LTC3111 datasheet(4/32 Pages) LINER

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LTC3111

3111fa

For more information www.linear.com/LTC3111

TYPICAL PERFORMANCE CHARACTERISTICS

Maximum Output Current

in PWM Mode vs VIN

Maximum Load Current in Burst

Mode Operation vs VIN

Wide VIN to 5VOUT Efficiency

Wide VIN to 5VOUT Power Loss

Wide VIN to 3.3VOUT Efficiency

Wide VIN to 3.3VOUT Power Loss

ELECTRICAL CHARACTERISTICS

Note 3: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperatures will exceed 150°C when overtemperature protection is

active. Continuous operation above the specified maximum operating

junction temperature may impair device reliability.

Note 4: Voltage transients on the switch pins beyond the DC limit specified

in the Absolute Maximum Ratings, are non-disruptive to normal operation

when using good layout practices, as shown on the demo board or

described in the data sheet and application notes.

Note 5: The junction temperature (TJ in °C) is calculated from the ambient

temperature (TA in °C) and power dissipation (PD in Watts) according to

the formula:

TJ = TA + (PD • θJA)

where

θJA (in °C/W) is the package thermal impedance.

Note 6: SYNC frequency range is tested with a square wave. Operation

with 100ns minimum high or low time is assured by design.

Note 7: Switch timing measurements are made in an open-loop test

configuration. Timing in the application may vary somewhat from these

values due to differences in the switch pin voltage during the non-overlap

durations when the switch pin voltage is influenced by the magnitude and

direction of the inductor current.

TA = 25°C, VIN = 5V, VOUT = 5V, unless otherwise specified

VIN (V)

0.2

0.6

0.8

1.0

8 9 10

2.0

1.8

3111 G01

0.4

3 4 5 6 7

1.2

1.4

1.6

VOUT = 3.3V, L = 4.7µH

VOUT = 5V, L = 6.8µH

VOUT = 12V, L = 10µH

INPUT CURRENT LIMIT = 2.3A

VIN (V)

2 3 4

400

600

3111 G02

200

5 6 7 8 9 10 11 12 13 14 15

800

300

500

100

700

VOUT = 3.3V

VOUT = 5V

VOUT = 12V

LOAD CURRENT (A)

100

0.0001

0.01

0.1

3111 G03

0.001

VIN = 2.7V

VIN = 5V

VIN = 12V

BURST

PWM

LOAD CURRENT (A)

0.0001

0.001

0.0001

0.001

0.1

0.01

0.1

3111 G04

0.01

VIN = 2.7V

VIN = 5V

VIN = 12V

BURST

PWM

LOAD CURRENT (A)

0.0001

0.001

100

0.01

0.1

3111 G05

VIN = 2.7V

VIN = 5V

VIN = 12V

BURST

PWM

LOAD CURRENT (A)

0.01

0.1

0.01

0.1

3111 G06

0.0001

0.001

0.0001

0.001

VIN = 2.7V

VIN = 5V

VIN = 12V

BURST

PWM

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