LT3517HFE-PBF Ver la hoja de datos (PDF) - Linear Technology
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LT3517HFE-PBF Datasheet PDF : 20 Pages
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LT3517
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2) VIN = 5V, SHDN = 5V, PWM = 5V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Minimum VIN Operating Voltage
Maximum VIN Operating Voltage
Continuous Operation (Note 3)
3
V
30
V
Current Sense Voltage (VISP – VISN)
10% Scale Current Sense Voltage (VISP – VISN)
VCTRL = 2V, VISP = 24V, VC = 1V
VCTRL = 2V, VISP = 0V, VC = 1V
VCTRL = 100mV, VISP = 24V, VC = 1V
● 96
100
103
mV
100
mV
9
mV
Current Sense Voltage Line Regulation
VIN Supply Current
2V < VISP < 45V
PWM > 1.5V, VC = 0V
PWM = 0V
SHDN = 0V
0.03
%/V
6
10
mA
4.5
mA
0.1
1
µA
Switching Frequency
RT Voltage
RT = 16.7k
RT = 4.03k
RT = 91.5k
l 0.85
1
1.15
MHz
2.25
2.5
2.7
MHz
220
250
270
kHz
1
V
Soft-Start Pin Current
SS = 0.5V, Out of Pin
6
9
12
µA
SYNC Pull-Down Current (Into the Pin)
SYNC Input Low
VSYNC = 2V
60
µA
0.4
V
SYNC Input High
1.5
V
Maximum Duty Cycle
Switch Current Limit
RT = 91.5k (250kHz)
SYNC = 300kHz Clock Signal, RT = 91.5k
RT = 16.7k (1MHz)
RT = 4.03k (2.5MHz)
95
97
%
94
96
%
l 85
90
%
74
%
1.5
1.9
2.3
A
Switch VCESAT
ISW = 1A
300
mV
Switch Leakage Current
VSW = 45V, PWM = 0V
2
µA
CTRL Input Bias Current
Error Amplifier Transconductance
Current Out of Pin, VCTRL = 0.1V
20
100
nA
550
µS
VC Output Impedance
1000
kΩ
VC Idle Input Bias Current
PWM = 0V, VC = 1V
–20
0
20
nA
FB Pin Input Bias Current
Current Out of Pin, VFB = 0.5V
20
100
nA
FB Pin Threshold
l 0.98 1.01 1.04
V
ISP , ISN Idle Input Bias Current
ISP , ISN Full-Scale Input Bias Current
PWM = 0V, ISP = ISN = 24V
ISP Tied to ISN, VISP = 24V, VCTRL = 2V
300
nA
20
µA
SHDN Voltage High
l 1.2
V
SHDN Voltage Low
SHDN Pin Bias Current
–40°C ≤ TJ ≤ 125°C
125°C < TJ ≤ 150°C
0.45
V
0.40
V
60
100
µA
PWM Input High Voltage
l 1.2
V
PWM Input Low Voltage
PWM Pin Bias Current
–40°C ≤ TJ ≤ 125°C
125°C < TJ ≤ 150°C
0.45
V
0.40
V
60
120
µA
For more information www.linear.com/LT3517
3517fg
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