4

LTC1266

LTC1266-3.3/LTC1266-5

ELECTRICAL C

C

HARA TERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Current Sense Threshold

(Burst Mode Operation Enabled)

LTC1266

25

mV

135

155

180

mV

LTC1266-3.3, LTC1266-5

25

mV

135

155

180

mV

Sense 2

Current Sense Threshold

(Burst Mode Operation Disabled)

LTC1266

–20

mV

130

155

185

mV

LTC1266-3.3, LTC1266-5

–20

mV

130

155

185

mV

Shutdown Pin Threshold

0.55

0.8

2

V

Off-Time (Note 3)

3.8

5

6.5

µs

temperature range.

Note 2: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency. See Applications Information.

time increases approximately 40%.

Note 4: The LTC1266, LTC1266-3.3, and LTC1266-5 are not tested and

not quality assurance sampled at – 40

°C and 85°C. These specifications

are guaranteed by design and/or correlation.

Note 5: Unless otherwise noted the specifications for the LTC1266A are

the same as those for the LTC1266.

Efficiency vs Input Voltage

LOAD CURRENT (A)

0

–50

–40

–30

–20

20

0

1

2

10

–10

3

4

5

LTC1266 • TPC03

FIGURE 1 CIRCUIT

OPERATION ENABLED)

OPERATION INHIBITED)

Line Regulation

Load Regulation

INPUT VOLTAGE (V)

3

70

75

80

85

90

100

4

56

7

LTC1266 • TPC01

89

95

FIGURE 1 CIRCUIT

CC

HARA TERISTICS

A

TYPICALPERFOR

CE

INPUT VOLTAGE (V)

3

0

10

20

9

LTC1266 • TPC02

–10

–20

–40

45678

–30

40

30

FIGURE 1 CIRCUIT