LTC3561A datasheet(3/20 Pages) LINER

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LTC3561A

3561af

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

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 3.6V, RT = 125k unless otherwise speciﬁed. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input DC Supply Current (Note 4)

Active Mode

Shutdown

VFB = 0.75V

VSHDN/RT = 3.6V

330

0.1

450

μA

VSHDN/RT

Shutdown Threshold High Active

Oscillator Resistor

VIN – 0.6

125k

VIN – 0.4

fOSC

Oscillator Frequency

RT = 125k

(Note 7)

2.25

2.5

2.8

MHz

ILIM

Peak Switch Current Limit

VFB = 0.5V

1.3

2.0

2.5

RDS(ON)

Top Switch On-Resistance

(Note 6)

0.15

0.18

Bottom Switch On-Resistance

(Note 6)

0.13

0.16

ISW(LKG)

Switch Leakage Current

VIN = 5V, VSHDN/RT = 3.6V, VSW = 0V or 5V

0.01

μA

VUVLO

Undervoltage Lockout Threshold

VIN Ramping Down

1.8

2.1

2.4

tSOFT-START

10% to 90% of Regulation

0.5

0.8

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 LTC3561AEDD is guaranteed to meet speciﬁed performance

speciﬁcations from 0°C to 85°C junction temperature. Speciﬁcations over

the –40°C to 125°C operating junction temperature range are assured by

design, characterization and correlation with statistical process controls.

The LTC3561AIDD is guaranteed over the full –40°C to 125°C operating

junction temperature range.

Note 3: The LTC3561A is tested in a feedback loop which servos VFB to the

midpoint for the error ampliﬁer (VITH = 0.7V).

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 TA and power dissipation PD

according to the following formulas:

TJ = TA + (PD • 43°C/W)

Note 6: Switch on-resistance is sampled at wafer level measurements and

assured by design, characterization and correlation with statistical process

controls.

Note 7: 4MHz operation is guaranteed by design but not production tested

and is subject to duty cycle limitations (see Applications Information).

Note 8: 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.

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