Datasheet

LT3519/LT3519-1/LT3519-2
3
3519fa
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 LT3519E/LT3519E-1/LT3519E-2 are guaranteed to meet
specifi ed performance from 0°C to 125°C junction temperature range.
Specifi cations over the –40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with
The l denotes the specifi cations which apply over the full
operating temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 12V, SHDN/UVLO = 12V, CTRL = 2V, PWM = 5V,
unless otherwise noted.
statistical process controls. The LT3519I/LT3519I-1/LT3519I-2 are
guaranteed to meet performance specifi cations over the –40°C to 125°C
operating junction temperature range.
Note 3. Absolute maximum voltage at V
IN
and OPENLED is 40V for
nonrepetitive one second transients and 30V for continuous operation.
Note 4. For V
IN
below 6V, the SHDN/UVLO pin must not exceed V
IN
for
proper operation.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Switching Frequency 400kHz (LT3519)
1MHz (LT3519-1)
2.2MHz (LT3519-2)
l
l
l
320
0.80
1.9
400
1
2.2
440
1.10
2.4
kHz
MHz
MHz
Maximum Duty Cycle 400kHz (LT3519)
1MHz (LT3519-1)
2.2MHz (LT3519-2)
l
l
l
94
86
72
97
93
83
%
%
%
Switch Current Limit
l
750 980 1150 mA
Switch V
CESAT
I
SW
= 500mA 300 mV
Switch Leakage Current SW = 45V, PWM = 0V 2 μA
CTRL for Full-Scale LED Current 1.2 V
CTRL Pin Bias Current Current Out of Pin, CTRL = 0.1V 50 100 nA
PWM Input High Voltage
l
1.5 V
PWM Input Low Voltage
l
0.8 V
PWM Pin Resistance to GND 70 kΩ
FB Regulation Voltage (V
FB
)
l
1.190 1.220 1.250 V
FB Pin Threshold Voltage for OPENLED Falling V
FB
– 70mV V
FB
– 60mV V
FB
– 50mV V
FB Pin Bias Current Current Out of Pin, FB = 1V 60 120 nA
ISP
, ISN Idle Input Bias Current PWM = 0V, ISP = ISN = 24V 1 μA
ISP
, ISN Active Input Bias Current ISP = ISN = 24V, Current per Pin 17 μA
Schottky Forward Drop I
SCHOTTKY
= 500mA 0.8 V
Schottky Leakage Current CATHODE = 24V, ANODE = 0V 4 μA
SHDN/UVLO Threshold Voltage Falling
l
1.180 1.220 1.270 V
SHDN/UVLO Input Low Voltage I
VIN
Drops Below 1μA 0.4 V
SHDN/UVLO Pin Bias Current Low SHDN/UVLO = 1.15V 1.8 2.2 2.6 μA
SHDN/UVLO Pin Bias Current High SHDN/UVLO = 1.30V 10 100 nA
V
REF
Output Voltage –100μA ≤ I
VREF
≤ 0μA
l
1.96 2 2.04 V
V
REF
Output Pin Regulation 3V < V
IN
< 40V 0.04 %/V
OPENLED Output Low (V
OL
)I
OPENLED
= 1mA 240 mV
OPENLED Leakage Current FB = 0V, OPENLED = 40V 1 μA