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LM1185SF Datasheet(PDF) 3 Page - HTC Korea TAEJIN Technology Co. |
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LM1185SF Datasheet(HTML) 3 Page - HTC Korea TAEJIN Technology Co. |
3 / 4 page 150 mA C-MOS L.D.O. Regulator LM1185SF Typical Application Circuit Detail Description 0702 Taejin Technology Co.,Ltd. HTC 3 1. Output Capacitor 1uF(min) capacitor from VOUT to Gnd is required. The output capacitor hould have an effective series resistance greater than 0.1 Ω and less than .0Ω. 1uF capacitor should be connected from VIN to GND if there is more than 10 inche sofwire between the regulator and the AC filter capacitor ,or if a battery is used as the power source. Aluminum electrolytic or tantalum capacitor types can be used. (Since many aluminum electrolytic capacitors freeze at approximately -30°C, solid tantalums are recommended for applications operating below -25° C.) When operating from sources other than batteries,supply-noise rejection and transient response can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques. 2. Bypass Input 470pF capacitor connected from the Bypass input to ground reduces noise present on the internal reference,which in turn significantly reduces output noise. If output noise is not aconcern, this input maybe left unconnected. Larger capacitor values maybe used,but results in alonger time period to rated output voltage when power is initially applied. 3. THERMAL CONSIDERATIONS 3.1 Thermal Shutdown Integrated thermal protection circuitry shuts the regulator off when die temperature exceeds150°C. The regulator remains off until the die temperature drops to approxi mately 140°C. 3.2 Power Dissipation The amount of power the regulator dissipate is primarily a function of input and output voltage, and output current. The following equation is used to calculate worst case actual power dissipation: Vin (To CMOS Logic or Tie to Vin if unused) Gnd BP + 1uF • SHDN Vout + Battery Vout + 470pF Reference Bypass Cap(Optional) + 1uF • |
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