Datasheet

ManualsBrandsST ManualsIntegrated Circuits (ICs)Linear Fixed Voltage Regulator, 12V, 500mA, TO-220

July 2008 Rev 12 1/29

L78MxxC

Positive voltage regulators

Features

■ Output current to 0.5 A

■ Output voltages of 5; 6; 8; 9; 12; 15; 24 V

■ Thermal overload protection

■ Short circuit protection

■ Output transition SOA protection

Description

The L78Mxx series of three-terminal positive

regulators is available in TO-220, TO-220FP,

DPAK and IPAK 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 shut-down 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 with external

components to obtain adjustable voltage and

currents.

TO-220FP

DPAK

TO-220

IPAK

Table 1. Device summary

Part numbers

L78M05C L78M12C

L78M06C L78M15C

L78M08C L78M24C

L78M09C

www.st.com

Summary of content (29 pages)

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L78MxxC Positive voltage regulators Features ■ Output current to 0.5 A ■ Output voltages of 5; 6; 8; 9; 12; 15; 24 V ■ Thermal overload protection ■ Short circuit protection ■ Output transition SOA protection TO-220 TO-220FP Description The L78Mxx series of three-terminal positive regulators is available in TO-220, TO-220FP, DPAK and IPAK packages and with several fixed output voltages, making it useful in a wide range of applications.
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Contents L78MxxC Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Test circuits 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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L78MxxC Diagram 1 Diagram Figure 1.
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Pin configuration L78MxxC 2 Pin configuration Figure 2. Pin connections (top view) Figure 3.
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L78MxxC Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value for VO= 5 to 18V 35 for VO= 20, 24V 40 Unit VI DC input voltage IO Output current Internally limited mA PD Power dissipation Internally limited mW -65 to 150 °C 0 to 150 °C TSTG Storage temperature range TOP Operating junction temperature range V Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
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Test circuits 4 Test circuits Figure 5. DC parameter Figure 6. Load regulation Figure 7.
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L78MxxC Electrical characteristics 5 Electrical characteristics Table 4. Electrical characteristics of L78M05C (refer to the test circuits, TJ = 25 °C, VI = 10 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified) Symbol Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation Id ΔId ΔVO/ΔT Test conditions IO = 5 to 350 mA, VI = 7 to 20 V V 4.75 5 5.
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Electrical characteristics Table 6. Symbol Electrical characteristics of L78M08C (refer to the test circuits, TJ = 25 °C, VI = 14 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified) Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation Id ΔId ΔVO/ΔT L78MxxC Test conditions IO = 5 to 350 mA, VI = 10.5 to 23 V 7.6 8 8.4 V 80 mV mV Quiescent current Quiescent current change 6 IO = 5 to 350 mA 0.5 IO = 200 mA, VI = 10.5 to 25 V 0.
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L78MxxC Table 8. Symbol Electrical characteristics Electrical characteristics of L78M12C (refer to the test circuits, TJ = 25 °C, VI = 19 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified) Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation Id ΔId ΔVO/ΔT Test conditions IO = 5 to 350 mA, VI = 14.5 to 27 V V 11.4 12 12.6 V IO = 5 to 200 mA, TJ = 25°C 120 mV mV Quiescent current Quiescent current change 6 IO = 5 to 350 mA 0.
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Electrical characteristics Table 10. Symbol Electrical characteristics of L78M24C (refer to the test circuits, TJ = 25 °C, VI = 23 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified) Parameter VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation Id ΔId ΔVO/ΔT L78MxxC Test conditions IO = 5 to 350 mA, VI = 27 to 38 V Max. Unit 23 24 25 V 22.8 24 25.
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L78MxxC Typical performance 6 Typical performance Figure 8. 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 Figure 14. Load transient response L78MxxC Figure 15. Line transient response Figure 16. Quiescent current vs input voltage Figure 17. Fixed output regulator 1. To specify an output voltage, substitute voltage value for "XX". 2. Although no output capacitor is need for stability, it does improve transient response. 3. Required if regulator is locate an appreciable distance from power supply filter.
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L78MxxC Typical performance Figure 18. Constant current regulator IO = VXX/R1+Id Figure 19. Circuit for increasing output voltage IR1 ≥ 5 Id VO = VXX(1+R2/R1)+IdR2 Figure 20.
