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L78MXXAB L78MxxAC
Precision 500 mA regulators
Features

Output current to 0.5 A Output voltages of 5; 6; 8; 9; 10; 12; 15; 18; 24 V Thermal overload protection Short circuit protection Output transition SOA protection 2 % Output voltage tolerance Guaranteed in extended temperature range with external components to obtain adjustable voltage and currents.
TO-220 DPAK
Description
The L78MXXAB series of three-terminal positive regulators is available in TO-220 and DPAK packages and with 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. Each type employs internal current limiting, thermal shutdown and safe area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 0.5 A output current. Although designed primarily as fixed voltage regulators, these devices can be used
Table 1.
Device summary
Part number L78M05AB L78M05AC L78M06AB L78M08AB L78M08AC L78M09AB L78M10AB L78M12AB L78M12AC L78M15AB L78M24AB L78M24AC
February 2008
Rev 6
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Contents
L78MXXAB - L78MxxAC
Contents
1 2 3 4 5 6 7 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Test circuits ............................................... 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.1 Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8 9 10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
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L78MXXAB - L78MxxAC
Diagram
1
Figure 1.
Diagram
Block diagram
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Pin configuration
L78MXXAB - L78MxxAC
2
Figure 2.
Pin configuration
Pin connections (top view)
TO-220
DPAK
Figure 3.
Schematic diagram
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L78MXXAB - L78MxxAC
Maximum ratings
3
Table 2.
Symbol VI IO PD TSTG TOP
Maximum ratings
Absolute maximum ratings
Parameter DC input voltage Output current Power dissipation Storage temperature range for L78M00AC Operating junction temperature range for L78M00AB -40 to 125 for VO= 5 to 18V for VO= 20, 24V Value 35 V 40 Internally limited Internally limited -65 to 150 0 to 125 C mA mW C Unit
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-case Thermal resistance junction-ambient TO-220 3 50 DPAK 8 100 Unit C/W C/W
Table 3.
Symbol RthJC RthJA
Figure 4.
Application circuit
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Test circuits
L78MXXAB - L78MxxAC
4
Figure 5.
Test circuits
DC parameter
Figure 6.
Load regulation
Figure 7.
Ripple rejection
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L78MXXAB - L78MxxAC
Electrical characteristics
5
Table 4.
Electrical characteristics
Electrical characteristics of L78M05XX (refer to the test circuits, VI = 10 V, IO = 350 mA, CI = 0.33 F, CO = 0.1 F, TJ = -40 to 125 C (AB), TJ = 0 to 125C (AC) unless otherwise specified)
Parameter Output voltage Output voltage Line regulation TJ = 25C IO = 5 to 350 mA, VI = 7 to 20 V VI = 7 to 25 V, IO = 200 mA, TJ = 25C VI = 8 to 25 V, IO = 200 mA, TJ = 25C Load regulation Quiescent current Quiescent current change Output voltage drift Supply voltage rejection Output noise voltage Dropout voltage Short circuit current Short circuit peak current IO = 5 to 500 mA, TJ = 25C IO = 5 to 200 mA, TJ = 25C TJ = 25C IO = 5 to 350 mA IO = 200 mA, VI = 8 to 25 V IO = 5 mA VI = 8 to 18 V, f = 120Hz, IO = 300mA, TJ = 25C B =10Hz to 100kHz, TJ = 25C TJ = 25C TJ = 25C, VI = 35 V TJ = 25C 62 40 2 300 700 -0.5 Test conditions Min. 4.9 4.8 Typ. 5 5 Max. 5.1 5.2 100 mV 50 100 mV 50 6 0.5 mA 0.8 mV/C dB V V mA mA mA Unit V V
Symbol VO VO VO VO Id Id VO/T SVR eN Vd Isc Iscp
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Electrical characteristics Table 5.
