Fairchild Semiconductor KA7924, KA7918, KA7915, KA7908, KA7906 Datasheet

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KA79XX/KA79XXA

3-Terminal 1A Negative Voltage Regulator

Features	Description
• Output Current in Excess of 1A	The KA79XX/KA79XXA series of three-terminal negative
• Output Voltages of -5, -6, -8, -9, -10, -12, -15, -18 , -24V	regulators are available in TO-220 package and with
• Internal Thermal Overload Protection	several fixed output voltages, making them useful in a wide
• Short Circuit Protection	range of applications. Each type employs internal current
• Output Transistor Safe Operating Area Compensation	limiting, thermal shutdown and safe operating area
	protection, making it essentially indestructible.
	TO-220	Vin

1

1. GND 2. Input 3. Output

Internal Block Digram

GND
		R1
VOLTAGE		R2
REFERENCE
	+	Output
	-	Q1
		Q2
		PROTECTION
I1	I2	CIRCUITRY
		Rsc
		In
		Input

Rev. 1.0.1

©2002 Fairchild Semiconductor Corporation

KA79XX/KA79XXA

Absolute Maximum Ratings

Parameter	Symbol	Value	Unit
Input Voltage	VI	-35	V
Thermal Resistance Junction-Case (Note1)	Rθ JC	5	° C/W
Thermal Resistance Junction-Air (Note1, 2)	Rθ JA	65	° C/W
Operating Temperature Range	TOPR	0 ~ +125	° C
Storage Temperature Range	TSTG	- 65 ~ +150	° C

Note:

1. Thermal resistance test board

Size: 76.2mm * 114.3mm * 1.6mm(1S0P) JEDEC standard: JESD51-3, JESD51-7

2. Assume no ambient airflow

Electrical Characteristics (KA7905)

(VI = -10V, IO = 500mA, 0° C ≤ TJ ≤		+125° C, CI =2.2 F, CO =1 F, unless otherwise specified.)
Parameter	Symbol		Conditions			Min.	Typ.	Max.	Unit
Output Voltage		VO	TJ = +25° C			-4.8	-5.0	-5.2	V
			IO = 5mA to 1A, PO ≤ 15W			-4.75	-5.0	-5.25
			VI = -7V to -20V
Line Regulation (Note3)		∆ VO	TJ = +25° C		VI = -7V to -25V	-	35	100	mV
					VI = -8V to -12V	-	8	50
Load Regulation (Note3)		∆ VO	TJ = +25° C, IO = 5mA to 1.5A			-	10	100	mV
			TJ =+25° C, IO = 250mA to 750mA			-	3	50
Quiescent Current		IQ	TJ =+25° C			-	3	6	mA
Quiescent Current Change		∆ IQ	IO = 5mA to 1A			-	0.05	0.5	mA
			VI = -8V 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, TA = +25° C			-	40	-	V
Ripple Rejection		RR	f = 120Hz, ∆ VI = 10V			54	60	-	dB
Dropout Voltage		VD	TJ =+25° C, IO = 1A			-	2	-	V
Short Circuit Current		ISC	TJ =+25° C, VI = -35V			-	300	-	mA
Peak Current		IPK	TJ =+25° C			-	2.2	-	A

Note

3.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.

2

KA79XX/KA79XXA

Electrical Characteristics (KA7906) (Continued)

(VI = -11V, IO = 500mA, 0° C ≤ TJ ≤		+125° C, CI =2.2 F, CO = 1 F, unless otherwise specified.)
Parameter		Symbol	Conditions		Min.	Typ.	Max.	Unit
Output Voltage		VO	TJ =+25° C		-5.75	-6	-6.25	V
			IO = 5mA to 1A, PO ≤ 15W		-5.7	-6	-6.3
			VI = -9V to -21V
Line Regulation (Note1)		∆ VO	TJ = +25° C	VI = -8V to -25V	-	10	120	mV
				VI = -9V to -13V	-	5	60
Load Regulation (Note1)		∆ VO	TJ = +25° C, IO = 5mA to 1.5A		-	10	120	mV
			TJ = +25° C, IO = 250mA to 750mA		-	3	60
Quiescent Current		IQ	TJ = +25° C		-	3	6	mA
Quiescent Current Change		∆ IQ	IO = 5mA to 1A		-	0.05	0.5	mA
			VI = -8V to -25V		-	0.1	1.3
Temperature Coefficient of VD		∆ Vo/∆ T	IO = 5mA		-	-0.5	-	mV/° C
Output Noise Voltage		VN	f = 10Hz to 100kHz, TA =+25° C		-	130	-	V
Ripple Rejection		RR	f = 120Hz, ∆ VI = 10V		54	60	-	dB
Dropout Voltage		VD	TJ = +25° C, IO = 1A		-	2	-	V
Short Circuit Current		ISC	TJ = +25° C, VI = -35V		-	300	-	mA
Peak Current		IPK	TJ = +25° C		-	2.2	-	A

Note

1.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.

