Negative voltage regulators
Features
■■■■■
Output current up to 1.5 A
Output voltages of -5; -8; -12; -15; -20 VThermal overload protectionShort circuit protection
Output transition SOA protection
TO-220TO-220FPDescription
The L79XXC series of three-terminal negative regulators is available in TO-220, TO-220FP and D2PAK packages and several fixed output voltages, making it useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation; furthermore, having the same voltage option as the L78XX positive standard series, they are particularly suited for split power supplies. If adequate heat sinking is provided, they can deliver over 1.5 A output current.
Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents.
D2PAK
Table 1.Device summary
Order codes
Output voltages-5 V-8 V
L7912CD2T-TRL7915CD2T-TRL7920CD2T-TR (1)
L7912CPL7915CP
-12 V-15 V-20 V
Part numbers
TO-220(A type)L7905CVL7908CVL7912CVL7915CV
D2PAKL7905CD2T-TR
TO-220FPL7905CP
L7905CL7908CL7912CL7915CL7920C
1. Available on request.
July 2008Rev 161/21
www.st.com
21ContentsL79xxC
Contents
12345678
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21
L79xxCDiagram
1 Diagram
Figure 1. Schematic diagram3/21
Pin configurationL79xxC
2
Figure 2. Pin configuration
Pin connections (top view)TO-220TO220FPD2PAK (any type)4/21
L79xxCMaximum ratings
3 Maximum ratings
Table 2.
SymbolVIIOPDTSTGTOP
DC input voltageOutput currentPower dissipation
Storage temperature range
Operating junction temperature range
Absolute maximum ratings
Parameter
for VO= 5 to 18Vfor VO= 20, 24V
Value-35-40Internally limitedInternally limited-65 to 1500 to 150
°C°CUnitV
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.Thermal data
Parameter
Thermal resistance junction-caseThermal resistance junction-ambient
D2PAK362.5
TO-220350
TO-220FP
560
Unit°C/W°C/W
Table 3.
SymbolRthJCRthJA
5/21
Test circuitL79xxC
4
Figure 3. Test circuit
Test circuit6/21
L79xxCElectrical characteristics
5
Table 4.
SymbolVOVOΔVO(1)ΔVO(1)IdΔIdΔVO/ΔTeNSVRVdIsc
Electrical characteristics
Electrical characteristics of L7905C (refer to the test circuits, TJ = 0 to 125 °C, VI = -10 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
Parameter
Output voltageOutput voltageLine regulation
TJ = 25°C
IO = -5 mA to -1 A, PO ≤ 15 WVI = -8 to -20 V
VI = -7 to -25 V, TJ = 25°CVI = -8 to -12 V, TJ = 25°CIO = 5 mA to 1.5 A, TJ = 25°CIO = 250 to 750 mA, TJ = 25°CTJ = 25°CIO = 5 mA to 1 AVI = -8 to -25 VIO = 5 mA
B = 10Hz to 100kHz, TJ = 25°CΔVI = 10 V, f = 120Hz
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
54
-0.4100601.42.1
Test conditions
Min.-4.8-4.75
Typ.-5-5
Max.-5.2-5.25100501005030.51.3
UnitVVmV
Load regulationQuiescent currentQuiescent current changeOutput voltage driftOutput noise voltageSupply voltage rejectionDropout voltageShort circuit current
mVmAmAmV/°CµVdBVA
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 cycle is used.
7/21
Electrical characteristicsTable 5.
SymbolVOVOΔVO(1)ΔVO(1)IdΔIdΔVO/ΔTeNSVRVdIsc
L79xxC
Electrical characteristics of L7908C (refer to the test circuits, TJ = 0 to 125 °C, VI = -14 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
Parameter
Output voltageOutput voltageLine regulation
TJ = 25°C
IO = -5 mA to -1 A, PO ≤ 15 WVI = -11.5 to -23 V
VI = -10.5 to -25 V, TJ = 25°CVI = -11 to -17 V, TJ = 25°CIO = 5 mA to 1.5 A, TJ = 25°CIO = 250 to 750 mA, TJ = 25°CTJ = 25°CIO = 5 mA to 1 AVI = -11.5 to -25 VIO = 5 mA
B = 10Hz to 100kHz, TJ = 25°CΔVI = 10 V, f = 120Hz
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
54
-0.6175601.11.5
Test conditions
Min.-7.7-7.6
Typ.-8-8
Max.-8.3-8.4160801608030.51
UnitVVmV
Load regulationQuiescent currentQuiescent current changeOutput voltage driftOutput noise voltageSupply voltage rejectionDropout voltageShort circuit current
mVmAmAmV/°CµVdBVA
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 cycle is used.
