Data Sheet 3-TERMINAL POSITIVE LINEAR REGULATOR AZ78LXX General Description Features The AZ78LXX series are three terminal positive regu- Output Current up to 100mA lators with several fixed output voltages. These regula- Fixed Output Voltages of 5V, 8V, 9V and 12V tors can provide local on card regulation, eliminating Output Voltage Tolerances of 5% over the Full the distribution problems associated with single point Temperature Range regulation. The AZ78LXX can be used in logic sys- Internal Short Circuit Current-limiting tems, instrumentation, HiFi, and other solid state elec- Internal Thermal Overload Protection tronic equipment. When used as a Zener diode/resistor No External Components combination replacement, the AZ78LXX usually results an effective output impedance improvement of two orders of magnitude, and lower quiescent current. Applications With adequate heat sinking the AZ78LXX can deliver High Efficiency Linear Regulator 100mA output current. Current limiting is included to Post Regulation for Switching Supply limit the peak output current to a safe value. Thermal Microprocessor Power Supply protection is also provided. If internal power Mother Board I/O Power Supply dissipation becomes too high for the heat sinking provided, the thermal shutdown circuit takes over preventing the IC from overheating. The AZ78LXX are available in the plastic TO-92 (bulk or ammo packing), SOT-223 and SOT-89 pack- ages. TO-92(Bulk Packing) TO-92(Ammo Packing) SOT-89 SOT-223 Figure 1. Package Types of the AZ78LXX Nov. 2012 Rev. 2. 2 BCD Semiconductor Manufacturing Limited 1 Data Sheet 3-TERMINAL POSITIVE LINEAR REGULATOR AZ78LXX Pin Configuration Z Package Z Package (TO-92(Ammo Packing)) (TO-92(Bulk Packing)) INPUT 3 3 INPUT 2 GND 2 GND 1 OUTPUT OUTPUT 1 R Package H Package (SOT-89) (SOT-223) 3 INPUT 3 INPUT 4 2 GND GND 2 GND 4 GND 1 OUTPUT 1 OUTPUT Connect pin 4 to pin 2 or leave pin 4 electrically isolated Figure 2. Pin Configuration of the AZ78LXX (Top View) Nov. 2012 Rev. 2. 2 BCD Semiconductor Manufacturing Limited 2