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| LT1085LCC4 MILITARY VERSION MECHANICAL DATA Dimensions in mm (inches) CERAMIC SURFACE MOUNT LOW DROPOUT POSITIVE ADJUSTABLE VOLTAGE REGULATOR FOR HI-REL APPLICATIONS FEATURES * Ceramic Surface Mount Hermetic Package * Low Dropout Performance * Output Current 3A * Line Regulation 0.015% / V Typical. * Load Regulation 0.1% Typical. * Full Temperature Range (-55 to +150C) 1.27 (0.050) 1.07 (0.040) 9.14 (0.360) 8.64 (0.340) 12 13 14 15 16 1.39 (0.055) 1.02 (0.040) 2.16 (0.085) 11 7.62 (0.300) 7.12 (0.280) 17 18 1 2 0.76 (0.030) 0.51 (0.020) 10 9 8 BLOCK DIAGRAM VIN 7 6 5 4 3 1.65 (0.065) 1.40 (0.055) 0.33 (0.013) Rad. 0.08 (0.003) 1.39 (0.055) 1.15 (0.045) 0.43 (0.017) 0.18 (0.007 Rad. THERMAL LIMIT LCC4 Pads 5,4 = adjust Pads 6,7,8,9,10,11,13 = Vin Pads 1,2,15,16,17,18 = Vout VADJ VOUT ABSOLUTE MAXIMUM RATINGS VI-O PD VIN TJ TSTG Input-Output Differential Voltage Power Dissipation Operating Input Voltage Operating Junction Temperature Range Storage Temperature Range Thermal Resistance (junction to case) (Tcase = 25C unless otherwise stated) 30V Internally limited 25V Control Power -55 to 150C -55 to 200C -65 to 150C 13C/W qJC * Although the devices' maximum operating voltage is limited to 25V the devices are guaranteed to withstand transient input voltages up to 30V. For input voltages greater than the maximum operating input voltage, some degradation of specifications will occur. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk Prelim. 8/00 LT1085LCC4 MILITARY VERSION DESCRIPTION The LT1085 is designed to provide 3A with higher efficiency than currently available devices. All internal circuitry is designed to operate down to 1V input to output differential and the dropout voltage is fully specified as a function of load current. Dropout is guaranteed at a maximum of 1.5V at maximum output current, decreasing at lower load currents. Onchip trimming adjusts the reference output voltage to 1%. Current limit is also trimmed, minimising the stress on both the regulator and power source circuitry under overload conditions. ELECTRICAL CHARACTERISTICS (Pre Irradiation) Parameter VREF Reference Voltage (TJ = 25C unless otherwise stated) Test Conditions VIN - VOUT = 3V IO = 10mA TJ = -55 to 125C VIN - VOUT = 1.5 to 15V IO = 10mA to 3A IO = 10mA (VIN-VOUT) = 1.5 to 15V TJ = -55 to 125C IO = 10mA (VIN-VOUT) = 15 to 30V TJ = -55 to 125C Min. 1.238 1.225 Typ. 1.250 1.25 0.015 Max. Unit 1.252 1.270 0.2 % 0.5 V REG(LINE) Line Regulation REG(LOAD) Load Regulation See notes 1,2 VD Dropout Voltage See note 3 ICL IQ Current Limit Quiescent Current Minimum Load Current 4 REG(THERM) Thermal Regulation RA IPIN Ripple Rejection Adjust Pin Current Adjust Pin Current Change Temperature Stability Long Term Stability VN RMS Output Noise VIN - VOUT = 3V IO = 10mA to 3A TJ = -55 to 125C TJ = -55 to 125C TJ = -55 to 125C TJ = -55 to 125C TJ = -55 to 125C TA = 25C VIN - VOUT = 3V CADJ = 25mF 3.2 0.2 0.1 0.2 1.3 4 0.5 5 0.004 60 75 55 0.2 0.5 T = 1000 Hrs TA = 25C 0.3 0.003 0.3 0.4 1.5 % V A DVREF = 1% IOUT = 3A VIN - VOUT = 5V VIN - VOUT = 25V VIN - VOUT = 5V TP = 30ms f = 120Hz IO = 3A 10 0.02 mA %/W dB DIPIN TS TJ = -55 to 125C VIN - VOUT = 1.5 to 15V IO = 10mA to 3A TJ = -55 to 125C TJ = -55 to 125C TA = 125C f = 10Hz to 10kHz 120 5 mA mA % % % Notes: 1 Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. 2 Power dissipation is determined by the input - output differential and the output current. Guaranteed maximum power 2 dissipation will not be available over the full input - output voltage range. 3 Dropout voltage is specified over the full output current range of the device. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk Prelim. 8/00 |
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