4

LTC1142/LTC1142L/LTC1142HV

TYPICAL PERFOR A CE CHARACTERISTICS

LTC1142, LTC1142HV

25

mV

125

150

175

mV

Shutdown Pin Threshold

0.55

0.8

2

V

Off-Time (Note 4)

3.8

5

6

µs

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

of a device may be impaired.

Note 3: This current is for one regulator block. Total supply current is the

sum of Pins 10 and 24 currents. Dynamic supply current is higher due to

the gate charge being delivered at the switching frequency. See the

Applications Information section.

time increases approximately 40%.

Note 5: The LTC1142/LTC1142L/LTC1142HV are guaranteed to meet

specified performance from 0

°C to 70°C and are designed, characterized

and expected to meet these extended temperature limits, but are not tested

at – 40

°C and 85°C. Guaranteed I-grade parts are available, consult the

factory.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

5V Output Efficiency

3.3V Output Efficiency

5V Efficiency vs Input Voltage

3.3V Efficiency vs Input Voltage

Load Regulation

Line Regulation

LOAD CURRENT (A)

0.01

100

95

90

85

0.1

1

1142 G01

2

LOAD CURRENT (A)

0.01

100

95

90

85

0.1

1

1142 G02

2

INPUT VOLTAGE (V)

0

100

98

96

94

92

90

88

86

84

82

80

16

1142 G03

4

8

12

20

FIGURE 1 CIRCUIT

INPUT VOLTAGE (V)

0

100

98

96

94

92

90

88

86

84

82

80

16

1142 G04

4

8

12

20

FIGURE 1 CIRCUIT

INPUT VOLTAGE (V)

0

40

30

20

10

0

–10

–20

–30

–40

16

1142 G05

4

8

12

20

FIGURE 1 CIRCUIT

LOAD CURRENT (A)

0

20

0

–20

–40

–60

–80

– 100

2.0

1142 G06

0.5

1.0

1.5

2.5

FIGURE 1 CIRCUIT

–40