ST L78L33C, L78L08AC, L78L15C, L78L33AC, L78L08AB User Manual

L78LxxAB

L78LxxAC - L78LxxC

Positive voltage regulators

Features

■Output current up to 100 mA

■Output voltages of 3.3; 5; 6; 8; 9; 10; 12; 15; 18; 24 V

■Thermal overload protection

■Short circuit protection

■No external components are required

■Available in either ± 4 % (AC) or ± 8 % (C) selection

Description

The L78Lxx series of three-terminal positive regulators employ internal current limiting and thermal shutdown, making them essentially indestructible. If adequate heat-sink is provided, they can deliver up to 100 mA output current. They are intended as fixed voltage regulators in a wide range of applications including local or oncard regulation for elimination of noise and distribution problems associated with single-point regulation. In addition, they can be used with power pass elements to make high-current voltage regulators. The L78Lxx series used as Zener diode/resistor combination replacement, offers an effective output impedance improvement

TO-92

SO-8

SOT-89

of typically two orders of magnitude, along with lower quiescent current and lower noise.

Table 1.	Device summary
		Part numbers
	L78L33C	L78L08AC	L78L15C
	L78L33AC	L78L08AB	L78L15AC
	L78L33AB	L78L09C	L78L15AB
	L78L05C	L78L09AC	L78L18C
	L78L05AC	L78L09AB	L78L18AC
	L78L05AB	L78L10AC	L78L24C
	L78L06AC	L78L12C	L78L24AC
	L78L06AB	L78L12AC	L78L24AB
	L78L08C	L78L12AB
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Contents	L78LxxAB - L78LxxAC - L78LxxC

Contents

1	Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 3
2	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 4
3	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
4	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
5	Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
6	Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
7	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	20
8	Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	28
9	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29

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L78LxxAB - L78LxxAC - L78LxxC	Diagram

1 Diagram

Figure 1. Schematic diagram

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Pin configuration	L78LxxAB - L78LxxAC - L78LxxC

2 Pin configuration

Figure 2. Pin connection (top view, bottom view for TO-92)

PIN 1 = VOUT

PIN 2 = GND

PIN 3 = VIN

SO-8

SOT-89

TO-92

Figure 3. Test circuits

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L78LxxAB - L78LxxAC - L78LxxC	Maximum ratings

	3	Maximum ratings
	Table 2.	Absolute maximum ratings
	Symbol	Parameter		Value	Unit
			VO= 3.3 to 9 V	30
	VI	DC Input voltage	VO= 12 to 15 V	35	V
			VO= 18 to 24 V	40
	IO	Output current		100	mA
	PD	Power dissipation		Internally limited (1)	mW
	TSTG	Storage temperature range		-65 to 150	°C
	TOP	Operating junction temperature range	for L78L00AC	0 to 150	°C
			for L78L00AB	-40 to 125

1.Our SO-8 package used for voltage regulators is modified internally to have pins 2, 3, 6 and 7 electrically communed to the die attach flag. This particular frame decreases the total thermal resistance of the package and increases its ability to dissipate power when an appropriate area of copper on the printed circuit board is available for heat-sinking. The external dimensions are the same as for the standard SO-8.

Table 3.	Thermal data
Symbol	Parameter	SO-8	TO-92	SOT-89	Unit
RthJC	Thermal resistance junction-case. (max)	20		15	°C/W
R	Thermal resistance junction-ambient. (max)	55 (1)	200	55 (1)	°C/W
thJA

1.Considering 6 cm² of copper Board heat-sink.

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Electrical characteristics	L78LxxAB - L78LxxAC - L78LxxC

4 Electrical characteristics

Refer to the test circuits, TJ = 0 to 125 °C, IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified.

Table 4.	Electrical characteristics of L78L33C (VI = 8.3 V)
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25 °C	3.036	3.3	3.564	V
VO	Output voltage	IO = 1 to 40 mA, VI = 5.3 to 20 V	2.97		3.63	V
		IO = 1 to 70 mA, VI = 8.3 V	2.97		3.63
VO	Line regulation	VI = 5.3 to 20 V, TJ = 25 °C			150	mV
		VI = 6.3 to 20 V, TJ = 25 °C			100
VO	Load regulation	IO = 1 to 100 mA, TJ = 25 °C			60	mV
		IO = 1 to 40 mA, TJ = 25 °C			30
Id	Quiescent current	TJ = 25 °C			6	mA
		TJ = 125 °C			5.5	mA
Id	Quiescent current change	IO = 1 to 40 mA			0.2	mA
		VI = 6.3 to 20 V			1.5
eN	Output noise voltage	B =10 Hz to 100 kHz, TJ = 25 °C		40		µV
SVR	Supply voltage rejection	VI = 6.3 to 16.3 V, f = 120 Hz	41	49		dB
		IO = 40 mA, TJ = 25 °C
Vd	Dropout voltage			1.7		V

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L78LxxAB - L78LxxAC - L78LxxC			Electrical characteristics
Table 5.	Electrical characteristics of L78L05C (VI = 10 V)
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25 °C	4.6	5	5.4	V
VO	Output voltage	IO = 1 to 40 mA, VI = 7 to 20 V	4.5		5.5	V
		IO = 1 to 70 mA, VI = 10 V	4.5		5.5
VO	Line regulation	VI = 8.5 to 20 V, TJ = 25 °C			200	mV
		VI = 9 to 20 V, TJ = 25 °C			150
VO	Load regulation	IO = 1 to 100 mA, TJ = 25 °C			60	mV
		IO = 1 to 40 mA, TJ = 25 °C			30
Id	Quiescent current	TJ = 25 °C			6	mA
		TJ = 125 °C			5.5	mA
Id	Quiescent current change	IO = 1 to 40 mA			0.2	mA
		VI = 8 to 20 V			1.5
eN	Output noise voltage	B =10 Hz to 100 kHz, TJ = 25 °C		40		µV
SVR	Supply voltage rejection	VI = 9 to 20 V, f = 120 Hz	40	49		dB
		IO = 40 mA, TJ = 25 °C
Vd	Dropout voltage			1.7		V
Table 6.	Electrical characteristics of L78L08C (VI = 14 V)
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25 °C	7.36	8	8.64	V
VO	Output voltage	IO = 1 to 40 mA, VI = 8.5 to 20 V	7.2		8.8	V
		IO = 1 to 70 mA, VI = 12 V	7.2		8.8
VO	Line regulation	VI = 8.5 to 20 V, TJ = 25 °C			200	mV
		VI = 9 to 20 V, TJ = 25 °C			150
VO	Load regulation	IO = 1 to 100 mA, TJ = 25 °C			80	mV
		IO = 1 to 40 mA, TJ = 25 °C			40
Id	Quiescent current	TJ = 25 °C			6	mA
		TJ = 125 °C			5.5	mA
Id	Quiescent current change	IO = 1 to 40 mA			0.2	mA
		VI = 8 to 20 V			1.5
eN	Output noise voltage	B =10 Hz to 100 kHz, TJ = 25 °C		60		µV
SVR	Supply voltage rejection	VI = 9 to 20 V, f = 120 Hz	36	45		dB
		IO = 40 mA, TJ = 25 °C
Vd	Dropout voltage			1.7		V

