Datasheet

LT3758/LT3758A
3
3758afd
electricAl chArActeristics
The l denotes the specifications which apply over the full operating temp-
erature range, otherwise specifications are at T
A
= 25°C. V
IN
= 24V, SHDN/UVLO = 24V, SENSE = 0V, unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Range 5.5 100 V
V
IN
Shutdown I
Q
SHDN/UVLO = 0V
SHDN/UVLO = 1.15V
0.1 1
6
µA
µA
V
IN
Operating I
Q
V
C
= 0.3V, R
T
= 41.2k 1.75 2.2 mA
V
IN
Operating I
Q
with Internal LDO Disabled V
C
= 0.3V, R
T
= 41.2k, INTV
CC
= 7.5V 350 400 µA
SENSE Current Limit Threshold
l
100 110 120 mV
SENSE Input Bias Current Current Out of Pin –65 µA
Error Amplifier
FBX Regulation Voltage (V
FBX(REG)
) FBX > 0V (Note 3)
FBX < 0V (Note 3)
l
l
1.569
–0.816
1.6
–0.800
1.631
–0.784
V
V
FBX Overvoltage Lockout FBX > 0V (Note 4)
FBX < 0V (Note 4)
6
7
8
11
10
14
%
%
FBX Pin Input Current FBX = 1.6V (Note 3)
FBX = –0.8V (Note 3) –10
70 100
10
nA
nA
Transconductance g
m
(∆I
VC
/∆FBX) (Note 3) 230 µS
V
C
Output Impedance (Note 3) 5 MΩ
V
FBX
Line Regulation (∆V
FBX
/[∆V
IN
• V
FBX(REG)
]) FBX > 0V, 5.5V < V
IN
< 100V (Notes 3, 6)
FBX < 0V, 5.5V < V
IN
< 100V (Notes 3, 6)
0.006
0.005
0.025
0.03
%/V
%/V
V
C
Current Mode Gain (∆V
VC
/∆V
SENSE
) 5.5 V/V
V
C
Source Current V
C
= 1.5V –15 µA
V
C
Sink Current FBX = 1.7V
FBX = –0.85V
12
11
µA
µA
Oscillator
Switching Frequency R
T
= 41.2k to GND, FBX = 1.6V
R
T
= 140k to GND, FBX = 1.6V
R
T
= 10.5k to GND, FBX = 1.6V
270 300
100
1000
330 kHz
kHz
kHz
RT Voltage FBX = 1.6V 1.2 V
Minimum Off-Time 220 ns
Minimum On-Time 220 ns
SYNC Input Low 0.4
SYNC Input High 1.5
SS Pull-Up Current SS = 0V, Current Out of Pin –10 µA
Low Dropout Regulator
INTV
CC
Regulation Voltage
l
7 7.2 7.4 V
INTV
CC
Undervoltage Lockout Threshold Falling INTV
CC
UVLO Hysteresis
4.3 4.5
0.5
4.7 V
V
INTV
CC
Overvoltage Lockout Threshold 17.5 V
INTV
CC
Current Limit V
IN
= 100V
V
IN
= 20V
11 16
50
22 mA
mA
INTV
CC
Load Regulation (∆V
INTVCC
/ V
INTVCC
) 0 < I
INTVCC
< 10mA, V
IN
= 8V –1 –0.4 %
INTV
CC
Line Regulation (∆V
INTVCC
/ [∆V
IN
• V
INTVCC
]) 8V < V
IN
< 100V 0.005 0.02 %/V
Dropout Voltage (V
IN
– V
INTVCC
) V
IN
= 6V, I
INTVCC
= 10mA 500 mV
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