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LTC3412

3412fb

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency vs Load Current

LOAD CURRENT (A)

0.001

100

3412 G01

VIN = 3.3V

VOUT = 2.5V

Burst Mode OPERATION

FORCED CONTINUOUS

0.1

0.01

100

LOAD CURRENT (A)

0.001

3412 G02

VOUT = 2.5V

1MHz

Burst Mode OPERATION

0.1

0.01

VIN = 3.3V

VIN = 5V

LOAD CURRENT (A)

0.001

100

3412 G03

VOUT = 2.5V

1MHz

FORCED CONTINUOUS

0.1

0.01

VIN = 3.3V

VIN = 5V

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

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

fOSC

Switching Frequency

ROSC = 309kΩ

0.88

0.95

1.1

MHz

Switching Frequency Range

(Note 6)

0.3

MHz

fSYNC

SYNC Capture Range

(Note 6)

0.3

MHz

RPFET

RDS(ON) of P-Channel FET

ISW = 1A (Note 7)

110

mΩ

RNFET

RDS(ON) of N-Channel FET

ISW = –1A (Note 7)

mΩ

ILIMIT

Peak Current Limit

5.4

VUVLO

Undervoltage Lockout Threshold

2.375

2.500

2.625

ILSW

SW Leakage Current

VRUN = 0V, VIN = 5.5V

0.1

μA

VRUN

RUN Threshold

0.5

0.65

0.8

IRUN

RUN/SS Leakage Current

μA

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: The LTC3412E is guaranteed to meet performance specifications

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

temperature range are assured by design, characterization and correlation

with statistical process controls. The LTC3412I is guaranteed to meet

specified performance over the – 40°C to 85°C temperature range.

Note 3: The LTC3412 is tested in a feedback loop that adjusts VFB to

achieve a specified error amplifier output voltage (ITH).

Note 4: Dynamic supply current is higher due to the internal gate charge

being delivered at the switching frequency.

Note 5: TJ is calculated from the ambient temperature TA and power

dissipation as follows: LTC3412: TJ = TA + PD (37.6°C/W).

Note 6: 4MHz operation is guaranteed by design and not production tested.

Note 7: Switch on resistance is guaranteed by design and test correlation

in the UF package and by production test in the FE package.

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