal resistance, the maximum ambient temperature may need to be derated. In applications with moderate power dissipation and low printed circuit board (PCB) thermal 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). TJ is calculated using the following formula: TJ = TA + (PD × θJA) The junction to ambient thermal resistance (θJA) of the package is based on modeling and a 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 circuit board. For details about board construction, refer to JEDEC JESD51-7. ΨJB is the junction to board thermal characterization parameter with units of °C/W. ΨJB of the package is based on modeling and a calculation using a 4-layer board. The JEDEC JESD51-12 document, Guidelines for Reporting and Using Package Thermal Information, states that thermal characterization parameters are not the same as thermal resistances. ΨJB measures the component power flowing 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. The maximum junction temperature (TJ) is calculated from the board temperature (TB) and power dissipation (PD), using the following formula: TJ = TB + (PD × ΨJB) Refer to the JEDEC JESD51-8 and JESD51-12 documents 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 5. Thermal Resistance for a 4-Layer 6400 mm2 Copper Size Package Type θJA ΨJB Unit 16-Lead LFCSP 56 28.4 °C/W ESD CAUTION |
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