Output SOA protection Negative voltage regulators - st.com

1 123TO-220123TO-220FP13D PAK2 Features Output current up to A Output voltages: -5, -8, -12, and -5 V Thermal overload protection Short-circuit protection Output SOA protection Output tolerance 2% (AC version) or 4% (C version) at 25 CDescriptionThe L79 series of three-terminal Negative regulators is available in TO-220,TO-220FP and D PAK packages and several fixed Output voltages, making it usefulin a wide range of regulators can provide local on-card regulation, eliminating the distributionproblems associated with single point regulation; furthermore, having the samevoltage option as the L78 positive standard series, they are particularly suited for splitpower supplies. If adequate heat sinking is provided, they can deliver over Aoutput designed primarily as fixed voltage regulators , these devices can be usedwith external components to obtain adjustable voltages and status linkL79 Negative voltage regulatorsL79 DatasheetDS0428 - Rev 24 - January 2019 For further information contact your local STMicroelectronics sales 1.

2 Schematic diagramR1R2R3R4R5R6R7R8R9R10R11R12R13R14 R15R16R17R18R19R20R21Q1Q2Q3Q4Q5Q6Q7Q8Q9Q 10Q11Q12Q13Q14Q16Q17Q18Q19Q20Q21Q22Q15D1 D2D3 OUTINL79 Diagram DS0428 - Rev 24page 2/292 Pin configurationFigure 2. Pin connections (top view)TO-220D PAK (any type)INTO220 FPTO-220 OUTINGNDOUTINGNDL79 Pin configuration DS0428 - Rev 24page 3/293 Maximum ratingsTable 1. Absolute maximum ratingsSymbolParameterValueUnitVIDC input voltage -35 VIOO utput currentInternally limitedPDPower dissipationInternally limitedTSTGS torage temperature range-65 to 150 CTOPO perating junction temperature rangefor L79xxC0 to 150 Cfor L79xxAC0 to 125 Note:Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functionaloperation under these condition is not 2. Thermal dataSymbolParameterD PAKTO-220TO-220 FPUnitRthJCThermal resistance junction-case355 C/WRthJAThermal resistance C/WL79 Maximum ratings DS0428 - Rev 24page 4/294 Test circuitFigure 3.

3 Test circuitCI = F-VI-VICO = 1 FINGNDOUTL79L79 Test circuit DS0428 - Rev 24page 5/295 Electrical characteristicsRefer to the test circuits, TJ = 0 to 125 C, VI = -10 V, IO = 500 mA, CI = F, CO = 1 F unless 3. Electrical characteristics of L7905 ACSymbolParameterTest voltageTJ = 25 voltageIO = -5 mA to -1 A, PO 15 WVI = -8 to -20 VO (1)Line regulationVI = -7 to -25 V, TJ = 25 C100mVVI = -8 to -12 V, TJ = 25 C50 VO (1)Load regulationIO = 5 mA to A, TJ = 25 C100mVIO = 250 to 750 mA, TJ = 25 C50 IdQuiescent currentTJ = 25 C3mA IdQuiescent current changeIO = 5 mA to 1 = -8 to -25 VO/ VTOutput voltage driftIO = 5 CeNOutput noise voltageB = 10 Hz to 100 kHz, TJ = 25 C100 VSVRS upply voltage rejection VI = 10 V, f = 120 Hz5460dBVdDropout voltageIO = 1 A, TJ = 25 C, VO = circuit circuit peak currentTJ = 25 1.

4 Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be takeninto account separately. Pulse testing with low duty cycle is used. Refer to the test circuits, TJ = 0 to 125 C, VI = -10 V, IO = 500 mA, CI = F, CO = 1 F unless 4. Electrical characteristics of L7905 CSymbolParameterTest voltageTJ = 25 voltageIO = -5 mA to -1 A, PO 15 WVI = -8 to -20 VO (1)Line regulationVI = -7 to -25 V, TJ = 25 C100mVVI = -8 to -12 V, TJ = 25 C50 VO (1)Load regulationIO = 5 mA to A, TJ = 25 C100mVIO = 250 to 750 mA, TJ = 25 C50 IdQuiescent currentTJ = 25 C3mAL79 Electrical characteristics DS0428 - Rev 24page 6/29 SymbolParameterTest IdQuiescent current changeIO = 5 mA to 1 = -8 to -25 VO/ TOutput voltage driftIO = 5 CeNOutput noise voltageB = 10 Hz to 100 kHz, TJ = 25 C100 VSVRS upply voltage rejection VI = 10 V, f = 120 Hz5460dBVdDropout voltageIO = 1 A, TJ = 25 C, VO = circuit 1.

5 Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be takeninto account separately. Pulse testing with low duty cycle is used. Refer to the test circuits, TJ = 0 to 125 C, VI = -14 V, IO = 500 mA, CI = F, CO = 1 F unless 5. Electrical characteristics of L7908 CSymbolParameterTest voltageTJ = 25 voltageIO = -5 mA to -1 A, PO 15 WVI = to -23 VO (1)Line regulationVI = to -25 V, TJ = 25 C160mVVI = -11 to -17 V, TJ = 25 C80 VO (1)Load regulationIO = 5 mA to A, TJ = 25 C160mVIO = 250 to 750 mA, TJ = 25 C80 IdQuiescent currentTJ = 25 C3mA IdQuiescent current changeIO = 5 mA to 1 = to -25 V1 VO/ TOutput voltage driftIO = 5 CeNOutput noise voltageB = 10 Hz to 100 kHz, TJ = 25 C175 VSVRS upply voltage rejection VI = 10 V, f = 120 Hz5460dBVdDropout voltageIO = 1 A, TJ = 25 C, VO = circuit 1.

