LM79M05CT

www.fairchildsemi.com LM79MXX 3-Terminal 0.5A Negative Voltage Regulator Features • • • • • • No External Components Required Output Current in Excess of 0.5A Internal Thermal Overload Internal Short Circuit Current Limiting Output Transistor Safe Area Compensation Output Voltages of -5V, -6V, -8V, -12V, -15V , -18V and 24V Description The LM79MXX series of 3-Terminal medium current negative voltage regulators are monolithic integrated circuits designed as fixed voltage regulators. These regulators employ internal current limiting, thermal shutdown and safe area compensation making them essentially indestructible. TO-220 1 1. GND 2. Input 3. Output Schematic Diagram GND R2 Q8 D1 D2 D3 Q12 R1 R3 Q10 Q9 R4 Q11 R5 R8 Q14 Q16 R13 R7 D5 Q18 Q2 Q3 Q17 Q24 Q25 Q5 Q1 Q4 Q6 Q7 Q19 R24 R25 Q20 R19 R18 C1 C2 R17 D4 Q23 Q26 R20 Q21 Q22 R21 R22 Q27 R23 R16 R6 Q13 R9 Q15 R12 R14 R10 R11 R15 OUT IN Rev. 1.0.3 ©2009 Fairchild Semiconductor Corporation LM79MXX Absolute Maximum Ratings Parameter Input Voltage(for VO = -5V to -18V) (for VO = -24V) Thermal Resistance Junction-Cases Thermal Resistance Junction-Air Operating Temperature Range Storage Temperature Range Symbol VI VI RθJC RθJA TOPR TSTG Value -35 -40 5 65 0 ~ +125 -65 ~ +150 Unit V V °C/W °C/W °C °C Electrical Characteristics (LM79M05) (Refer to test circuit, 0°C ≤TJ ≤ +125°C, lO =350mA, VI = -10V,unless otherwise specified, CI =0.33μF,CO=0.1μF) Parameter Output Voltage Symbol VO Conditions TJ = +25°C IO = 5mA to 350mA VI = -7V to -25V TJ =+25°C VI = -7V to -25V VI = -8V to -25V Min. -4.8 -4.75 54 Typ. -5 -5 7.0 2.0 30 3.0 -0.2 40 60 1.1 140 650 Max. -5.2 -5.25 50 30 100 6.0 0.4 0.4 mA mV/°C μV dB V mA mA V Unit Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Output Voltage Drift Output Noise Voltage Ripple Rejection Dropout Voltage Short Circuit Current Peak Current Δ VO Δ VO IQ ΔIQ ΔVo/ΔT VN RR VD ISC IPK mV mV mA IO = 5mA to 500mA TJ = +25°C TJ = +25°C IO = 5mA to 350mA IO = 200mA VI = -8V to -25V IO = 5mA f = 10Hz, 100kHz TA = +25°C f = 120Hz VJ = -8 to -18V TJ =+25°C, IO = 500mA TJ = +25°C, VI = -35V TJ = +25°C Note: 1. Load and line regulation are specified at constant junction temperature. Change in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 2 LM79MXX Typical Applications VI 2 LM79MXX 1 3 VO 2.0uF 1.0uF Figure 1. Fixed Output Regulator VI LM79MXX VO R1 C1 _ 2.2uF SOLID + TANTALUM _ 1uF _ + C2 25uF R2 + C3 SOLID TANTALUM Figure 2. Variable Output Notes: 1. Required for stability. For value given, capacitor must be solid tantalum. 25μF aluminum electrolytic may be substituted. 2. C2 improves transient response and ripple rejection. Do not increase beyond 50μF. 3 LM79MXX Mechanical Dimensions Package Dimensions in millimeters TO-220 [ SINGLE GAUGE ] 4 LM79MXX Ordering Information Product Number LM79M05CT Package TO-220 Operating Temperature 0 ~ +125°C DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 7/6/09 0.0m 001 Stock#DS903555 © 2009 Fairchild Semiconductor Corporation 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.