LTC3442 datasheet(3/20 Pages) LINEAR

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LTC3442

3442f

VIN (V)

2.5

4.0

5.0

3442 G05

3.0

3.5

4.5

–2

–4

–6

–8

VOUT = 3.3V

1MHz

3442 G01

LOAD (mA)

0.1

100

1000

10000

100

Burst Mode

OPERATION

FIXED FREQUENCY

VIN = 5V

VIN = 3.3V

VIN = 2.5V

VIN = 5V

VIN = 3.3V

VIN = 2.5V

VOUT = 3.3V

600kHz

FREQUENCY (MHz)

0.50

0.75

1.00

1.25

1.50

3442 TA01b

1.75

–5

–10

2.00

VIN = 5V

VOUT SHORTED

VOUT DROPS 10%

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Burst Current Ratio

Ratio of IOUT to IBURST

20,000

Input Current Ratio

Ratio of IIN to IRLIM, IIN = 0.5A

70,000

RLIM Threshold

0.95

SHDN/SS Threshold

When IC is Enabled

●

0.4

0.7

1.4

When EA is at Max Boost Duty Cycle

2.2

2.4

SHDN/SS Input Current

VSHDN = 5.5V

0.01

µA

ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = VOUT = 3.6V, RT = 64.9k, unless otherwise noted.

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

of a device may be impaired.

Note 2: The LTC3442E is guaranteed to meet performance specifications

from 0°C to 70°C. Specifications over –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls.

Note 3: Current Measurements are performed when the outputs are not

switching.

Note 4: 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 result in device degradation or failure.

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency vs Load

Efficiency and Power Loss vs Load

Efficiency vs Frequency

Input Current Mirror Linearity

Average Input Current Limit

vs VIN (Normalized)

LOAD CURRENT (mA)

0.1

100

1000

10000

3442 G02

100

0.1

1000

100

Burst Mode

OPERATION

FIXED FREQUENCY

POWER LOSS

VIN = 3.6V

VOUT = 3.3V

FREQUENCY (kHz)

400

2000

3442 G03

800

1200

1600

600

1000

1400

1800

WITHOUT SCHOTTKY DIODES

WITH SCHOTTKY DIODES

VIN = 3.6V

VOUT = 3.3V

INPUT CURRENT (A)

1.00

0.90

0.80

0.60

0.70

0.50

0.40

0.30

0.20

0.10

0.00

.40

3442 G04

.10

.05

.15

.25

.35

.45

.20

.30

.50

VIN = 3.6V

VOUT = 3.3V

RLIM = 133k

(TA = 25°C unless otherwise specified).

Average Input Current Limit

vs Frequency (Normalized)

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