7

LT1033

1033fc

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 whose drift

and noise is considerably better than the regulator itself.

The LM329B has 20ppm/

°C maximum drift and about 10

times lower noise than the regulator.

In the application shown below, regulators #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

regulator, so regulator #1 should be the one which has the

lowest load current.

Multiple Tracking Regulators

Dual Tracking 3A Supply

± 1.25V to ± 20V

Current Regulator

High Stability Regulator

C1

2

µF

SOLID

TANTALUM

2

µF

2

µF

2

µF

C3

10

µF

R2

R1

120

Ω

1N4002

1N4002

2

µF

SOLID

TANTALUM

2

µF

SOLID

TANTALUM

+

+

+

ADJ

LT1033

REG #1

ADJ

LT1033

REG #2

ADJ

LT1033

REG #N

LT1033 • TA05

+

+

+

+

R2*

R1

1k

1%

R3

1.5k

1%

*R2 =

– 908

Ω

7V

LM329B

1

µF

SOLID

TANTALUM

+

ADJ

LT1033

LT1033 • TA06

R1**

100

Ω

1%

R5**

100

Ω

1%

R2

5k

1%

R4

5k

1%

10

µF

10

µF

R3

5k

2.2

µF*

D1

1N4002

*SOLID TANTALUM

**R1 OR R5 MAY BE TRIMMED SLIGHTLY TO IMPROVE TRACKING

+

2.2

µF*

D2

1N4002

+

+

+

ADJ

LT1033

ADJ

LT150A

LT1033 • TA07

I

(+)

(O.5

I = 65

µA +

(–)

C1

2

µF

SOLID TANTALUM

+

1.25V

ADJ

LT1033

LT1033 • TA08

TYPICAL APPLICATIO S