LT1249

3

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

of a device may be impaired.

Note 2: Current amplifier is in linear mode with 0V input common mode.

Note 3: Multiplier Gain Constant: K =

Note 4: Maximum GTDR output voltage is internally clamped for higher

FREQUENCY (Hz)

10

100

80

60

40

20

0

–20

100

1k

10k

100k

1249 G01

1M

10M

0

–20

–40

–60

–80

–100

–120

PHASE

GAIN

Voltage Amplifier Open-Loop

Gain and Phase

FREQUENCY (Hz)

1k

400

350

300

250

200

150

100

50

0

20

0

–20

–40

–60

–80

–100

–120

–140

100k

10k

1249 G02

1M

10M

θ

Transconductance of

Current Amplifier

2

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reference

Reference Output Voltage

7.39

7.5

7.6

V

Reference Output Voltage Worst Case

All Line, Temperature

q

7.32

7.5

7.68

V

Reference Output Voltage Line Regulation

q

–20

5

20

mV

Multiplier

Multiplier Output Current

35

µA

Multiplier Output Current Offset

q

– 0.05

– 0.5

µA

q

– 375

– 250

– 150

µA

q

– 1.25

– 1.1

– 0.96

V

Multiplier Gain Constant (Note 3)

0.035

15

32

50

k

Ω

Oscillator

Oscillator Frequency

q

75

100

125

kHz

Duty Cycle = 0

q

1.3

1.8

2.3

V

Synchronization Frequency Range

Synchronizing Pulse Low

q

127

160

kHz

Gate Driver

Max GTDR Output Voltage

q

12

15

17.5

V

GTDR Output High

– 200mA Load, 11.5V

q

V

GTDR Output Low (Device Unpowered)

q

0.9

1.5

V

GTDR Output Low (Device Active)

200mA Load (Sinking)

q

0.5

1

V

Peak GTDR Current

10nF from GTDR to GND

2

A

GTDR Rise and Fall Time

1nF from GTDR to GND

25

ns

GTDR Max Duty Cycle

90

96

%