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Electrical characteristics			L78LxxAB - L78LxxAC - L78LxxC
Table 7.	Electrical characteristics of L78L09C (VI = 15 V)
Symbol	Parameter	Test conditions		Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25 °C		8.28	9	9.72	V
VO	Output voltage	IO = 1 to 40 mA, VI = 11.5 to 23 V		8.1		9.9	V
		IO = 1 to 70 mA, VI = 15 V		8.1		9.9
VO	Line regulation	VI = 11.5 to 23 V, TJ = 25 °C				250	mV
		VI = 12 to 23 V, TJ = 25 °C				200
VO	Load regulation	IO = 1 to 100 mA, TJ = 25 °C				80	mV
		IO = 1 to 40 mA, TJ = 25 °C				40
Id	Quiescent current	TJ = 25 °C				6	mA
		TJ = 125 °C				5.5	mA
Id	Quiescent current change	IO = 1 to 40 mA				0.2	mA
		VI = 12 to 23 V				1.5
eN	Output noise voltage	B =10 Hz to 100 kHz, TJ = 25 °C			70		µV
SVR	Supply voltage rejection	VI = 12 to 23 V, f = 120 Hz		36	44		dB
		IO = 40 mA, TJ = 25 °C
Vd	Dropout voltage				1.7		V
Table 8.	Electrical characteristics of L78L10C (VI = 16 V)
Symbol	Parameter	Test conditions		Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25 °C		9.2	10	10.8	V
VO	Output voltage	IO = 1 to 40 mA, VI = 12.5 to 23 V		9		11	V
		IO = 1 to 70 mA, VI = 16 V		9		11
VO	Line regulation	VI = 12.5 to 23 V, TJ = 25 °C				230	mV
		VI = 13 to 23 V, TJ = 25 °C				170
VO	Load regulation	IO = 1 to 100 mA, TJ = 25 °C				80	mV
		IO = 1 to 40 mA, TJ = 25 °C				40
Id	Quiescent current	TJ = 25 °C				6	mA
		TJ = 125 °C				5.5	mA
Id	Quiescent current change	IO = 1 to 40 mA				0.1	mA
		VI = 13 to 23 V				1.5
eN	Output noise voltage	B =10Hz to 100kHz, TJ = 25 °C			60		µV
SVR	Supply voltage rejection	VI = 14 to 23 V, f = 120Hz		37	45		dB
		IO = 40 mA, TJ = 25 °C
Vd	Dropout voltage				1.7		V

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L78LxxAB - L78LxxAC - L78LxxC			Electrical characteristics
Table 9.	Electrical characteristics of L78L12C (VI = 19 V)
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25 °C	11.1	12	12.9	V
VO	Output voltage	IO = 1 to 40 mA, VI = 14.5 to 27 V	10.8		13.2	V
		IO = 1 to 70 mA, VI = 19 V	10.8		13.2
VO	Line regulation	VI = 14.5 to 27 V, TJ = 25 °C			250	mV
		VI = 16 to 27 V, TJ = 25 °C			200
VO	Load regulation	IO = 1 to 100 mA, TJ = 25 °C			100	mV
		IO = 1 to 40 mA, TJ = 25 °C			50
Id	Quiescent current	TJ = 25 °C			6.5	mA
		TJ = 125 °C			6	mA
Id	Quiescent current change	IO = 1 to 40 mA			0.2	mA
		VI = 16 to 27 V			1.5
eN	Output noise voltage	B =10 Hz to 100 kHz, TJ = 25 °C		80		µV
SVR	Supply voltage rejection	VI = 15 to 25 V, f = 120 Hz	36	42		dB
		IO = 40 mA, TJ = 25 °C
Vd	Dropout voltage			1.7		V

Table 10. Electrical characteristics of L78L15C (VI = 23 V)

Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25 °C	13.8	15	16.2	V
VO	Output voltage	IO = 1 to 40 mA, VI = 17.5 to 30 V	13.5		16.5	V
		IO = 1 to 70 mA, VI = 23 V	13.5		16.5
VO	Line regulation	VI = 17.5 to 30 V, TJ = 25 °C			300	mV
		VI = 20 to 30 V, TJ = 25 °C			250
VO	Load regulation	IO = 1 to 100 mA, TJ = 25 °C			150	mV
		IO = 1 to 40 mA, TJ = 25 °C			75
Id	Quiescent current	TJ = 25 °C			6.5	mA
		TJ = 125 °C			6	mA
Id	Quiescent current change	IO = 1 to 40 mA			0.2	mA
		VI = 20 to 30 V			1.5
eN	Output noise voltage	B =10 Hz to 100 kHz, TJ = 25 °C		90		µV
SVR	Supply voltage rejection	VI = 18.5 to 28.5 V, f = 120 Hz	33	39		dB
		IO = 40 mA, TJ = 25 °C
Vd	Dropout voltage			1.7		V

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