3

LT1683

1683f

other pins open unless otherwise noted.

Oscillator and Sync

Max Switch Frequency

250

kHz

Synchronization Frequency Range

Oscillator Frequency = 250kHz

290

kHz

SYNC Pin Input Threshold

q

0.7

1.4

2.0

SYNC Pin Input Resistance

40

k

Ω

Gate Drives (Specifications Apply to Either A or B Unless Otherwise Noted)

Maximum Switch Duty Cycle

q

45

46

%

Osc Frequency = 25kHz

Gate On Voltage

10

10.4

10.7

V

7.6

7.9

8.1

V

Gate Off Voltage

0.2

0.35

V

Max Gate Source Current

0.3

A

Max Gate Sink Current

0.3

A

Gate Drive Undervoltage Lockout (Note 5)

7.3

7.5

V

Current Sense

Switch Current Limit Blanking Time

100

ns

Sense Voltage Shutdown Voltage

q

86

103

120

mV

Sense Voltage Fault Threshold

q

230

300

mV

Slew Control (for the Following Slew Tests See Test Circuit in Figure 1b)

Output Voltage Slew Rising Edge

26

V/

µs

Output Voltage Slew Falling Edge

19

V/

µs

Output Current Slew Rising Edge (CS Pin Voltage)

2.1

V/

µs

Output Current Slew Falling Edge (CS Pin Voltage)

2.1

V/

µs

Supply and Protection

Minimum Input Voltage (Note 4)

q

2.55

3.6

V

Supply Current (Note 2)

q

25

45

mA

q

35

55

mA

Shutdown Turn-On Threshold

q

1.31

1.39

1.48

V

Shutdown Turn-On Voltage Hysteresis

q

50

110

180

mV

Shutdown Input Current Hysteresis

q

10

24

35

µA

V5

5V Reference Voltage

6.5V

4.85

5

5.20

V

6.5V

4.80

5

5.15

V

5V Reference Short-Circuit Current

10

mA

–10

mA

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

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

life of a device may be impaired.

Note 2: Supply current specification includes loads on each gate as in

Figure 1a. Actual supply currents vary with operating frequency, operating

voltages, V5 load, slew rates and type of external FET.

Note 3: The LT1683E is guaranteed to meet performance specifications

from 0

°C to 70°C. Specifications over the –40°C to 125°C operating range

are assured by design, characterization and correlation with statistical

process controls. The LT1683I is guaranteed and tested over the – 40

° to

125

° operating temperature range.

Note 4: Output gate drivers will be enabled at this voltage. The GCL

voltage will also determine drivers’ activity.

maximum value.