Table 6.
SymbolVOVOΔVO(1)ΔVO(1)IdΔIdΔVO/ΔTeNSVRVdIsc
Electrical characteristics of L7912C (refer to the test circuits, TJ = 0 to 125 °C, VI = -19 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
Parameter
Output voltageOutput voltageLine regulation
TJ = 25°C
IO = -5 mA to -1 A, PO ≤ 15 WVI = -15.5 to -27 V
VI = -14.5 to -30 V, TJ = 25°CVI = -16 to -22 V, TJ = 25°CIO = 5 mA to 1.5 A, TJ = 25°CIO = 250 to 750 mA, TJ = 25°CTJ = 25°CIO = 5 mA to 1 AVI = -15 to -30 VIO = 5 mA
B = 10Hz to 100kHz, TJ = 25°CΔVI = 10 V, f = 120Hz
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
54
-0.8200601.11.5
Test conditions
Min.-11.5-11.4
Typ.-12-12
Max.-12.5-12.624012024012030.51
UnitVVmV
Load regulationQuiescent currentQuiescent current changeOutput voltage driftOutput noise voltageSupply voltage rejectionDropout voltageShort circuit current
mVmAmAmV/°CµVdBVA
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 cycle is used.
8/21
L79xxCTable 7.
SymbolVOVOΔVO(1)ΔVO(1)IdΔIdΔVO/ΔTeNSVRVdIsc
Electrical characteristics
Electrical characteristics of L7915C (refer to the test circuits, TJ = 0 to 125 °C, VI = -23 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
Parameter
Output voltageOutput voltageLine regulation
TJ = 25°C
IO = -5 mA to -1 A, PO ≤ 15 WVI = -18.5 to -30 V
VI = -17.5 to -30 V, TJ = 25°CVI = -20 to -26 V, TJ = 25°CIO = 5 mA to 1.5 A, TJ = 25°CIO = 250 to 750 mA, TJ = 25°CTJ = 25°CIO = 5 mA to 1 AVI = -18.5 to -30 VIO = 5 mA
B = 10Hz to 100kHz, TJ = 25°CΔVI = 10 V, f = 120Hz
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
54
-0.9250601.11.3
Test conditions
Min.-14.4-14.3
Typ.-15-15
Max.-15.6-15.730015030015030.51
UnitVVmV
Load regulationQuiescent currentQuiescent current changeOutput voltage driftOutput noise voltageSupply voltage rejectionDropout voltageShort circuit current
mVmAmAmV/°CµVdBVA
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 cycle is used.
Table 8.
SymbolVOVOΔVO(1)ΔVO(1)IdΔIdΔVO/ΔTeNSVRVdIsc
Electrical characteristics of L7920C (refer to the test circuits, TJ = 0 to 125 °C, VI = -29 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified)
Parameter
Output voltageOutput voltageLine regulation
TJ = 25°C
IO = -5 mA to -1 A, PO ≤ 15 WVI = -24 to -35 V
VI = -23 to -35 V, TJ = 25°CVI = -26 to -32 V, TJ = 25°CIO = 5 mA to 1.5 A, TJ = 25°CIO = 250 to 750 mA, TJ = 25°CTJ = 25°CIO = 5 mA to 1 AVI = -24 to -35 VIO = 5 mA
B = 10Hz to 100kHz, TJ = 25°CΔVI = 10 V, f = 120Hz
IO = 1 A, TJ = 25°C, ΔVO = 100 mV
54
-1.1350601.10.9
Test conditions
Min.-19.2-19
Typ.-20-20
Max.-20.8-2140020040020030.51
UnitVVmV
Load regulationQuiescent currentQuiescent current changeOutput voltage driftOutput noise voltageSupply voltage rejectionDropout voltageShort circuit current
mVmAmAmV/°CµVdBVA
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 cycle is used.
9/21
Application informationL79xxC
6 Application information
Figure 4. Fixed output regulator1.To specify an output voltage, substitute voltage value for \"XX\".
