LT3759
4
3759fc
For more information www.linear.com/3759
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
LDO Dropout Voltage (V
IN
– V
INTVcc
) V
IN
= 3V, DRIVE = 0V,
I
INTVCC
= 20mA
l
190 400 mV
INTV
CC
Undervoltage Lockout Threshold Falling 1.3 1.45 V
INTV
CC
Current in Shutdown EN/UVLO = 0V 22 µA
Logic
EN/UVLO Threshold Voltage Falling
l
1.17 1.22 1.27 V
EN/UVLO Rising Hysteresis 20 mV
EN/UVLO Input Low Voltage I
VIN
< 1μA 0.4 V
EN/UVLO Pin Bias Current Low EN/UVLO = 1.15V 1.8 2.2 2.6 µA
EN/UVLO Pin Bias Current High EN/UVLO = 1.30V 10 100 nA
FBX Power Good Threshold Voltage FBX > 0V, PGOOD Falling
FBX < 0V, PGOOD Falling
V
FBX(REG)
– 0.08
V
FBX(REG)
+ 0.04
V
V
FBX Overvoltage Threshold FBX > 0V, PGOOD Rising
FBX < 0V, PGOOD Rising
V
FBX(REG)
+ 0.12
V
FBX(REG)
– 0.06
V
V
PGOOD Output Low (V
OL
) I
PGOOD
= 250µA 210 300 mV
PGOOD Leakage Current PGOOD = 42V 1 µA
INTV
CC
Minimum Voltage to Enable PGOOD Function
l
2.4 2.7 3.0 V
INTV
CC
Minimum Voltage to Enable SYNC Function
l
2.4 2.7 3.0 V
NMOS Gate Drivers
GATE Output Rise Time (T
R
) C
L
= 3300pF 20 ns
GATE Output Fall Time (T
F
) C
L
= 3300pF 20 ns
GATE Output Low (V
OL
) 0.05 V
GATE Output High (V
OH
) INTV
CC
– 0.05 V
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
= 12V, EN/UVLO = 12V, INTV
CC
= 4.75V, unless otherwise noted.
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: For V
IN
below 4V, the EN/UVLO pin must not exceed V
IN
for proper
operation.
Note 3: This pin is for switching purposes. Do not tie directly to a supply.
Note 4: The LT3759E is guaranteed to meet performance specifications
from the 0°C to 125°C operating junction temperature range.
Specifications over the –40°C to 125°C operating junction temperature
range are assured by design, characterization and correlation with
statistical process controls. The LT3759I is guaranteed over the full
–40°C to 125°C operating junction temperature range. The LT3759H is
guaranteed over the full –40°C to 150°C operating junction temperature
range. High junction temperatures degrade operating lifetimes. Operating
lifetime is derated at junction temperatures greater than 125°C.
Note 5: The LT3759 is tested in a feedback loop which servos V
FBX
to the
reference voltages (1.6V and –0.8V) with the VC pin forced to 1.3V.
Note 6: Rise and fall times are measured at 10% and 90% levels.
