LT3517
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum V
IN
Operating Voltage
Maximum V
IN
Operating Voltage
Current Sense Voltage (V
ISP
– V
ISN
)
10% Scale Current Sense Voltage (V
ISP
– V
ISN
)
Current Sense Voltage Line Regulation
V
IN
Supply Current
Continuous Operation (Note 3)
V
CTRL
= 2V, V
ISP
= 24V, V
C
= 1V
V
CTRL
= 2V, V
ISP
= 0V, V
C
= 1V
V
CTRL
= 100mV, V
ISP
= 24V, V
C
= 1V
2V < V
ISP
< 45V
PWM > 1.5V, V
C
= 0V
PWM = 0V
SHDN
= 0V
R
T
= 16.7k
R
T
= 4.03k
R
T
= 91.5k
SS = 0.5V, Out of Pin
V
SYNC
= 2V
1.5
R
T
= 91.5k (250kHz)
SYNC = 300kHz Clock Signal, R
T
= 91.5k
R
T
= 16.7k (1MHz)
R
T
= 4.03k (2.5MHz)
I
SW
= 1A
V
SW
= 45V, PWM = 0V
Current Out of Pin, V
CTRL
= 0.1V
20
550
1000
PWM = 0V, V
C
= 1V
Current Out of Pin, V
FB
= 0.5V
●
●
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2) V
IN
= 5V,
SHDN
= 5V, PWM = 5V unless otherwise noted.
CONDITIONS
MIN
30
96
100
100
9
0.03
6
4.5
0.1
0.85
2.25
220
6
1.0
2.5
250
1
9
60
0.4
95
94
85
1.5
97
96
90
74
1.9
300
2
100
2.3
12
10
1
1.15
2.7
270
103
TYP
MAX
3
UNITS
V
V
mV
mV
mV
%/V
mA
mA
μA
MHz
MHz
kHz
V
μA
μA
V
V
%
%
%
%
A
mV
μA
nA
μS
kΩ
20
100
1.04
300
20
1.5
0.4
60
1.5
0.4
60
120
100
nA
nA
V
nA
μA
V
V
μA
V
V
μA
Switching Frequency
R
T
Voltage
Soft-Start Pin Current
SYNC Pull-Down Current (Into the Pin)
SYNC Input Low
SYNC Input High
Maximum Duty Cycle
●
Switch Current Limit
Switch V
CESAT
Switch Leakage Current
CTRL Input Bias Current
Error Amplifier Transconductance
V
C
Output Impedance
V
C
Idle Input Bias Current
FB Pin Input Bias Current
FB Pin Threshold
ISP , ISN Idle Input Bias Current
ISP , ISN Full-Scale Input Bias Current
SHDN
Voltage High
SHDN
Voltage Low
SHDN
Pin Bias Current
PWM Input High Voltage
PWM Input Low Voltage
PWM Pin Bias Current
PWM = 0V
ISP Tied to ISN, V
ISP
= 24V, V
CTRL
= 2V
–20
0.98
0
20
1.01
3517fa
3
LINER [ LINEAR TECHNOLOGY ]
