CYStech Electronics Corp. Spec. No. : C536J3 Issued Date : 2008.02.20 Revised Date : 2008.08.22 Page No. : 1/6 3-TERMINAL NEGATIVE VOLTAGE REGULATOR LM7912J3 Description TO-252 The LM7912J3 series of three-terminal negative regulators are available in the TO-252 package. These regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation. Each employs internal current limiting, thermal shutdown and safe operating area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. LM7912J3 is characterized for operation from -40°C to +125°C, and if operating temperature is always high, please refer to the power dissipation curve. Absolute Maximum Ratings (Ta=25°C) • Input Voltage ....................................................................................................................................... -40 V • Total Power Dissipation ................................................................................................... Internally limited • Operating Junction Temperature..................................................................................... -40 °C to +125 °C • Maximum Junction Temperature ...................................................................................................... 125 °C • Storage Temperature Range ............................................................................................ -65 °C to +150 °C Schematic Diagram Typical Application GND 1.4k Vin 2 LM7912 3 4K Vout 5K 7K 15K 1 C1 Vout C2 3K 6.2V 10K 20pF Note: Bypass Capacitors are recommended for optimum stability and transient response and should be located as close as possible to the regulator. LM7912J3 750 Vin 1K 6K 20K 20K 20K 10pF 600 5K 15K 20K 150 0.2 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C536J3 Issued Date : 2008.02.20 Revised Date : 2008.08.22 Page No. : 2/6 Electrical Characteristics Vin=-19V, Io=500mA, Cin=2.2uF, Cout=1uF, 0°C≤Tj≤125°C (unless otherwise noted) Symbol Parameter Output Voltage Vo Output Voltage ΔVo Line Regulation ΔVo Load Regulation IQ ΔIQ ΔVo / ΔT Vn RR VD Isc Ipk Quiescent Current Quiescent Current Change Output Voltage Drift Output Noise Voltage Ripple Rejection Dropout Voltage Short Circuit Current Peak Output Current Limits Min Typ Max -11.5 -12 -12.5 Conditions Tj=25°C PD≤15W, 5mA≤ IO≤ 1A -14.5V≥Vin≥ -27V Tj=25°C, -14.5V ≥ Vin≥-30V Tj=25°C, -16V≥Vin≥-22V 5mA≤ IO≤1.5A 250mA≤ IO≤750mA IO≤1A, Tj=25°C 5mA≤ IO≤1A -15V≥Vin≥-25V Io=5mA Ta=25°C, 10Hz≤ f ≤100KHz ΔVi=10V, f=120Hz Tj=25°C, IO=1A Tj=25°C, Vin=-35V Tj=25°C -11.4 -12 -12.6 54 1.3 3 -0.8 200 68 2 2.2 2.2 240 120 240 120 8 0.5 1.0 - Units V mV mV mA mA mV/°C μV dB V A A Ordering Information Device Output Voltage Tolerance Package Shipping Marking LM7912J3 ±5% TO-252 (Pb-free) 2500 pcs / Tape & Reel 7912 Moisture Sensitivity Level : conform to JEDEC level 3 Recommended Storage Condition: Temperature : ≤ 30 °C Humidity : ≤ 60% RH LM7912J3 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C536J3 Issued Date : 2008.02.20 Revised Date : 2008.08.22 Page No. : 3/6 Characteristic Curves Peak Output Current as A Function of InputOutput Differentail Voltage Average Case Power Dissipation as A Function of Ambient Temperauture 100 2.5 10 Output Current Power Dissipation 2 1 1.5 1 0.5 0 0.1 25 50 75 100 125 0 150 3 6 9 12 15 18 21 24 Ambient Temperature (ºC) Input-Output Voltage Differential Ripple Rejection as A Function of Frequency Ripple Rejection as A Function of Output Voltage 100 27 30 20 22 80 Ripple Rejection (dB) Ripple Rejection (dB) 80 60 40 20 70 60 50 40 0 10 100 1000 10000 100000 Frequency 2 4 6 8 10 12 14 16 18 Output Voltage Output Voltage as A Function of Junction Temperature 6.26 Output Voltage (Volts) 6.22 6.18 6.14 6.1 6.06 -25 0 25 50 75 100 125 175 Junction Temperature (ºC) LM7912J3 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C536J3 Issued Date : 2008.02.20 Revised Date : 2008.08.22 Page No. : 4/6 Reel Dimension Carrier Tape Dimension LM7912J3 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C536J3 Issued Date : 2008.02.20 Revised Date : 2008.08.22 Page No. : 5/6 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. LM7912J3 CYStek Product Specification CYStech Electronics Corp. Spec. No. : C536J3 Issued Date : 2008.02.20 Revised Date : 2008.08.22 Page No. : 6/6 TO-252 Dimension C A Marking: D B G F L Date Code 7912 □□□□ 3 H E 2 K I 1 J Style: Pin 1.Ground 2.Vin 3.Vout 3-Lead TO-252 Plastic Surface Mount Package CYStek Package Code: J3 *: Typical Inches Min. Max. 0.0177 0.0217 0.0650 0.0768 0.0354 0.0591 0.0177 0.0236 0.2520 0.2677 0.2125 0.2283 DIM A B C D E F Millimeters Min. Max. 0.45 0.55 1.65 1.95 0.90 1.50 0.45 0.60 6.40 6.80 5.40 5.80 DIM G H I J K L Inches Min. Max. 0.0866 0.1102 *0.0906 0.0354 0.0315 0.2047 0.2165 0.0551 0.0630 Millimeters Min. Max. 2.20 2.80 *2.30 0.90 0.80 5.20 5.50 1.40 1.60 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: KFC; solder plating • 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. LM7912J3 CYStek Product Specification