MC34268 Voltage Regulator - SCSI-2 Active Terminator, Low Dropout 800 mA, 2.85 V MC34268 MAXIMUM RATINGS Rating Symbol Value Unit Power Supply Input Voltage V 15 V in Power Dissipation and Thermal Characteristics DT Suffix, Plastic Package, Case 369A T = 25C, Derate Above T = 25C P Internally Limited W A A D Thermal Resistance, JunctiontoCase R 5.0 C/W JC Thermal Resistance, JunctiontoAir R 87 C/W JA D Suffix, Plastic Package, Case 751 T = 25C, Derate Above T = 25C P Internally Limited W A A D Thermal Resistance, JunctiontoCase R 22 C/W JC Thermal Resistance, JunctiontoAir R 140 C/W JA ST Suffix, Plastic Package, Case 318E T = 25C, Derate Above T = 25C P Internally Limited W A A D Thermal Resistance, JunctiontoCase R 15 C/W JC Thermal Resistance, JunctiontoAir R 245 C/W JA Operating Ambient Temperature Range T 0 to +125 C A Maximum Die Junction Temperature T +150 C J Storage Temperature T 55 to +150 C stg Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. ELECTRICAL CHARACTERISTICS (V = 4.25 V, C = 10 F, for typical values T = 25C, for min/max values T = 0C to +125C, unless otherwise noted.) in O A A Characteristic Symbol Min Typ Max Unit Output Voltage (T = 25C, I = 0 mA) V 2.81 2.85 2.89 V A O O Output Voltage, over Line, Load, and Temperature (V = 3.9 V to 15 V, 2.76 2.85 2.93 in I = 0 mA to 490 mA) O Line Regulation (V = 4.25 V to 15 V, I = 0 mA, T = 25C) Reg 0.3 % in O A line Load Regulation (I = 0 mA to 800 mA, T = 25C) Reg 0.5 % O A load Dropout Voltage (I = 490 mA) V V 0.95 1.1 V O in O Ripple Rejection (f = 120 Hz) RR 55 dB Maximum Output Current (V = 5.0 V) I 800 mA in (max) Bias Current (V = 4.25 V, I = 0 mA) I 5.0 to 3.0 8.0 mA in O B Minimum Load Current to maintain Regulation (V = 15 V) I 0 mA in L(min) 1.5 T = 25C J 1.3 V = 5.0 V in 1.1 C = 10 F O T = 25C A 0.9 0.7 0.5 0 200 400 600 800 1000 20 ms/DIV I , OUTPUT LOAD CURRENT (mA) O Figure 1. Dropout Voltage versus Figure 2. Transient Load Regulation Output Load Current