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YB1901MXX8L Datasheet(PDF) 9 Page - YOBON TECHNOLOGIES,INC. |
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YB1901MXX8L Datasheet(HTML) 9 Page - YOBON TECHNOLOGIES,INC. |
9 / 12 page YB1901 2.0A High-Side Power Switch with Flag YB1901 Rev.1.2 www.yobon.com.tw 9 Thermal Considerations The YB1901 is designed to deliver a continuous load current. The maximum limit is package power dissipation. At any given ambient temperature, the maximum package power dissipation can be determined by the following equation: PD(MAX) = [ TJ(MAX) - TA ] / θJA Constraints for the YB1901 are maximum junction temperature TJ(MAX) = 125 , and ℃ package thermal resistance, θJA =280 / ℃ W. The maximum continuous output current for YB1901 depends on package power dissipation and the RDS(ON) of MOSFET at TJ(MAX). Typical conditions are calculated under normal ambient condition where TA = 25 . At 85 , P ℃℃ D(MAX) = 143mW. At TA = 25 , P ℃ D(MAX) = 357mW. The maximum current is calculated by the following equation: IOUT < (PD(MAX) / RDS(MAX)) 1/2 For example, if VIN = 5V, RDS(MAX) = 100mΩ and TA = 25 , I ℃ OUT(MAX) = 1.89A. Thermal Shutdown is employed to protect the device damage when temperature is over 120℃. PCB Layout Consideration To maximize YB1901 performance, some board layout rules should be followed: VIN and VOUT should be routed using wider than normal traces, and GND should be connected to a ground plane. For best performance, CIN and COUT should be placed close to the package pins. |
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