3

LTC3251/

LTC3251-1.2/LTC3251-1.5

32511215fb

2.7

10

9

8

7

6

5

4

3

2

1

0

4.2

5.2

3251 G17

3.2

3.7

4.7

–40

°C

25

°C

85

°C

2.7

50

45

40

85

°C

25

°C

–40

°C

35

30

25

20

4.2

5.2

3251 G02

3.2

3.7

4.7

2.7

7

6

5

4

3

2

1

0

4.2

5.2

3251 G01

3.2

3.7

4.7

–40

°C

25

°C

85

°C

TYPICAL PERFOR A CE CHARACTERISTICS

No Load Supply Current vs Supply

Voltage (Continuous Mode Spread

Spectrum Enabled)

No Load Supply Current vs Supply

Voltage (Burst Mode Operation)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Line Regulation (LTC3251)

0.2

%/V

Spread Spectrum Frequency Range

●

0.7

1.0

MHz

●

1.6

2

MHZ

Spread Spectrum Disabled Frequency

●

1.3

1.6

2

MHz

MD0, MD1 Input High Voltage

2.7V

●

0.8

1.2

V

MD0, MD1 Input Low Voltage

2.7V

●

0.4

0.8

V

MD0, MD1 Input High Current

●

–1

1

µA

MD0, MD1 Input Low Current

MD0 = 0V, MD1 = 0V

●

–1

1

µA

FB Input Current (LTC3251)

●

–50

50

nA

MODE Input High Voltage (LTC3251-1.2/LTC3251-1.5)

2.7V

●

50

70

MODE Input Low Voltage (LTC3251-1.2/LTC3251-1.5)

2.7V

●

30

50

MODE Input High Current (LTC3251-1.2/LTC3251-1.5)

●

–1

1

µA

MODE Input Low Current (LTC3251-1.2/LTC3251-1.5)

MODE = 0V

●

–1

1

µA

Turn-On Time (Burst or Continuous Mode Operation)

1

ms

Open-Loop Output Impedance (LTC3251)

●

0.45

0.7

Ω

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: Based on long term current density limitations.

Note 3: The LTC3251E is guaranteed to meet specified performance from

0

°C to 70°C. Specifications over the –40°C to 85°C operating temperature

range are assured by design, characterization and correlation with

statistical process controls.

Note 4: Minimum operating voltage required for regulation is:

Note 7: 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.

The

ELECTRICAL CHARACTERISTICS

No Load Supply Current vs Supply

Voltage (Continuous Mode,

Spread Spectrum Disabled)