Datasheet

ManualsBrandsST ManualsIntegrated Circuits (ICs)Linear Fixed Voltage Regulator, 5V, 500mA, DPAK

July 2008 Rev 7 1/29

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

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 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.

DPAK

TO-220

Table 1. Device summary

Part number

L78M05AB L78M10AB

L78M05AC L78M12AB

L78M06AB L78M12AC

L78M08AB L78M15AB

L78M08AC L78M24AB

L78M09AB L78M24AC

www.st.com

Summary of content (29 pages)

PAGE 1
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 TO-220 DPAK with external components to obtain adjustable voltage and currents.
PAGE 2
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 Electrical characteristics 5 Electrical characteristics Table 4. Electrical characteristics of L78M05XX (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) Symbol 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 Table 5. Symbol L78MxxAB - L78MxxAC Electrical characteristics of L78M06XX (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) 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 Table 6. Symbol Electrical characteristics Electrical characteristics of L78M08XX (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) 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 Table 7. Symbol L78MxxAB - L78MxxAC Electrical characteristics of L78M09XX (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) 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 Table 8. Symbol Electrical characteristics Electrical characteristics of L78M10XX (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) 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 Table 9. Symbol L78MxxAB - L78MxxAC Electrical characteristics of L78M12XX (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) 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.
PAGE 13
L78MxxAB - L78MxxAC Table 10. Symbol Electrical characteristics Electrical characteristics of L78M15XX (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) 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 Table 11. Symbol L78MxxAB - L78MxxAC Electrical characteristics of L78M24XX (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) 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 6 Typical performance Figure 8. Dropout voltage vs junction temp. Typical performance 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.
PAGE 16
Typical performance Figure 14. Load transient response Figure 16. Quiescent current vs input voltage 16/29 L78MxxAB - L78MxxAC Figure 15.
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L78MxxAB - L78MxxAC 7 Applications information 7.1 Design considerations Applications information 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.
PAGE 18
Applications information L78MxxAB - L78MxxAC Figure 19. Current boost regulator VBEQ1 R1 = ______________ IREQ-(IQ1/βQ1) VBEQ1 IO = IREG + Q1 (IREG ______) R1 Figure 20. Short-circuit protection Note: 18/29 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.
PAGE 19
L78MxxAB - L78MxxAC 8 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 L78MxxAB - L78MxxAC 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.
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L78MxxAB - L78MxxAC Package mechanical data Figure 21.
PAGE 22
Package mechanical data L78MxxAB - L78MxxAC Figure 22. Drawing dimension DPAK type FUJITSU-Subcon.
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L78MxxAB - L78MxxAC Package mechanical data Figure 23. Drawing dimension DPAK type IDS-Subcon.
PAGE 24
Package mechanical data Table 12. 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 24. DPAK footprint recommended data Table 13. 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.
PAGE 26
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 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.
PAGE 27
L78MxxAB - L78MxxAC Order codes 9 Order codes Table 14.
PAGE 28
Revision history L78MxxAB - L78MxxAC 10 Revision history Table 15. 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 14. 20-Feb-2008 6 Modified: Table 14 on page 27. 15-Jul-2008 7 Modified: Table 14 on page 27.
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