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LTC3542

3542fa

TYPICAL PERFORMANCE CHARACTERISTICS

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. No pin should exceed 6V.

Note 2: The LTC3542 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 LTC3542I is guaranteed over the full

–40°C to 125°C operating temperature range.

Note 3: Failure to solder the Exposed Pad of the package to the PC board

will result in a thermal resistance much higher than 102°C/W.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input DC Supply Current (Note 5)

Active Mode

Sleep Mode

Shutdown

VFB = 0.5V

VFB = 0.7V, MODE = 0V

RUN = 0V

0.1

500

μA

fOSC

Oscillator Frequency

VFB = 0.6V

●

1.8

2.25

2.7

MHz

fSYNC

Synchronous Frequency

VFB = 0.6V

MHz

ILIM

Peak Switch Current

VIN = 3V, VFB = 0.5V, Duty Cycle < 35%

650

1000

RDS(ON)

P-Channel On Resistance (Note 6)

N-Channel On Resistance (Note 6)

ISW = 100mA

ISW = –100mA

0.5

0.35

0.65

0.55

ISW(LKG)

Switch Leakage Current

VIN = 5V, VRUN = 0V, VSW = 0V or 5V

±0.01

±1

μA

VUVLO

Undervoltage Lockout Threshold

VIN Rising

VIN Falling

1.8

2.0

1.9

2.3

VRUN

RUN Threshold

●

0.3

1.5

IRUN

RUN Leakage Current

●

±0.01

±1

μA

VMODE/SYNC

MODE/SYNC Threshold

●

0.3

1.2

IMODE/SYNC

MODE/SYNC Leakage Current

●

±0.01

±1

μA

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

the output of the error ampliﬁer to the SW pin, which is connected to an

external servo loop.

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

being delivered at the switching frequency.

Note 6: The DFN switch on resistance is guaranteed by correlation to wafer

level measurements.

Note 7: TJ is calculated from the ambient temperature TA and power

dissipation PD according to the following formula:

TJ = TA + (PD) • (θJA).

Burst Mode Operation

Pulse Skip Mode Operation

Start-Up from Shutdown

2V/DIV

VIN = 3.6V

VOUT = 1.8V

ILOAD = 25mA

FIGURE 3a CIRCUIT

μs/DIV

3542 G01

VOUT

50mV/DIV

AC COUPLED

100mA/DIV

2V/DIV

100mA/DIV

VIN = 3.6V

VOUT = 1.8V

ILOAD = 25mA

FIGURE 3a CIRCUIT

400ns/DIV

3542 G02

VOUT

50mV/DIV

AC COUPLED

RUN

2V/DIV

100mA/DIV

VIN = 3.6V

VOUT = 1.8V

ILOAD = 0A

FIGURE 3a CIRCUIT

400

μs/DIV

3542 G03

VOUT

1V/DIV

TA = 25°C unless otherwise speciﬁed.

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

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

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