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LT3797

3797f

For more information www.linear.com/LT3797

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 24V; EN/UVLO = 24V; CTRL1, CTRL2, CTRL3, PWM1, PWM2,

PWM3 = 2V; SENSEN1, SENSEN2, SENSEN3 = 0V, unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PWM1, PWM2, PWM3 Input High Voltage

1.1

1.4

PWM1, PWM2, PWM3 Input Low Voltage

0.6

0.9

PWM1, PWM2, PWM3 Resistance to GND

200

kΩ

FLT1, FLT2, FLT3 Output Low

IFLT =1mA

300

SS1, SS2, SS3 Sourcing Current

SS1, SS2, SS3 = 1V, Current Out of Pin

µA

SS1, SS2, SS3 Sinking Current

SS1, SS2, SS3 = 1V, OVLO =1.3V

2.8

µA

SS1, SS2, SS3 Soft-Start Reset Threshold

Falling, Measured on SS1, SS2, SS3

Hysteresis

160

SS1, SS2, SS3 Fault Reset Threshold

Measured on SS1, SS2, SS3

1.7

NMOS Gate Drivers

GATE1, GATE2, GATE3 Output Rise Time (tr)

CGATE = 3300pF (Note 5)

GATE1, GATE2, GATE3 Output Fall Time (tf)

CGATE = 3300pF (Note 5)

Gate Output Low (VOL)

0.1

Gate Output High (VOH)

INTVCC –

0.05

PMOS Gate Drivers

TG1, TG2, TG3 Turn-On Time

CTG = 1000pF (Note 6)

200

TG1, TG2, TG3 Turn-Off Time

CTG = 1000pF (Note 6)

PMOS Gate On Voltage

(ISP1-TG1, ISP2-TG2, ISP3-TG3)

6.5

PMOS Gate Off Voltage

(ISP1-TG1, ISP2-TG2, ISP3-TG3)

0.3

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: Do not apply a positive or negative voltage or current source

to SW1, SW2, GATE1, GATE2, GATE3, TG1, TG2, TG3 pins, otherwise

permanent damage may occur.

Note 3: The LT3797E is guaranteed to meet performance specifications

from the 0°C to 125°C junction temperature. Specifications over the

–40°C to 125°C operating junction temperature range are assured by

design, characterization and correlation with statistical process controls.

The LT3797I is guaranteed over the full –40°C to 125°C operating junction

temperature range.

Note 4: FBH(REG) denotes the regulation voltage (|ISP-FBH|) of the

corresponding FBH pin.

Note 5: Rise and fall times are measured at 10% and 90% levels.

Note 6: Gate turn-on/turn-off time is measured from 50% level of PWM

voltage to 90% level of gate on/off voltage.

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