LTC3589 datasheet(8/44 Pages) LINER

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LTC3589

3589p

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 is tested under pulsed load conditions such that TJ ≈ TA.

The LTC3589E is 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 is guaranteed

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

LTC3589H is 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 = 34°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 includes 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

TYPICAL PERFORMANCE CHARACTERISTICS

Standby IVIN vs VIN

LDO2 to LDO4 IDD IVIN vs VIN

TA = 25°C, unless otherwise noted.

Step-Down Switching Regulator

IDD vs VIN

Input Supply Current vs

Temperature

Buck-Boost IDD vs VIN

Step-Down Switching Regulator

IDD vs VIN

VOLTAGE (V)

2.5

4.0

22554 G01

3.0

3.5

4.5

5.0

5.5

ALL REGULATORS DISABLED

VOLTAGE (V)

2.5

4.0

3589 G02

150

3.0

3.5

4.5

250

200

100

5.0

5.5

ENABLE TWO LDOs

ENABLE ONE LDO

ENABLE THREE LDOs

VOLTAGE (V)

2.5

4.0

3589 G03

400

500

600

200

100

3.0

3.5

4.5

900

800

700

300

5.0

5.5

ENABLE TWO BUCKS

ENABLE ONE BUCK

ENABLE THREE BUCKS

PULSE-SKIPPING MODE

VOLTAGE (V)

2.5

4.0

3589 G04

100

120

3.0

3.5

4.5

5.0

5.5

ENABLE TWO BUCKS

ENABLE ONE BUCK

ENABLE THREE BUCKS

Burst Mode OPERATION

TEMPERATURE (°C)

–50

3589 G05

800

1000

1200

400

200

–25

600

100 125

150

ALL REGULATORS ENABLED

Burst Mode OPERATION

STANDBY (ONLY LDO1 ON)

ALL REGULATORS ENABLED

PULSE-SKIPPING MODE

VOLTAGE (V)

2.5

4.5

4.0

3589 G06

350

400

450

150

200

100

3.0

3.5

5.0

300

250

5.5

Burst Mode OPERATION

FORCED

CONTINUOUS

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