www.fairchildsemi.com LM79XX 3-Terminal 1A Negative Voltage Regulator Features Description • Output Current in Excess of 1A • Output Voltages of -5, -6, -8 , -9, -10, -12, -15, -18 and 24V • Internal Thermal Overload Protection • Short Circuit Protection • Output Transistor Safe Operating Area Compensation The LM79XX series of three terminal negative regulators are available in TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut down and safe operating area protection, making it essentially indestructible. TO-220 Vin 1 1. GND 2. Input 3. Output Internal Block Digram GND R1 VOLTAGE REFERENCE R2 Output Out + Q1 Q2 I1 I2 PROTECTION CIRCUITRY Rsc In Input Rev. 1.0.2 ©2009 Fairchild Semiconductor Corporation LM79XX Absolute Maximum Ratings Parameter Symbol Value Unit VI -35 V Thermal Resistance Junction-Case (Note1) RθJC 5 Thermal Resistance Junction-Air (Note1, 2) RθJA 65 Operating Temperature Range TOPR 0 ~ +125 °C Storage Temperature Range TSTG -65 ~ +150 °C Input Voltage °C/W Note: 1. Thermal resistance test board Size: 76.2mm * 114.3mm * 1.6mm(1S0P) JEDEC standard: JESD51-3, JESD51-7 2. Assume no ambient airflow Electrical Characteristics (LM7905) (VI = -10V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.) Parameter Output Voltage Line Regulation (Note3) Load Regulation (Note3) Quiescent Current Quiescent Current Change Temperature Coefficient of VD Symbol VO ΔVO ΔVO IQ ΔIQ ΔVo/ΔT Conditions Min. Typ. Max. TJ = +25°C -4.8 -5.0 -5.2 IO = 5mA to 1A, PO ≤ 15W VI = -7V to -20V -4.75 -5.0 -5.25 VI = -7V to -25V - 35 100 VI = -8V to -12V - 8 50 TJ = +25°C IO = 5mA to 1.5A - 10 100 TJ =+25°C IO = 250mA to 750mA - 3 50 TJ =+25°C - 3 6 IO = 5mA to 1A - 0.05 0.5 VI = -8V to -25V - 0.1 0.8 IO = 5mA - - 0.4 - mV/°C - 40 - μV TJ = +25°C Unit V mV mV mA mA Output Noise Voltage VN f = 10Hz to 100kHz TA =+25°C Ripple Rejection RR f = 120Hz ΔVI = 10V 54 60 - dB Dropout Voltage VD TJ = +25°C IO = 1A - 2 - V Short Circuit Current ISC TJ =+25°C, VI = -35V - 300 - mA Peak Current IPK TJ =+25°C - 2.2 - A Note 3. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 2 LM79XX Electrical Characteristics (LM7906) (Continued) (VI = -11V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.) Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient of VD Symbol VO ΔVO ΔVO IQ ΔIQ ΔVo/ΔT Conditions Min. Typ. Max. TJ = +25°C -5.75 -6 -6.25 IO = 5mA to 1A, PO ≤ 15W VI = -9V to -21V -5.7 -6 -6.3 VI = -8V to -25V - 10 120 VI = -9V to -13V - 5 60 TJ = +25°C IO = 5mA to 1.5A - 10 120 TJ =+25°C IO = 250mA to 750mA - 3 60 TJ =+25°C - 3 6 IO = 5mA to 1A - 0.05 0.5 VI = -8V to -25V - 0.1 1.3 IO = 5mA - -0.5 - mV/°C - 130 - μV TJ = +25°C Unit V mV mV mA mA Output Noise Voltage VN f = 10Hz to 100kHz TA =+25°C Ripple Rejection RR f = 120Hz ΔVI = 10V 54 60 - dB Dropout Voltage VD TJ = +25°C IO = 1A - 2 - V Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA Peak Current IPK TJ = +25°C - 2.2 - A Note 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 3 LM79XX Electrical Characteristics (LM7908) (Continued) (VI = -14V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.) Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient of VD Symbol VO ΔVO ΔVO IQ ΔIQ ΔVo/ΔT Conditions Min. Typ. Max. TJ = +25°C -7.7 -8 -8.3 IO = 5mA to 1A, PO ≤ 15W VI = -10V to -23V -7.6 -8 -8.4 VI = -10.5V to -25V - 10 160 VI = -11V to -17V - 5 80 TJ = +25°C IO = 5mA to 1.5A - 12 160 TJ =+25°C IO = 250mA to 750mA - 4 80 TJ =+25°C - 3 6 IO = 5mA to 1A - 0.05 0.5 VI = -10.5V to -25V - 0.1 1 IO = 5mA - -0.6 - mV/°C - 175 - μV TJ = +25°C Unit V mV mV mA mA Output Noise Voltage VN f = 10Hz to 100kHz TA =+25°C Ripple Rejection RR f = 120Hz ΔVI = 10V 54 60 - dB Dropout Voltage VD TJ = +25°C IO = 1A - 2 - V Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA Peak Current IPK TJ = +25°C - 2.2 - A Note 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 4 LM79XX Electrical Characteristics (LM7909) (Continued) (VI = -15V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.) Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient of VD Symbol VO ΔVO ΔVO IQ ΔIQ ΔVo/ΔT Conditions Min. Typ. Max. TJ = +25°C -8.7 -9.0 -9.3 IO = 5mA to 1A, PO ≤ 15W VI = -1.5V to -23V -8.6 -9.0 -9.4 VI = -11.5V to -26V - 10 180 VI = -12V to -18V - 5 90 TJ = +25°C IO = 5mA to 1.5A - 12 180 TJ = +25°C IO = 250mA to 750mA - 4 90 TJ = +25°C - 3 6 IO = 5mA to 1A - 0.05 0.5 VI = -11.5V to -26V - 0.1 1 IO = 5mA - -0.6 - mV/°C - 175 - μV TJ = +25°C Unit V mV mV mA mA Output Noise Voltage VN f = 10Hz to 100kHz TA = +25°C Ripple Rejection RR f = 120Hz ΔVI = 10V 54 60 - dB Dropout Voltage VD TJ = +25°C IO = 1A - 2 - V Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA Peak Current IPK TJ = +25°C - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 5 LM79XX Electrical Characteristics (LM7910) (Continued) (VI = -17V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.) Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient of VO Symbol VO ΔVO ΔVO IQ ΔIQ ΔVo/ΔT Conditions Min. Typ. Max. TJ = +25°C -9.6 -10 -10.4 IO = 5mA to 1A, Pd ≤ 15W VI = -12V to -28 -9.5 -10 -10.5 VI = -12.5V to -28V - 12 200 VI = -14V to -20V - 6 100 TJ = +25°C IO = 5mA to 1.5A - 12 200 TJ = +25°C IO = 250mA to 750mA - 4 100 TJ = +25°C - 3 6 IO = 5mA to 1A - 0.05 0.5 VI = -12.5V to -28V - 0.1 1 IO = 5mA - -1 - mV/°C - 280 - μV TJ = +25°C Unit V mV mV mA mA Output Noise Voltage VN 10Hz ≤ f ≤ 100kHz TA =+25°C Ripple Rejection RR f = 120Hz ΔVI = 10V 54 60 - dB Dropout Voltage VD TJ = +25°C IO = 1A - 2 - V Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA Peak Current IPK TJ = +25°C - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 6 LM79XX Electrical Characteristics (LM7912) (Continued) (VI = -19V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.) Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient of VD Symbol VO ΔVO ΔVO IQ ΔIQ ΔVo/ΔT Conditions Min. Typ. Max. TJ = +25°C -11.5 -12 -12.5 IO = 5mA to 1A, PO ≤ 15W VI = -15.5V to -27V -11.4 -12 -12.6 VI = -14.5V to -30V - 12 240 VI = -16V to -22V - 6 120 TJ = +25°C IO = 5mA to 1.5A - 12 240 TJ = +25°C IO = 250mA to 750mA - 4 120 TJ = +25°C - 3 6 IO = 5mA to 1A - 0.05 0.5 VI = -14.5V to -30V - 0.1 1 IO = 5mA - -0.8 - mV/°C - 200 - μV TJ = +25°C Unit V mV mV mA mA Output Noise Voltage VN f = 10Hz to 100kHz TA = +25°C Ripple Rejection RR f = 120Hz ΔVI = 10V 54 60 - dB Dropout Voltage VD TJ = +25°C IO = 1A - 2 - V Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA Peak Current IPK TJ = +25°C - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 7 LM79XX Electrical Characteristics (LM7915) (Continued) (VI = -23V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.) Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient of VD Symbol VO ΔVO ΔVO IQ ΔIQ ΔVo/ΔT Conditions Min. Typ. Max. TJ = +25°C -14.4 -15 -15.6 IO = 5mA to 1A, PO ≤ 15W VI = -18V to -30V -14.25 -15 -15.75 VI = -17.5V to -30V - 12 300 VI = -20V to -26V - 6 150 TJ = +25°C IO = 5mA to 1.5A - 12 300 TJ = +25°C IO = 250mA to 750mA - 4 150 TJ = +25°C - 3 6 IO = 5mA to 1A - 0.05 0.5 VI = -17.5V to -30V - 0.1 1 IO = 5mA - -0.9 - mV/°C - 250 - μV TJ = +25°C Unit V mV mV mA mA Output Noise Voltage VN f = 10Hz to 100kHz TA =+25°C Ripple Rejection RR f = 120Hz ΔVI = 10V 54 60 - dB Dropout Voltage VD TJ = +25°C IO = 1A - 2 - V Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA Peak Current IPK TJ = +25°C - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 8 LM79XX Electrical Characteristics (LM7918) (Continued) (VI = -27V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.) Parameter Output Voltage Line Regulation (Note1) Load Regulation (Note1) Symbol VO ΔVO ΔVO Quiescent Current IQ Quiescent Current Change ΔIQ Temperature Coefficient of VD ΔVo/ΔT Conditions Min. Typ. Max. TJ = +25°C -17.3 -18 -18.7 IO = 5mA to 1A, PO ≤ 15W VI = -22.5V to -33V -17.1 -18 -18.9 VI = -21V to -33V - 15 360 VI = -24V to -30V - 8 180 TJ = +25°C IO = 5mA to 1.5A - 15 360 TJ = +25°C IO = 250mA to 750mA - 5 180 TJ = +25°C - 3 6 IO = 5mA to 1A - 0.05 0.5 VI = -21V to -33V - 0.1 1 IO = 5mA - -1 - mV/°C - 300 - μV TJ = +25°C Unit V mV mV mA mA Output Noise Voltage VN f = 10Hz to 100kHz TA = +25°C Ripple Rejection RR f = 120Hz ΔVI = 10V 54 60 - dB Dropout Voltage VD TJ = +25°C IO = 1A - 2 - V Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA Peak Current IPK TJ = +25°C - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 9 LM79XX Electrical Characteristics (LM7924) (Continued) (VI = -33V, IO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.) Parameter Symbol Conditions Min. Typ. Max. -23 -24 -25 -22.8 -24 -25.2 VI = -27V to -38V - 15 480 VI = -30V to -36V - 8 180 TJ = +25°C IO = 5mA to 1.5A - 15 480 TJ = +25°C IO = 250mA to 750mA - 5 240 TJ = +25°C - 3 6 IO = 5mA to 1A - 0.05 0.5 VI = -27V to -38V - 0.1 1 IO = 5mA - -1 - mV/°C - 400 - μV TJ = +25°C Output Voltage Line Regulation (Note1) Load Regulation (Note1) Quiescent Current Quiescent Current Change Temperature Coefficient of VD VO ΔVO ΔVO IQ ΔIQ ΔVo/ΔT IO = 5mA to 1A, PO ≤ 15W VI = -27V to -38V TJ = +25°C Unit V mV mV mA mA Output Noise Voltage VN f = 10Hz to 100kHz TA = +25°C Ripple Rejection RR f = 120Hz ΔVI = 10V 54 60 - dB Dropout Voltage VD TJ = +25°C IO = 1A - 2 - V Short Circuit Current ISC TJ = +25°C, VI = -35V - 300 - mA Peak Current IPK TJ = +25°C - 2.2 - A Note: 1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty is used. 10 LM79XX Typical Performance Characteristics 15 Vin=10V Io=40mA Ou 5.05 tp 5 ut Vo lta 4.95 ge [- 4.9 V] Load Regulation[mV] Output Voltage[-V] 5.1 Vin=25V Io=100mA 4.85 Lo 13 ad 11 Re 9 gul 7 ati 5 on 3 [m 1 V] Io=1.5A Io=0.75A -1 -3 4.8 -5 -40 -25 0 25 50 75 100 125 -40 -25 TA, Ambient Temperature [ oC] Figure 1. Output Voltage 25 50 75 100 125 Figure 2. Load Regulation 4 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Dropout Voltage [V] V l [V] 3.5 D Quiescent Current [mA] 0 TA, Ambient Temperature [ oC] 3 2.5 2 1.5 Io=1A 1 0.5 0 -40 -25 0 25 50 75 100 TA, Ambient Temperature [oC] 125 Figure 3. Quiescent Current -40 -25 0 25 50 75 100 125 TA, Ambient Temperature [oC] Figure 4. Dropout Voltage Short Circuit Current[A] 0.6 0.55 Sh 0.5 ort 0.45 Cir 0.4 cui 0.35 0.3 t 0.25 Cu 0.2 rre 0.15 nt 0.1 [A] 0.05 0 -0.05 -0.1 -40 -25 0 25 50 75 100 TA, Ambient Temperature [ oC] 125 Figure 5. Short Circuit Current 11 LM79XX Typical Applications + 2.2μF + 1μ F CO 1 CI 2 - VI KA79XX 3 LM79XX Input - VO Output Figure 6. Negative Fixed output regulator 1 + 15V MC7812 KA7812 + C1 0.33μF 2 1 - 15V 2 + Co 1 μF +12V 1N4001 * GND + 2.2μF C1 3 KA7912 LM7912 1 μF + Co 3 1N4001 * -12V Figure 7. Split power supply ( ± 12V/1A) Notes: (1) To specify an output voltage, substitute voltage value for "XX " (2) Required for stability. For value given, capacitor must be solid tantalum. If aluminium electronics are used, at least ten times value shown should be selected. CI is required if regulator is located an appreciable distance from power supply filter. (3) To improve transient response. If large capacitors are used, a high current diode from input to output (1N400l or similar) should be introduced to protect the device from momentary input short circuit. 12 LM79XX Mechanical Dimensions Package Dimensions in millimeters TO-220 [ SINGLE GAUGE ] 13 LM79XX Ordering Information Product Number Output Voltage Tolerance Package Operating Temperature ±4% TO-220 0 ~ +125°C LM7905CT LM7906CT LM7908CT LM7909CT LM7910CT LM7912CT LM7915CT LM7918CT LM7924CT 14 LM79XX 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. 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. www.fairchildsemi.com 7/6/09 0.0m 001 Stock#DS400021 © 2009 Fairchild Semiconductor Corporation