SGS Thomson Microelectronics L4949EP, L4949E, L4949, L4949ED Datasheet

	L4949E
	MULTIFUNCTION VERY LOW DROP
	VOLTAGE REGULATOR

OPERATING DC SUPPLY VOLTAGE RANGE 5V - 28V

TRANSIENT SUPPLY VOLTAGE UP TO 40V EXTREMELY LOW QUIESCENT CURRENT IN STANDBY MODE

HIGH PRECISION STANDBY OUTPUT VOLTAGE 5V±1%

OUTPUT CURRENT CAPABILITY UP TO 100mA

VERY LOW DROPOUT VOLTAGE LESS THAN 0.5V

RESET CIRCUIT SENSING THE OUTPUT VOLTAGE

PROGRAMMABLE RESET PULSE DELAY WITH EXTERNAL CAPACITOR

VOLTAGE SENSE COMPARATOR THERMAL SHUTDOWN AND SHORT CIRCUIT PROTECTIONS

BLOCK DIAGRAM

Minidip

SO8

SO20W (12+4+4)

ORDERING NUMBERS: L4949E (Minidip) L4949ED (SO8) L4949EP (SO20W)

DESCRIPTION

The L4949E is a monolithic integrated 5V voltage regulator with a very low dropout output and additional functions as power-on reset and input voltage sense. It is designed for supplying the microcomputer controlled systems especially in automotive applications.

VZ

VOUT

CT

VS	PREREGULATOR 5V

	2μ	RES
	+
		2V
REG	RESET
	VS
SI		SO
1.23V		1.23V
REF	SENSE	GND
		D96AT219

June 2000

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L4949E

ABSOLUTE MAXIMUM RATINGS

Symbol	Parameter
VSDC	DC Operating Supply Voltage
VSTR	Transient Supply Voltage (T < 1s)
IO	Output Current
VO	Output Voltage
VRES, VSO	Output Voltage
IRES, ISO	Output Current
VZ	Preregulator Output Voltage
IZ	Preregulator Output Current
TJ	Junction Temperature
Tstg	Storage Temperature Range

Note: The circuit is ESD protected according to MIL-STD-883C

THERMAL DATA

Symbol	Description
Rth j-amb	Thermal Resistance Junction-ambient
Rth j-pins	Thermal Resistance Junction-pins
TJSD	Thermal Shutdown Junction temperature

PIN CONNECTIONS

VS	1	8	VOUT
SI	2	7	SO
VZ	3	6	RES
CT	4	5	GND
		D95AT217

MINIDIP/SO8

Value	Unit
28	V
40	V
Internally Limited
20	V
20	V
5	mA
7	V
5	mA
-40 to +150	°C
-55 to +150	°C

	Minidip	SO-8	SO20L	Unit
Max	100	200	50	°C/W
Max			15	°C/W
		165		°C

VZ	1	20	SI
CT	2	19	VS
N.C.	3	18	N.C.
GND	4	17	GND
GND	5	16	GND
GND	6	15	GND
GND	7	14	GND
N.C.	8	13	N.C.
N.C.	9	12	VOUT
RES	10	11	SO
		D95AT218

SO20

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L4949E

ELECTRICAL CHARACTERISTICS (VS = 14V; -40°C < Tj < 125°C unless otherwise specified)

Symbol	Parameter	Test Condition	Min.	Typ.	Max.	Unit
VO	Output Voltage	TJ = 25°C; IO = 1mA	4.95	5	5.05	V
VO	Output Voltage	6V < VIN < 28V, 1mA < IO < 50mA	4.90	5	5.10	V
VO	Output Voltage	VIN = 40V;	4.75		5.25	V
		T < 1s 5mA < IO <100mA
VDP	Dropout Voltage	IO = 10mA		0.1	0.25	V
		IO = 50mA		0.2	0.4	V
		IO = 100mA		0.3	0.5	V
VIO	Input to Output Voltage	VIN = 4V, IO = 35mA			0.4	V
	Difference in Undervoltage
	Condition
Iouth **	Max Output Leakage	VIN = 25V, VO = 5.5V	20	50	80	μA
VOL	Line Regulation	6V < VIN < 28V; IO = 1mA			20	mV
VOLO	Load Regulation	1mA < IO < 100mA			30	mV
ILIM	Current Limit	VO = 4.5V	105	200	400	mA
		VO = 4.5V, TJ = 25°C	120		400	mA
		VO = 0V (note 1)		100		mA
IQSE	Quiescent Current	IO = 0.3mA; TJ < 100°C		200	300	μA
IQ	Quiescent Current	IO = 100mA			5	mA
** With this test we guarantee that with no output current the output voltage will not exceed 5.5V
RESET
VRT	Reset Thereshold Voltage			VO -0.5V		V
VRTH	Reset Thereshold Hysteresis		50	100	200	mV
tRD	Reset Pulse Delay	CT = 100nF; TR ≥ 100μs	55	100	180	ms
VRL	Reset Output Low Voltage	RRES = 10KΩ to VO VS ≥ 1.5V			0.4	V
IRH	Reset Output High Leakage Current	VRES = 5V			1	μA
VCTth	Delay Comparator Thereshold			2		V
VCTth, hy	Delay Comparator Thereshold			100		mV
	Hysteresis
SENSE
Vst	Sense Low Thereshold		1.16	1.23	1.35	V
Vsth	Sense Thereshold Hysteresis		20	100	200	mV
VSL	Sense Output Low Voltage	VSI ≤ 1.16V; VS ≥ 3V			0.4	V
		RSO = 10KΩ to VO
ISH	Sense Output Leakage	VSO = 5V; VSI ≥ 1.5V			1	μA
ISI	Sense Input Current	VSI = 0	-20	-8	-3	μA
PREREGULATOR
VZ	Preregulator Output Voltage	IZ = 10μA	4.5	5	6	V
IZ	Preregulator Output Current				10	μA

Note 1: Foldback characteristic

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