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LM7912 Dataheets PDF



Part Number LM7912
Manufacturers AP Semiconductor
Logo AP Semiconductor
Description 3-Terminal Negative voltage Regulators
Datasheet LM7912 DatasheetLM7912 Datasheet (PDF)

LM79XX 3-Terminal Negative voltage Regulators DESCRIPTION These voltage regulators are designed as fixed negative voltage regulators for a wide variety of applications including local, on-card regulation. Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents. FEATURES ■ Output current in excess of 1.0A ■ No external components required ■ Output Voltages (-5V, -6V, -8V, -9V, -10V, -12V, -15V, -18V) .

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LM79XX 3-Terminal Negative voltage Regulators DESCRIPTION These voltage regulators are designed as fixed negative voltage regulators for a wide variety of applications including local, on-card regulation. Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents. FEATURES ■ Output current in excess of 1.0A ■ No external components required ■ Output Voltages (-5V, -6V, -8V, -9V, -10V, -12V, -15V, -18V) ■ Internal Thermal shutdown and SOA protection ■ Output voltage offered in 4% Tolerance ■ Pb-Free Packages are available ■ High ESD Level (HBM>8000V, MM>800V) TYPICAL APPLICATION The input voltage must remain typically 2.0V above the output voltage even during the low point on the ripple voltage. * CI is required if regulator is located an appreciable Distance from power filter. * CO improves transient response. Values of ≤ 1.0 µF could cause instability. Input 2 Output 3 1 CI CO 2.2uF 1.0uF 1.0A ,Negative voltage Regulators www.apsemi.com REV. 03 1 LM79XX Maximum Ratings (TA=25 °C, unless otherwise noted) Rating Symbol Value Unit TO-220F TO-220 TO-252 Input Voltage -5V ~ -18V VI -35 V -24V -40 Power Dissipation Thermal Resistance of Junction to Ambient Thermal Resistance of Junction to Case Storage Temperature Junction Temperature Operating Temperature PD RθJA RθJC TSTG TJ TOPR 22 65 65 55 -55 ~ 125 + 150 -40 ~ 125 1.3 92 5 W °C/W °C/W °C °C °C Stresses exceeding Maximum ratings may damage the device. Maximum ratings are stress ratings. Functional operation above the recommended operating conditions is not implied. Extended exposure to stresses the above the recommended operating conditions may affect device reliability. PD(max) = (TJ(max)–TA) ÷ θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. Representative Schematic of LM79XX R15 R18 R21 Q22 R22 D1 R1 Q17 Q19 Q21 Q24 C1 D2 + Q20 Q18 D5 Q23 GND R13 R12 D3 R14 Q2 Q3 R17 R19 R20 R0 Q4 Q7 Q6 Q5 R2 R22A Q12 Q13 Q26 Q27 R10 D4 R11 OUTPUT Q8 Q9 R3 C2 C3 ++ Q10 Q11 R4 R5 Q14 Q15 R9 R6 R7 Q16 R8 www.apsemi.com INPUT REV. 03 2 LM79XX Ordering Information Part No Package Packing LM79XXRTRL TO-252 Reel & Tape LM79XXFTL TO-220F Tube LM79XXTL TO-220 Tube Finish Halogen Packing Unit Remark Sn Free 2,500ea XX : Output Voltage option * Sn Free 5,000ea XX : Output Voltage option * Sn Free 5,000ea XX : Output Voltage option * * Voltage option (XX) : -5V(05), -6V(06), -8V(08), -9V(09), -10V(10), -12V(12), -15V(15), -18V(18),-24V(24) Package Outline PIN INFO. 1. GND PIN 2. INPUT PIN 3. OUTPUT PIN www.apsemi.com REV. 03 3 LM79XX Electrical characteristics *Note 1 Line and Load regulation are specified at constant junction temperature. Changes of VO due to heating effects must be taken into account separately. Pulse testing with low duty circle is used. Electrical characteristics (LM7905) (TJ = 0 to 125 °C, VIN=10V, IO=500 mA, CI=2.2 µF, CO=1.0 µF, unless otherwise noted) Characteristic Symbol Condition Min TJ=25°C -4.8 Output voltage VO 5.0mA ≤ IO ≤ 1.0A, PD≤15W -7.0V ≥ VIN ≥ -20.0V -4.75 Line regulation (TJ=25°C) Regline -7.0V ≥ VIN ≥ -25.0V (Note 1) -8.0V ≥ VIN ≥ -12.0V Load regulation (TJ=25°C) (Note 1) Regload 5.0 mA ≤ IO ≤ 1.5A 250 mA ≤ IO ≤ 750 mA Quiescent current IQ TJ=25°C Quiescent current change Δ IQ 5.0 mA ≤ IO ≤ 1.0 A -8.0V ≥ VIN ≥ -25.0V Output Voltage Drift ΔVO/ΔT IO = 5.0 mA Output noise voltage VN 10 Hz ≤ f ≤ 100 KHz, TA=25°C Ripple rejection RR -8.0V ≥ VIN ≥ -18.0V, f=120 Hz 54 Dropout voltage VDROP IO = 1.0A, TJ=25°C Short circuit current limit ISC VIN = -35V, TA=25°C Peak output current IPK TJ=25°C Electrical characteristics (LM7906) (TJ = 0 to 125 °C, VIN=11V, IO=500 mA, CI=2.2 µF, CO=1.0 µF, unless otherwise noted) Characteristic Symbol Condition Min TJ=25°C -5.75 Output voltage VO 5.0mA ≤ IO ≤ 1.0A, PD≤15W -8.0V ≥ VIN ≥ -21.0V -5.7 Line regulation (TJ=25°C) Regline -8.0V ≥ VIN ≥ -25.0V (Note 1) -9.0V ≥ VIN ≥ -13.0V Load regulation (TJ=25°C) Regload 5.0 mA ≤ IO ≤ 1.5A (Note 1) 250 mA ≤ IO ≤ 750 mA Quiescent current IQ TJ=25°C Quiescent current change Δ IQ 5.0 mA ≤ IO ≤ 1.0 A -8.0V ≥ VIN ≥ -25.0V Output Voltage Drift ΔVO/ΔT IO = 5.0 mA Output noise voltage VN 10 Hz ≤ f ≤ 100 KHz, TA=25°C Ripple rejection RR -9.0V ≥ VIN ≥ -19.0V, f=120 Hz 54 Dropout voltage VDROP IO = 1.0A, TJ=25°C Short circuit current limit ISC VIN = -35V, TA=25°C Peak output current IPK TJ=25°C Typ -5.0 -5.0 -0.4 40 60 1.3 500 2.2 Typ -6.0 -6.0 -0.5 130 60 1.3 500 2.2 Max -5.2 -5.25 100 50 100 50 6.0 0.5 0.8 Unit V mV mV mA mA mV/°C µV/VO dB V mA A Max -6.25 -6.3 120 60 120 60 6.0 0.5 1.3 Unit V .


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