ST L7905C, L7905CV, L7905CV-DG, L7905CD2T-TR, L7905CP User Manual

L79xxC

Negative voltage regulators

Datasheet − production data

Features

■ Output current up to 1.5 A

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

■ Thermal overload protection

■ Short circuit protection

	■ Output transition SOA protection
	TO-220	TO-220FP
	Description
	The L79xxC series of three-terminal negative
	regulators is available in TO-220, TO-220FP and
	D²PAK packages and several fixed output
	voltages, making it useful in a wide range of
	applications. These regulators can provide local	D²PAK
	on-card regulation, eliminating the distribution
	problems associated with single point regulation;
	furthermore, having the same voltage option as
	the L78xx positive standard series, they are
	particularly suited for split power supplies. If
	adequate heat sinking is provided, they can
	deliver over 1.5 A output current. Although
	designed primarily as fixed voltage regulators,
	these devices can be used with external
	components to obtain adjustable voltages and
	currents.

Table 1.	Device summary
Part numbers				Order codes			Output
			TO-220		D²PAK	TO-220FP	voltages
L7905C		L7905CV		L7905CV-DG (1)	L7905CD2T-TR	L7905CP	- 5 V
L7908C		L7908CV		L7908CV-DG (1)			- 8 V
L7912C		L7912CV		L7912CV-DG (1)	L7912CD2T-TR	L7912CP	- 12 V
L7915C		L7915CV		L7915CV-DG (1)	L7915CD2T-TR	L7915CP	- 15 V

1. TO-220 Dual Gauge frame.

May 2012

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This is information on a product in full production.

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Contents	L79xxC

Contents

1	Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 3
2	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 4
3	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
4	Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
5	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
6	Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
7	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
8	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	23

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L79xxC	Diagram

1 Diagram

Figure 1. Schematic diagram

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Pin configuration	L79xxC

2 Pin configuration

Figure 2. Pin connections (top view)

TO-220	TO220FP
	D²PAK (any type)

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L79xxC								Maximum ratings
3	Maximum ratings
Table 2.	Absolute maximum ratings
Symbol	Parameter							Value		Unit
VI	DC input voltage	for VO = - 5 to - 18 V					-35			V
		for VO = - 20 to - 24 V					-40
IO	Output current						Internally limited
PD	Power dissipation						Internally limited
TSTG	Storage temperature range							-65 to 150		°C
TOP	Operating junction temperature range							0 to 150		°C
Note:	Absolute maximum ratings are those values beyond which damage to the device may occur.
	Functional operation under these condition is not implied.
Table 3.	Thermal data
Symbol	Parameter		D²PAK		TO-220			TO-220FP		Unit
RthJC	Thermal resistance junction-case		3		5			5		°C/W
RthJA	Thermal resistance junction-ambient		62.5		50			60		°C/W

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Test circuit	L79xxC

4 Test circuit

Figure 3. Test circuit

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L79xxC	Electrical characteristics

5 Electrical characteristics

Refer to the test circuits, TJ = 0 to 125 °C, VI = -10 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified.

	Table 4.		Electrical characteristics of L7905C
	Symbol		Parameter	Test conditions	Min.	Typ.	Max.	Unit
	VO		Output voltage	TJ = 25°C	-4.8	-5	-5.2	V
	VO		Output voltage	IO = -5 mA to -1 A, PO ≤ 15 W	-4.75	-5	-5.25	V
				VI = -8 to -20 V
	V	(1)	Line regulation	VI = -7 to -25 V, TJ = 25°C			100	mV
	O			VI = -8 to -12 V, TJ = 25°C			50
	V	(1)	Load regulation	IO = 5 mA to 1.5 A, TJ = 25°C			100	mV
	O			IO = 250 to 750 mA, TJ = 25°C			50
	Id		Quiescent current	TJ = 25°C			3	mA
	Id		Quiescent current change	IO = 5 mA to 1 A			0.5	mA
				VI = -8 to -25 V			1.3
	VO/ T		Output voltage drift	IO = 5 mA		-0.4		mV/°C
	eN		Output noise voltage	B = 10Hz to 100kHz, TJ = 25°C		100		µV
	SVR		Supply voltage rejection	VI = 10 V, f = 120Hz	54	60		dB
	Vd		Dropout voltage	IO = 1 A, TJ = 25°C, VO = 100 mV		1.4		V
	Isc		Short circuit current			2.1		A

1.Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.

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Electrical characteristics	L79xxC

Refer to the test circuits, TJ = 0 to 125 °C, VI = -14 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified.

	Table 5.		Electrical characteristics of L7908C
	Symbol		Parameter	Test conditions	Min.	Typ.	Max.	Unit
	VO		Output voltage	TJ = 25°C	-7.7	-8	-8.3	V
	VO		Output voltage	IO = -5 mA to -1 A, PO ≤ 15 W	-7.6	-8	-8.4	V
				VI = -11.5 to -23 V
	V	(1)	Line regulation	VI = -10.5 to -25 V, TJ = 25°C			160	mV
	O			VI = -11 to -17 V, TJ = 25°C			80
	V	(1)	Load regulation	IO = 5 mA to 1.5 A, TJ = 25°C			160	mV
	O			IO = 250 to 750 mA, TJ = 25°C			80
	Id		Quiescent current	TJ = 25°C			3	mA
	Id		Quiescent current change	IO = 5 mA to 1 A			0.5	mA
				VI = -11.5 to -25 V			1
	VO/ T		Output voltage drift	IO = 5 mA		-0.6		mV/°C
	eN		Output noise voltage	B = 10Hz to 100kHz, TJ = 25°C		175		µV
	SVR		Supply voltage rejection	VI = 10 V, f = 120Hz	54	60		dB
	Vd		Dropout voltage	IO = 1 A, TJ = 25°C, VO = 100 mV		1.1		V
	Isc		Short circuit current			1.5		A

1.Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.

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