SG7800A/SG7800 SERIES SG7800A/SG7800 POSITIVE FIXED VOLTAGE REGULATOR DESCRIPTION FEATURES The SG7800A/SG7800 series of positive regulators offer self contained, Output voltage set internally to 1.5% on SG7800A fixed-voltage capability with up to 1.5A of load current and input voltage up Input voltage range to 50V max. on SG7800A to 50V (SG7800A series only). These units feature a unique on-chip Two volt input-output differential trimming system to set the output voltages to within 1.5% of nominal on the Excellent line and load regulation SG7800A series, 2.0% on the SG7800 series. The SG7800A versions also Foldback current limiting offer much improved line and load regulation characteristics. Utilizing an Thermal overload protection improved Bandgap reference design, problems have been eliminated that Voltages available: 5V, 12V, 15V are normally associated with the Zener diode references, such as drift in Available in surface mount package output voltage and large changes in the line and load regulation. HIGH RELIABILITY FEATURES All protective features of thermal shutdown, current limiting, and safe-area - SG7800A/7800 control have been designed into these units and since these regulators require only a small output capacitor for satisfactory performance, ease of Available to MIL-STD - 883 application is assured. MIL-M38510/10702BXA - JAN7805T MIL-M38510/10703BXA - JAN7812T Although designed as fixed-voltage regulators, the output voltage can be MIL-M38510/10704BXA - JAN7815T increased through the use of a simple voltage divider. The low quiescent MIL-M38510/10706BYA - JAN7805K drain current of the device insures good regulation when this method is used. MIL-M38510/10707BYA - JAN7812K MIL-M38510/10708BYA - JAN7815K Product is available in hermetically sealed TO-257, TO-3, TO39 and LCC Radiation data available packages. LMI level processing available SCHEMATIC DIAGRAM * * For normal operation the (V ) sense pin must be externally connected to the load. OS 05/01 Rev 1.4 LINFINITY Microelectronics Inc. Copyright 1997 11861 Western Avenue Garden Grove, CA 92841 1 (714) 898-8121 FAX: (714) 893-2570SG7800A/SG7800 SERIES POSITIVE REGULATOR ABSOLUTE MAXIMUM RATINGS (Note 1) Device Input Voltage Input Voltage Differential Output Voltage Input Voltage (transient) (Note 3) (Output shorted to ground) 5V 35V 50V 35V 12V 35V 50V 35V 15V 35V 50V 35V Operating Junction Temperature Storage Temperature Range .......................... -65C to 150C Hermetic (K, T, IG & L - Packages) ......................... 150C Lead Temperature (Soldering, 10 Seconds) ................. 300C Note 1. Values beyond which damage may occur. THERMAL DATA K Package: Note A. Junction Temperature Calculation: T = T + (P x ). Thermal Resistance-Junction to Case, ................. 3.0C/W J A D JA JC Note B. The above numbers for are maximums for the limiting thermal JC Junction to Ambient, ............... 35C/W Thermal Resistance- JA resistance of the package in a standard mounting configuration. T Package: The numbers are meant to be guidelines for the thermal JA Thermal Resistance-Junction to Case, .................. 15C/W JC performance of the device/pc-board system. All of the above Thermal Resistance-Junction to Ambient, ............ 120C/W assume no ambient airflow. JA IG Package: Junction to Case, ................. 3.5C/W Thermal Resistance- JC Thermal Resistance-Junction to Ambient, .............. 42C/W JA L Package: Thermal Resistance-Junction to Case, .................. 35C/W JC Thermal Resistance-Junction to Ambient, ............ 120C/W JA RECOMMENDED OPERATING CONDITIONS (Note 2) Operating Junction Temperature Range: SG7800A/SG7800 ........................................ -55C to 150C Note 2. Range over which the device is functional. CHARACTERISTIC CURVES Note 3. Operation at high input voltages is dependent upon load current. When load current is less than 5mA, output will rise out of regulation as input- oiutput differential icreases beyond 30V. Note also from Figure 1, that maximum load current is reduced at high voltages. The 50V input rating of the SG140A series refers to ability to withstnd high line or transient conditions without damage. Since the regulator s maximum current capability is reduced, the output may fall out of regulation at high input voltages under nominal loading. FIGURE 1. PEAK OUTPUT CURRENT VS. INPUT - OUTPUT DIFFERENTIAL 05/01 Rev 1.4 LINFINITY Microelectronics Inc. Copyright 1997 11861 Western Avenue Garden Grove, CA 92841 2 (714) 898-8121 FAX: (714) 893-2570