ST LM723 User Manual

LM723C

LM723

HIGH PRECISION VOLTAGE REGULATOR

■INPUT VOLTAGE UP TO 40V

■OUTPUT VOLTAGE ADJUSTABLE FROM 2 TO 37V

■POSITIVE OR NEGATIVE SUPPLY OPERATION

■SERIES, SHUNT, SWITCHING OR FLOATING OPERATION

■OUTPUT CURRENT TO 150mA WITHOUT EXTERNAL PASS TRANSISTOR

■ADJUSTABLE CURRENT LIMITING

DESCRIPTION	Plastic DIP-14	SO-14

The LM723 is a monolithic integrated programmable voltage regulator, assembled in 14-lead dual in-line plastic and SO-14 micropackage. The circuit provides internal current limiting. When the output current excedes 150mA an external NPN or PNP pass element may be used. Provisions are made for adjustable current limiting and remote shut-down.

BLOCK DIAGRAM

September 1998

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LM723

ABSOLUTE MAXIMUM RATINGS

Symbol		Parameter		Value	Unit
		LM723		LM723C
Vi	DC Input Voltage		40	40	V
Vi-o	Dropout Voltage		40	40	V
Io	Output Current		150	150	mA
Iref	Current from Vref		15	25	mA
To p	Operating Temperature	-55	to 125	0 to 70	oC
Tstg	Storage Temperature	-65	to 150	-65 to 150	oC
Tj	Junction Temperature		150	125	oC

ABSOLUTE MAXIMUM RATINGS

Symbol	Parameter		Plastic DIP-14	SO-14	Unit
Rthj-a mb	Thermal Resistance Junction-Ambient	Max	200	160	oC/W

PIN CONNECTION (top views)

ORDER CODES

Type	Plastic DIP-14	SO-14
LM723	LM723N
LM723C	LM723CN	LM723CD

TEST CIRCUIT (pin configuration relative to the plastic package)

Vi = 12V

Vo = 5V

Io = 1mA

R1/R2 ≤ 10KΩ

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LM723

ELECTRICAL CHARACTERISTICS FOR LM723 (refer to the test circuits, Tamb = 25 oC, unless otherwise specified)

Symbol		Parameter	Test Conditions			Min.	Typ.	Max.	Unit
Vo/	Vi	Line Regulation	Vi = 12 to 15V				0.01	0.1	%
			Vi = 12 to 40V	-55oC ≤ Tamb ≤ 125oC			0.02	0.2	%
			Vi = 12 to 15V					0.3	%
Vo /Vo		Load Regulation	Io = 1 to 50 mA	-55oC ≤ Tamb ≤ 125oC			0.03	0.15	%
			Io = 1 to 10 mA					0.6	%
VREF		Reference Voltage	Iref = 160 μA			6.95	7.15	7.35	V
SVR		Supply Voltage Rejection	f = 100 Hz to 10 KHz		Cref = 0		74		dB
			f = 100 Hz to 10 KHz		Cref = 5 μF		86		dB
Vo/	T	Output Voltage Drift						150 ppm/oC
Isc		Output Current Limit	Rsc = 10Ω Vo = 0				65		mA
Vi		Input Voltage Range				9.5		40	V
Vo		Output Voltage Range				2		37	V
Vo-Vi						3		38	V
Id		Quiescent Current	Vi = 30 V Io = 0 mA				2.3	5	mA
KVH		Long Term Stability					0.1		%/1000
									hrs
eN		Output Noise Voltage	BW = 100 Hz to 10 KHz		Cref = 0		20		μV
			BW = 100 Hz to 10 KHz		Cref = 5 μF		2.5		μV

ELECTRICAL CHARACTERISTICS FOR LM723C (refer to the test circuits, Tamb = 25 oC, unless otherwise specified)

Symbol		Parameter	Test Conditions			Min.	Typ.	Max.	Unit
Vo/	Vi	Line Regulation	Vi = 12 to 15V				0.01	0.1	%
			Vi = 12 to 40V	0oC ≤ Tamb ≤ 70oC			0.1	0.5	%
			Vi = 12 to 15V					0.3	%
Vo /Vo		Load Regulation	Io = 1 to 50 mA	0oC ≤ Tamb ≤ 70oC			0.03	0.2	%
			Io = 1 to 10 mA					0.6	%
VREF		Reference Voltage	Iref = 160 μA			6.8	7.15	7.5	V
SVR		Supply Voltage Rejection	f = 100 Hz to 10 KHz		Cref = 0		74		dB
			f = 100 Hz to 10 KHz		Cref = 5 μF		86		dB
Vo/	T	Output Voltage Drift						150 ppm/oC
Isc		Output Current Limit	Rsc = 10Ω Vo = 0				65		mA
Vi		Input Voltage Range				9.5		40	V
Vo		Output Voltage Range				2		37	V
Vo-Vi						3		38	V
Id		Quiescent Current	Vi = 30 V Io = 0 mA				2.3	4	mA
KVH		Long Term Stability					0.1		%/1000
									hrs
eN		Output Noise Voltage	BW = 100 Hz to 10 KHz		Cref = 0		20		μV
			BW = 100 Hz to 10 KHz		Cref = 5 μF		2.5		μV

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LM723

Figure 1 : Maximum Output Current vs. Voltage	Figure 2 : Current Limiting Characteristics.
Drop.

Figure 3 : Current Limiting Characteristics vs.	Figure 4 : Load Regulation Characteristics
Junction Temperature.	without Current Limiting.

Figure 5 : Load Regulation Characteristics with	Figure 6 : Load Regulation Characteristics with
Current Limiting.	Current Limiting

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