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LT3798

3798f

ELECTRICAL CHARACTERISTICS

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: The LT3798E is guaranteed to meet specified performance from

0°C to 125°C junction temperature. Specification over the –40°C and

The

l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 18V, INTVCC = 11V, unless otherwise noted.

125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

3798I is guaranteed to meet specified performance from –40°C to 125°C

operating junction temperature range.

Note 3: Current flows out of the FB pin.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SENSE Current Limit Threshold

VIN_SENSE = 150μA

102

107

Minimum SENSE Current Limit Threshold

VIN_SENSE = 34μA

Minimum SENSE Current Limit Threshold

VIN_SENSE = 21μA

SENSE Input Bias Current

Current Out of Pin, SENSE = 0V

μA

FB Voltage

1.22

1.25

1.28

FB voltage Line Regulation

10V < VIN < 35V

0.01

0.03

%/V

FB Pin Bias Current

(Note 3), FB = 1V

4.05

4.25

4.4

μA

FB Error Amplifier Voltage Gain

ΔVVC/ΔVFB, CTRL1=1V, CTRL2=2V, CTRL3=2V

180

V/V

FB Error Amplifier Transconductance

ΔI = 5μA

170

UMHOS

Current Error Amplifier Voltage Gain

ΔVCOMP+/ΔVCOMP–, CTRL1 = 1V, CTRL2 = 2V, CTRL3 = 2V

100

V/V

Current Error Amplifier Transconductance

ΔI = 5μA

UMHOS

Current Loop Voltage Gain

ΔVCTRL/ΔVSENSE,1000pF Cap from COMP+ to COMP–

V/V

DCM Current Turn-On Threshold

Current Out of Pin

μA

Maximum Oscillator Frequency

COMP+ = 0.95V, VIN_SENSE = 150μA

150

kHz

Minimum Oscillator Frequency

COMP+ = 0V, VFB <VOVP

4kHz

Minimum Oscillator Frequency

COMP+ = 0V, VFB >VOVP

0.5

kHz

Backup Oscillator Frequency

kHz

Linear Regulator

INTVCC Regulation Voltage

No Load

9.8

10.4

Dropout (VIN-INTVCC)IINTVCC = –10mA, VIN = 10V

500

900

Current Limit

Below Undervoltage Threshold

Current Limit

Above Undervoltage Threshold

120

Gate Driver

tr GATE Driver Output Rise Time

CL = 3300pF, 10% to 90%

tf GATE Driver Output Fall Time

CL = 3300pF, 90% to 10%

GATE Output Low (VOL)

0.01

GATE Output High (VOH)

INTVCC-

50mV

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