Document
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
TO-220 DPAK
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.
Table 1.
Device summary
Part numbers L78M05AB L78M05AC L78M06AB L78M08AB L78M09AB L78M10AB L78M12AB L78M12AC L78M15AB L78M24AB L78M24AC
May 2012
This is information on a product in full production.
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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
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Diagram
1 Di
Figure 1.
agram
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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Maximum ratings
3 Maxi
Table 2.
Symbol VI IO PD TSTG TOP
mum 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 18 V for VO = 20, 24 V 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 5 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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Electrical characteristics
5 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 VO VO ΔVO ΔVO Id ΔId ΔVO/ΔT SVR eN Vd Isc Iscp
Electrical characteristics of L78M05XX
Parameter Output voltage Output voltage Line regulation TJ = 25°C IO = 5 to 350 mA, VI = 7 to 20 V VI = 7 to 25 V, IO = 200 mA, TJ = 25°C VI = 8 to 25 V, IO = 200 mA, TJ = 25°C 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 = 25°C IO = 5 to 200 mA, TJ = 25°C TJ = 25°C 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 = 25°C B =10Hz to 100kHz, TJ = 25°C TJ = 25°C TJ = 25°C, VI = 35 V TJ = 25°C 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 µV V mA mA mA Unit V V
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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.