SGS Thomson Microelectronics LM317P, LM317K, LM317D2T, LM217T, LM217K Datasheet

	LM117/217
	LM317

1.2V TO 37V VOLTAGE REGULATOR

■OUTPUT VOLTAGE RANGE : 1.2 TO 37V

■OUTPUT CURRENT IN EXCESS OF 1.5A

■0.1% LINE AND LOAD REGULATION

■FLOATING OPERATION FOR HIGH VOLTAGES

■COMPLETE SERIES OF PROTECTIONS : CURRENT LIMITING, THERMAL SHUTDOWN AND SOA CONTROL

DESCRIPTION
The LM117/LM217/LM317	are monolithic			D2PAK
integrated circuit in TO-220, ISOWATT220, TO-3		TO-3
and D2PAK packages intended for use as
positive adjustable voltage regulators.
They are designed to supply more than 1.5A of
load current with an output voltage adjustable
over a 1.2 to 37V range.
The nominal output voltage is selected by means
of only a resistive divider, making the device
exceptionally easy to use and eliminating the
stocking of many fixed regulators.
		TO-220	ISOWATT220
ABSOLUTE MAXIMUM RATING
Symbol	Parameter		Value	Unit

Vi-o

IO

Top

Ptot

Tst g

Input-output Differential Voltage		40	V
Output Current	Intenrally Limited
Operating Junction Temperature for: LM117	-55	to 150	oC
LM217	-25	to 150	oC
LM317	0 to 125		oC
Power Dissipation	Internally Limited
Storage Temperature	- 65 to 150		oC

THERMAL DATA

Symbol	Parameter		TO-3	TO-220	ISOWATT220	D2PAK	Unit
Rthjca se	Thermal Resistance Junction-case	Max	4	3	4	3	oC/W
Rthjamb	Thermal Resistance Junction-ambient	Max	35	50	60	62.5	oC/W

November 1999

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LM117/217/317

CONNECTION DIAGRAM AND ORDERING NUMBERS (top view)

TO-220

ISOWATT220

D2PAK

TO-3

Type	TO-3	TO-220	ISOWATT220	D2PAK
LM117	LM117K
LM217	LM217K	LM217T		LM217D2T
LM317	LM317K	LM317T	LM317P	LM317D2T

SCHEMATIC DIAGRAM

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LM117/217/317

BASIC ADJUSTABLE REGULATOR

ELECTRICAL CHARACTERISTICS (Vi - Vo = 5 V, Io = 500 mA, IMAX = 1.5A and PMAX = 20W, unless otherwise specified)

Symbol	Parameter	Test Conditions	LM117/LM217	LM317	Unit
			Min. Typ. Max. Min. Typ. Max.

Vo	Line Regulation	Vi - Vo = 3 to 40 V
Vo	Load Regulation	Vo ≤ 5V
		Io = 10 mA to IMAX
		Vo ≥ 5V
		Io = 10 mA to IMAX
IADJ	Adjustment Pin Current
IADJ	Adjustment Pin Current	Vi - Vo = 2.5 to 40 V
		Io = 10 mA to IMAX
VREF	Reference Voltage	Vi - Vo = 2.5 to 40 V
	(between pin 3 and pin	Io = 10 mA to IMAX
	1)	PD ≤ PMAX
Vo	Output Voltage
Vo	Temperature Stability

Tj = 25 oC	0.01	0.02		0.01 0.04 %/V
	0.02	0.05		0.02	0.07	%/V
Tj = 25 oC	5	15		5	25	mV
	20	50		20	70	mV
Tj = 25 oC	0.1	0.3		0.1	0.5	%
	0.3	1		0.3	1.5	%
	50	100		50	100	μA
	0.2	5		0.2	5	μA
1.2	1.25	1.3	1.2	1.25	1.3	V
	1			1		%

Io (m in)	Minimum Load Current	Vi - Vo = 40 V			3.5	5		3.5	10 mA
Io (max )	Maximum Load	Vi - Vo ≤ 15 V		1.5	2.2		1.5	2.2	A
	Current	PD < PMAX
		Vi - Vo = 40 V			0.4			0.4	A
		PD < PMAX
		Tj = 25 oC
eN	Output Noise Voltage	B = 10Hz to 10KHz			0.003			0.003	%
	(percentance of VO)	Tj = 25 oC
SVR	Supply Voltage	Tj = 25 oC	CADJ =0		65			65	dB
	Rejection (*)	f = 120 Hz	CADJ=10μF	66	80		66	80	dB

(*) CADJ is connected between pin 1 and ground.

Note:

(1) Unless otherwise specified the above specs, apply over the following conditions : LM 117 Tj = ± 55 to 150°C; LM 217 Tj = ± 25 to 150°C ; LM 317 Tj = 0 to 125°C.

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LM117/217/317

Figure 1 : Output Current vs. Input-output Differential Voltage.

Figure 3 : Reference Voltage vs. Junction

APPLICATION INFORMATION

The LM117/217/317 provides an internal reference voltage of 1.25V between the output and adjustments terminals. This is used to set a constant current flow across an external resistor divider (see fig. 4), giving an output voltage VO of:

VO = VREF (1 + R2) + IADJ R2

R1

The device was designed to minimize the term IADJ (100μA max) and to maintain it very constant with line and load changes. Usually, the error term IADJ R2 can be neglected. To obtain the previous requirement, all the regulator quiescent current is returned to the output terminal, imposing a minimum load current condition. If the load is insufficient, the output voltage will rise.

Since the LM117/217317 is a floating regulator and ºseesº only the input-to-output differential

Figure 2 : Dropout Voltage vs. Junction Temperature.

Figure 4 : Basic Adjustable Regulator.

voltage, supplies of very high voltage with respect to ground can be regulated as long as the maximum input-to-output differential is not exceeded. Furthermore, programmable regulator are easily obtainable and, by connecting a fixed resistor between the adjustment and output, the device can be used as a precision current regulator.

In order to optimise the load regulation, the current set resistor R1 (see fig. 4) should be tied as close as possible to the regulator, while the ground terminal of R2 should be near the ground of the load to provide remote ground sensing.

Performance may be improved with added capacitance as follow:

An input bypass capacitor of 0.1μF

An adjustment terminal to ground 10μF capacitor

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