3

KA79XX/KA79XXA

Electrical Characteristics (KA7908) (Continued)

(VI = -14V, IO = 500mA, 0° C ≤ TJ ≤		+125° C, CI =2.2 F, CO =1 F, unless otherwise specified.)
Parameter		Symbol	Conditions			Min.	Typ.	Max.	Unit
Output Voltage		VO	TJ =+25° C			-7.7	-8	-8.3	V
			IO = 5mA to 1A, PO ≤ 15W			-7.6	-8	-8.4
			VI = -10V to -23V
Line Regulation (Note1)		∆ VO	TJ = +25° C		VI = -10.5V to -25V	-	10	160	mV
					VI = -11V to -17V	-	5	80
Load Regulation (Note1)		∆ VO	TJ = +25° C, IO =	5mA to 1.5A		-	12	160	mV
			TJ = +25° C, IO = 250mA to 750mA			-	4	80
Quiescent Current		IQ	TJ = +25° C			-	3	6	mA
Quiescent Current Change		∆ IQ	IO = 5mA to 1A			-	0.05	0.5	mA
			VI = -10.5V 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, TA = +25° C			-	175	-	V
Ripple Rejection		RR	f = 120Hz, ∆ VI = 10V			54	60	-	dB
Dropout Voltage		VD	TJ =+25° C, IO = 1A			-	2	-	V
Short Circuit Current		ISC	TJ =+25° C, VI = -35V			-	300	-	mA
Peak Current		IPK	TJ = +25° C			-	2.2	-	A

Note

1.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.

4

KA79XX/KA79XXA

Electrical Characteristics (KA7909) (Continued)

	(VI = -15V, IO = 500mA, 0° C ≤ TJ ≤	+125° C, CI =2.2 F, CO =1 F, unless otherwise specified.)
	Parameter	Symbol		Conditions		Min.	Typ.	Max.	Unit
	Output Voltage	VO	TJ = +25° C			-8.7	-9.0	-9.3	V
			IO = 5mA to 1A, PO ≤ 15W			-8.6	-9.0	-9.4
			VI = -1.5V to -23V
	Line Regulation (Note1)	∆ VO	TJ =+25° C		VI = -11.5V to -26V	-	10	180	mV
					VI = -12V to -18V	-	5	90
	Load Regulation (Note1)	∆ VO	TJ =+25° C, IO =		5mA to 1.5A	-	12	180	mV
			TJ =+25° C, IO = 250mA to 750mA			-	4	90
	Quiescent Current	IQ	TJ = +25° C			-	3	6	mA
	Quiescent Current Change	∆ IQ	IO = 5mA to 1A			-	0.05	0.5	mA
			VI = -11.5V to -26V			-	0.1	1
	Temperature Coefficient of VD	∆ Vo/∆ T	IO = 5mA			-	-0.6	-	mV/° C
	Output Noise Voltage	VN	f = 10Hz to 100kHz, TA = +25° C			-	175	-	V
	Ripple Rejection	RR	f = 120Hz, ∆ VI = 10V			54	60	-	dB
	Dropout Voltage	VD	TJ = +25° C, IO = 1A			-	2	-	V
	Short Circuit Current	ISC	TJ = +25° C, VI = -35V			-	300	-	mA
	Peak Current	IPK	TJ = +25° C			-	2.2	-	A

Note

1.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.

5

KA79XX/KA79XXA

Electrical Characteristics (KA7910) (Continued)

(VI = -17V, IO = 500mA, 0° C ≤ TJ ≤		+125° C, CI =2.2 F, CO =1 F, unless otherwise specified.)
Parameter		Symbol	Conditions			Min.	Typ.	Max.	Unit
Output Voltage		VO	TJ = +25° C			-9.6	-10	-10.4	V
			IO = 5mA to 1A, PO ≤ 15W			-9.5	-10	-10.5
			VI = -12V to -28
Line Regulation (Note1)		∆ VO	TJ = +25° C		VI = -12.5V to -28V	-	12	200	mV
					VI = -14V to -20V	-	6	100
Load Regulation (Note1)		∆ VO	TJ = +25° C, IO =	5mA to 1.5A		-	12	200	mV
			TJ = +25° C, IO = 250mA to 750mA			-	4	100
Quiescent Current		IQ	TJ = +25° C			-	3	6	mA
Quiescent Current Change		∆ IQ	IO = 5mA to 1A			-	0.05	0.5	mA
			VI = -12.5 to -28V			-	0.1	1
Temperature Coefficient of VO		∆ Vo/∆ T	IO = 5mA			-	-1	-	mV/° C
Output Noise Voltage		VN	10Hz ≤ f ≤ 100kHz, TA = +25° C			-	280	-	V
Ripple Rejection		RR	f = 120Hz, ∆ VI = 10V			54	60	-	dB
Dropout Voltage		VD	TJ = +25° C, IO = 1A			-	2	-	V
Short Circuit Current		ISC	TJ = +25° C, VI = -35V			-	300	-	mA
Peak Current		IPK	TJ = +25° C			-	2.2	-	A

Note

1.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.

6