3

LT3433

3433ia

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Feedback Reference Line Regulation

5.5V

q

0.002

0.01

%/V

q

35

100

nA

Error Amplifier Transconductance

q

200

270

330

umhos

Error Amplifier Voltage Gain

66

dB

Control Voltage to Switch Transconductance

0.55

A/V

Operating Frequency

185

200

215

kHz

q

170

230

kHz

Foldback Frequency

50

kHz

Minimum Switch On Time

q

250

450

ns

Minimum Switch Off Time

q

500

800

ns

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: Supply current specification does not include switch drive

currents. Actual supply currents will be higher.

Note 3: “Normal Operation” supply current specification does not include

current.

Note 4: Minimum times are tested using the high side switch with a 35

Ω

load to ground.

Note 5: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. Junction

temperature will exceed 125

°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 6: The LT3433E is guaranteed to meet performance specifications

from 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

LT3433I is guaranteed over the full –40

°C to 125°C operating junction

temperature range.

TYPICAL PERFOR A CE CHARACTERISTICS

TEMPERATURE (

°C)

–50

2.2

2.4

2.6

2.8

050

3433 G01

100

125

vs Temperature

0

620

590

560

530

500

3433 G02

15

30

45

60

0

0

100

200

300

400

500

10

20

30

40

3433 G11

50

60

BRIDGED

BUCK

SEE TYPICAL APPLICATION

ON THE FIRST PAGE OF

THIS DATA SHEET

Maximum Output Current