Datasheet
LT3486
3
3486fe
ELECTRICAL CHARACTERISTICS
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
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 2.5 V
Maximum Operating Voltage 24 V
Feedback Voltage (FB1, FB2)
l
194 200 206 mV
Offset between FB1 and FB2 V
OS
= |FB1-FB2| 0 3 6 mV
Feedback Pin Bias Current (FB1, FB2) V
FB1
= V
FB2
= 0.2V (Note 3) 10 45 100 nA
Quiescent Current V
FB1
= V
FB2
= 1V
SHDN = 0V, CTRL1 = CTRL2 = 0V
9
0.1
14
1
mA
µA
Switching Frequency R
T
= 53.6k
R
T
= 20.5k
l
0.75
1.7
1
2.2
1.25
2.7
MHz
MHz
Oscillator Frequency Range (Typical Value) (Note 4) 200 2500 kHz
Nominal R
T
Pin Voltage R
T
= 53.6k 0.54 V
Maximum Duty Cycle R
T
= 53.6k
R
T
= 20.5k
R
T
= 309k
l
90 96
90
98
%
%
%
Switch Current Limit (SW1, SW2) 1 1.3 1.6 A
Switch V
CESAT
I
SW1
= I
SW2
= 0.75A 300 mV
Switch Leakage Current V
SW1
= V
SW2
= 10V 0.1 5 µA
Error Amplifier Transconductance ∆I = ±5µA 220 µA/V
Error Amplifier Voltage Gain 120
V
C1
, V
C2
Switching Threshold 0.85 V
V
C1
, V
C2
Clamp Voltage 1.5 V
V
C1
, V
C2
Source Current V
FB1
= V
FB2
= 0V 25 µA
V
C1
, V
C2
Sink Current V
FB1
= V
FB2
= 1V 25 µA
V
C1
, V
C2
Pin Leakage Current V
C1
= V
C2
= 1V, V
PWM1
= V
PWM2
= 0V 1 10 nA
OVP1, OVP2 Overvoltage Threshold Voltage 34 35 36 V
CTRL1, CTRL2 Voltages to Turn Off LED1, 2 Currents
l
75 mV
CTRL1, CTRL2 Voltages to Turn On LED1, 2 Currents 150 mV
CTRL1, CTRL2 Voltages for Full LED1, 2 Currents 1.8 V
CTRL1, CTRL2 Pin Bias Current V
CTRL1
= V
CTRL2
= 3V
l
20 30 40 µA
PWM1, PWM2 Voltage High
l
0.9 V
PWM1, PWM2 Voltage Low
l
0.4 V
PWM1, PWM2 Pin Bias Current V
PWM1
= V
PWM2
= 3V 0.1 1 µA
SHDN Voltage High 1.6 V
SHDN Voltage Low 0.4 V
SHDN Pin Bias Current V
SHDN
= 3V 20 µA
REF Voltage I
REF
= 10µA 1.2 1.25 1.3 V
REF Source Current
l
50 80 µA
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.
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.