Datasheet
LT1683
4
1683fd
Feedback Voltage and Input
Current vs Temperature
Negative Feedback Voltage and
Input Current vs Temperature
Feedback Overvoltage Shutdown
vs Temperature
Error Amp Transconductance
vs Temperature
Error Amp Output Current vs
Feedback Pin Voltage from Nominal
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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.
Note 5: Gate drivers are ensured to be on when V
IN
is greater than the
maximum value.
TYPICAL PERFORMANCE CHARACTERISTICS
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
FEEDBACK VOLTAGE (V)
1683 G01
1.260
1.258
1.256
1.254
1.252
1.250
1.248
1.246
1.244
1.242
1.240
FB INPUT CURRENT (nA)
750
700
650
600
550
500
450
400
350
300
250
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
NEGATIVE FEEDBACK VOLTAGE (V)
1683 G02
2.480
2.485
2.490
2.495
2.500
2.505
2.510
2.515
2.520
NFB INPUT CURRENT (µA)
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
FEEDBACK VOLTAGE (V)
1683 G03
1.70
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
TEMPERATURE (°C)
–50 –25 0 25 50 75 100 125 150
TRANSCONDUCTANCE (µmho)
1683 G04
2000
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
FEEDBACK PIN VOLTAGE FROM NOMINAL (mV)
–400 –300 –200 –100 0 100 200 300 400
CURRENT (µA)
1683 G05
500
400
300
200
100
0
–100
–200
–300
–400
–500
–40°C
125°C
25°C