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LTC3549

3549f

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. Voltage on any pin may not exceed 6V.

Note 2: The LTC3549E 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.

Note 3: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

LTC3549: TJ = TA + (PD)(64°C/W)

This IC includes overtemperature protection that is intended to protect the

device during momentary overload conditions. Overtemperature protection

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input DC Bias Current

Active Mode

Sleep Mode

Shutdown

(Note 5)

VOUT = 90%, ILOAD = 0A

VOUT = 103%, ILOAD = 0A

VRUN = 0V, VIN = 5.5V

300

0.1

475

µA

fOSC

Nominal Oscillator Frequency

●

1.8

2.25

2.7

MHz

tSS

Soft-Start Period

RUN↑

1ms

RPFET

RDS(ON) of P-Channel FET

ISW = 100mA, Wafer Level

ISW = 100mA, DD Package (Note 7)

0.5

0.56

RNFET

RDS(ON) of N-Channel FET

ISW = 100mA, Wafer Level

ISW = 100mA, DD Package (Note 7)

0.35

0.4

ILSW

SW Leakage

VRUN = 0V, VSW = 0V or 5.5V, VIN = 5.5V

±0.1

±1

µA

The ● denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C, VIN = 2.2V.

ELECTRICAL CHARACTERISTICS

becomes active at a junction temperature greater than the maximum

operating junction temperature. Continuous operation above the speciﬁed

maximum operating junction temperature may impair device reliability.

Note 4: The LTC3549 is tested in a proprietary test mode that connects VFB

to the output of the error ampliﬁer.

Note 5: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

Note 6: ΔVOVL is the amount VFB must exceed the regulated feedback

voltage.

Note 7: Determined by design, not production tested.

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