LTC3589 datasheet(8/50 Pages) LINER

8 / 50 page

LTC3589/LTC3589-1/

LTC3589-2

3589fe

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 LTC3589 are tested under pulsed load conditions such

that TJ ≈ TA. The LTC3589E are guaranteed to meet 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

LTC3589I are guaranteed over the –40°C to 125°C operating junction

temperature range and the LTC3589H are guaranteed over the full –40°C to

150°C operating junction temperature range. High junction temperatures

degrade operating lifetimes; operating lifetime is derated for junction

temperatures greater than 125°C. The junction temperature (TJ in °C) is

calculated from the ambient temperature (TA in °C) and power dissipation

(PD, in Watts) according to the formula:

TJ = TA + (PD • θJA), where the package junction to ambient thermal

impedance

θJA = 33°C/W.

Note that the maximum ambient temperature consistent with these

specifications is determined by specific operating conditions in

conjunction with board layout, the rated package thermal impedance and

other environmental factors.

Note 3: The LTC3589 include overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 150°C when overtemperature protection is active.

Continuous operation above the specified maximum operating temperature

may impair device reliability.

Note 4: Dropout voltage is defined as (VIN – VLDO) for LDO1 or

(VIN_LDO – VLDO) for other LDOs when VLDO is 3% lower than VLDO

measured with VIN = VIN_LDO = 4.3V.

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

delivered at the switching frequency.

Note 6: Soft-start measured in test mode with regulator error amplifier in

unity gain mode.

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VRSTO

RSTO Output Low Voltage

IRSTO = 3mA

0.1

0.4

IRSTO

RSTO Output High Leakage Current

VRSTO = 3.8V

–0.1

0.1

μA

VIRQ

IRQ Output Low Voltage

IIRQ = 3mA

0.1

0.4

IIRQ

IRQ Output High Leakage Current

VIRQ = 3.8V

–0.1

0.1

μA

The

l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = PVIN1 = PVIN2 = PVIN3 = PVIN4 = VIN_LDO2 = VIN_LDO34

= DVDD = 3.8V. All regulators disabled unless otherwise noted.

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