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www.fairchildsemi.com LM79XX 3-Terminal 1A Negative Voltage Regulator Features Description • Output Current in Excess of 1A The LM79XX series of three terminal negative regulators • Output Voltages of -5, -6, -8 , -9, -10, -12, -15, -18 and - are available in TO-220 package and with several fixed 24V output voltages, making them useful in a wide range • Internal Thermal Overload Protection of applications. Each type employs internal current limiting, • Short Circuit Protection thermal shut down and safe operating area protection, • Output Transistor Safe Operating Area Compensation making it essentially indestructible. TO-220 (Single Gauge) Vin 1 1. GND 2. Input 3. Output Internal Block Digram GND R1 VOLTAGE REFERENCE R2 OOuutptut + Q1 - Q2 PROTECTION I1 I2 CIRCUITRY Rsc In Input Rev. 1.0.3 ©2011 Fairchild Semiconductor Corporation

LM79XX Absolute Maximum Ratings Parameter Symbol Value Unit Input Voltage VI -35 V Thermal Resistance Junction-Case (Note1) RθJC 5 °C/W Thermal Resistance Junction-Air (Note1, 2) RθJA 65 Operating Temperature Range TOPR 0 ~ +125 °C Storage Temperature Range TSTG -65 ~ +150 °C 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 Symbol Conditions Min. Typ. Max. Unit TJ = +25°C -4.8 -5.0 -5.2 Output Voltage VO IO = 5mA to 1A, PO ≤ 15W V -4.75 -5.0 -5.25 VI = -7V to -20V VI = -7V to -25V - 35 100 Line Regulation (Note3) ΔVO TJ = +25°C mV VI = -8V to -12V - 8 50 TJ = +25°C - 10 100 IO = 5mA to 1.5A Load Regulation (Note3) ΔVO mV TJ =+25°C - 3 50 IO = 250mA to 750mA Quiescent Current IQ TJ =+25°C - 3 6 mA IO = 5mA to 1A - 0.05 0.5 Quiescent Current Change ΔIQ mA VI = -8V to -25V - 0.1 0.8 Temperature Coefficient of VD ΔVo/ΔT IO = 5mA - - 0.4 - mV/°C f = 10Hz to 100kHz Output Noise Voltage VN - 40 - μV TA =+25°C f = 120Hz Ripple Rejection RR 54 60 - dB ΔVI = 10V TJ = +25°C Dropout Voltage VD - 2 - V IO = 1A 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 Symbol Conditions Min. Typ. Max. Unit TJ = +25°C -5.75 -6 -6.25 Output Voltage VO IO = 5mA to 1A, PO ≤ 15W V -5.7 -6 -6.3 VI = -9V to -21V VI = -8V to -25V - 10 120 Line Regulation (Note1) ΔVO TJ = +25°C mV VI = -9V to -13V - 5 60 TJ = +25°C - 10 120 IO = 5mA to 1.5A Load Regulation (Note1) ΔVO mV TJ =+25°C - 3 60 IO = 250mA to 750mA Quiescent Current IQ TJ =+25°C - 3 6 mA IO = 5mA to 1A - 0.05 0.5 Quiescent Current Change ΔIQ mA VI = -8V to -25V - 0.1 1.3 Temperature Coefficient of VD ΔVo/ΔT IO = 5mA - -0.5 - mV/°C f = 10Hz to 100kHz Output Noise Voltage VN - 130 - μV TA =+25°C f = 120Hz Ripple Rejection RR 54 60 - dB ΔVI = 10V TJ = +25°C Dropout Voltage VD - 2 - V IO = 1A 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 Symbol Conditions Min. Typ. Max. Unit TJ = +25°C -7.7 -8 -8.3 Output Voltage VO IO = 5mA to 1A, PO ≤ 15W V -7.6 -8 -8.4 VI = -10V to -23V VI = -10.5V to -25V - 10 160 Line Regulation (Note1) ΔVO TJ = +25°C mV VI = -11V to -17V - 5 80 TJ = +25°C - 12 160 IO = 5mA to 1.5A Load Regulation (Note1) ΔVO mV TJ =+25°C - 4 80 IO = 250mA to 750mA Quiescent Current IQ TJ =+25°C - 3 6 mA IO = 5mA to 1A - 0.05 0.5 Quiescent Current Change ΔIQ mA VI = -10.5V to -25V - 0.1 1 Temperature Coefficient of VD ΔVo/ΔT IO = 5mA - -0.6 - mV/°C f = 10Hz to 