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LT137A/LM137

LT337A/LM337

137afb

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. (Notes 2, 3)

SYMBOL PARAMETER

CONDITIONS

LT337A

LM337

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

VREF

Reference Voltage

|VIN – VOUT| = 5V, IOUT = 10mA, Tj = 25°C

–1.238

–1.250

–1.262

–1.213

–1.250

–1.287

3V ≤

|VIN – VOUT| ≤ 40V

10mA ≤ IOUT ≤ IMAX, P ≤ PMAX

l –1.220 –1.250 –1.280 –1.200 –1.250 –1.300

ΔVOUT

ΔIOUT

Load Regulation

10mA ≤ IOUT ≤ IMAX, (Notes 4 and 5)

Tj = 25°C, |VOUT| ≤ 5V

Tj = 25°C, |VOUT| ≥ 5V

|VOUT| ≤ 5V

|VOUT| ≥ 5V

0.1

0.2

0.5

0.3

1.5

ΔVOUT

ΔVIN

Line Regulation

3V ≤

|VIN – VOUT| ≤ 40V (Note 4)

Tj = 25°C

0.005

0.01

0.03

0.01

0.02

0.04

0.07

%/V

Ripple Rejection

VOUT = –10V, f = 120Hz

CADJ = 0

CADJ = 10μF

Thermal Regulation

Tj = 25°C, 10ms Pulse

0.002

0.02

0.003

0.04

%/W

IADJ

Adjust Pin Current

100

μA

ΔIADJ

Adjust Pin Current Change

10mA ≤ IOUT ≤ IMAX

3V ≤

|VIN – VOUT| ≤ 40V

0.2

0.5

μA

Minimum Load Current

|VIN – VOUT| ≤ 40V

|VIN – VOUT| ≤ 10V

2.5

1.2

2.5

ISC

Current Limit

|VIN – VOUT| ≤ 15V,

K, M and T Package

H Package

|VIN – VOUT| = 40V,

K, M and T Package

Tj = 25°C

H Package

1.5

0.5

0.24

0.15

2.2

0.8

0.5

0.25

1.5

0.5

0.15

0.1

2.2

0.8

0.4

0.17

ΔVOUT

ΔTemp

Temperature Stability of

Output Voltage (Note 6)

0.6

1.5

0.6

ΔVOUT

ΔTime

Long Term Stability

TA = 125°C, 1000 Hours

0.3

RMS Output Noise

(% of VOUT)

TA = 25°C, 10Hz ≤ f ≤ 10kHz

0.003

θJC

Thermal Resistance Junction

to Case

H Package

K Package

M and T Package

2.3

°C/W

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The shaded electrical speciﬁcations indicate those parameters

which have been improved or guaranteed test limits provided for the ﬁrst

time.

Note 3: Unless otherwise indicated, these speciﬁcations apply:

|VIN

– VOUT| = 5V; and IOUT = 0.1A for the H package, IOUT = 0.5A for the K, M,

and T packages. Power dissipation is internally limited. However, these

speciﬁcations apply for power dissipation up to 2W for the H package and

20W for the K and T packages. IMAX = 1.5A for the K, M, and T packages,

and 0.2A for the H package.

Note 4: Testing is done using a pulsed low duty cycle technique. See

thermal regulation speciﬁcations for output changes due to heating effects.

Load regulation is measured on the output pin at a point 1/8" below the

base of the K and H package and at the junction of the wide and narrow

portion of the lead on the M and T package.

Note 5: Load regulation for the LT337AT is the same as for LM337T.

Note 6: Guaranteed on LT137A and LT337A, but not 100% tested in

production.

Note 7: ISC is tested at the ambient temperatures of 25°C and –55°C. ISC

cannot be tested at the maximum ambient temperature of 150°C due to the

high power level required. ISC speciﬁcation at 150°C ambient is guaranteed

by characterization and correlation to 25°C testing.

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