2.Required for stability. For value given, capacitor must be solid tantalum. If aluminium electrolytic are used,
at least ten times value should be selected. C1 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
(1N4001 or similar) should be introduced to protect the device from momentary input short circuit.
Figure 5. Split power supply (± 15 V - 1 A) (*) Against potential latch-up problems.
10/21
L79xxC
Figure 6.
Application information
Circuit for increasing output voltage
VO=VXX(R1+R2)/R2VXX/R2 > 3Id
GNDINOUTC3 Optional for improved transient response and ripple rejection.
Figure 7.
High current negative regulator (-5 V / 4 A with 5 A current limiting)
INOUTGND11/21
Package mechanical dataL79xxC
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
12/21
L79xxC
Package mechanical data
TO-220 (A type) mechanical dataDim.Abb1cDEee1FH1J1LL1L20L30φPQ3.752.65mm.Min.4.400.611.150.4915.2510.02.44.951.236.22.4013.03.516.428.93.852.950.1480.104Typ.Max.4.600.881.700.7015.7510.402.75.151.326.62.7214.03.93Min.0.1730.0240.0450.0190.6000.3940.0940.1950.0480.2440.0940.5120.1380.6461.1380.1520.116inch.Typ.Max.0.1810.0350.0670.0280.6200.4090.1060.2030.0520.2600.1070.5510.1550015988/N13/21Package mechanical dataL79xxC
TO-220FP mechanical dataDim.ABDEFF1F2GG1HL2L3L4L5L6L7DIA.28.69.82.915.993mm.Min.4.402.52.50.450.751.151.154.952.410.01630.610.63.616.49.33.21.1260.3850.1140.6260.3540.118TypMax.4.602.72.750.7011.501.505.22.710.40Min.0.1730.0980.0980.0170.0300.0450.0450.1940.0940.3930.6301.2040.4170.1420.6450.3660.126inch.Typ.Max.0.1810.1060.1080.0270.0390.0590.0590.2040.1060.4097012510A-H14/21L79xxCPackage mechanical data
Figure 8. Drawing dimension D2PAK (type STD-ST)0079457/L15/21
Package mechanical dataL79xxC
Figure 9. Drawing dimension D2PAK (type WOOSEOK-subcon.)0079457/L16/21
L79xxCPackage mechanical data
Table 9.
D2PAK mechanical data
Type STD-ST
Type WOOSEOK-subcon.
mm.
Max.4.600.230.931.700.601.369.35
Min.4.3000.701.170.451.2597.50
10.40
9.807.50
2.54
4.88152.492.291.271.30
0.4
0°
8°
0°
5.2815.852.692.791.401.75
152.201.7911.20
0.30
3°
2.545.0815.30
15.602.602.791.401.6010.20
0.501.309.20Typ.
Max.4.700.200.901.370.601.409.40
Dim.
Min.
AA1bb2cc2DD1EE1ee1HJ1LL1L2RV2
4.400.030.701.140.451.238.957.50108.50
mm.Typ.
Note:
The D2PAK package coming from the subcontractor WOOSEOK is fully compatible with the ST's package suggested footprint.
17/21
Package mechanical dataL79xxC
Figure 10.D2PAK footprint recommended data Table 10.Footprint data
Values
Dim.ABCDEFG
mm.12.209.7516.903.501.602.545.08
inch.0.4800.3840.6650.1380.0630.1000.200
18/21
L79xxCPackage mechanical data
Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical datamm.Dim.Min.ACDNTAoBoKoPoP10.5015.704.803.911.910.615.804.904.012.012.820.26014.410.7015.905.004.112.10.4130.6180.1890.1530.4680.4170.6220.1930.1570.47213.0Typ.Max.18013.20.5040.7952.3620.5670.4210.6260.1970.1610.4760.512Min.Typ.Max.7.0860.519inch.19/21
Revision historyL79xxC
8
Table 11.
Date
Revision history
Document revision history
Revision
910111213141516
Order codes updated Table 3.
Add new order codes (TO-220 E Type) on Table 3.D2PAK mechanical data updated and add footprint data.Order codes updated.
Modified: Figure3, Figure4, Figure6 and Figure7.Modified: Table1.
Modified: Table1 on page1.Modified: Table1 on page1.
Changes
22-Jun-200431-Aug-200519-Jan-200706-Jun-200725-Oct-200705-Dec-200718-Feb-200815-Jul-2008
20/21
L79xxC
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