cs5258-1 ON Semiconductor, cs5258-1 Datasheet
cs5258-1
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cs5258-1 Summary of contents
Page 1
... This circuitry, which includes overcurrent, short circuit, supply sequencing and overtemperature protection, will self protect the regulator under all fault conditions. The CS5258−1 is ideal for generating a secondary 2.0−2.5 V low voltage supply on a motherboard where both 5.0 V and 3.3 V are already available. ...
Page 2
... This current will track output current with roughly a 1:100 CONTROL ratio. The minimum value is equal to the quiescent current of the device CONTROL OUT CS5258− POWER SENSE Adjust 100 μF 0.1 μ ...
Page 3
... ELECTRICAL CHARACTERISTICS (continued) otherwise specified.) Characteristic CS5258−1 Ripple Rejection (Note 5) V CONTROL V C Thermal Regulation 30 ms Pulse Dropout Voltage V CONTROL POWER (Minimum V − CONTROL OUT POWER (Note 6) V POWER V POWER V POWER V Dropout Voltage V POWER CONTROL (Minimum V − POWER ...
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V POWER V CONTROL BIAS and TSD TYPICAL PERFORMANCE CHARACTERISTICS 0.100 0.075 0.050 0.025 0 −0.025 −0.050 −0.075 −0.100 V = 2.75 V CONTROL V = 2.15 V −0.125 POWER −0.150 ...
Page 5
V = 2.75 V CONTROL 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0 1.0 2.0 3.0 4.0 5.0 Output Current (A) Figure 7. V Dropout Voltage vs I POWER 1200 V = 3.3 V POWER 1150 ...
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... The output can never come up unregulated. The CS5258−1 can also be used as a single supply device with the control and power inputs tied together. In this mode, the dropout will be determined by the minimum control voltage. ...
Page 7
... A 0.1 μF tantalum capacitor is recommended for “first cut” design. Value and type may be varied to optimize performance vs. price. Other Adjustable Operation Considerations The CS5258−1 linear regulator has an absolute maximum specification of 6.0 V for the voltage difference between V and V . However, the IC may be used to regulate voltages OUT in excess of 6 ...
Page 8
... The discharge current depends on the value of the capacitor, the output voltage, and the rate at which V the CS5258−1 regulator, the discharge path is through a large junction and protection diodes are not usually needed. If the regulator is used with large values of output capacitance and the input voltage is instantaneously shorted to ground, damage can occur ...
Page 9
... R QJA + R QJC ) R QCS ) R QSA The value for R TO−220 package. For a high current regulator such as the CS5258−1 the majority of heat is generated in the power transistor section. The value for R sink type, while the R package type, heat sink interface (is an insulator and thermal grease used?), and the contact area between the heat sink and the package ...
Page 10
... K 0.990 1.045 25.146 26.543 L 0.320 0.365 8.128 9.271 Q 0.140 0.153 3.556 3.886 U 0.105 0.117 2.667 2.972 Unit 1.4 °C/W 50 °C/W ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative CS5258−1/D ...