Datasheet

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This is information on a product in full production.

May 2012 Doc ID 2147 Rev 13 1/31

L78MxxAB

L78MxxAC

Precision 500 mA regulators

Datasheet − production data

Features

■ Output current to 0.5 A

■ Output voltages of 5; 6; 8; 9; 10; 12; 15; 24 V

■ Thermal overload protection

■ Short circuit protection

■ Output transition SOA protection

■ ± 2 % output voltage tolerance

■ Guaranteed in extended temperature range

Description

The L78MxxA 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

with external components to obtain adjustable

voltage and currents.

DPAK

TO-220

Table 1. Device summary

Part numbers

L78M05AB L78M12AB

L78M05AC L78M12AC

L78M06AB L78M15AB

L78M08AB L78M24AB

L78M09AB L78M24AC

L78M10AB

www.st.com

Summary of content (31 pages)

PAGE 1
L78MxxAB L78MxxAC Precision 500 mA regulators Datasheet − production data Features ■ Output current to 0.
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Contents L78MxxAB, L78MxxAC Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Test circuits 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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L78MxxAB, L78MxxAC 1 Diagram Figure 1.
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Pin configuration L78MxxAB, L78MxxAC 2 Pin configuration Figure 2. Pin connections (top view) TO-220 Figure 3.
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L78MxxAB, L78MxxAC Maximum ratings 3 Maximum ratings Table 2.
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Test circuits 4 Test circuits Figure 5. DC parameter Figure 6. Load regulation Figure 7.
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L78MxxAB, L78MxxAC 5 Electrical characteristics Electrical characteristics Refer to the test circuits, VI = 10 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified. Table 4. Symbol Electrical characteristics of L78M05XX Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C 4.9 5 5.1 V VO Output voltage IO = 5 to 350 mA, VI = 7 to 20 V 4.8 5 5.
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Electrical characteristics L78MxxAB, L78MxxAC Refer to the test circuits, VI = 11 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified. Table 5. Symbol Electrical characteristics of L78M06XX Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C 5.88 6 6.12 V VO Output voltage IO = 5 to 350 mA, VI = 8 to 21 V 5.75 6 6.
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L78MxxAB, L78MxxAC Electrical characteristics Refer to the test circuits, VI = 14 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified). Table 6. Symbol Electrical characteristics of L78M08XX Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C 7.84 8 8.16 V VO Output voltage IO = 5 to 350 mA, VI = 10.5 to 23 V 7.7 8 8.3 V ΔVO VI = 10.
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Electrical characteristics L78MxxAB, L78MxxAC Refer to the test circuits, VI = 15 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified). Table 7. Symbol Electrical characteristics of L78M09XX Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C 8.82 9 9.18 V VO Output voltage IO = 5 to 350 mA, VI = 11.5 to 24 V 8.64 9 9.36 V ΔVO VI = 11.
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L78MxxAB, L78MxxAC Electrical characteristics Refer to the test circuits, VI = 16 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified. Table 8. Symbol Electrical characteristics of L78M10XX Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C 9.8 10 10.2 V VO Output voltage IO = 5 to 350 mA, VI = 12.5 to 25 V 9.6 10 10.4 V ΔVO VI = 12.
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Electrical characteristics L78MxxAB, L78MxxAC Refer to the test circuits, VI = 19 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified. Table 9. Symbol Electrical characteristics of L78M12XX Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C 11.75 12 12.25 V VO Output voltage IO = 5 to 350 mA, VI = 14.5 to 27 V 11.5 12 12.5 V ΔVO VI = 14.
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L78MxxAB, L78MxxAC Electrical characteristics Refer to the test circuits, VI = 23 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified. Table 10. Symbol Electrical characteristics of L78M15XX Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C 14.7 15 15.3 V VO Output voltage IO = 5 to 350 mA, VI = 17.5 to 30 V 14.4 15 15.6 V ΔVO VI = 17.
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Electrical characteristics L78MxxAB, L78MxxAC Refer to the test circuits, VI = 33 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified. Table 11. Symbol Electrical characteristics of L78M24XX Parameter Test conditions VO Output voltage TJ = 25°C VO Output voltage IO = 5 to 350 mA, VI = 27 to 38 V ΔVO Line regulation ΔVO Load regulation Id ΔId ΔVO/ΔT Quiescent current Quiescent current change Max. Unit 23.5 24 24.
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L78MxxAB, L78MxxAC Typical performance 6 Typical performance Figure 8. Dropout voltage vs. junction temp. Figure 9. Dropout characteristics Figure 10. Peak output current vs. inputoutput differential voltage Figure 11. Output voltage vs. junction temperature Figure 12. Supply voltage rejection vs. frequency Figure 13. Quiescent current vs.
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Typical performance L78MxxAB, L78MxxAC Figure 14. Load transient response Figure 15. Line transient response Figure 16. Quiescent current vs.
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L78MxxAB, L78MxxAC Applications information 7 Applications information 7.1 Design considerations The L78MxxA 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.
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Applications information L78MxxAB, L78MxxAC Figure 19. Current boost regulator VBEQ1 R1 = ______________ IREQ-(IQ1/bQ1) VBEQ1 IO = IREG + Q1 (IREG ______) R1 Figure 20. Short-circuit protection Note: 18/31 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.
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L78MxxAB, L78MxxAC 8 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK is an ST trademark. Table 12. TO-220 mechanical data Type STD - ST Dual Gauge Type STD - ST Single Gauge mm. mm. Dim. Min. Max. Min. Typ. Max. A 4.40 4.60 4.
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Package mechanical data L78MxxAB, L78MxxAC Figure 21. TO-220 (type STD-ST Dual Gauge) package dimensions 0015988_S Note: 20/31 1 Maximum resin gate protrusion: 0.5 mm. 2 Resin gate position is accepted in each of the two positions shown on the drawing, or their symmetrical.
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L78MxxAB, L78MxxAC Package mechanical data Figure 22.
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Package mechanical data L78MxxAB, L78MxxAC Figure 23. TO-220 Dual Gauge (mm.) tube dimensions Figure 24. Tube for TO-220 Single Gauge (mm.
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L78MxxAB, L78MxxAC Package mechanical data Figure 25.
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Package mechanical data L78MxxAB, L78MxxAC Figure 26.
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L78MxxAB, L78MxxAC Package mechanical data Figure 27.
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Package mechanical data Table 13. L78MxxAB, L78MxxAC 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.
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L78MxxAB, L78MxxAC Package mechanical data Figure 28. DPAK footprint recommended data Table 14. Footprint data Values 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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Package mechanical data L78MxxAB, L78MxxAC 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 28/31 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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L78MxxAB, L78MxxAC Order codes 9 Order codes Table 15.
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Revision history L78MxxAB, L78MxxAC 10 Revision history Table 16. Document revision history Date Revision 30-Aug-2006 3 Order codes updated. 05-Oct-2006 4 DPAK mechanical data updated and add footprint data. 10-Dec-2007 5 Modified: Table 15. 20-Feb-2008 6 Modified: Table 15 on page 29. 15-Jul-2008 7 Modified: Table 15 on page 29. 15-Apr-2009 8 Modified: Figure 9 on page 15 and Figure 15 on page 16. 28-Jul-2009 9 Modified: Table 15 on page 29.
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L78MxxAB, L78MxxAC 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.