SGS Thomson Microelectronics L4892CX, L4812CX, L4808CX, L4808CV, L4805CX Datasheet

L4805-L4885-L4892

L4808-L4810-L4812

VERY LOW DROP VOLTAGE REGULATORS

.

.INPUT/OUTPUT DROP TYP. 0.4V

.400mA OUTPUT CURRENT

.LOW QUIESCENT CURRENT

.REVERSE POLARITY PROTECTION

.OVERVOLTAGE PROTECTION (± 60V)

.FOLDBACK CURRENT LIMITING THERMAL SHUTDOWN

DESCRIPTION

L4800 series devices are voltage regulators with a very low voltage drop (typically 0.4V at full rated current), output current up to 400mA, low quiescent current and comprehensiveon-chip protection.These devices are protected against load dump and field decay transients of ± 60V, polarity reversal and overheating. A foldback current limiter protects against load short circuits. Available in 5V, 8.5V, 9.2V,10V and12V versions (all± 4%, TI = 25°C) these regulators are designed for automotive, industrial and consumer applications where low consumption is particularly important.

SO T-82

TO-220

In automotive applications the L4805 is ideal for 5V logic supplies becauseit can operateeven when the batteryvoltage falls below 6V. In batterybackup and standby applications the low consumption of these devices extends battery life.

BLOCK DIAGRAM

March 1992

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L4805-L4808-L4885-L4892-L4810-L4812

ABSOLUTE MAXIMUM RATINGS

Symbol	Parameter
VI	DC Input Voltage
	DC Input Reverse Voltage
	Transient Input Overvoltages :
	Load Dump :
	5ms < Trise < 10ms,
	τf Fall Time Constant = 100ms,
	Rsource < 0.5Ω
	Field Decay :
	5ms < tfall < 10ms, Rsource < 10Ω
	τr Rise Time Constant = 33ms
Tj, Tstg	Junction and Storage Temperature Range

THERMAL DATA

Symbol	Parameter
Rth j-case	Thermal Resistance Junction-case
Rth j-amb	Thermal Resistance Junction-ambient

PIN CONNECTION (top view)

TEST AND APPLICATION CIRCUIT

The output capacitor is required for stability. Though the 100 μF shown is the minimum recommended value, actual size and type may vary depending upon the application load and temperature range. Capacitor effectiveseries resistance (ESR) also factors in the IC stability. Since ESR varies from one brandto the next,some bench work may be required to determine the minimum capacitor value to use in production. Worst-case is usually determined at the minimum ambient temperature and maximum load expected.

Output capacitors can be increased in size to any desired value above the minimum. One possible purpose of this would be to maintain the output voltages during brief conditions of negative input transients that might be characteristics of a particular system.

Value	Unit
+ 35	V
- 18	V
60	V
- 60	V
- 55 to + 150	°C

		SOT82	TO220	Unit
	Max.	8	4	°C/W
	Max.	100	75	°C/W
	Order Codes		Output Voltage
	TO-220	SOT-82
	L4805CV	L4805CX	5V
	L4808CV	L4808CX	8V
	L4885CV	L4885CX	8.5 V
	L4892CV	L4892CX	9.2 V
	L4810CV	L4810CX	10 V
	L4812CV	L4812CX	12 V

Capacitors must also be rated at all ambient temperature expected in the system. Many aluminum type electrolytics will freeze at temperatures less than ± 30 °C, reducing their effective capacitance to zero. To maintain regulator stability down to ± 40 °C, capacitors rated at that temperature (such as tantalums) must be used.

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L4805-L4808-L4885-L4892-L4810-L4812

ELECTRICAL CHARACTERISTICS (VI = 14.4V; CO = 100μF; Tj = 25°C unless otherwise specified.)

Symbol	Parameter	T est Con di tio n	Min. Typ. Max. Uni t
VO	Output Voltage	IO = 5mA to 400mA (L4805)	4.80	5.00	5.20	V
		IO = 5mA to 400mA (L4808)	7.68	8.00	8.32	V
		IO = 5mA to 400mA (L4810)	8.16	8.50	8.84	V
		IO = 5mA to 400mA (L4812)	8.83	9.20	9.57	V
		IO = 5mA to 400mA (L4885)	9.60	10.00	10.40	V
		IO = 300mA (L4892)	11.50	12.00	12.50	V
VI	Operating Input Voltage				26	V
VO/VO	Line Regulation	VI = 13 to 26V; IO = 5mA		1	10	mV/V
VO/VO	Load Regulation	IO = 5 to 400mA*		3	15	mV/V
VI - VO	Dropout Voltage	IO = 400mA*		0.4	0.7	V
		IO = 150mA		0.2	0.4	V
Iq	Quiescent Current	IO = 0mA		0.8	2	mA
		IO = 150mA		25	45	mA
		IO = 400mA*		65	90	mA
VO	Temperature Output Voltage			0.1		mV
•	Drift					° •
T VO						C V
SVR	Supply Voltage Rejection	IO = 350mA; f = 320Hz;		60		dB
		CO = 100μF; VI = VO +3V+2Vpp
IO	Max Output Current			800		mA
ISC	Output Short Circuit Current			350	500	mA
	(fold back condition)

* only for L4892 the current test conditions is IO = 300mA

ELECTRICAL CHARACTERISTICS (VI = 14.4V; CO = 100μF; Tj = -40 to 125°C (note 1) unless otherwise specified.)

Symbol	Parameter	T est Con di tio n	Min. Typ. Max. Uni t
VO	Output Voltage	IO = 5mA to 400mA (L4805)	4.70	5.00	5.30	V
		IO = 5mA to 400mA (L4808)	7.50	8.00	8.50	V
		IO = 5mA to 400mA (L4810)	8.00	8.50	9.00	V
		IO = 5mA to 400mA (L4812)	8.65	9.20	9.75	V
		IO = 5mA to 400mA (L4885)	9.40	10.00	10.60	V
		IO = 300mA (L4892)	11.30	12.00	12.70	V
VI	Operating Input Voltage	see note 2			26	V
VO/VO	Line Regulation	VI = 14 to 26V; IO = 5mA		2	15	mV/V
VO/VO	Load Regulation	IO = 5 to 400mA*		5	25	mV/V
VI - VO	Dropout Voltage	IO = 400mA*		0.5	0.9	V
		IO = 150mA		0.25	0.5	V
Iq	Quiescent Current	IO = 0mA		1.2	3	mA
		IO = 150mA		40	70	mA
		IO = 400mA*		80	140	mA
IO	Max Output Current			870		mA
ISC	Output Short Circuit Current			230		mA
	(fold back condition)

Notes : 1. This limits are guaranteed by design, correlation and statistical control on production samples over the indicated temperature and supply voltage ranges..

2. For a DC voltage 26V < Vi < 35V the device is not operating.

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