4

LT1021

ELECTRICAL C

C

HARA TERISTICS

LT1021-10

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Output Voltage (Note 2)

LT1021C-10

9.995

10.00

10.005

V

LT1021B-10/LT1021D-10

9.950

10.00

10.050

V

Output Voltage Temperature Coefficient (Note 3)

LT1021B-10

q

2

5

ppm/

°C

LT1021C-10/LT1021D-10

q

5

20

ppm/

°C

Line Regulation (Note 4)

11.5V

1.0

4

ppm/V

q

6

ppm/V

14.5V

0.5

2

ppm/V

q

4

ppm/V

Load Regulation (Sourcing Current)

0

12

25

ppm/mA

(Note 4)

q

40

ppm/mA

Load Regulation (Shunt Mode)

1.7mA

50

100

ppm/mA

(Notes 4, 5)

q

150

ppm/mA

Supply Current (Series Mode)

1.2

1.7

mA

q

2.0

mA

Minimum Current (Shunt Mode)

1.1

1.5

mA

q

1.7

mA

Output Voltage Noise (Note 6)

0.1Hz

≤ f ≤ 10Hz

6.0

10Hz

≤ f ≤ 1kHz

3.5

6

Long Term Stability of Output Voltage (Note 7)

∆t = 1000Hrs Noncumulative

15

ppm

Temperature Hysteresis of Output

∆T = ±25°C

5

ppm

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: Output voltage is measured immediately after turn-on. Changes

due to chip warm-up are typically less than 0.005%.

Note 3: Temperature coefficient is measured by dividing the change in

output voltage over the temperature range by the change in temperature.

Incremental slope is also measured at 25

°C.

Note 4: Line and load regulation are measured on a pulse basis. Output

changes due to die temperature change must be taken into account

separately. Package thermal resistance is 150

°C/W for TO-5 (H), 130°C/W

for N and 150

°C/W for the SO-8.

Note 5: Shunt mode regulation is measured with the input open. With the

input connected, shunt mode current can be reduced to 0mA. Load

regulation will remain the same.

Note 6: RMS noise is measured with a 2-pole highpass filter at 10Hz and a

2-pole lowpass filter at 1kHz. The resulting output is full-wave rectified and

then integrated for a fixed period, making the final reading an average as

opposed to RMS. Correction factors are used to convert from average to

RMS and correct for the non-ideal bandpass of the filters.

Peak-to-peak noise is measured with a single highpass filter at 0.1Hz and a

2-pole lowpass filter at 10Hz. The unit is enclosed in a still-air environment

to eliminate thermocouple effects on the leads. Test time is 10 seconds.

Note 7: Consult factory for units with long term stability data.