Datasheet

LT3759
3
3759fc
For more information www.linear.com/3759
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Voltage
l
1.6 42 V
V
IN
Shutdown I
Q
EN/UVLO < 0.4V
EN/UVLO = 1.15V
0.1 1
6
µA
µA
V
IN
Operating I
Q
350 450 µA
DRIVE Shutdown Quiescent Current EN/UVLO < 0.4V
EN/UVLO = 1.15V
0.1
0.1
1
2
µA
µA
DRIVE Quiescent Current (Not Switching) R
T
= 27.4kΩ, DRIVE = 6V 2.0 2.5 mA
SENSE Current Limit Threshold
l
46 50 54 mV
SENSE Input Bias Current Current Out of Pin –55 µA
Error Amplifier
FBX Regulation Voltage (V
FBX(REG)
) FBX > 0V
FBX < 0V
l
l
1.580
–0.815
1.6
–0.80
1.620
–0.785
V
V
FBX Pin Input Current FBX = 1.6V
FBX = –0.8V –10
60 120
10
nA
nA
Transconductance g
m
(ΔI
2
/ΔV
FBX
) FBX = V
FBX(REG)
240 µs
VC Output Impedance 5 MΩ
FBX Line Regulation [ΔV
FBX(REG)
/(ΔV
IN
• V
FBX(REG)
)] 1.6V < V
IN
< 42V, FBX >0
1.6V < V
IN
< 42V, FBX <0
0.02
0.02
0.05
0.05
%/V
%/V
VC Current Mode Gain (ΔV
VC
/ΔV
SENSE
) 5 V/V
VC Source Current FBX = 0V, VC = 1.3V –13 µA
VC Sink Current FBX = 1.7V, VC = 1.3V
FBX = –0.85V, VC = 1.3V
13
10
µA
µA
Oscillator
Switching Frequency R
T
= 27.4k to GND, V
FBX
= 1.6V
R
T
= 86.6k to GND, V
FBX
= 1.6V
R
T
= 6.81k to GND, V
FBX
= 1.6V
270 300
100
1000
330 kHz
kHz
kHz
R
T
Voltage FBX = 1.6V, –0.8V 1.2 V
GATE Minimum Off-Time 170 200 ns
GATE Minimum On-Time 170 200 ns
SYNC Input Low
l
0.4 V
SYNC Input High
l
1.5 V
SS Pull-Up Current SS = 0V, Current Out of Pin
l
–14 –10.5 –7 µA
Low Dropout Regulators (DRIVE LDO and V
IN
LDO)
DRIVE LDO Regulation Voltage DRIVE = 6V
l
4.6 4.75 4.9 V
V
IN
LDO Regulation Voltage DRIVE = 0V
l
3.6 3.75 3.9 V
DRIVE LDO Current Limit INTV
CC
= 4V 60 mA
V
IN
LDO Current Limit DRIVE = 0V, INTV
CC
= 3V 60 mA
DRIVE LDO Load Regulation (ΔV
INTVCC
/V
INTVCC
) 0 < I
INTVCC
< 20mA, DRIVE = 6V –1 –0.6 %
V
IN
LDO Load Regulation (ΔV
INTVCC
/V
INTVCC
) DRIVE = 0V, 0 < I
INTVCC
< 20mA –1 –0.6 %
DRIVE LDO Line Regulation [ΔV
INTVCC
/(V
INTVCC
• ΔV
IN
)] 1.6V < V
IN
< 42V, DRIVE = 6V 0.03 0.07 %/V
V
IN
LDO Line Regulation [ΔV
INTVCC
/(V
INTVCC
• ΔV
IN
)] DRIVE = 0V, 5V < V
IN
< 42V 0.03 0.07 %/V
DRIVE LDO Dropout Voltage (V
DRIVE
– V
INTVcc
) DRIVE = 4V, I
INTVCC
= 20mA
l
190 400 mV
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V, EN/UVLO = 12V, INTV
CC
= 4.75V, unless otherwise noted.
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