L78MXXAB - L78MxxAC
Electrical characteristics of L78M06XX (refer to the test circuits, VI = 11 V, IO = 350 mA, CI = 0.33 F, CO = 0.1 F, TJ = -40 to 125 C (AB), TJ = 0 to 125 C (AC) unless otherwise specified)
Parameter Output voltage Output voltage Line regulation TJ = 25C IO = 5 to 350 mA, VI = 8 to 21 V VI = 8 to 25 V, IO = 200 mA, TJ = 25C VI = 9 to 25 V, IO = 200 mA, TJ = 25C Load regulation Quiescent current Quiescent current change Output voltage drift Supply voltage rejection Output noise voltage Dropout voltage Short circuit current Short circuit peak current IO = 5 to 500 mA, TJ = 25C IO = 5 to 200 mA, TJ = 25C TJ = 25C IO = 5 to 350 mA IO = 200 mA, VI = 9 to 25 V IO = 5 mA VI = 9 to 19 V, f = 120Hz, IO = 300mA, TJ = 25C B =10Hz to 100kHz TJ = 25C TJ = 25C, VI = 35 V TJ = 25C 59 45 2 270 700 -0.5 Test conditions Min. 5.88 5.75 Typ. 6 6 Max. 6.12 6.3 100 mV 30 120 mV 60 6 0.5 mA 0.8 mV/C dB V V mA mA mA Unit V V
Symbol VO VO VO VO Id Id VO/T SVR eN Vd Isc Iscp
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L78MXXAB - L78MxxAC
Electrical characteristics
Table 6.
Electrical characteristics of L78M08XX (refer to the test circuits, VI = 14 V, IO = 350 mA, CI = 0.33 F, CO = 0.1 F, TJ = -40 to 125 C (AB), TJ = 0 to 125 C (AC) unless otherwise specified)
Parameter Output voltage Output voltage TJ = 25C IO = 5 to 350 mA, VI = 10.5 to 23 V VI = 10.5 to 25 V, IO = 200 mA, TJ = 25C VI = 11 to 25 V, IO = 200 mA, TJ = 25C Test conditions Min. 7.84 7.7 Typ. 8 8 Max. 8.16 8.3 100 mV 30 160 mV 80 6 0.5 mA 0.8 -0.5 56 52 2 250 700 mV/C dB V V mA mA mA Unit V V
Symbol VO VO VO
Line regulation
VO Id Id VO/T SVR eN Vd Isc Iscp
Load regulation Quiescent current Quiescent current change Output voltage drift Supply voltage rejection Output noise voltage Dropout voltage Short circuit current Short circuit peak current
IO = 5 to 500 mA, TJ = 25C IO = 5 to 200 mA, TJ = 25C TJ = 25C IO = 5 to 350 mA IO = 200 mA, VI = 10.5 to 25 V IO = 5 mA VI = 11.5 to 21.5 V, f = 120Hz IO = 300mA, TJ = 25C B =10Hz to 100kHz, TJ = 25C TJ = 25C TJ = 25C, VI = 35 V TJ = 25C
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Electrical characteristics
L78MXXAB - L78MxxAC
Table 7.
Electrical characteristics of L78M09XX (refer to the test circuits, VI = 15 V, IO = 350 mA, CI = 0.33 F, CO = 0.1 F, TJ = -40 to 125 C (AB), TJ = 0 to 125 C (AC) unless otherwise specified)
Parameter Output voltage Output voltage TJ = 25C IO = 5 to 350 mA, VI = 11.5 to 24 V VI = 11.5 to 25 V, IO = 200 mA, TJ = 25C VI = 12 to 25 V, IO = 200 mA, TJ = 25C Test conditions Min. 8.82 8.64 Typ. 9 9 Max. 9.18 9.36 100 mV 30 180 mV 90 6 0.5 mA 0.8 -0.5 56 52 2 250 700 mV/C dB V V mA mA mA Unit V V
Symbol VO VO VO
Line regulation
VO Id Id VO/T SVR eN Vd Isc Iscp
Load regulation Quiescent current Quiescent current change Output voltage drift Supply voltage rejection Output noise voltage Dropout voltage Short circuit current Short circuit peak current
IO = 5 to 500 mA, TJ = 25C IO = 5 to 200 mA, TJ = 25C TJ = 25C IO = 5 to 350 mA IO = 200 mA, VI = 11.5 to 25 V IO = 5 mA VI = 12.5 to 23 V, f = 120Hz, IO = 300mA, TJ = 25C B =10Hz to 100kHz, TJ = 25C TJ = 25C VI = 35 V, TJ = 25C TJ = 25C
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L78MXXAB - L78MxxAC
Electrical characteristics
Table 8.
