LTC3125 datasheet(4/18 Pages) LINER

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LTC3125

3125fa

Burst Mode Threshold Current

vs VIN

Oscillator Frequency vs VOUT

Efﬁciency vs Load Current,

VOUT = 5V

Average Input Current Limit vs VIN

Average Input Current Limit

vs Temperature

Average Input Current vs RPROG

Peak Current Limit vs VIN

TYPICAL PERFORMANCE CHARACTERISTICS (T

A = 25°C unless otherwise noted)

No-Load Input Current vs VIN

Burst Mode Threshold Current

vs VIN

VIN (V)

1.5

–0.5

0.5

3.0

4.0

3125 G05

–1.0

–1.5

–2.0

2.0

2.5

3.5

1.0

1.5

2.0

NORMALIZED TO 25°C

4.5

TEMPERATURE (°C)

–50

–1.50

–1.00

–0.50

0.50

1.50

–25

025

3125 G06

100

1.00

NORMALIZED TO 25°C

VIN (V)

1.5

2.15

2.45

2.50

2.55

4.5

3125 G08

2.05

2.35

2.25

2.10

2.40

2.00

2.30

2.20

2.5

3.5

5.5

VOUT = 3.8V

RPROG = 0Ω

VOUT (V)

2.0

–8

–7

–5

–4

–3

–1

2.5

3.5

4.0

3125 G11

–6

–2

3.0

4.5

5.0

NORMALIZED TO VOUT = 3.3V

LOAD CURRENT (A)

0.001

0.01

0.1

3125 G03

100

0.1

0.01

0.001

VIN = 4V

VIN = 3.3V

VIN (V)

1.5

2.0

2.5

3125 G04

1.0

0.5

2.5

3.5

3.0

3.5

4.0

VOUT = 4V

VOUT = 2.5V

VOUT = 3.8V

VOUT = 3.3V

RPROG (kΩ)

10 20 30 40 50

70 80 90 100

0.25

0.50

0.75

1.00

110

3125 G07

1.25

VIN (V)

1.8

2.6

3125 G09

2.0

2.2

2.4

2.8

VOUT = 3.3V

COUT = 1500μF

L = 2.2μH

VIN (V)

1.8

1.9

2.0

2.1

2.2

3125 G10

VOUT = 2.5V

COUT = 1500μF

L = 2.2μH

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