ST L7805AB, L7809AC, L7805AC, L7812AB, L7806AB User Manual

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L78xxAB

L78xxAC

Precision 1 A regulators

Features

■Output current in excess of 1 A

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

■Thermal overload protection

■Output transition SOA protection

■2 % Output voltage tolerance

■Guaranteed in extended temperature range

Description

The L78xxAB L78xxAC series of three terminal positive regulators are 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 on-card regulation, eliminating the distribution problem 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 1 A output current, although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltage and currents.

TO-220	TO-220FP
	D2PAK

Table 1.	Device summary
	Order codes
	L7805AB		L7809AC
	L7805AC		L7812AB
	L7806AB		L7812AC
	L7806AC		L7815AB
	L7808AB		L7815AC
	L7808AC		L7824AB
	L7809AB		L7824AC
July 2008	Rev 17		1/26

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Contents	L78xxAB - L78xxAC

Contents

1	Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 3
2	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 4
3	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
4	Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
5	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
6	Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
	6.1 Design consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	14
7	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
8	Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	24
9	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	25

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L78xxAB - L78xxAC	Diagram

1 Diagram

Figure 1. Block diagram

Figure 2. Schematic diagram

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Pin configuration	L78xxAB - L78xxAC

2 Pin configuration

Figure 3. Pin connections (top view)

TO-220	TO-220FP
	D2PAK

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L78xxAB - L78xxAC							Maximum ratings
3	Maximum ratings
Table 2.	Absolute maximum ratings
Symbol	Parameter						Value		Unit
VI	DC input voltage	for VO= 5 to 18V				35			V
		for VO= 20, 24V				40
IO	Output current				Internally limited				mA
PD	Power dissipation				Internally limited				mW
TSTG	Storage temperature range					-65 to 150			°C
TOP	Operating junction temperature range	for L7800AC				0 to 150			°C
		for L7800AB				-40 to 125
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		TO-220	TO-220FP			D2PAK		Unit
RthJC	Thermal resistance junction-case		3	5			3		°C/W
RthJA	Thermal resistance junction-ambient		50	60			62.5		°C/W

Figure 4. Application circuit

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Test circuits	L78xxAB - L78xxAC

4 Test circuits

Figure 5. DC parameter

Figure 6. Load regulation

Figure 7. Ripple rejection

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L78xxAB - L78xxAC	Electrical characteristics

	5	Electrical characteristics
	Table 4.	Electrical characteristics of L7805A (VI = 10 V, IO = 1 A, TJ = 0 to 150 °C (L7805AC),
		TJ = -40 to 125 °C (L7805AB), 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 = 5mA to 1A, PO ≤15W	4.8	5	5.2	V
			VI = 7.5 to 20V
			VI = 7.5 to 25V, IO = 500 mA		7	50	mV
	V (1)	Line regulation	VI = 8 to 12V		10	50	mV
	O		VI = 8 to 12V, TJ = 25°C		2	25	mV
			VI = 7.3 to 20V, TJ = 25°C		7	50	mV
			IO = 5mA to 1A		25	100	mV
	VO(*)	Load regulation	IO = 5mA to 1.5A, TJ = 25°C		30	100	V
			IO = 250 to 750mA		8	50	V
	Iq	Quiescent current	TJ = 25°C		4.3	6	mA
						6	mA
			VI = 8 to 25V, IO = 500 mA			0.8	mA
	Iq	Quiescent current change	VI = 7.5 to 20V, TJ = 25°C			0.8	mA
			IO = 5mA to 1A			0.5	mA
	SVR	Supply voltage rejection	VI = 8 to 18V, f = 120Hz, IO = 500mA		68		dB
	Vd	Dropout voltage	IO = 1A, TJ = 25°C		2		V
	eN	Output noise voltage	TA = 25°C, B =10Hz to 100kHz		10		µV/VO
	RO	Output resistance	f =1kHz		17		mΩ
	Isc	Short circuit current	VI = 35V, TA = 25°C		0.2		A
	Iscp	Short circuit peak current	TJ = 25°C		2.2		A
	VO/ T	Output voltage drift			-1.1		mV/°C

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									L78xxAB - L78xxAC
Table 5.		Electrical characteristics of L7806A (VI = 11 V, IO = 1 A, TJ = 0 to 150 °C (L7806AC),
		TJ = -40 to 125 °C (L7806AB), unless otherwise specified)
Symbol		Parameter			Test conditions			Min.	Typ.	Max.	Unit
VO		Output voltage	TJ = 25°C					5.88	6	6.12	V
VO		Output voltage	IO = 5mA to 1A, PO ≤15W					5.76	6	6.24	V
			VI		= 8.6 to 21V
			VI		= 8.6 to 25V, IO = 500 mA				9	60	mV
V	(1)	Line regulation	VI		= 9 to 13V				11	60	mV
O			VI = 9 to 13V, TJ = 25°C						3	30	mV
			VI = 8.3 to 21V, TJ = 25°C						9	60	mV
			IO = 5mA to 1A						25	100	mV
V	(1)	Load regulation	I	O	= 5mA to 1.5A, T	J	= 25°C		30	100	V
O
			IO = 250 to 750mA						10	50	V
Iq		Quiescent current	TJ = 25°C						4.3	6	mA
										6	mA
			VI = 9 to 25V, IO = 500 mA							0.8	mA
Iq		Quiescent current change	VI = 8.6 to 21V, TJ = 25°C							0.8	mA
			IO = 5mA to 1A							0.5	mA
SVR		Supply voltage rejection	VI = 9 to 19V, f = 120Hz, IO = 500mA						65		dB
Vd		Dropout voltage	IO = 1A, TJ = 25°C						2		V
eN		Output noise voltage	TA = 25°C, B =10Hz to 100kHz						10		µV/VO
RO		Output resistance	f =1kHz						17		mΩ
Isc		Short circuit current	VI = 35V, TA = 25°C						0.2		A
Iscp		Short circuit peak current	TJ = 25°C						2.2		A
VO/	T	Output voltage drift							-0.8		mV/°C

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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