LM317KCS datasheet(3/22 Pages) TI

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Recommended Operating Conditions

Electrical Characteristics

LM317

3-TERMINAL ADJUSTABLE REGULATOR

SLVS044R – SEPTEMBER 1997 – REVISED APRIL 2007

MIN

MAX

UNIT

VI – VO

Input-to-output differential voltage

Output current

1.5

Operating virtual junction temperature

125

°C

over recommended ranges of operating virtual junction temperature (unless otherwise noted)

PARAMETER

TEST CONDITIONS(1)

MIN

TYP

MAX

UNIT

TJ = 25°C

0.01

0.04

Line regulation(2)

VI – VO = 3 V to 40 V

%/V

TJ = 0°C to 125°C

0.02

0.07

VO ≤ 5 V

CADJ = 10 µF,(3)

TJ = 25°C

VO ≥ 5 V

0.1

0.5

%VO

Load regulation

IO = 10 mA to 1500 mA

VO ≤ 5 V

TJ = 0°C to 125°C

VO ≥ 5 V

0.3

1.5

%VO

Thermal regulation

20-ms pulse,

TJ = 25°C

0.03

0.07

%VO/W

ADJUST terminal current

100

µA

Change in

VI – VO = 2.5 V to 40 V, PD ≤ 20 W, IO = 10 mA to 1500 mA

0.2

µA

ADJUST terminal current

Reference voltage

VI – VO = 3 V to 40 V, PD ≤ 20 W, IO = 10 mA to 1500 mA

1.2

1.25

1.3

Output-voltage

TJ = 0°C to 125°C

0.7

%VO

temperature stability

Minimum load current

VI – VO = 40 V

3.5

to maintain regulation

VI – VO ≤ 15 V,

PD < PMAX(4)

1.5

2.2

Maximum output current

VI – VO ≤ 40 V,

PD < PMAX (4),

TJ = 25°C

0.15

0.4

RMS output noise voltage

f = 10 Hz to 10 kHz,

TJ = 25°C

0.003

%VO

(% of VO)

CADJ = 0 µF(3)

Ripple rejection

VO = 10 V,

f = 120 Hz

CADJ = 10 µF(3)

Long-term stability

TJ = 25°C

0.3

%/1k hr

(1)

Unless otherwise noted, the following test conditions apply: |VI – VO| = 5 V and IOMAX = 1.5 A, TJ = 0°C to 125°C. Pulse testing

techniques are used to maintain the junction temperature as close to the ambient temperature as possible.

(2)

Line regulation is expressed here as the percentage change in output voltage per 1-V change at the input.

(3)

CADJ is connected between the ADJUST terminal and GND.

(4)

Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient

temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

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