Spec. No. : C531A3 Issued Date : 2003.04.08 Revised Date : 2010.11.16 Page No. : 1/4 CYStech Electronics Corp. Three Terminal Low Current Negative Voltage Regulators TO-92 LM79L12A3 Description The LM79L12A3 is an inexpensive, easy-to-use device suitable for numerous applications requiring up to 100mA. Like the higher powered LM7900E3 series negative regulators, this device features thermal shutdown and current limiting, making it remarkably rugged. In most applications, no external components are required for operation. The LM79L12A3 device is useful for on-card regulation or any other application where a regulated negative voltage at a modest current level is needed. This regulator offers substantial advantage over the common resistor/zener diode approach. • No external components required •Internal short circuit current limiting •Internal thermal overload protection •Low cost •Complementary positive regulators offered(LM78L12A3) •Available in either ±3% or ±5% selection. Absolute Maximum Ratings (Ta=25°C) • Input Voltage………………………………………………………………………………………………. -35V • Total Power Dissipation……………………………………………………………………. Internally limited • Operating Temperature Range……………………………………………………………. 0 °C to +125 °C • Maximum Junction Temperature……………………………………………………………………. .+150 °C • Storage Temperature Range……………………………………………………………… -65 °C to +150 °C • Lead Temperature (Soldering 10S)……………………………….. ……………………………... 260 °C Typical Application Representative Schematic Diagram Gnd Vin LM79L12 Vout R8 R6 R5 Q10 R9 Q5 R18 R1 C1 Q4 D1 C2 R17 R7 Q8 Q14 R16 Q9 Q1 R4 Outpu R2 Q12 Note: C1 and C2 are required if regulator is located far from power supply filter and load, or oscillation may induced on the loop. LM79L12A3 Z1 Q13 C Q2 Q11 R14 R3 Q6 R10 R11 Q7 R15 Input CYStek Product Specification Spec. No. : C531A3 Issued Date : 2003.04.08 Revised Date : 2010.11.16 Page No. : 2/4 CYStech Electronics Corp. Ordering Information Device LM79L12A3 A-rank LM79L12A3 B-rank Output Voltage Tolerance ±3% ±5% Electrical Characteristics Vin=-19V, Iout=40mA, 0°C≤Tj≤125°C, Cin=0.33μF, Cout=0.1μF (unless otherwise noted) Symbol Parameter Vo Output Voltage ΔVo Line Regulation ΔVo Load Regulation IQ Quiescent Current Quiescent Current Change Vn Output Noise Voltage ΔVin / ΔVout Ripple Rejection VD Dropout Voltage ΔIQ Symbol Parameter Vo Output Voltage ΔVo Line Regulation ΔVo Load Regulation IQ Quiescent Current Quiescent Current Change Vn Output Noise Voltage ΔVin / ΔVout Ripple Rejection VD Dropout Voltage ΔIQ LM79L12A3 Conditions Tj=25°C 1mA≤Io≤70mA 1mA≤Io≤40mA and -14.5V≤Vin≤-27V Tj=25°C, -14.5V≤Vin≤-27V Tj=25°C, -16V≤Vin≤-27V Tj=25°C, 1mA≤Io≤100mA Tj=25°C, 1mA≤Io≤40mA Tj=25°C Tj=125°C 1mA≤Io≤40mA -16V≤Vin≤-27V Ta=25°C, 10Hz≤f≤100KHz -15V≤Vin≤-25V, f=120Hz Tj=25°C,Iout=40mA Conditions Tj=25°C 1mA≤Io≤70mA 1mA≤Io≤40mA and -14.5V≤Vin≤-27V Tj=25°C, -14.5V≤Vin≤-27V Tj=25°C, -16V≤Vin≤-27V Tj=25°C, 1mA≤Io≤100mA Tj=25°C, 1mA≤Io≤40mA Tj=25°C Tj=125°C 1mA≤Io≤40mA -16V≤Vin≤-27V Ta=25°C, 10Hz≤f≤100KHz -15V≤Vin≤-25V, f=120Hz Tj=25°C,Iout=40mA LM79L12A3 A-rank Units Min Typ Max -11.64 -12.00 -12.36 -11.6 -12.4 V -11.6 -12.4 37 - 80 42 1.7 250 200 100 50 6.5 6.0 0.2 1.5 - mV mV mA mA μV dB V LM79L05A3 B-rank Units Min Typ Max -11.52 -12.00 -12.48 -11.4 -12.6 V -11.4 -12.6 37 - 80 42 1.7 250 200 100 50 6.5 6.0 0.2 1.5 - mV mV mA mA μV dB V CYStek Product Specification CYStech Electronics Corp. Spec. No. : C531A3 Issued Date : 2003.04.08 Revised Date : 2010.11.16 Page No. : 3/4 Recommended wave soldering condition Product Pb-free devices Peak Temperature 260 +0/-5 °C Soldering Time 5 +1/-1 seconds Recommended temperature profile for IR reflow Profile feature Average ramp-up rate (Tsmax to Tp) Preheat −Temperature Min(TS min) −Temperature Max(TS max) −Time(ts min to ts max) Time maintained above: −Temperature (TL) − Time (tL) Peak Temperature(TP) Time within 5°C of actual peak temperature(tp) Ramp down rate Time 25 °C to peak temperature Sn-Pb eutectic Assembly Pb-free Assembly 3°C/second max. 3°C/second max. 100°C 150°C 60-120 seconds 150°C 200°C 60-180 seconds 183°C 60-150 seconds 240 +0/-5 °C 217°C 60-150 seconds 260 +0/-5 °C 10-30 seconds 20-40 seconds 6°C/second max. 6 minutes max. 6°C/second max. 8 minutes max. Note : All temperatures refer to topside of the package, measured on the package body surface. LM79L12A3 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C531A3 Issued Date : 2003.04.08 Revised Date : 2010.11.16 Page No. : 4/4 TO-92 Dimension α2 A B 1 2 3 79L12 α3 C Date Code □□ □ Rank D H I G α1 Style: Pin 1.GND 2.Vin 3.Vout E F 3-Lead TO-92 Plastic Package CYStek Package Code: A3 *: Typical Inches Min. Max. 0.1704 0.1902 0.1704 0.1902 0.5000 0.0142 0.0220 *0.0500 0.1323 0.1480 DIM A B C D E F Millimeters Min. Max. 4.33 4.83 4.33 4.83 12.70 0.36 0.56 *1.27 3.36 3.76 DIM G H I α1 α2 α3 Inches Min. Max. 0.0142 0.0220 *0.1000 *0.0500 *5° *2° *2° Millimeters Min. Max. 0.36 0.56 *2.54 *1.27 *5° *2° *2° Notes: 1.Controlling dimension: millimeters. 2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 3.If there is any question with packing specification or packing method, please contact your local CYStek sales office. Material: • Lead: Pure tin plated. • Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0. Important Notice: • All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek. • CYStek reserves the right to make changes to its products without notice. • CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems. • CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. LM79L12A3 CYStek Product Specification