LTC3622 datasheet(4/24 Pages) LINER

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LTC3622/

LTC3622-2/LTC3622-23/5

3622fc

For more information www.linear.com/LTC3622

The l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C. VIN1 = VIN2 = 12V, unless otherwise noted. (Notes 3, 6)

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

fOSC

Oscillator Frequency

LTC3622-2/LTC3622-23/5 –40°C ≤ TA ≤ 150°C

LTC3622

–40°C ≤ TA ≤ 125°C

LTC3622

–40°C ≤ TA ≤ 150°C

1.8

0.82

0.75

2.25

1.00

2.6

1.16

MHz

External CLK Amplitude

0.4

VINTVCC–0.3

SYNC Capture Range

% of Programmed Frequency

150

VINTVCC

INTVCC Voltage

3.3

3.6

3.9

Power Good Range

VIN > 4V

–7.5

–11

RPGOOD

Power Good Resistance

PGOOD RDS(ON) at 2mA

275

350

tPGOOD

PGOOD Delay

PGOOD Low to High

PGOOD High to Low

Cycles

Phase Shift Between Channel 1 and Channel

VPHASE = 0V

VPHASE = INTVCC, VMODE/SYNC = 0V

180

Deg

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. Transient Absolute Maximum Voltages should not be applied for

more than 4% of the switching duty cycle.

Note 3. The LTC3622 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3622E is guaranteed to meet specified performance 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 LTC3622I is guaranteed over the

–40°C to 125°C operating junction temperature range and the LTC3622H

is guaranteed over the -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. 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 environment

factors.

Note 4. The quiescent current in active mode does not include switching

loss of the power FETs.

Note 5. The LTC3622 is tested in a proprietary test mode that connects

VFB to the output of error amplifier.

Note 6. TJ is calculated from the ambient TA and power dissipation PD

according to the following formula: TJ = TA + (PD • θJA)

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