AMC317

 1.2A / 3-TERMINAL ADJUSTABLE REGULATOR ( 7 Page)

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 2 page AMC317Copyright© 2006 ADDtek Corp.2DD011_G--MARCH 2007TYPICAL APPLICATIONNote 1: CIN is required if the regulator is far from the filter capacitor.Note 2: COUT is recommended to improve the transient response.R2Note 3: VOUT = 1.25V( 1 +R1) + IADJ (R2)ABSOLUTE MAXIMUM RATINGS(Note 1)Input-Output Differential Voltage VD……………..…………………………………………………………..20VOperating Junction temperaturePlastic (T, ST Package) …………………………………………………………………………………… 150°CStorage Temperature Range ………………………………………………………………………. -65°C to 150°CLead temperature (Soldering, 10 seconds) ………………………………………………………………….. 300°CNote 1:Exceeding these ratings could cause damage to the device.All voltages are with respect to Ground.Currents are positive into,negative out of the specified terminal.THERMAL DATAT, ST PACKAGE:Thermal Resistance-Junction to Tab,θJT3.0°C /WThermal Resistance-Junction to Ambient,θJA45°C /WJunction Temperature Calculation:TJ = TA + (PD × θJA).TheθJA numbers are guidelines for the thermal performance of the device/pc-board system.All of the above assume no ambient airflow.Maximum Power Calculation:TJ(MAX) – TA(MAX)PD(MAX)=θJATJ(OC): Maximum recommended junction temperatureTA(OC): Ambient temperature of the applicationθJA(OC/W): Junction-to-junction temperature thermal resistance of the package, and other heat dissipating materials.The maximum power dissipation for a single-output regulator is :PD(MAX) = [(VIN(MAX) - VOUT(NOM))] × IOUT(NOM) + VIN(MAX) × IQWhere:VOUT(NOM) = the nominal output voltageIOUT(NOM) = the nominal output current, andIQ = the quiescent current the regulator consumes at IOUT(MAX)VIN(MAX) = the maximum input voltageThenθJA = (150OC – TA)/PDAMC317VOUTCOUT1µFCIN0.1µFVINR1240ΩR25KADJ