LTZ1000/LTZ1000A

3

1000afc

TYPICAL PERFORMANCE CHARACTERISTICS

Zener Voltage vs Current

Zener Voltage Noise Spectrum

Zener Noise

Die Temperature Rise

vs Heater Power

Die Temperature vs Time

Die Temperature Rise vs Time

PIN FUNCTIONS

Pin 1: Heater Positive. Must have a higher positive value

than Pin 2 and Pin 4.

Pin 2: Heater Negative. Must have a higher positive value

than Pin 4. Must have equal or lower potential than Pin 1.

Pin 3: Zener Positive. Must have a higher positive value

than Pin 4.

Pin 4: Substrate and Zener Negative. Must have a higher

positive value than Pin 7. If Q1 is zenered (about 7V) a

permanent degradation in beta will result.

Pin 5: Temperature Compensating Transistor Collector.

Pin 6: Temperature Sensing Transistor Base. If the base

emitter junction is zenered (about 7V) the transistor will

suffer permanent beta degradation.

Pin 7: Emitter of Sensing and Compensating Transistors.

Pin 8: Collector of Sensing Transistor.

ZENER CURRENT (mA)

0

60

80

70

50

30

100

90

4.0

40

20

10

0

1.0

0.5

2.0

1.5

3.0 3.5

4.5

2.5

5.0

ZENER ALONE

ZENER WITH KELVIN

SENSED Q1

1000 G01

FREQUENCY (Hz)

0.1

200

250

300

350

400

1

10

100

150

100

50

0

450

500

ZENER CURRENT = 0.5mA

ZENER CURRENT = 4mA

1000 G02

TIME (SECONDS)

0

10

20

30

40

50

60

1000 G03

DIE TEMPERATURE ABOVE AMBIENT (°C)

25

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

105

45

65

85

125

95

35

55

75

115

LTZ1000

LTZ1000A

1000 G04

TIME (SECONDS)

125

25

100

75

50

0.1

10

100

1000

0

1

HEATER POWER = 0.1W

HEATER POWER = 0.2W

HEATER POWER = 0.3W

LTZ1000A

1000 G05

TIME (SECONDS)

125

25

100

75

50

0.1

10

100

1000

0

1

HEATER POWER = 0.3W

HEATER POWER = 0.7W

LTZ1000

1000 G06

HEATER POWER = 0.5W