LTC3545/LTC3545-1

3

35451fb

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 LTC3545E/LTC3545E-1 are guaranteed to meet performance

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

125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC3545I/LTC3545I-1 are guaranteed to meet performance specifications

over the full –40°C to 125°C operating junction temperature range.

This IC includes overtemperature protection that is intended to protect

the device during momentary overload conditions. Junction temperature

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Output Voltage Load Regulation (Notes 5, 6)

0.5

%

Feedback Pin Leakage (Note 5)

80

nA

Input DC Bias Current (All Regulators Enabled)

Pulse Skip (Active Mode)

Burst Mode Operation (All Regulators Sleeping)

680

58

0.1

750

70

2.0

μA

μA

μA

Oscillator Frequency

●

1.8

2.25

2.7

MHz

Synchronization Frequency

LTC3545 Only

●

13

MHz

RUNx Input High Voltage

●

1V

RUNx Input Low Voltage

●

0.3

V

RUN Leakage Current

±0.1

±1

μA

SWx Leakage

±0.1

±1

μA

SYNC Leakage

±0.1

±1

μA

Steady State (0.6V)

–7.5

–10

%

%

Power Good Pull-Down On-Resistance

●

14

50

Ω

MODE/SYNC Thresholds

0.93

V

Individual Regulator Characteristics (One Regulator Enabled)

Soft-Start Period

850

1100

μs

Peak Switch Current Limit

1

1.3

1.6

A

Input DC Bias Current

Pulse Skip (Active Mode)

Burst Mode Operation (Sleeping)

310

31

μA

μA

0.35

Ω

0.35

Ω

Undervoltage Lockout

●

1.8

2.25

V

will exceed 125°C when overtemperature is active. Continuous operation

above the specified maximum operating junction temperature may impair

device reliability.

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 is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 5: The LTC3545/LTC3545-1 are tested in a proprietary test mode that

Note 6: Load regulation is inferred by measuring the regulation loop gain.

Note 7: The QFN switch-on resistance is guaranteed by correlation to

water level measurements.

Note 8: Guaranteed by long-term current density limitations.