ST L4987 User Manual

L4987CXX120

L4987

SERIES

VERY LOW DROP VOLTAGE REGULATORS

WITH INHIBIT AND DROPOUT CONTROL FLAG

■VERY LOW DROPOUT VOLTAGE (0.25V TYP.)

■DROPOUT CONTROL FLAG

■VERY LOW QUIESCENT CURRENT

■(TYP. 90 mA IN OFF MODE, 500mA IN ON MODE)

■OUTPUT CURRENT UP TO 200 mA

■LOGIC-CONTROLLED ELECTRONIC SHUTDOWN

■OUTPUT VOLTAGES OF 3V, 3.3V, 5V, 8.7V, 12V

■INTERNAL CURRENT AND THERMAL LIMIT

■ONLY 2.2µF FOR STABILITY

■AVAILABLE IN ± 2% SELECTION AT 25°C

■SUPPLY VOLTAGE REJECTION: 70dB (TYP.)

DESCRIPTION

The L4987 is a very low drop regulator available in PPAK. The very low drop-voltage (0.5V Max at 200 mA) and the very low quiescent current make it particularly suitable for low noise, low power applications, and in battery powered systems. The input dump protection up to 40V makes it ideal for automotive applications. a shutdown Logic Control function is available (pin2, TTL compatible). This means that when the device is used as a local regulator, it is possible to put a part

SCHEMATIC DIAGRAM

PPAK

of the board in standby, decreasing the total power consumption. The regulator employs an output pin (open collector) providing a logic signal when the pass transistor is in saturation at low input voltage, this signal can be used to prevent the pop-up phenomenon in the car radio. In battery powered systems (the cellular phone, notebook) it is possible to use the flag to monitor the battery charge status through the dropout of the regulator.

June 2003

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L4987 SERIES

ABSOLUTE MAXIMUM RATINGS

Symbol	Parameter²	Value	Unit
VI	DC Input Voltage	40	V
IO	Output Current	Internally Limited
Ptot	Power Dissipation	Internally Limited
Tstg	Storage Temperature Range	-40 to 150	°C
Top	Operating Junction Temperature Range	-40 to 125	°C

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

THERMAL DATA

Symbol	Parameter	PPAK	Unit
Rthj-case	Thermal Resistance Junction-case	8	°C/W
Rthj-amb	Thermal Resistance Junction-ambient	100	°C/W

CONNECTION DIAGRAM (top view)

ORDERING CODES

TYPE	OUTPUT VOLTAGE
L4987CPT30 (*)	3.0 V
L4987CPT33 (*)	3.3 V
L4987CPT50 (*)	5.0 V
L4987CPT87 (*)	8.7 V
L4987CPT120 (*)	12 V

(*) Available even in tape & reel.

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L4987 SERIES

ELECTRICAL CHARACTERISTICS OF L4987CPT30 (refer to the test circuits, VI = 6V, IO = 5mA, TJ = 25°C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified)

Symbol	Parameter	Test Conditions				Min.	Typ.	Max.	Unit
VO	Output Voltage	IO = 200 mA VI = 6 V				2.94	3	3.06	V
		IO = 200 mA VI = 6V			TJ=-40 to 125°C	2.88		3.12
VI	Operating Input Voltage	IO = 200 mA				3.62		18	V
Iout	Output Current Limit					250			A
VO	Line Regulation	VI = 4.3 to 18 V	IO = 0.5 mA				2.4	14	mV
VO	Load Regulation	VI = 4.1 V	IO = 0.5 to 200 mA				3	20	mV
Id	Quiescent Current	VI = 4.3 to 18 V	IO = 0 mA				0.7	1	mA
	ON MODE
		VI = 4.3 to 18 V	IO = 200 mA				1.5	6
	OFF MODE	VI = 12 V					90	180	µA
SVR	Supply Voltage Rejection	IO = 5 mA		f = 120 Hz			80		dB
		VI = 5.3 ± 1 V		f = 1 KHz			75
				f = 10 KHz			60
Vd	Dropout Voltage	IO = 200 mA					0.25	0.5	V
		IO = 200 mA	TJ=-40 to 125°C					0.7
VIL	Control Input Logic Low	TJ= -40 to 125°C						0.8	V
VIH	Control Input Logic High	TJ= -40 to 125°C				2			V
II	Control Input Current						10		µA
CO	Output Bypass Capacitance	ESR = 0.5 to 10 Ω		IO = 0 to 200 mA		2	10		µF
		TJ= -40 to 125°C
VFL	Control Flag Output Low	VI - VO < VCESAT power,			IFL = 6mA			0.5	V
		IO = 200mA
IFH	Control Flag Output High	VI > 3.62 V,	VOH = 15 V					10	µA
	Leakage Current

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L4987 SERIES

ELECTRICAL CHARACTERISTICS OF L4987CPT33 (refer to the test circuits, VI = 6.3V, IO = 5mA, TJ = 25°C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified)

Symbol	Parameter	Test Conditions				Min.	Typ.	Max.	Unit
VO	Output Voltage	IO = 200 mA VI = 6.3 V				2.88	3.3	3.066	V
		IO = 200 mA VI = 6.3 V			TJ=-40 to 125°C	2.76		3.432
VI	Operating Input Voltage	IO = 200 mA				4		18	V
Iout	Output Current Limit					250			A
VO	Line Regulation	VI = 4.6 to 18 V	IO = 0.5 mA				2.4	14	mV
VO	Load Regulation	VI = 4.4 V	IO = 0.5 to 200 mA				3	20	mV
Id	Quiescent Current	VI = 4.6 to 18 V	IO = 0 mA				0.7	1	mA
	ON MODE
		VI = 4.6 to 18 V	IO = 200 mA				1.5	6
	OFF MODE	VI = 12 V					90	180	µA
SVR	Supply Voltage Rejection	IO = 5 mA		f = 120 Hz			80		dB
		VI = 5.6 ± 1 V		f = 1 KHz			75
				f = 10 KHz			60
Vd	Dropout Voltage	IO = 200 mA					0.25	0.5	V
		IO = 200 mA	TJ=-40 to 125°C					0.7
VIL	Control Input Logic Low	TJ= -40 to 125°C						0.8	V
VIH	Control Input Logic High	TJ= -40 to 125°C				2			V
II	Control Input Current						10		µA
CO	Output Bypass Capacitance	ESR = 0.5 to 10 Ω		IO = 0 to 200 mA		2	10		µF
		TJ= -40 to 125°C
VFL	Control Flag Output Low	VI - VO < VCESAT power,			IFL = 6mA			0.5	V
		IO = 200mA
IFH	Control Flag Output High	VI > 4 V,	VOH = 15 V					10	µA
	Leakage Current

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