Electrical characteristics of L78M10XX (refer to the test circuits, VI = 16 V, IO = 350 mA, CI = 0.33 F, CO = 0.1 F, TJ = -40 to 125 C (AB), TJ = 0 to 125 C (AC) unless otherwise specified)
Parameter Output voltage Output voltage TJ = 25C IO = 5 to 350 mA, VI = 12.5 to 25 V VI = 12.5 to 30 V, IO = 200 mA, TJ = 25C VI = 13 to 30 V, IO = 200 mA, TJ = 25C Test conditions Min. 9.8 9.6 Typ. 10 10 Max. 10.2 10.4 100 mV 30 200 mV 100 6 0.5 mA 0.8 -0.5 56 64 2 245 700 mV/C dB V V mA mA mA Unit V V
Symbol VO VO VO
Line regulation
VO Id Id VO/T SVR eN Vd Isc Iscp
Load regulation Quiescent current Quiescent current change Output voltage drift Supply voltage rejection Output noise voltage Dropout voltage Short circuit current Short circuit peak current
IO = 5 to 500 mA, TJ = 25C IO = 5 to 200 mA, TJ = 25C TJ = 25C IO = 5 to 350 mA IO = 200 mA, VI = 12.5 to 30 V IO = 5 mA VI = 13.5 to 24 V, f = 120Hz, IO = 300mA, TJ = 25C B =10Hz to 100kHz, TJ = 25C TJ = 25C VI = 35 V, TJ = 25C TJ = 25C
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Electrical characteristics
L78MXXAB - L78MxxAC
Table 9.
Electrical characteristics of L78M12XX (refer to the test circuits, VI = 19 V, IO = 350 mA, CI = 0.33 F, CO = 0.1 F, TJ = -40 to 125 C (AB), TJ = 0 to 125 C (AC) unless otherwise specified)
Parameter Output voltage Output voltage TJ = 25C IO = 5 to 350 mA, VI = 14.5 to 27 V VI = 14.5 to 30 V, IO = 200 mA, TJ = 25C VI = 16 to 30 V, IO = 200 mA, TJ = 25C Test conditions Min. 11.75 11.5 Typ. 12 12 Max. 12.25 12.5 100 mV 30 240 mV 120 6 0.5 mA 0.8 -1 55 75 2 240 700 mV/C dB V V mA mA mA Unit V V
Symbol VO VO VO
Line regulation
VO Id Id VO/T SVR eN Vd Isc Iscp
Load regulation Quiescent current Quiescent current change Output voltage drift Supply voltage rejection Output noise voltage Dropout voltage Short circuit current Short circuit peak current
IO = 5 to 500 mA, TJ = 25C IO = 5 to 200 mA, TJ = 25C TJ = 25C IO = 5 to 350 mA IO = 200 mA, VI = 14.5 to 30 V IO = 5 mA VI = 15 to 25 V, f = 120Hz, IO = 300mA, TJ = 25C B =10Hz to 100kHz, TJ = 25C TJ = 25C VI = 35 V, TJ = 25C TJ = 25C
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L78MXXAB - L78MxxAC
Electrical characteristics
Table 10.
Electrical characteristics of L78M15XX (refer to the test circuits, VI = 23 V, IO = 350 mA, CI = 0.33 F, CO = 0.1 F, TJ = -40 to 125 C (AB), TJ = 0 to 125 C (AC) unless otherwise specified)
Parameter Output voltage Output voltage TJ = 25C IO = 5 to 350 mA, VI = 17.5 to 30 V VI = 17.5 to 30 V, IO = 200 mA, TJ = 25C VI = 20 to 30 V, IO = 200 mA, TJ = 25C Test conditions Min. 14.7 14.4 Typ. 15 15 Max. 15.3 15.6 100 mV 30 300 mV 150 6 0.5 mA 0.8 -1 54 90 2 240 700 mV/C dB V V mA mA mA Unit V V
Symbol VO VO VO
Line regulation
VO Id Id VO/T SVR eN Vd Isc Iscp
Load regulation Quiescent current Quiescent current change Output voltage drift Supply voltage rejection Output noise voltage Dropout voltage Short circuit current Short circuit peak current
IO = 5 to 500 mA, TJ = 25C IO = 5 to 200 mA, TJ = 25C TJ = 25C IO = 5 to 350 mA IO = 200 mA, VI = 17.5 to 30 V IO = 5 mA VI = 18.5 to 28.5 V, f = 120Hz, IO = 300mA, TJ = 25C B =10Hz to 100kHz, TJ = 25C TJ = 25C VI = 35 V, TJ = 25C TJ = 25C
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Electrical characteristics Table 11.
