LT1085LCC4 MILITARY VERSION MECHANICAL DATA Dimensions in mm (inches) CERAMIC SURFACE MOUNT LOW DROPOUT POSITIVE ADJUSTABLE VOLTAGE REGULATOR FOR HI-REL APPLICATIONS 9.14 (0.360) 8.64 (0.340) 1.27 (0.050) 1.07 (0.040) 2.16 (0.085) 12 13 14 15 16 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) 1.39 (0.055) 1.02 (0.040) 7.62 (0.300) 7.12 (0.280) 11 17 10 18 9 1 8 2 7 6 5 1.39 (0.055) 1.15 (0.045) 4 BLOCK DIAGRAM VIN 0.76 (0.030) 0.51 (0.020) 0.33 (0.013) Rad. 0.08 (0.003) 3 1.65 (0.065) 1.40 (0.055) 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 ABSOLUTE MAXIMUM RATINGS VI-O Input-Output Differential Voltage PD Power Dissipation VIN Operating Input Voltage TJ Operating Junction Temperature Range TSTG Storage Temperature Range JC Thermal Resistance (junction to case) VADJ VOUT (Tcase = 25C unless otherwise stated) 30V Internally limited 25V Control -55 to 150C Power -55 to 200C -65 to 150C 13C/W * 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 reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use. Semelab encourages customers to verify that datasheets are current before placing orders. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk Document Number 3871 Issue 2 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 Test Conditions VIN - VOUT = 3V VREF Reference Voltage (TJ = 25C unless otherwise stated) IO = 10mA VIN - VOUT = 1.5 to 15V IO = 10mA to 3A TJ = -55 to 125C REG(LINE) Line Regulation IO = 10mA Min. Typ. Max. Unit 1.238 1.250 1.252 1.225 1.25 1.270 0.015 0.2 (VIN-VOUT) = 1.5 to 15V TJ = -55 to 125C % IO = 10mA (VIN-VOUT) = 15 to 30V 0.5 TJ = -55 to 125C REG(LOAD) Load Regulation VD 0.3 0.2 0.4 1.3 1.5 Dropout Voltage VREF = 1% See note 3 IOUT = 3A TJ = -55 to 125C VIN - VOUT = 5V TJ = -55 to 125C 3.2 4 VIN - VOUT = 25V TJ = -55 to 125C 0.2 0.5 VIN - VOUT = 5V TJ = -55 to 125C TP = 30ms f = 120Hz TA = 25C VIN - VOUT = 3V IO = 3A CADJ = 25F IQ Quiescent Current Minimum Load Current 4 REG(THERM) Thermal Regulation RA Ripple Rejection IPIN Adjust Pin Current IPIN Adjust Pin Current Change TS Temperature Stability TJ = -55 to 125C 0.1 IO = 10mA to 3A Current Limit VN VIN - VOUT = 3V See notes 1,2 ICL TJ = -55 to 125C VIN - VOUT = 1.5 to 15V IO = 10mA to 3A TJ = -55 to 125C Long Term Stability TJ = -55 to 125C TA = 125C T = 1000 Hrs RMS Output Noise f = 10Hz to 10kHz TA = 25C V 60 % V A 5 10 mA 0.004 0.04 %/W dB 75 55 120 A 0.2 5 A 0.5 % 0.3 % 0.003 % 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 reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use. Semelab encourages customers to verify that datasheets are current before placing orders. Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612. E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk Document Number 3871 Issue 2