MOTOROLA LM317MBSTT1, LM317MBDTRK, LM317MBDT, LM317MADTRK, LM317MABT Datasheet

LM317M

Three-Terminal Adjustable

Output Positive Voltage

Regulator

The LM317M is an adjustable three±terminal positive voltage regulator capable of supplying in excess of 500 mA over an output voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blow±out proof.

The LM317M serves a wide variety of applications including local, on±card regulation. This device also makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM317M can be used as a precision current regulator.

•Output Current in Excess of 500 mA

•Output Adjustable between 1.2 V and 37 V

•Internal Thermal Overload Protection

•Internal Short Circuit Current Limiting

•Output Transistor Safe±Area Compensation

•Floating Operation for High Voltage Applications

•Eliminates Stocking Many Fixed Voltages

Simplified Application

Vin			Vout	Vout
Vin	LM317M
			R1
	IAdj		240
*		Adjust	+	**
C				C
in				O
0.1μF				1.0μF
		R2

*= Cin is required if regulator is located an appreciable distance from power supply filter.

**= CO is not needed for stability, however, it does improve transient response.

Vout + 1.25 V 1 ) R2 ) IAdj R2

R1

Since IAdj is controlled to less than 100 μA, the error associated with this term is negligible in most applications.

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Heatsink surface connected to Pin 2

1

2

		3
		TO±220AB
		T SUFFIX
		CASE 221A
		SOT±223
	1	ST SUFFIX
		CASE 318E
	2
		3

	DPAK
	DT SUFFIX	1	2
	CASE 369A
			3

Heatsink Surface (shown as terminal 4 in case outline drawing) is connected to Pin 2.

	PIN ASSIGNMENT
1	Adjust
2	Vout
3	Vin

ORDERING INFORMATION

See detailed ordering and shipping information in the package dimensions section on page 10 of this data sheet.

Semiconductor Components Industries, LLC, 1999	1	Publication Order Number:
November, 1999 ± Rev. 6		LM317M/D

LM317M

MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)

Rating

Symbol

Value

Unit

Input±Output Voltage Differential

VI±VO

40

Vdc

Power Dissipation (Package Limitation) (Note 1)

Plastic Package, T Suffix, Case 221A

TA = 25°C

PD

Internally Limited

Thermal Resistance, Junction±to±Air

θJA

70

°C/W

Thermal Resistance, Junction±to±Case

θJC

5.0

°C/W

Plastic Package, DT Suffix, Case 369A

TA = 25°C

PD

Internally Limited

Thermal Resistance, Junction±to±Air

θJA

92

°C/W

Thermal Resistance, Junction±to±Case

θJC

5.0

°C/W

Plastic Package, ST Suffix, Case 318E

TA = 25°C

PD

Internally Limited

Thermal Resistance, Junction±to±Air

θJA

245

°C/W

Thermal Resistance, Junction±to±Case

θJC

15

°C/W

Operating Junction Temperature Range

TJ

± 40 to +125

°C

Storage Temperature Range

Tstg

± 65 to +150

°C

NOTE: 1. Figure 23 provides thermal resistance versus pc board pad size.

ELECTRICAL CHARACTERISTICS (VI±VO = 5.0 V; IO = 0.1 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Figure

Symbol

Min

Typ

Max

Unit

Line Regulation (Note 2)

1

Regline

±

0.01

0.04

%/V

TA = 25°C, 3.0 V ≤ VI±VO ≤ 40 V

Load Regulation (Note 2)

2

Regload

TA = 25°C, 10 mA ≤ IO ≤ 0.5 A

VO

≤ 5.0 V

±

5.0

25

mV

VO

≥ 5.0 V

±

0.1

0.5

% VO

Adjustment Pin Current

3

IAdj

±

50

100

μA

Adjustment Pin Current Change

1,2

IAdj

±

0.2

5.0

μA

2.5 V ≤ VI±VO ≤ 40 V, 10 mA ≤ IL ≤ 0.5 A, PD ≤ Pmax

Reference Voltage

3

Vref

V

3.0 V ≤ VI±VO ≤ 40 V, 10 mA ≤ IO ≤ 0.5 A, PD ≤ Pmax:

1.200

1.250

1.300

Line Regulation (Note 2)

1

Regline

±

0.02

0.07

%/V

3.0 V ≤ VI±VO ≤ 40 V

Load Regulation (Note 2)

2

Regload

10 mA ≤ IO ≤ 0.5 A

VO

≤ 5.0 V

±

20

70

mV

VO

≥ 5.0 V

±

0.3

1.5

% VO

Temperature Stability (Tlow ≤ TJ ≤ Thigh)

3

TS

±

0.7

±

% VO

Minimum Load Current to Maintain Regulation

3

ILmin

±

3.5

10

mA

(VI±VO = 40 V)

Maximum Output Current

3

Imax

A

VI±VO ≤ 15 V, PD ≤ Pmax

0.5

0.9

±

VI±VO = 40 V, PD ≤ Pmax, TA = 25°C

0.15

0.25

±

RMS Noise, % of VO

±

N

±

0.003

±

% VO

TA= 25°C, 10 Hz ≤ f ≤ 10 kHz

Ripple Rejection, VO = 10 V, f = 120 Hz (Note 3)

4

RR

dB

Without CAdj

±

65

±

CAdj = 10 μF

66

80

±

Long±Term Stability, TJ = Thigh (Note 4)

3

S

±

0.3

1.0

%/1.0 k

TA= 25°C for Endpoint Measurements

Hrs.

NOTES: 1. Tlow to Thigh = 0° to +125°C for LM317M

Tlow to Thigh = ± 40° to +125°C for LM317MB

2.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 cycle is used.

3.CAdj, when used, is connected between the adjustment pin and ground.

4.Since Long±Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot.

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LM317M

Representative Schematic Diagram

Vin
300	300		300	3.0k	300	70	6.8V
							6.8V
350
							18k
		8.67k					500
	130
				5.1k			400
200k
180	180	2.0k	6.0k	10		60	1.25
6.3V				pF	10
					pF

Vout

2.4k

12.8k 50

Adjust

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LM317M

Figure 1. Line Regulation and			IAdj/Line Test Circuit
VCC						VOH ± VOL
			Line Regulation (%/V) =				x 100
*						VOL
VIH			Vout				VOH
VIL	Vin	LM317M					VOL
		Adjust	R1	240			RL
				1%	+
	0.1μF					1.0μF
Cin		IAdj			CO
* Pulse Testing Required:		R2

1% Duty Cycle is suggested.	1%

Figure 2. Load Regulation and IAdj/Load Test Circuit

Vin Vin

Cin 0.1μF

* Pulse Testing Required:

1% Duty Cycle is suggested.

	Load Regulation (mV) = VO (min Load) ±VO (max Load)
	VO (min Load) ± VO (max Load)		X 100
	Load Regulation (% VO) =	VO (min Load)
			VO (min Load)
	Vout		VO (max Load)
LM317M
	IL
			RL
	240		(max Load)
Adjust			RL
	R1 1%	*
		+	(min Load)
IAdj	CO	1.0μF
R2
1%

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