L78MXXAB - L78MxxAC
Electrical characteristics of L78M24XX (refer to the test circuits, VI = 33 V, IO = 350 mA, CI = 0.33 F, CO = 0.1 F, TJ = -40 to 125 C (AB), TJ = 0 to 125 C (AC) unless otherwise specified)
Parameter Output voltage Output voltage Line regulation TJ = 25C IO = 5 to 350 mA, VI = 27 to 38 V VI = 27 to 38 V, IO = 200 mA, TJ = 25C VI = 28 to 38 V, IO = 200 mA, TJ = 25C Load regulation Quiescent current Quiescent current change Output voltage drift Supply voltage rejection Output noise voltage Dropout voltage Short circuit current Short circuit peak current IO = 5 to 500 mA, TJ = 25C IO = 5 to 200 mA, TJ = 25C TJ = 25C IO = 5 to 350 mA IO = 200 mA, VI = 27 to 38 V IO = 5 mA VI = 28 to 38 V, f = 120Hz, IO = 300mA, TJ = 25C B =10Hz to 100kHz, TJ = 25C TJ = 25C VI = 35 V, TJ = 25C TJ = 25C 50 170 2 240 700 -1.2 Test conditions Min. 23.5 23 Typ. 24 24 Max. 24.5 25 100 mV 30 480 mV 240 6 0.5 mA 0.8 mV/C dB V V mA mA mA Unit V V
Symbol VO VO VO VO Id Id VO/T SVR eN Vd Isc Iscp
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L78MXXAB - L78MxxAC
Typical performance
6
Figure 8.
Typical performance
Dropout voltage vs junction temp. Figure 9. Dropout characteristics
Figure 10. Peak output current vs input-output Figure 11. Output voltage vs junction differential voltage temperature
Figure 12. Supply voltage rejection vs freq.
Figure 13. Quiescent current vs junction temp.
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Typical performance
L78MXXAB - L78MxxAC
Figure 14. Load transient response
Figure 15. Line transient response
Figure 16. Quiescent current vs input voltage
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L78MXXAB - L78MxxAC
Applications information
7
7.1
Applications information
Design considerations
The L78MXXAB series of fixed voltage regulators are designed with thermal overload protection that shuts down the circuit when subjected to an excessive power overload condition, internal short-circuit protection that limits the maximum current the circuit will pass, and output transistor Safe-Area compensation that reduces the output short-circuit as the voltage across the pass transistor is increased. In many low current applications, compensation capacitors are not required. However, it is recommended that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long wire lengths, or if the output load capacitance is large. An input bypass capacitor should be selected to provide good high-frequency characteristics to insure stable operation under all load conditions. A 0.33 F or larger tantalum, mylar, or other capacitor having low internal impedance at high frequencies should be chosen. The bypass capacitor should be mounted with the shortest possible leads directly across the regulators input terminals. Normally good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead.
Figure 17. Current regulator
IO = VXX/R1+Id
Figure 18. Adjustable output regulator
VO = 7.0V to 20V VI - VO 2.0V
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Applications information
L78MXXAB - L78MxxAC
Figure 19. Current boost regulator
VBEQ1 R1 = ______________ IREQ-(IQ1/Q1) VBEQ1 IO = IREG + Q1 (IREG ______) R1
Figure 20. Short-circuit protection
Note:
The circuit of Figure 19 can be modified to provide supply protection against short circuits by adding a short-circuit sense resistor, RSC, and an additional PNP transistor. The current sensing PNP must be able to handle the short-circuit current of the three-terminal regulator. Therefore, a four-ampere plastic power transistor is specified.
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L78MXXAB - L78MxxAC
Package mechanical data
8
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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.
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Package mechanical data
L78MXXAB - L78MxxAC
TO-220 mechanical data
Dim. A C D D1 E F F1 F2 G G1 H2 L2 L4 L5 L6 L7 L9 DIA. 13.0 2.65 15.25 6.2 3.5 3.75 0.49 0.61 1.14 1.14 4.95 2.4 10.0 16.4 14.0 2.95 15.75 6.6 3.93 3.85 0.511 0.104 0.600 0.244 0.137 0.147 mm. Min. 4.40 1.23 2.40 1.27 0.70 0.88 1.70 1.70 5.15 2.7 10.40 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.620 0.260 0.154 0.151 Typ. Max. 4.60 1.32 2.72 Min. 0.173 0.048 0.094 0.050 0.027 0.034 0.067 0.067 0.203 0.106 0.409 inch. Typ. Max. 0.181 0.051 0.107
P011C
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L78MXXAB - L78MxxAC
Package mechanical data
Figure 21. Drawing dimension DPAK type STD-ST
0068772/G
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Package mechanical data
L78MXXAB - L78MxxAC
Figure 22. Drawing dimension DPAK type FUJITSU-Subcon.