100kHz Output Noise Voltage VN - 175 - μV TA =+25°C f = 120Hz Ripple Rejection RR 54 60 - dB ΔVI = 10V TJ = +25°C Dropout Voltage VD - 2 - V IO = 1A 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 Symbol Conditions Min. Typ. Max. Unit TJ = +25°C -8.7 -9.0 -9.3 Output Voltage VO IO = 5mA to 1A, PO ≤ 15W V -8.6 -9.0 -9.4 VI = -1.5V to -23V VI = -11.5V to -26V - 10 180 Line Regulation (Note1) ΔVO TJ = +25°C mV VI = -12V to -18V - 5 90 TJ = +25°C - 12 180 IO = 5mA to 1.5A Load Regulation (Note1) ΔVO mV TJ = +25°C - 4 90 IO = 250mA to 750mA Quiescent Current IQ TJ = +25°C - 3 6 mA IO = 5mA to 1A - 0.05 0.5 Quiescent Current Change ΔIQ mA VI = -11.5V to -26V - 0.1 1 Temperature Coefficient of VD ΔVo/ΔT IO = 5mA - -0.6 - mV/°C f = 10Hz to 100kHz Output Noise Voltage VN - 175 - μV TA = +25°C f = 120Hz Ripple Rejection RR 54 60 - dB ΔVI = 10V TJ = +25°C Dropout Voltage VD - 2 - V IO = 1A 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 Symbol Conditions Min. Typ. Max. Unit TJ = +25°C -9.6 -10 -10.4 Output Voltage VO IO = 5mA to 1A, Pd ≤ 15W V -9.5 -10 -10.5 VI = -12V to -28 VI = -12.5V to -28V - 12 200 Line Regulation (Note1) ΔVO TJ = +25°C mV VI = -14V to -20V - 6 100 TJ = +25°C - 12 200 IO = 5mA to 1.5A Load Regulation (Note1) ΔVO mV TJ = +25°C - 4 100 IO = 250mA to 750mA Quiescent Current IQ TJ = +25°C - 3 6 mA IO = 5mA to 1A - 0.05 0.5 Quiescent Current Change ΔIQ mA VI = -12.5V to -28V - 0.1 1 Temperature Coefficient of VO ΔVo/ΔT IO = 5mA - -1 - mV/°C 10Hz ≤ f ≤ 100kHz Output Noise Voltage VN - 280 - μV TA =+25°C f = 120Hz Ripple Rejection RR 54 60 - dB ΔVI = 10V TJ = +25°C Dropout Voltage VD - 2 - V IO = 1A 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 Symbol Conditions Min. Typ. Max. Unit TJ = +25°C -11.5 -12 -12.5 Output Voltage VO IO = 5mA to 1A, PO ≤ 15W V -11.4 -12 -12.6 VI = -15.5V to -27V VI = -14.5V to -30V - 12 240 Line Regulation (Note1) ΔVO TJ = +25°C mV VI = -16V to -22V - 6 120 TJ = +25°C - 12 240 IO = 5mA to 1.5A Load Regulation (Note1) ΔVO mV TJ = +25°C - 4 120 IO = 250mA to 750mA Quiescent Current IQ TJ = +25°C - 3 6 mA IO = 5mA to 1A - 0.05 0.5 Quiescent Current Change ΔIQ mA VI = -14.5V to -30V - 0.1 1 Temperature Coefficient of VD ΔVo/ΔT IO = 5mA - -0.8 - mV/°C f = 10Hz to 100kHz Output Noise Voltage VN - 200 - μV TA = +25°C f = 120Hz Ripple Rejection RR 54 60 - dB ΔVI = 10V TJ = +25°C Dropout Voltage VD - 2 - V IO = 1A 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 Symbol Conditions Min. Typ. Max. Unit TJ = +25°C -14.4 -15 -15.6 Output Voltage VO IO = 5mA to 1A, PO ≤ 15W V -14.25 -15 -15.75 VI = -18V to -30V VI = -17.5V to -30V - 12 300 Line Regulation (Note1) ΔVO TJ = +25°C mV VI = -20V to -26V - 6 150 TJ = +25°C - 12 300 IO = 5mA to 1.5A Load Regulation (Note1) ΔVO mV TJ = +25°C - 4 150 IO = 250mA to 750mA Quiescent Current IQ TJ = +25°C - 3 6 mA IO = 5mA to 1A - 0.05 0.5 Quiescent Current Change ΔIQ mA VI = -17.5V to -30V - 0.1 1 Temperature Coefficient of VD ΔVo/ΔT IO = 5mA - -0.9 - mV/°C f = 10Hz to 100kHz Output Noise Voltage VN - 250 - μV TA =+25°C f = 120Hz Ripple Rejection RR 54 60 - dB ΔVI = 10V TJ = +25°C Dropout Voltage VD - 2 - V IO = 1A 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 Symbol Conditions Min. Typ. Max. Unit TJ = +25°C -17.3 -18 -18.7 Output Voltage VO IO = 5mA to 1A, PO ≤ 15W V -17.1 -18 -18.9 VI = -22.5V to -33V VI = -21V to -33V - 15 360 Line Regulation (Note1) ΔVO TJ = +25°C mV VI = -24V to -30V - 8 180 TJ = +25°C - 15 360 IO = 5mA to 1.5A Load Regulation (Note1) ΔVO mV TJ = +25°C - 5 180 IO = 250mA to 750mA Quiescent Current IQ TJ = +25°C - 3 6 mA IO = 5mA to 1A - 0.05 0.5 Quiescent Current Change ΔIQ mA VI = -21V to -33V - 0.1 1 Temperature Coefficient of VD ΔVo/ΔT IO = 5mA - -1 - mV/°C f = 10Hz to 100kHz Output Noise Voltage VN - 300 - μV TA = +25°C f = 120Hz Ripple Rejection RR 54 60 - dB ΔVI = 10V TJ = +25°C Dropout Voltage VD - 2 - V IO = 1A 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. Unit TJ = +25°C -23 -24 -25 Output Voltage VO IO = 5mA to 1A, PO ≤ 15W V -22.8 -24 -25.2 VI = -27V to -38V VI = -27V to -38V - 15 480 Line Regulation (Note1) ΔVO TJ = +25°C mV VI = -30V to -36V - 8 180 TJ = +25°C - 15 480 IO = 5mA to 1.5A Load Regulation (Note1) ΔVO mV TJ = +25°C - 5 240 IO = 250mA to 750mA Quiescent Current IQ TJ = +25°C - 3 6 mA IO = 5mA to 1A - 0.05 0.5 Quiescent Current Change ΔIQ mA VI = -27V to -38V - 0.1 1 Temperature Coefficient of VD ΔVo/ΔT IO = 5mA - -1 - mV/°C f = 10Hz to 100kHz Output Noise Voltage VN - 400 - μV TA = +25°C f = 120Hz Ripple Rejection RR 54 60 - dB ΔVI = 10V TJ = +25°C Dropout Voltage VD - 2 - V IO = 1A 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 5.1 15 Otuge[-V]ptu5.055 VIoi=n=401m0VA on[mV] LaRdoe11139 Io=1.5A Vlg[VOutput Voltat-aeo] 44..489.559 VIoi=n1=0205mVA oad Regulati gao[Vmtun]il-11357 Io=0.75A L -3 4.8 -5 -40 -25 0 25 50 75 100 125 -40 -25 0 25 50 75 100 125 TA, Ambient Temperature [oC] TA, Ambient Temperature [oC] Figure 1.Output Voltage Figure 2.Load Regulation 5 4 A]4.5 3.5 m 4 V] V] 3 Current [23..535 Vl[ Voltage [2.52 nt 2 ut 1.5 e o Io=1A uiesc1.15 D Drop 1 Q 0.5 0.5 0 0 -40 -25 0 25 50 75 100 125 -40 -25 0 25 50 75 100 125 TA, Ambient Temperature [oC] TA, Ambient Temperature [oC] Figure 3.Quiescent Current Figure 4.Dropout Voltage 0.6 0.55 Sh 0.5 ent[A]oCritr0.04.54 Currctui0.03.53 cuit Cu0.02.52 Cirrre0.15 hort n[At]0.00.51 S 0 -0.05 -0.1 -40 -25 0 25 50 75 100 125 TA, Ambient Temperature [oC] Figure 5.Short Circuit Current 11

LM79XX Typical Applications +2.2μF +1μF CI 1 CO 2 3 - VInIput LKMA7799XXXX Outp-u VtO Figure 6.Negative Fixed output regulator 1 3 + 15V MKCA77881122 +12V + + C1 2 Co 1N4001 0.33μF 1μF * GND +2.2μF 1μF + C1 1 Co 1N4001 * 2 3 - 15V LKMA77991122 -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 LM7905CT LM7906CT LM7908CT LM7909CT TO-220 LM7910CT ±4% 0 ~ +125°C (Single Gauge) 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 2. A critical component in any component of a life support which, (a) are intended for surgical implant into the body, device or system whose failure to perform can be or (b) support or sustain life, and (c) whose failure to reasonably expected to cause the failure of the life support perform when properly used in accordance with device or system, or to affect its safety or effectiveness. instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 9/7/11 0.0m 001 Stock#DS400021 © 2011 Fairchild Semiconductor Corporation

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