
LT3597
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 = 24V, BOOST = 29V, BIAS = 5V, EN/UVLO = 5V, PWM1-3 = 3.3V,
CTRL1-3 = CTRLM = T SET = 2.0V, V OUT1-3 = 24V , SYNC = 0V, unless otherwise specified. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V IN Operating Voltage
Quiescent Current from V IN
Minimum BIAS Voltage
Quiescent Current from BIAS
EN Threshold (Falling)
EN/UVLO = 0.4V
BIAS = 5V, Not Switching
BIAS = 0V, Not Switching
EN/UVLO = 0.4V
BIAS = 5V, Not Switching
BIAS = 0V, Not Switching, Current Out of Pin
l
6
0.4
2.1
4
3
2
60
0.7
55
2
4
6
3.1
2
3
150
V
μA
mA
mA
V
μA
mA
μA
V
UVLO Threshold (Falling)
1.47
1.51
1.53
V
EN/UVLO Pin Current (Hysteresis)
FB1-3 Regulation Voltage
FB1-3 Pin Bias Current
Maximum Duty Cycle
Switch Saturation Voltage
Switch Current Limit
DA Pin Current to Stop OSC
EN/UVLO = 1.6V
EN/UVLO = 1.4V
FB = 6V
R T = 220k (200kHz)
R T = 33.2k (1MHz)
I SW1-3 = 100mA
4
1.15
90
78
400
225
10
5.1
1.22
95
85
265
510
280
6
1.25
200
700
350
nA
μA
V
nA
%
%
mV
mA
mA
Switch Leakage
BST1-3 Pin Current
V SW1-3 = 0V
I SW1-3 = 100mA
2
700
nA
mA
Switching Frequency
R T = 220k
R T = 33.2k
170
900
200
1000
230
1100
kHz
kHz
SYNC Input Low
SYNC Input High
1.6
0.4
V
V
SYNC Frequency Range
SYNC Pin Bias Current
Soft-Start Time
R T = 220k
R T = 47k
V SYNC = 3.3V
(Note 4)
240
2.5
1000
200
kHz
kHz
nA
ms
V REF Voltage
I VREF = 0μA
l
1.96
2.0
2.04
V
Maximum V REF Current
200
μA
I SET1-3 Pin Voltage
T SET Voltage for LED Current Derating
T SET Pin Leakage Current
R ISET1-3 = 20k, V CTRL = V CTRLM = T SET = 1.5V
V TSET = 1.0V
1.0
540
200
V
mV
nA
I LED1-3 LED Current
R ISET1-3 = 20k
l
98
97
100
100
102
103
mA
mA
3597fa
3