Fairchild Semiconductor LM7918AT, LM7915CT, LM7915AT, LM7905CT, LM7905AT Datasheet

LM79XX/A (KA79XX, MC79XX) FIXED VOLTAGE REGULATOR (NEGATIVE)

3-TERMINAL 1A NEGATIVE VOLTAGE REGULATORS
The LM79XX series of three-terminal negative regulators are available in
		TO-220
TO-220 package and with several fixed output voltages, making them useful
in a wide range of applications. Each type employs internal current limiting,
thermal shut-down and safe area protection, making it essentially indestructible.

FEATURES
∙	Output Current in Excess of 1A
∙	Output Voltages of -5, -6, -8, -12, -15, -18, -24V
						1: GND 2: Input 3: Output
∙	Internal Thermal Overload Protection
∙	Short Circuit Protection
∙	Output Transistor Safe-Area Compensation	ORDERING INFORMATION
		Device	Output Voltage		Package		Operating Temperature
			Tolerance
		LM79XXCT	± 4%		TO-220		0 ~ +125 °C
		LM79XXAT	± 2%

BLOCK DIAGRAM

GND

		R1
VOLTAGE		R2
REFERENCE
	+	Out
		Q1
	-
		Q2
		PROTECTION
I1	I2	CIRCUITRY
		Rsc

In

Rev. B

ã1999 Fairchild Semiconductor Corporation

LM79XX/A (KA79XX, MC79XX) FIXED VOLTAGE REGULATOR (NEGATIVE)

ABSOLUTE MAXIMUM RATINGS (TA=+25°C, unless otherwise specified)

Characteristic	Symbol	Value	Unit
Input Voltage	VI	-35	V
Thermal Resistance Junction-Cases	RθJC	5	°C / W
Junction-Air	RθJA	65	°C /W
Operating Temperature Range	TOPR	0 ~ +125	°C
Storage Temperature Range	TSTG	- 65 ~ +150	°C

LM7905 ELECTRICAL CHARACTERISTICS

(VI = 10V, lO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO =1μF, unless otherwise specified.)

Characteristic	Symbol	Test Conditions		Min	Typ	Max	Unit
		TJ =+25°C		- 4.8	- 5.0	- 5.2
Output Voltage	VO	IO = 5mA to 1A, PO 15W		- 4.75	-5.0	- 5.25	V
		VI = -7 to -20V
			VI = -7 to -20V		5	50	mV
			IO=1A
		TJ =25°C
			VI = -8 to -12V		2	25
Line Regulation	VO		IO=1A
		VI = -7.5 to -25V			7	50
		VI= -8 to -12V			7	50
		IO=1A
		IO = 5mA to 1.5A			10	100
Load Regulation	VO	TJ =+25°C			3	50	mV
		IO = 250 to 750mA
Quiescent Current	IQ	TJ =+25°C			3	6	mA
Quiescent Current Change	IQ	IO = 5mA to 1A			0.05	0.5	mA
		VI = -8 to -25V			0.1	0.8
Temperature Coefficient of VD	VO/ T	IO = 5mA			- 0.4		mV/°C
Output Noise Voltage	VN	f = 10Hz to 100KHz			40		μV
		TA =+25°C
Ripple Rejection	RR	f = 120Hz, IO = -35V		54	60		dB
		VI = 10V
Dropout Voltage	VD	TJ=+25°C			2		V
		IO = 1A
Short Circuit Current	ISC	TJ =+25°C, VI = -35V			300		mA
Peak Current	IPK	TJ =+25°C			2.2		A

*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 is used.

LM79XX/A (KA79XX, MC79XX) FIXED VOLTAGE REGULATOR (NEGATIVE)

LM7906 ELECTRICAL CHARACTERISTICS

(VI = 11V, lO = 500mA, 0°C ≤TJ≤ +125°C, CI =2.2μF, CO = 1μF, unless otherwise specified.)

