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LTC4052-4.2 Datasheet(PDF) 9 Page - Linear Technology |
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LTC4052-4.2 Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page LTC4052-4.2 9 405242f In addition, feedthrough vias or plated through holes (lo- cated directly beneath the package and elsewhere) connect- ing internal copper and backside copper layers help transfer and spread the heat generated by the package. Calculating Junction Temperature Example: Find the maximum junction temperature for a battery voltage of 4V (VIN will collapse to approximately VBAT in the full charge mode), charge current of 1A and a maximum ambient temperature of 75 °C. The power dissipated by the IC is: P= (IBAT • IBAT • RDS(ON)) + (VIN • IIN) = (1A • 1A • 0.35 Ω) + (4V • 0.7mA) = 0.35 + 0.003 = 0.353W The LTC4052 is available in an enhanced 8-pin MSOP package which features an exposed copper pad on the bottom of the package allowing it to be soldered directly to the PC board copper for maximum heat transfer. This greatly reduces the thermal resistance and increases the power handling capability when compared to a standard MSOP package. The junction to ambient thermal resis- tance of this package when the backside of the package is APPLICATIO S I FOR ATIO soldered to the PC board is approximately 35 °C/W de- pending on the copper area. The junction temperature rise above ambient will be approximately: (0.353W)(35 °C/W) = 12.36°C The maximum junction temperature will be equal to the maximum junction temperature rise above ambient plus the maximum ambient temperature or: TJMAX = 85°C + 12.36°C = 97.36°C ACPR Output Pin When the input voltage is 45mV higher than the voltage at the BAT pin, the ACPR pin is pulled to ground to indicate that the input supply (wall adapter) is applied. After the input supply is removed, this pin will become high imped- ance. An internal 100ms filter prevents the LTC4052 from turning off if the voltage at the VIN pin rings and gets too close to VBAT due to parasitic inductance. Stop Charging The charger is off when the voltage at the VIN pin is less than 45mV above VBAT (sleep mode). The charge pump and the internal pass transistor are turned off, and the internal resistor divider is disconnected to reduce the current drain on the battery in the sleep mode. |
Similar Part No. - LTC4052-4.2_15 |
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Similar Description - LTC4052-4.2_15 |
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