6 Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be takeninto account separately. Pulse testing with low duty cycle is used. L79 Electrical characteristics DS0428 - Rev 24page 7/29 Refer to the test circuits, TJ = 0 to 125 C, VI = -19 V, IO = 500 mA, CI = F, CO = 1 F unless 6. Electrical characteristics of L7912 ACSymbolParameterTest voltageTJ = 25 voltageIO = -5 mA to -1 A, PO 15 WVI = to -27 VO (1)Line regulationVI = to -30 V, TJ = 25 C240mVVI = -16 to -22 V, TJ = 25 C120 VO (1)Load regulationIO = 5 mA to A, TJ = 25 C240mVIO = 250 to 750 mA, TJ = 25 C120 IdQuiescent currentTJ = 25 C3mA IdQuiescent current changeIO = 5 mA to 1 = -15 to -30 V1 VO/ TOutput voltage driftIO = 5 CeNOutput noise voltageB = 10 Hz to 100 kHz, TJ = 25 C200 VSVRS upply voltage rejection VI = 10 V, f = 120 Hz5460dBVdDropout voltageIO = 1 A, TJ = 25 C, VO = 100 circuit circuit peak currentTJ = 25 C, VI = -10 1.

7 Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be takeninto account separately. Pulse testing with low duty cycle is used. Refer to the test circuits, TJ = 0 to 125 C, VI = -19 V, IO = 500 mA, CI = F, CO = 1 F unless 7. Electrical characteristics of L7912 CSymbolParameterTest voltageTJ = 25 voltageIO = -5 mA to -1 A, PO 15 WVI = to -27 VO (1)Line regulationVI = to -30 V, TJ = 25 C240mVVI = -16 to -22 V, TJ = 25 C120 VO (1)Load regulationIO = 5 mA to A, TJ = 25 C240mVIO = 250 to 750 mA, TJ = 25 C120 IdQuiescent currentTJ = 25 C3mAL79 Electrical characteristics DS0428 - Rev 24page 8/29 SymbolParameterTest IdQuiescent current changeIO = 5 mA to 1 = -15 to -30 V1 VO/ TOutput voltage driftIO = 5 CeNOutput noise voltageB = 10 Hz to 100 kHz, TJ = 25 C200 VSVRS upply voltage rejection VI = 10 V, f = 120Hz5460dBVdDropout voltageIO = 1 A, TJ = 25 C, VO = circuit 1.

8 Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be takeninto account separately. Pulse testing with low duty cycle is used. Refer to the test circuits, TJ = 0 to 125 C, VI = -23 V, IO = 500 mA, CI = F, CO = 1 F unless 8. Electrical characteristics of L7915 ACSymbolParameterTest voltageTJ = 25 voltageIO = -5 mA to -1 A, PO 15 WVI = to -30 VO (1)Line regulationVI = to -30 V, TJ = 25 C300mVVI = -20 to -26 V, TJ = 25 C150 VO (1)Load regulationIO = 5 mA to A, TJ = 25 C300mVIO = 250 to 750 mA, TJ = 25 C150 IdQuiescent currentTJ = 25 C3mA IdQuiescent current changeIO = 5 mA to 1 = to -30 V1 VO/ TOutput voltage driftIO = 5 CeNOutput noise voltageB = 10 Hz to 100 kHz, TJ = 25 C250 VSVRS upply voltage rejection VI = 10 V, f = 120 Hz5460dBVdDropout voltageIO = 1 A, TJ = 25 C, VO = 100 circuit circuit peak currentTJ = 25 C, VI = -10 1.

9 Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be takeninto account separately. Pulse testing with low duty cycle is used. L79 Electrical characteristics DS0428 - Rev 24page 9/29 Refer to the test circuits, TJ = 0 to 125 C, VI = -23 V, IO = 500 mA, CI = F, CO = 1 F unless 9. Electrical characteristics of L7915 CSymbolParameterTest voltageTJ = 25 voltageIO = -5 mA to -1 A, PO 15 WVI = to -30 VO (1)Line regulationVI = to -30 V, TJ = 25 C300mVVI = -20 to -26 V, TJ = 25 C150 VO (1)Load regulationIO = 5 mA to A, TJ = 25 C300mVIO = 250 to 750 mA, TJ = 25 C150 IdQuiescent currentTJ = 25 C3mA IdQuiescent current changeIO = 5 mA to 1 = to -30 V1 VO/ TOutput voltage driftIO = 5 CeNOutput noise voltageB = 10 Hz to 100 kHz, TJ = 25 C250 VSVRS upply voltage rejection VI = 10 V, f = 120 Hz5460dBVdDropout voltageIO = 1 A, TJ = 25 C, VO = circuit 1.

10 Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be takeninto account separately. Pulse testing with low duty cycle is used. L79 Electrical characteristics DS0428 - Rev 24page 10/296 Application informationFigure 4. Fixed Output regulatorCI = F-VI-VICO = 1 FINGNDOUTL79 Note:CI is required for stability. For value given, capacitor must be solid tantalum. If aluminium electrolytic are used, atleast ten times value should be selected. CO is required if regulator is located an appreciable distance frompower supply filter. To improve transient response. If large capacitors are used, a high current diode from inputto Output (1N4001 or similar) should be introduced to protect the device from momentary input short 5. Split power supply ( 15 V - 1 A)1N40011N4001L7815L7915* Against potential latch-up problems -15V-20V+20V+ F1 FL79 Application information DS0428 - Rev 24page 11/29 Figure 6.