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LT3486
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = 3V, V CTRL1 = 3V, V CTRL2 = 3V, V PWM1 = 3V, V PWM2 = 3V,
V SHDN = 3V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Operating Voltage
Maximum Operating Voltage
2.5
24
V
V
Feedback Voltage (FB1, FB2)
Offset between FB1 and FB2
Feedback Pin Bias Current (FB1, FB2)
Quiescent Current
V OS = |FB1-FB2|
V FB1 = V FB2 = 0.2V (Note 3)
V FB1 = V FB2 = 1V
SHDN = 0V, CTRL1 = CTRL2 = 0V
l
194
0
10
200
3
45
9
0.1
206
6
100
14
1
mV
mV
nA
mA
μA
Switching Frequency
Oscillator Frequency Range (Typical Value)
R T = 53.6k
R T = 20.5k
(Note 4)
l
0.75
1.7
200
1
2.2
1.25
2.7
2500
MHz
MHz
kHz
Nominal R T Pin Voltage
R T = 53.6k
0.54
V
Maximum Duty Cycle
Switch Current Limit (SW1, SW2)
Switch V CESAT
Switch Leakage Current
Error Amplifier Transconductance
R T = 53.6k
R T = 20.5k
R T = 309k
I SW1 = I SW2 = 0.75A
V SW1 = V SW2 = 10V
?I = ±5μA
l
90
1
96
90
98
1.3
300
0.1
220
1.6
5
%
%
%
A
mV
μA
μA/V
Error Amplifier Voltage Gain
120
V C1 , V C2 Switching Threshold
V C1 , V C2 Clamp Voltage
0.85
1.5
V
V
V C1 , V C2 Source Current
V C1 , V C2 Sink Current
V FB1 = V FB2 = 0V
V FB1 = V FB2 = 1V
25
25
μA
μA
V C1 , V C2 Pin Leakage Current
OVP1, OVP2 Overvoltage Threshold Voltage
CTRL1, CTRL2 Voltages to Turn Off LED1, 2 Currents
CTRL1, CTRL2 Voltages to Turn On LED1, 2 Currents
CTRL1, CTRL2 Voltages for Full LED1, 2 Currents
V C1 = V C2 = 1V, V PWM1 = V PWM2 = 0V
l
34
150
1.8
1
35
10
36
75
nA
V
mV
mV
V
CTRL1, CTRL2 Pin Bias Current
V CTRL1 = V CTRL2 = 3V
l
20
30
40
μA
PWM1, PWM2 Voltage High
PWM1, PWM2 Voltage Low
l
l
0.9
0.4
V
V
PWM1, PWM2 Pin Bias Current
V PWM1 = V PWM2 = 3V
0.1
1
μA
SHDN Voltage High
SHDN Voltage Low
1.6
0.4
V
V
SHDN Pin Bias Current
V SHDN = 3V
20
μA
REF Voltage
REF Source Current
I REF = 10μA
l
1.2
50
1.25
80
1.3
V
μA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LT3486E is guaranteed to meet specified performance
from 0°C to 85°C and is designed, characterized and expected to meet
these extended temperature limits, but is not tested at –40°C and 85°C.
The LT3486I specifications are guaranteed over the –40°C to 125°C
temperature range.
Note 3: Current flows out of the pin.
Note 4: Guaranteed by design and test correlation, not production tested.
3486fe
3
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