LT3759H(RevB) Ver la hoja de datos (PDF) - Linear Technology
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LT3759H Datasheet PDF : 32 Pages
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LT3759
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, EN/UVLO = 12V, INTVCC = 4.75V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX UNITS
VIN LDO Dropout Voltage (VIN – VINTVcc)
VIN = 3V, DRIVE = 0V,
l
IINTVCC = 20mA
INTVCC Undervoltage Lockout Threshold Falling
INTVCC Current in Shutdown
EN/UVLO = 0V
190
400
mV
1.3
1.45
V
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
IVIN < 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 Overvoltage Threshold
PGOOD Output Low (VOL)
PGOOD Leakage Current
FBX > 0V, PGOOD Falling
FBX < 0V, PGOOD Falling
FBX > 0V, PGOOD Rising
FBX < 0V, PGOOD Rising
IPGOOD = 250μA
PGOOD = 42V
VFBX(REG) – 0.08
V
VFBX(REG) + 0.04
V
VFBX(REG) + 0.12
V
VFBX(REG) – 0.06
V
210
300
mV
1
μA
INTVCC Minimum Voltage to Enable PGOOD Function
l
2.4
2.7
3.0
V
INTVCC Minimum Voltage to Enable SYNC Function
l
2.4
2.7
3.0
V
NMOS Gate Drivers
GATE Output Rise Time (TR)
GATE Output Fall Time (TF)
GATE Output Low (VOL)
CL = 3300pF
CL = 3300pF
20
ns
20
ns
0.05
V
GATE Output High (VOH)
INTVCC – 0.05
V
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 VIN below 4V, the EN/UVLO pin must not exceed VIN 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 VFBX 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.
3759fb
4
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