ST L78M05AB, L78M12AB, L78M05AC, L78M12AC, L78M06AB User Manual

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		TO-220	DPAK
	■ Guaranteed in extended temperature range

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		L78M12AB
	L78M05AC		L78M12AC
	L78M06AB		L78M15AB
	L78M08AB		L78M24AB
	L78M09AB		L78M24AC
	L78M10AB

May 2012

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This is information on a product in full production.

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Contents	L78MxxAB, L78MxxAC

Contents

1	Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 3
2	Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. 4
3	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
4	Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
5	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
6	Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
7	Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
	7.1 Design considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
8	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	19
9	Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	29
10	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	30

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L78MxxAB, L78MxxAC	Diagram

1 Diagram

Figure 1. Block diagram

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Pin configuration	L78MxxAB, L78MxxAC

2 Pin configuration

Figure 2. Pin connections (top view)

			TO-220				DPAK

Figure 3. Schematic diagram

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L78MxxAB, L78MxxAC							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, 24 V			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 L78M00AC				0 to 125		°C
			for L78M00AB				-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			DPAK	Unit
RthJC		Thermal resistance junction-case		5			8	°C/W
RthJA		Thermal resistance junction-ambient		50			100	°C/W

Figure 4. Application circuit

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Test circuits	L78MxxAB, L78MxxAC

4 Test circuits

Figure 5. DC parameter

Figure 6. Load regulation

Figure 7. Ripple rejection

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L78MxxAB, L78MxxAC	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.	Electrical characteristics of L78M05XX
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25°C	4.9	5	5.1	V
VO	Output voltage	IO = 5 to 350 mA, VI = 7 to 20 V	4.8	5	5.2	V
VO	Line regulation	VI = 7 to 25 V, IO = 200 mA, TJ = 25°C			100	mV
		VI = 8 to 25 V, IO = 200 mA, TJ = 25°C			50
VO	Load regulation	IO = 5 to 500 mA, TJ = 25°C			100	mV
		IO = 5 to 200 mA, TJ = 25°C			50
Id	Quiescent current	TJ = 25°C			6	mA
Id	Quiescent current change	IO = 5 to 350 mA			0.5	mA
		IO = 200 mA, VI = 8 to 25 V			0.8
VO/ T	Output voltage drift	IO = 5 mA		-0.5		mV/°C
SVR	Supply voltage rejection	VI = 8 to 18 V, f = 120Hz, IO = 300mA,	62			dB
		TJ = 25°C
eN	Output noise voltage	B =10Hz to 100kHz, TJ = 25°C		40		µV
Vd	Dropout voltage	TJ = 25°C		2		V
Isc	Short circuit current	TJ = 25°C, VI = 35 V		300		mA
Iscp	Short circuit peak current	TJ = 25°C		700		mA

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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 specified.

Table 5.	Electrical characteristics of L78M06XX
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25°C	5.88	6	6.12	V
VO	Output voltage	IO = 5 to 350 mA, VI = 8 to 21 V	5.75	6	6.3	V
VO	Line regulation	VI = 8 to 25 V, IO = 200 mA, TJ = 25°C			100	mV
		VI = 9 to 25 V, IO = 200 mA, TJ = 25°C			30
VO	Load regulation	IO = 5 to 500 mA, TJ = 25°C			120	mV
		IO = 5 to 200 mA, TJ = 25°C			60
Id	Quiescent current	TJ = 25°C			6	mA
Id	Quiescent current change	IO = 5 to 350 mA			0.5	mA
		IO = 200 mA, VI = 9 to 25 V			0.8
VO/ T	Output voltage drift	IO = 5 mA		-0.5		mV/°C
SVR	Supply voltage rejection	VI = 9 to 19 V, f = 120Hz, IO = 300mA,	59			dB
		TJ = 25°C
eN	Output noise voltage	B =10Hz to 100kHz		45		µV
Vd	Dropout voltage	TJ = 25°C		2		V
Isc	Short circuit current	TJ = 25°C, VI = 35 V		270		mA
Iscp	Short circuit peak current	TJ = 25°C		700		mA

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L78MxxAB, L78MxxAC	Electrical characteristics

Refer to the test circuits, VI = 14 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 6.	Electrical characteristics of L78M08XX
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25°C	7.84	8	8.16	V
VO	Output voltage	IO = 5 to 350 mA, VI = 10.5 to 23 V	7.7	8	8.3	V
		VI = 10.5 to 25 V, IO = 200 mA,			100
VO	Line regulation	TJ = 25°C				mV
		VI = 11 to 25 V, IO = 200 mA, TJ = 25°C			30
VO	Load regulation	IO = 5 to 500 mA, TJ = 25°C			160	mV
		IO = 5 to 200 mA, TJ = 25°C			80
Id	Quiescent current	TJ = 25°C			6	mA
Id	Quiescent current change	IO = 5 to 350 mA			0.5	mA
		IO = 200 mA, VI = 10.5 to 25 V			0.8
VO/ T	Output voltage drift	IO = 5 mA		-0.5		mV/°C
SVR	Supply voltage rejection	VI = 11.5 to 21.5 V, f = 120Hz	56			dB
		IO = 300mA, TJ = 25°C
eN	Output noise voltage	B =10Hz to 100kHz, TJ = 25°C		52		µV
Vd	Dropout voltage	TJ = 25°C		2		V
Isc	Short circuit current	TJ = 25°C, VI = 35 V		250		mA
Iscp	Short circuit peak current	TJ = 25°C		700		mA

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Electrical characteristics	L78MxxAB, L78MxxAC

Refer to the test circuits, VI = 15 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 7.	Electrical characteristics of L78M09XX
Symbol	Parameter	Test conditions	Min.	Typ.	Max.	Unit
VO	Output voltage	TJ = 25°C	8.82	9	9.18	V
VO	Output voltage	IO = 5 to 350 mA, VI = 11.5 to 24 V	8.64	9	9.36	V
		VI = 11.5 to 25 V, IO = 200 mA,			100
VO	Line regulation	TJ = 25°C				mV
		VI = 12 to 25 V, IO = 200 mA, TJ = 25°C			30
VO	Load regulation	IO = 5 to 500 mA, TJ = 25°C			180	mV
		IO = 5 to 200 mA, TJ = 25°C			90
Id	Quiescent current	TJ = 25°C			6	mA
Id	Quiescent current change	IO = 5 to 350 mA			0.5	mA
		IO = 200 mA, VI = 11.5 to 25 V			0.8
VO/ T	Output voltage drift	IO = 5 mA		-0.5		mV/°C
SVR	Supply voltage rejection	VI = 12.5 to 23 V, f = 120Hz,	56			dB
		IO = 300mA, TJ = 25°C
eN	Output noise voltage	B =10Hz to 100kHz, TJ = 25°C		52		µV
Vd	Dropout voltage	TJ = 25°C		2		V
Isc	Short circuit current	VI = 35 V, TJ = 25°C		250		mA
Iscp	Short circuit peak current	TJ = 25°C		700		mA

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