Document Number 2831

Issue 3

IP137A SERIES

IP337A SERIES

LM137A SERIES

Semelab Plc reserves the right to change test conditions, parameter limits and package dimensions without notice. Information furnished by Semelab is believed

to be both accurate and reliable at the time of going to press. However Semelab assumes no responsibility for any errors or omissions discovered in its use.

Semelab encourages customers to verify that datasheets are current before placing orders.

R3

1. 5k

1%

AD J

IP337A

V

IN

V

OU T

R1

1k

1%

R2

1

µF

SO LID

TA NT A LUM

7V

*

* R2 =

(

)

– 908

Ω

C3

10

µF

R2

AD J

IP137A

V

IN

V

OU T

1N4 0 02

R1

120

Ω

AD J

IP137A

1N4 0 02

2

µF

C1

1

µF

SO LID

TANTA LUM

REG #1

2

REG #2

1

µF

SO LID

TA NTA LU M

OUT2

–V

AD J

IP 137A

V

IN

V

OU T

1N4 0 02

2

µF

REG #N

1

µF

SO LID

TA NTA LU M

OUT N

–V

AD J

IP3 37A

D2

1N 40 02

IN

–V

R5* *

100

Ω

1%

R3

5k

10

µF

V

IN

V

OU T

AD J

IP3 17A

R1* *

100

Ω

1%

10

µF

2. 2

µF

2. 2

µF

D1

1N 40 02

IN

+V

+V

OUT

R2

5k

1%

R4

5k

1%

AD J

(–)

I

(+)

C1

1

µF

SO LID

TA NA TALU M

IP 337A

0.8

Ω ≤

≤ 250Ω

I = 65

µA + 1.25 V

Current Regulator

Dual Tracking Supply

APPLICATIONS INFORMATION

High Stability Regulator

The output stability, load regulation, line regulation, thermal

regulation, temperature drift, long term drift, and noise, can be

improved by a factor of 6.6 over the standard regulator

configuration. This assumes a zener has 20PPM/°C maximum

drift and about 10 times lower noise than the regulator.

Multiple Tracking Regulators

In the application shown below, regulator #2 to “N” will track

regulator #1 to within ±24mV initially, and to ±60mV over all load,

line, and temperature conditions.

If any regulator output is shorted to ground, all other

outputs will drop to -2V. Load regulation of regulators 2 to “N” will

so regulator #1 should be the one which has the lowest load

current.

* Solid Tantalum

** R1 or R5 may be trimmed slightly to improve tracking.

IG–Pack

Part

G–Pack

K–Pack R–Pack T–Pack

Temp.

Number

(TO257) SMD1

SMD05 LCC4

(TO3)

(TO66)

(TO220)

Range

LM137

-55 to +150°C

LM137HV

”

LM137A

”

LM137AHV

”

IP137

“

IP137HV

”

IP137A

”

IP137AHV

”

LM337

0 to 125°C

LM337HV

”

IP337

”

IP337HV

”

IP337A

”

IP337AHV

”

Order Information