LT3517
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications ar e at T A = 25°C. (Note 2) V IN = 5V, SHDN = 5V, PWM = 5V unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum V IN Operating Voltage
3
V
Maximum V IN Operating Voltage
Continuous Operation (Note 3)
30
V
Current Sense Voltage (V ISP – V ISN )
V CTRL = 2V, V ISP = 24V, VC = 1V
V CTRL = 2V, V ISP = 0V, VC = 1V
96
100
100
103
mV
mV
10% Scale Current Sense Voltage (V ISP – V ISN )
Current Sense Voltage Line Regulation
V CTRL = 100mV, V ISP = 24V, VC = 1V
2V < V ISP < 45V
9
0.03
mV
%/V
V IN Supply Current
PWM > 1.5V, VC = 0V
PWM = 0V
SHDN = 0V
6
4.5
0.1
10
1
mA
mA
μA
Switching Frequency
R T = 16.7k
R T = 4.03k
R T = 91.5k
0.85
2.25
220
1
2.5
250
1.15
2.7
270
MHz
MHz
kHz
RT Voltage
1
V
Soft-Start Pin Current
SYNC Pull-Down Current (Into the Pin)
SS = 0.5V, Out of Pin
V SYNC = 2V
6
9
60
12
μA
μA
SYNC Input Low
SYNC Input High
1.5
0.4
V
V
Maximum Duty Cycle
Switch Current Limit
R T = 91.5k (250kHz)
SYNC = 300kHz Clock Signal, R T = 91.5k
R T = 16.7k (1MHz)
R T = 4.03k (2.5MHz)
95
94
85
1.5
97
96
90
74
1.9
2.3
%
%
%
%
A
Switch V CESAT
Switch Leakage Current
I SW = 1A
V SW = 45V, PWM = 0V
300
2
mV
μA
CTRL Input Bias Current
Error Amplifier Transconductance
VC Output Impedance
Current Out of Pin, V CTRL = 0.1V
20
550
1000
100
nA
μS
VC Idle Input Bias Current
FB Pin Input Bias Current
FB Pin Threshold
PWM = 0V, VC = 1V
Current Out of Pin, V FB = 0.5V
–20
0.98
0
20
1.01
20
100
1.04
nA
nA
V
ISP , ISN Idle Input Bias Current
ISP , ISN Full-Scale Input Bias Current
SHDN Voltage High
SHDN Voltage Low
PWM = 0V, ISP = ISN = 24V
ISP Tied to ISN, V ISP = 24V, V CTRL = 2V
–40°C ≤ T J ≤ 125°C
125°C < T J ≤ 150°C
1.2
20
300
0.45
0.40
nA
μA
V
V
V
SHDN Pin Bias Current
60
100
μA
PWM Input High Voltage
PWM Input Low Voltage
–40°C ≤ T J ≤ 125°C
125°C < T J ≤ 150°C
1.2
0.45
0.40
V
V
V
PWM Pin Bias Current
60
120
μA
3517fg
For more information www.linear.com/LT3517
3
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