ST L79L05AC, L79L09AC, L79L05AB, L79L09AB, L79L06C User Manual

L79L09ABD13TR

L79LxxAB

L79LxxAC - L79LxxC

Negative voltage regulators

Features

■Output current up to 100 mA

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

■Thermal overload protection

■Short circuit protection

■No external components are required

■Available in either ±5% (AC) or ±10% (C) selection

Description

The L79Lxx series of three-terminal negative 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

TO-92

SO-8

SOT-89

power pass elements to make high-current voltage regulators.

The L79Lxx series used as Zener diode/resistor combination replacement, offers an effective output impedance improvement of typically two orders of magnitude, along with lower quiescent current and lower noise.

Table 1.	Device summary
		Part number
	L79L05AC			L79L09AC
	L79L05AB			L79L09AB
	L79L06C			L79L12C
	L79L06AC			L79L12AC
	L79L06AB			L79L12AB
	L79L08C			L79L15C
	L79L08AC			L79L15AC
	L79L08AB			L79L15AB
	L79L09C
December 2007		Rev 14		1/22

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L79LxxAB - L79LxxAC - L79LxxC

Contents

1	Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 3
2	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 4
3	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
4	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
5	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
6	Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	20
7	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	21

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L79LxxAB - L79LxxAC - L79LxxC	Diagram

1 Diagram

Figure 1. Schematic diagram

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Pin configuration	L79LxxAB - L79LxxAC - L79LxxC

2 Pin configuration

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

PIN 1 = GND

PIN 2 = VIN

PIN 3 = VOUT

SO-8

SOT-89

TO-92

Figure 3. Test circuit

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L79LxxAB - L79LxxAC - L79LxxC	Maximum ratings

	3	Maximum ratings
	Table 2.	Absolute maximum ratings
	Symbol	Parameter		Value	Unit
	VI	DC input voltage	VO = -5 to -9 V	-30	V
			VO = -12 to -15 V	-35
	IO	Output current		100	mA
	PD	Power dissipation		Internally Limited (1)	mW
	TSTG	Storage temperature range		-40 to 150	°C
	TOP	Operating junction temperature range	For L79L00C, L79L00AC	0 to 125	°C
			For L79L00AB	-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		°C/W
thJA

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

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Electrical characteristics			L79LxxAB - L79LxxAC - L79LxxC
4	Electrical characteristics
Table 4.	Electrical characteristics of L79L05 (refer to the test circuits, TJ = 0 to 125 °C, VI = -10 V,
	IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
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 = -7 to -20 V, TJ = 25°C				200	mV
		VI = -8 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 =10Hz to 100kHz, TJ = 25°C			40		µV
SVR	Supply voltage rejection	VI = -8 to -18V, f = 120Hz		40	49		dB
		IO = 40 mA, TJ = 25°C
Vd	Dropout voltage				1.7		V

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L79LxxAB - L79LxxAC - L79LxxC			Electrical characteristics
Table 5.	Electrical characteristics of L79L06 (refer to the test circuits, TJ = 0 to 125 °C, VI = -12 V,
	IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25°C	-5.52	-6	-6.48	V
VO	Output voltage	IO = 1 to 40 mA, VI = -8.5 to -20 V	-5.4		-6.6	V
		IO = 1 to 70 mA, VI = -12 V	-5.4		-6.6
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 =10Hz to 100kHz, TJ = 25°C		50		µV
SVR	Supply voltage rejection	VI = -9 to -20V, f = 120Hz	38	46		dB
		IO = 40 mA, TJ = 25°C
Vd	Dropout voltage			1.7		V
Table 6.	Electrical characteristics of L79L08 (refer to the test circuits, TJ = 0 to 125 °C, VI = -14 V,
	IO = 40 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified)
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 = -10.5 to -23 V	-7.2		-8.8	V
		IO = 1 to 70 mA, VI = -14 V	-7.2		-8.8
VO	Line regulation	VI = -10.5 to -23 V, TJ = 25°C			200	mV
		VI = -11 to -23 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 = -11 to -23 V			1.5
eN	Output noise voltage	B =10Hz to 100kHz, TJ = 25°C		60		µV
SVR	Supply voltage rejection	VI = -12 to -23V, f = 120Hz	36	45		dB
		IO = 40 mA, TJ = 25°C
Vd	Dropout voltage			1.7		V

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