0068772/G
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L78MXXAB - L78MxxAC
Package mechanical data
Figure 23. Drawing dimension DPAK TYPE IDS-Subcon.
0068772/G
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Package mechanical data
L78MXXAB - L78MxxAC
Table 12.
DPAK mechanical data
Type STD-ST Type FUJITSU-Subcon. mm. Max. 2.40 1.10 0.23 0.90 5.40 0.60 0.60 6.20 5.10 6.40 4.70 2.28 4.40 9.35 1.00 2.80 0.80 0.60 0.20 0 8 0 1.00 1.03 0.70 0.40 8 0 1.13 0.90 4.60 10.10 9.90 1.40 10.30 1.60 2.23 6.60 Min. 2.25 0.96 0 0.76 5.28 0.46 0.46 6.05 5.27 6.55 6.60 4.77 2.28 2.33 4.51 9.40 0.90 2.50 0.89 0.64 0.20 8 2.65 1.27 1.02 Typ. 2.30 Max. 2.35 1.06 0.10 0.86 5.38 0.56 0.56 6.15 5.47 6.65 6.35 4.70 2.28 4.61 10.42 Min. 2.19 0.89 0.03 0.64 5.21 0.46 0.46 5.97 5.20 6.73 Type IDS-Subcon. mm. Typ. Max. 2.38 1.14 0.23 0.88 5.46 0.58 0.58 6.22
Dim. Min. A A1 A2 b b4 c c2 D D1 E E1 e e1 H L L1 L2 L4 R V2 2.20 0.90 0.03 0.64 5.20 0.45 0.48 6.00
mm. Typ.
Note:
The DPAK package coming from the two subcontractors (Fujitsu and IDS) are fully compatible with the ST's package suggested footprint.
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L78MXXAB - L78MxxAC
Package mechanical data
Figure 24. DPAK footprint recommended data
Table 13.
Footprint data
Values Dim. A B C D E F G mm. 6.70 6.70 1.8 3.0 1.60 2.30 2.30 inch. 0.264 0.64 0.070 0.118 0.063 0.091 0.091
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Package mechanical data
L78MXXAB - L78MxxAC
Tape & reel DPAK-PPAK mechanical data
mm. Dim. Min. A C D N T Ao Bo Ko Po P 6.80 10.40 2.55 3.9 7.9 6.90 10.50 2.65 4.0 8.0 12.8 20.2 60 22.4 7.00 10.60 2.75 4.1 8.1 0.268 0.409 0.100 0.153 0.311 0.272 0.413 0.104 0.157 0.315 13.0 Typ. Max. 330 13.2 0.504 0.795 2.362 0.882 0.2.76 0.417 0.105 0.161 0.319 0.512 Min. Typ. Max. 12.992 0.519 inch.
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L78MXXAB - L78MxxAC
Order codes
9
Table 14.
Order codes
Order codes
Packaging Part numbers TO-220 L78M05AB L78M05AC L78M06AB L78M08AB L78M08AC L78M09AB L78M10AB L78M12AB L78M12AC L78M15AB L78M24AB L78M24AC L78M15ABV L78M24ABV L78M12ABV L78M09ABV L78M08ABV L78M05ABV DPAK L78M05ABDT-TR L78M05ACDT-TR L78M06ABDT-TR L78M08ABDT-TR L78M08ACDT-TR L78M09ABDT-TR L78M10ABDT-TR L78M12ABDT-TR L78M12ACDT-TR L78M15ABDT-TR L78M24ABDT-TR L78M24ACDT-TR Output voltage 5V 5V 6V 8V 8V 9V 10 V 12 V 12 V 15 V 24 V 24 V
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Revision history
L78MXXAB - L78MxxAC
10
Table 15.
Date
Revision history
Document revision history
Revision 3 4 5 6 Order Codes updated. DPAK mechanical data updated and add footprint data. Modified: Table 14. Modified: Table 14 on page 27. Changes
30-Aug-2006 05-Oct-2006 10-Dec-2007 20-Feb-2008
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L78MXXAB - L78MxxAC
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