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LT3492
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 5V, SHDN = 5V, PWM1-3 = 5V, FADJ = 0.5V, CTRL1-3 = 1.5V,
OVP1-3 = 0V, unless otherwise noted.
PARAMETER
V IN Operation Voltage
V IN Undervoltage Lockout
CONDITIONS
(Note 4)
MIN
3
TYP
2.1
MAX
30
2.4
UNITS
V
V
Full-Scale LED Current Sense Voltage
One-Tenth Scale LED Current Sense Voltage
ISP1-3 = 48V
CTRL1-3 = 100mV, ISP1-3 = 48V
l
98
96
7
100
10
103
104
13
mV
mV
mV
ISPn/ISNn Operating Voltage
2.5
60
V
V REF Output Voltage
I REF = 200μA, Current Out of Pin
l
1.96
2
2.04
V
V REF Line Regulation
3V ≤ V IN ≤ 40V, I REF = 10μA
0.03
%/V
Quiescent Current in Shutdown
Quiescent Current Idle
Quiescent Current Active (Not Switching)
SHDN = 0V
PWM1-PWM3 = 0V
V C1 -V C3 = 0V
0.1
6
11
10
8
15
μA
mA
mA
Switching Frequency
Maximum Duty Cycle
FADJ = 1.5V
FADJ = 0.5V
FADJ = 0.1V
FADJ = 1.5V (2.1MHz)
FADJ = 0.5V (1.3MHz)
1800
1000
280
73
80
2100
1300
340
78
87
2400
1600
400
kHz
kHz
kHz
%
%
FADJ = 0.1V (330kHz)
97
%
CTRL1-3 Input Bias Current
FADJ Input Bias Current
OVP1-3 Input Bias Current
OVP1-3 Threshold
Current Out of Pin, CTRL1-3 = 0.1V
Current Out of Pin, FADJ = 0.1V
Current Out of Pin, OVP1-3 = 0.1V
0.95
20
20
10
1
100
100
100
1.05
nA
nA
nA
V
V C1-3 Idle Input Bias Current
V C1-3 Output Impedance
EAMP g m ( Δ I VC / Δ V CAP-LED )
SW1-3 Current Limit
PWM1-3 = 0V
ISP1-3 = 48V
ISP1-3 = 48V
(Note 3)
–20
600
0
10
200
1000
20
1300
nA
MΩ
μS
mA
SW1-3 V CESAT
SW1-3 Leakage Current
I SW = 500mA (Note 3)
SHDN = 0V, SW = 5V
340
2
mV
μA
3492fa
3
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