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
Ω
SYNC Function
Minimum SYNC Amplitude
●
1.5
2.2
V
Synchronization Range
320
450
kHz
SYNC Pin Input Resistance
40
k
Ω
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
µ
A
Shutdown Mode Threshold
●
0.4
0.9
1.3
V
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
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.