LTC3541EDD 查看數據表（PDF） - Linear Technology

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LTC3541EDD

High Efficiency Buck + VLDO Regulator

Linear Technology 

LTC3541

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

temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise specified (Note 2)

SYMBOL

fOSC

RPFET

RNFET

ILSW

VIH

VIL

IMODE,

IENBUCK,

IENVLDO

PARAMETER

Oscillator Frequency

RDS(ON) of P-Channel MOSFET

RDS(ON) of N-Channel MOSFET

SW Leakage

Input Pin High Threshold

Input Pin Low Threshold

Input Pin Current

CONDITIONS

ISW = 100mA

ISW = 100mA

Enable = 0V, VSW = 0V or 6V, VIN = 6V

MODE, ENBUCK, ENVLDO

MODE, ENBUCK, ENVLDO

MIN

l 1.8

l 0.9

l

l

TYP

2.25

0.25

0.35

±0.01

±0.01

MAX UNITS

2.7

MHz

Ω

Ω

±1

μA

V

0.3

V

±1

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 LTC3541 is guaranteed to meet performance specifications

from 0°C to 85°C. VLDO/linear regulator output is tested and specified

under pulse load conditions such that TJ ≈ TA, and are 100% production

tested at 25°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: Minimum operating LVIN voltage required for VLDO regulator

regulation is:

LVIN ≥ LVOUT + VDROPOUT and LVIN ≥ 0.9V

Note 4: Minimum operating VIN voltage required for VLDO regulator and

linear regulator regulation is:

VIN ≥ LVOUT + 1.4V and VIN ≥ 2.7V

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

dissipation, PD, according to the following formula:

TJ = TA + (PD • 43°C/W)

Note 6: The LTC3541 is tested in a proprietary test mode that connects

VBUCKFB to the output of the error amplifier. For the reference regulation

and line regulation tests, the output of the error amplifier is set to the

midpoint. For the load regulation test, the output of the error amplifier is

driven to minimum and maximum of the signal range.

Note 7: Measurement made in closed loop linear regulator configuration

with LVOUT = 1.2V, ILOAD = 10μA.

Note 8: Measurement made in a proprietary test mode with slope

compensation disabled.

Note 9: Measurement is assured by design, characterization and statistical

process control.

Note 10: 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 impair device reliability.

3541fb

4

For more information www.linear.com/LTC3541

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