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LT3759

3759fb

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN LDO Dropout Voltage (VIN – VINTVcc)VIN = 3V, DRIVE = 0V,

IINTVCC = 20mA

190

400

INTVCC Undervoltage Lockout Threshold Falling

1.3

1.45

INTVCC Current in Shutdown

EN/UVLO = 0V

μA

Logic

EN/UVLO Threshold Voltage Falling

1.17

1.22

1.27

EN/UVLO Rising Hysteresis

EN/UVLO Input Low Voltage

IVIN < 1μA

0.4

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

100

FBX Power Good Threshold Voltage

FBX > 0V, PGOOD Falling

FBX < 0V, PGOOD Falling

VFBX(REG) – 0.08

VFBX(REG) + 0.04

FBX Overvoltage Threshold

FBX > 0V, PGOOD Rising

FBX < 0V, PGOOD Rising

VFBX(REG) + 0.12

VFBX(REG) – 0.06

PGOOD Output Low (VOL)IPGOOD = 250μA

210

300

PGOOD Leakage Current

PGOOD = 42V

μA

INTVCC Minimum Voltage to Enable PGOOD Function

2.4

2.7

3.0

INTVCC Minimum Voltage to Enable SYNC Function

2.4

2.7

3.0

NMOS Gate Drivers

GATE Output Rise Time (TR)CL = 3300pF

GATE Output Fall Time (TF)CL = 3300pF

GATE Output Low (VOL)

0.05

GATE Output High (VOH)INTVCC – 0.05

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.

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.

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