Datasheet

LT3760
3
3760fc
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
INPUT BIAS, REFERENCE
Minimum Operational V
IN
(To Allow GATE Switching) V
C
= 1.5V
V
IN
= INTV
CC
(Shorted)
V
IN
≠ INTV
CC
l
l
4.2
5.5
4.5
6.0
V
V
Operational V
IN
V
IN
= INTV
CC
(Shorted)
V
IN
≠ INTV
CC
4.5
6
13
40
V
V
V
IN
Quiescent Current CTRL = 0.1V, PWM = 0V
CTRL = 0.1V, PWM = 1.5V, (Not Switching)
LED
1–8
= 1.2V
4.2
9.5
5.7
12
mA
mA
V
IN
Shutdown Current (V
IN
≠ INTV
CC
) (Not Shorted) SHDN/UVLO = 0V, V
IN
=6V
SHDN/UVLO = 0V, V
IN
= 40V
0.1 2
10
µA
µA
V
IN
Shutdown Current (V
IN
= INTV
CC
(Shorted)) SHDN/UVLO = 0V, V
IN
= INTV
CC
= 4.5V
SHDN/UVLO = 0V, V
IN
= INTV
CC
= 13V
10
20
20
40
µA
µA
SHDN/UVLO Threshold (Micropower) (Falling) (V
SD
) I
VIN
< 20µA
l
0.3 0.7 V
SHDN/UVLO Threshold (UVLO) (Falling)
(Stop Switching) (V
UV
)
l
1.414 1.476 1.538 V
SHDN/UVLO Pin Current SHDN/UVLO = V
UV
- 50mV
SHDN/UVLO = V
UV
+ 50mV
l
1.6 2.4
0
3.2 µA
µA
V
REF
Voltage I
VREF
= 0µA
l
1.450 1.485 1.524 V
V
REF
Line Regulation I
VREF
= 0µA, 6V < V
IN
< 40V 0.01 0.05 %/V
V
REF
Load Regulation 0 < I
VREF
< 150µA (Max) 2 mV
OSCILLATOR
Frequency: f
OSC
(100kHz) RT = 523k
l
92 101 112 kHz
Frequency: f
OSC
(1MHz) RT = 39.2k
l
0.90 1 1.10 MHz
f
OSC
(1MHz) Line Regulation RT = 39.2k, 6V < V
IN
< 40V 0.1 0.2 %/V
RT Pin Voltage RT = 39.2k 1.6 V
Minimum Off-Time
Minimum On-Time
(Note 5)
(Note 5)
170
190
250
250
nS
nS
SYNC Input High Threshold 2.2 V
SYNC Input Low Threshold 0.6 V
SYNC Input Current SYNC = 0V
SYNC = 5V
0
25
µA
µA
SYNC Frequency Range RT = 523k
RT = 39.2k
0.12
1.2
1.5
1.5
MHz
MHz
LINEAR REGULATOR (INTV
CC
)
INTV
CC
Regulation Voltage V
IN
= 12V 6.65 7 7.35 V
Dropout (V
IN
- INTV
CC
)
I
INTVCC
= 10mA 250 mV
INTV
CC
UVLO (+)
(Start Switching) 3.8 V
INTV
CC
UVLO (-)
(Stop Switching) 3.4 V
INTV
CC
Current Limit
l
40 57 mA
OVP/LED ERROR AMPLIFIERS
Transconductance (OVP) ∆I
VC
= ±2.5µA 4 µmhos
Voltage Gain (OVP) 5 V/V
Transconductance (LED) ∆I
VC
= ±2.5µA 33 µmhos
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= V
OUT
= 6V, R
ISET
= 14.7k unless otherwise noted.