Datasheet

3
LT1425
ELECTRICAL CHARACTERISTICS
V
IN
= 5V, T
J
= 25°C, V
SW
Open, V
C
= 1.4V, unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Load Compensation
V
RCCOMP
/I
SW
0.45
SYNC Function
Minimum SYNC Amplitude 1.5 2.2 V
Synchronization Range 320 450 kHz
SYNC Pin Input Resistance 40 k
Power Supply
V
IN(MIN)
Minimum Input Voltage 2.8 3.1 V
I
CC
Supply Current 7.0 9.5 mA
Shutdown Mode Supply Current 15 40 µA
Shutdown Mode Threshold 0.4 0.9 1.3 V
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Switch Saturation Voltage vs
Switch Current
TEMPERATURE (°C)
–50
3.1
3.0
2.9
2.8
2.7
2.6
2.5
2.4
25 75
1425 G03
–25 0
50 100 125
INPUT VOLTAGE (V)
Switch Current Limit vs
Duty Cycle
Minimum Input Voltage vs
Temperature
SWITCH CURRENT (A)
0
SWITCH SATURATION VOLTAGE (V)
1.2
1.0
0.8
0.6
0.4
0.2
0
0.6 1.0
1425 G01
0.2 0.4
0.8 1.2 1.4
125°C
25°C
–55°C
DUTY CYCLE (%)
0
SWITCH CURRENT LIMIT (A)
40
1425 G02
10
20
30
50 60 70 80 90 100
2.0
1.5
1.0
0.5
0
T
A
= 25°C
The denotes the specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: Feedback amplifier transconductance is R
REF
referred.
Note 3: Voltage gain is R
REF
referred.