Characteristic	Symbol	Test Conditions		Min	Typ	Max	Unit
		TJ = +25°C		- 5.75	- 6	- 6.25
Output Voltage	VO	IO = 5mA to 1A, PO 15W		- 5.7	- 6	- 6.3	V
		VI = - 9 to - 21V
Line Regulation	VO	TJ = 25°C	VI = - 8 to - 25V		10	120	mV
			VI= - 9 to -12V		5	60
		TJ =+ 25°C			10	120
		IO = 5mA to 1.5A
Load Regulation	VO						mV
		TJ =+ 25°C			3	60
		IO = 250 to 750mA
Quiescent Current	IQ	TJ =+ 25°C			3	6	mA
Quiescent Current Change	IQ	IO = 5mA to 1A				0.5	mA
		VI = -9 to -25V				1.3
Temperature Coefficient of VD	VO/ T	IO = 5mA			-0.5		mV/°C
Output Noise Voltage	VN	f = 10Hz to 100KHz			130		μV
		TA =+ 25°C
Ripple Rejection	RR	f = 120Hz		54	60		dB
		VI = 10V
Dropout Voltage	VD	TJ=+ 25°C			2		V
		IO = 1A
Short Circuit Current	ISC	TJ= +25°C, VI = -35V			300		mA
Peak Current	IPK	TJ= +25°C			2.2		A

* 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 is used.

LM79XX/A (KA79XX, MC79XX) FIXED VOLTAGE REGULATOR (NEGATIVE)

LM7908 ELECTRICAL CHARACTERISTICS

(VI = 14V, lO = 500mA, 0°C ≤TJ ≤ +125°C, CI =2.2μF, CO = 1μF, unless otherwise specified.)

Characteristic	Symbol	Test Conditions		Min	Typ	Max	Unit
		TJ =+ 25°C		- 7.7	- 8	- 8.3
Output Voltage	VO	IO = 5mA to 1A, PO 15W		- 7.6	- 8	- 8.4	V
		VI = -1.5 to -23V
Line Regulation	VO	TJ = 25°C	VI = -10.5 to -25V		10	100	mV
			VI= -11 to -17V		5	80
		TJ =+ 25°C			12	160
		IO = 5mA to 1.5A
Load Regulation	VO						mV
		TJ =+ 25°C			4	80
		IO = 250 to 750mA
Quiescent Current	IQ	TJ =+ 25°C			3	6	mA
Quiescent Current Change	IQ	IO = 5mA to 1A			0.05	0.5	mA
		VI = -11.5 to -25V			0.1	1
Temperature Coefficient of VD	VO/ T	IO = 5mA			-0.6		mV/°C
Output Noise Voltage	VN	f = 10Hz to 100KHz			175		μV
		TA =+ 25°C
Ripple Rejection	RR	f = 120Hz		54	60		dB
		VI = 10V
Dropout Voltage	VD	TJ=+ 25°C			2		V
		IO = 1A
Short Circuit Current	ISC	TJ=+ 25°C, VI = -35V			300		mA
Peak Current	IPK	TJ=+ 25°C			2.2		A

* 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 is used.

LM79XX/A (KA79XX, MC79XX) FIXED VOLTAGE REGULATOR (NEGATIVE)

LM7909 ELECTRICAL CHARACTERISTICS

(VI = 14V, lO = 500mA, 0°C ≤TJ ≤+ 125°C, CI =2.2μF, CO = 1μF, unless otherwise specified)

Characteristic	Symbol	Test Conditions		Min	Typ	Max	Unit
		TJ =+ 25°C		- 8.7	- 9.0	- 9.3
Output Voltage	VO	IO = 5mA to 1A, PO 15W		- 8.6	- 9.0	- 9.4	V
		VI = -1.5 to -23V
Line Regulation	VO	TJ = 25°C	VI = -10.5 to -25V		10	180	mV
			VI= -11 to -17V		5	90
		TJ =+ 25°C			12	180
		IO = 5mA to 1.5A
Load Regulation	VO						mV
		TJ =+ 25°C			4	90
		IO = 250 to 750mA
Quiescent Current	IQ	TJ =+ 25°C			3	6	mA
Quiescent Current Change	IQ	IO = 5mA to 1A			0.05	0.5	mA
		VI = -11.5 to -25V			0.1	1
Temperature Coefficient of VD	VO/ T	IO = 5mA			-0.6		mV/°C
Output Noise Voltage	VN	f = 10Hz to 100KHz			175		μV
		TA =+ 25°C
Ripple Rejection	RR	f = 120Hz		54	60		dB
		VI = 10V
Dropout Voltage	VD	TJ=+ 25°C			2		V
		IO = 1A
Short Circuit Current	ISC	TJ= +25°C, VI = -35V			300		mA
Peak Current	IPK	TJ =+25°C			2.2		A

* 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 is used.