LTC3624 datasheet(4/20 Pages) LINER

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LTC3624/LTC3624-2

36242fc

For more information www.linear.com/LTC3624

The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TJ = 25°C. (Note 2) VIN = 12V, unless otherwise noted.

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 LTC3624/LTC3624-2 is tested under pulsed load conditions

such that TJ ≈ TA. The LTC3624E/LTC3624E-2 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 LTC3624I/LTC3624I-2 is guaranteed over the –40°C to 125°C

operating junction temperature range and the LTC3624H is guaranteed

over the –40°C to 150°C operating junction temperature range. High

junction temperatures degrade operating lifetimes; operation lifetime is

decreased for junction temperatures greater than 125°C. 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. TJ is calculated from the ambient, TA, and power dissipation, PD,

according to the following formula:

TJ = TA + (PD • θJA)

Note 3: The quiescent current in forced continuous mode does not include

switching loss of the power FETs.

Note 4: The LTC3624 is tested in a proprietary test mode that servos FB to

the output of the error amplifier.

Note 5: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. The maximum

rated junction temperature will be exceeded when overtemperature

protection is active Continuous operation above the specified maximum

operating junction temperature may impair device reliability. The

overtemperature protection level is not production tested but guaranteed

by design.

elecTrical characTerisTics

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VMODE/SYNC Pulse-Skipping Mode

Burst Mode Operation

Forced Continuous Mode

VINTVCC – 0.4

1.0

0.3

VINTVCC – 1.2

IMODE/SYNC

MODE/SYNC Input Current

100

tSS

Internal Soft-Start Time

ILIM

Peak Current Limit

VIN > 5V (E-, I-Grade)

VIN > 5V (H-Grade)

2.4

2.3

3.6

IFB

FB Input Current

IFB(VOUT)

Feedback Input Leakage Current

Fixed Output Versions

µA

VUVLO

VINTVCC Undervoltage Lockout

VIN Ramping Up

2.4

2.6

2.7

VUVLO(HYS)

VINTVCC Undervoltage Lockout Hysteresis

175

VOVLO

VIN Overvoltage Lockout Rising

VOVLO(HYS)

VIN Overvoltage Lockout Hysteresis

500

fOSC

Oscillator Frequency

LTC3624/LTC3624-3.3/LTC3624-5

(E-, I-Grade)

(H-Grade)

0.92

0.82

0.78

1.00

1.08

1.16

MHz

LTC3624-2/LTC3624-23.3/LTC3624-25

(E-, I-Grade)

(H-Grade)

2.05

1.8

1.7

2.25

2.45

2.6

MHz

fSYNC

SYNC Capture Range

LTC3624/LTC3624-3.3/LTC3624-5

150

LTC3624-2/LTC3624-23.3/LTC3624-25

140

VINTVCC

VINTVCC LDO Output Voltage

VIN > 4V

3.2

3.6

4.0

ΔVPGOOD

Power Good Range

LTC3624/LTC3624-2

±7.5

±11.5

LTC3624-3.3/LTC3624-5/LTC3624-23.3/

LTC3624-25

±7.5

±13

RPGOOD

Power Good Resistance

280

350

tPGOOD

PGOOD Delay

PGOOD Low to High

PGOOD High to Low

Cycles

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