LT1033_02 Datasheet, PDF (7/12 Pages) Linear Technology – 3A Negative Adjustable Regulator

LT1033
TYPICAL APPLICATIO S
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
be improved by V_OUT/1.25V compared to a standard
regulator, so regulator #1 should be the one which has the
lowest load current.
Multiple Tracking Regulators
C3
10µF
R2
2µF
C1
2µF
1N4002
R1
SOLID
ADJ
120Ω
TANTALUM
–V_IN
V_{IN REG #1} V_OUT
–V_OUT1
LT1033
2µF
ADJ
V_{IN REG #2} V_OUT
LT1033
1N4002
2µF
SOLID
TANTALUM
–V_OUT2
High Stability Regulator
ADJ
–V_IN
V_IN
V_OUT
LT1033
7V
R2*
LM329B
R3
R1
1.5k
1k
1%
1%
1µF
SOLID
TANTALUM
|V_OUT|
*R2 =
9.08 • 10^–3
–V_OUT
– 908Ω
LT1033 • TA06
Dual Tracking 3A Supply ± 1.25V to ± 20V
LT150A
+V_IN
V_IN
V_OUT
ADJ
+
R2
10µF
5k
1%
+
R4
10µF
5k
1%
ADJ
–V_IN
V_IN
V_OUT
LT1033
R1**
100Ω ₊
1%
2.2µF*
R3
5k
R5** ⁺
100Ω
1%
2.2µF*
*SOLID TANTALUM
**R1 OR R5 MAY BE TRIMMED SLIGHTLY TO IMPROVE TRACKING
+V_OUT
D1
1N4002
D2
1N4002
–V_OUT
LT1033 • TA07
2µF
ADJ
V_{IN REG #N} V_OUT
LT1033
2µF
SOLID
TANTALUM
–V_OUT3
LT1033 • TA05
Current Regulator
ADJ
(–)
V_IN
V_OUT
LT1033
+ C1
2µF
SOLID TANTALUM
R_S
(+)
I
(O.5Ω ≤ R_S ≤ 250Ω)
I = 65µA + ^1.25V
R_S
LT1033 • TA08
1033fc
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