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TJ4230GR-1.2V-5L Datasheet(PDF) 8 Page - HTC Korea TAEJIN Technology Co. |
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TJ4230GR-1.2V-5L Datasheet(HTML) 8 Page - HTC Korea TAEJIN Technology Co. |
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8 / 9 page  3A Ultra Low Dropout Linear Regulator TJ4230 Apr. 2011 – Rev. 1. 0 8/9 HTC where TJ is the junction temperature, TC is the case temperature, TA is the ambient temperature, PD is the total power dissipation of the device, θCA is the thermal resistance of case-to-ambient, θJC is the thermal resistance of junction-to-case, and θJA is the thermal resistance of junction to ambient. The total power dissipation of the device is given by: PD = PIN – POUT = (VIN X IIN)–(VOUT X IOUT) = (VIN X (IOUT+IGND)) – (VOUT X IOUT) = (VIN - VOUT) X IOUT + VIN X IGND where IGND is the operating ground current of the device which is specified at the Electrical Characteristics. The maximum allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax) of the application, and the maximum allowable junction temperature (TJmax): TRmax = TJmax – TAmax The maximum allowable value for junction-to-ambient thermal resistance, θJA, can be calculated using the formula: θJA = TRmax / PD TJ4230 is available in SOP8-PP, TO252 and TO263 packages. The thermal resistance depends on amount of copper area or heat sink, and on air flow. If proper cooling solution such as heat sink, copper plane area, or air flow is applied, the maximum allowable power dissipation could be increased. However, if the ambient temperature is increased, the allowable power dissipation would be decreased. The graph above is valid for the thermal impedance specified in the Absolute Maximum Ratings section on page 1. |
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