LT3798

3

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

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

96

102

107

mV

Minimum SENSE Current Limit Threshold

14

mV

Minimum SENSE Current Limit Threshold

4

mV

SENSE Input Bias Current

Current Out of Pin, SENSE = 0V

15

μA

FB Voltage

l

1.22

1.25

1.28

V

FB voltage Line Regulation

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

180

V/V

FB Error Amplifier Transconductance

ΔI = 5μA

170

UMHOS

Current Error Amplifier Voltage Gain

100

V/V

Current Error Amplifier Transconductance

ΔI = 5μA

50

UMHOS

Current Loop Voltage Gain

21

V/V

DCM Current Turn-On Threshold

Current Out of Pin

80

μA

Maximum Oscillator Frequency

150

kHz

Minimum Oscillator Frequency

4kHz

Minimum Oscillator Frequency

0.5

kHz

Backup Oscillator Frequency

20

kHz

Linear Regulator

No Load

9.8

10

10.4

V

500

900

mV

Current Limit

Below Undervoltage Threshold

12

25

mA

Current Limit

Above Undervoltage Threshold

80

120

mA

Gate Driver

18

ns

18

ns

0.01

V

50mV

V