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Typical performance Figure 21. 0.5 to 10 V regulator VO=VXXR4/R1 Figure 22. High current voltage regulator VBEQ1 R1 = ______________ IREQ-(IQ1/βQ1) VBEQ1 IO = IREG + Q1 (IREG ______) R1 Figure 23.
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L78MxxC Typical performance Figure 24. Tracking voltage regulator Figure 25. High input voltage circuit VIN = VI - (VZ + VBE) Figure 26.
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Typical performance L78MxxC Figure 27. Power AM modulator (unity voltage gain, IO ≤ 0.5) Note: The circuit performs well up to 100 kHz. Figure 28. Adjustable output voltage with temperature compensation VO = VXX (1+R2/R1) + VBE Note: 16/29 Q2 is connected as a diode in order to compensate the variation of the Q1 VBE with the temperature. C allows a slow rise time of the VO.
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L78MxxC 7 Package mechanical data 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.
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Package mechanical data L78MxxC TO-220 mechanical data Dim. mm. Min. Typ. inch. Max. Min. Typ. Max. A 4.40 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 0.107 0.70 0.019 0.027 D1 E 1.27 0.49 0.050 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 0.409 L2 16.4 0.645 L4 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.25 15.
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L78MxxC Package mechanical data TO-220FP mechanical data Dim. mm. Min. Max. Min. A 4.40 4.60 0.173 0.181 B 2.5 2.7 0.098 0.106 D 2.5 2.75 0.098 0.108 E 0.45 0.70 0.017 0.027 F 0.75 1 0.030 0.039 F1 1.15 1.50 0.045 0.059 F2 1.15 1.50 0.045 0.059 G 4.95 5.2 0.194 0.204 G1 2.4 2.7 0.094 0.106 H 10.0 10.40 0.393 0.409 L2 Typ inch. 16 Typ. Max. 0.630 L3 28.6 30.6 1.126 1.204 L4 9.8 10.6 0.385 0.417 L5 2.9 3.6 0.114 0.142 L6 15.9 16.
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Package mechanical data L78MxxC Figure 29.
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L78MxxC Package mechanical data Figure 30. Drawing dimension DPAK (type FUJITSU-subcon.
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Package mechanical data L78MxxC Figure 31. Drawing dimension DPAK (type IDS-subcon.
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L78MxxC Table 11. Package mechanical data DPAK mechanical data Dim. Min. Type STD-ST Type FUJITSU-Subcon. Type IDS-Subcon mm. mm. mm. Typ. Max. Min. Typ. Max. Min. Typ. Max. 2.30 2.35 2.19 2.38 A 2.20 2.40 2.25 A1 0.90 1.10 0.96 1.06 0.89 1.14 A2 0.03 0.23 0 0.10 0.03 0.23 b 0.64 0.90 0.76 0.86 0.64 0.88 b4 5.20 5.40 5.28 5.38 5.21 5.46 c 0.45 0.60 0.46 0.56 0.46 0.58 c2 0.48 0.60 0.46 0.56 0.46 0.58 D 6.00 6.20 6.05 6.15 5.97 6.
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Package mechanical data L78MxxC Figure 32. DPAK footprint recommended data Table 12. Footprint data Values 24/29 Dim. mm. inch. A 6.70 0.264 B 6.70 0.64 C 1.8 0.070 D 3.0 0.118 E 1.60 0.063 F 2.30 0.091 G 2.30 0.
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L78MxxC Package mechanical data IPAK mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 2.2 2.4 0.086 0.094 A1 0.9 1.1 0.035 0.043 B 0.64 0.9 0.025 0.035 B2 5.2 5.4 0.204 0.212 B3 0.95 B5 0.037 0.3 B6 0.012 0.95 0.037 C 0.45 0.6 0.017 0.023 C2 0.48 0.6 0.019 0.023 D 6 6.2 0.236 0.244 E 6.4 6.6 0.252 0.260 G 4.4 4.6 0.173 0.181 H 15.9 16.3 0.626 0.641 L 9 9.4 0.354 0.370 L1 0.8 1.2 0.031 0.047 L2 0.8 1 0.031 0.
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Package mechanical data L78MxxC Tape & reel DPAK-PPAK mechanical data mm. inch. Dim. Min. Typ. A Min. Typ. 330 13.0 13.2 Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 26/29 Max. 0.504 0.512 22.4 0.519 0.882 Ao 6.80 6.90 7.00 0.268 0.272 0.2.76 Bo 10.40 10.50 10.60 0.409 0.413 0.417 Ko 2.55 2.65 2.75 0.100 0.104 0.105 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 7.9 8.0 8.1 0.311 0.315 0.
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L78MxxC Order codes 8 Order codes Table 13. Order codes Packages TO-220 TO-220FP DPAK IPAK Output voltage L78M05CV L78M05CP L78M05CDT-TR L78M05CDT-1 5V L78M06CDT-TR L78M06CDT-1 (1) 6V L78M08CDT-TR L78M08CDT-1 (1) 8V L78M09CDT-1 (1) 9V L78M08CV L78M09CV L78M09CDT-TR L78M12CV L78M12CDT-TR L78M15CV L78M24CV 12 V L78M15CDT-TR L78M24CP (1) L78M24CDT-TR 15 V L78M24CDT-1 (1) 24 V 1.
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Revision history L78MxxC 9 Revision history Table 14. Document revision history Date Revision 21-Jun-2004 6 Document updating. 30-Aug-2006 7 Order codes has been updated and new template. 29-Nov-2006 8 DPAK mechanical data has been updated and add footprint data. 06-Jun-2007 9 Order codes has been updated. 10-Dec-2007 10 Added Table 1. 19-Feb-2008 11 Modified: Table 1 on page 1. 15-Jul-2008 12 Modified: Table 1 on page 1 and Table 13 on page 27.
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L78MxxC Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.