LTC3607 datasheet(3/20 Pages) LINER

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LTC3607

3607fb

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elecTrical characTerisTics

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

SVIN

Operating Voltage Range

4.5

PVIN

Operating Voltage Range

4.5

VOUT

Output Voltage Range

0.6

PVIN

VFB

Feedback Voltage (Note 3)

0.591

0.588

0.6

0.609

0.612

IFB

Feedback Pin Input Current

ΔVLINE REG

Reference Voltage Line Regulation

VIN = 4.5V to 15V (Note 3)

0.1

0.15

%/V

ΔVLOAD REG Output Voltage Load Regulation

MODE/SYNC = 0V (Note 3)

0.5

Input DC Supply Current

Active Mode

Sleep Mode (Both Channels)

Sleep Mode (Single Channel)

Shutdown

(Note 4)

VFB1 = VFB2 = 0.5V

VFB1 = VFB2 = 0.64V

VFB(1 or 2) = 0.64V

RUN1 = RUN2 = 0V

3.2

0.1

µA

fOSC

Oscillator Frequency

VFB1, 2 = 0.6V

1.8

2.25

2.7

MHz

fSYNC

Synchronization Frequency

1.0

4.0

MHz

ILIM

Peak Switch Current Limit

VFB1, 2 = 0.5V, Duty Cycle < 35%

0.75

1.25

RDS(ON)

Top Switch On-Resistance

Bottom Switch On-Resistance

(Note 6)

0.6

0.25

UVLO

SVIN Undervoltage Lockout Threshold

SVIN Rising

3.4

4.3

PGOOD

PGOOD1/2 Overvoltage Threshold

VFB1, 2 Rising

VFB1, 2 Hysteresis

8.5

–3

PGOOD1/2 Undervoltage Threshold

VFB1, 2 Ramping Down

VFB1, 2 Hysteresis

–11

–8.5

PGOOD1/2 On-Resistance

Channel 1 or Channel 2 Active

RUN1 = RUN2 = 0V

700

tPGOOD

Power Good Blanking Time

Cycles

IPGOOD

PGOOD Leakage

µA

VRUN

RUN1/2 VIL

RUN1/2 VIH

0.55

3.0

IRUN

RUN1/2 Leakage Current

0.01

µA

VMODE/SYNC MODE/SYNC VIL

MODE/SYNC VIH

0.3

1.0

tSOFTSTART

Internal Soft-Start Time

VFB from 10% to 90% Full Scale

PVIN1 = PVIN2 = SVIN = 4.5V

0.35

The l denotes the specifications which apply over the specified operating

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

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 LTC3607 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3607E 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

LTC3607I is guaranteed over the full –40°C to 125°C operating junction

temperature range.

The junction temperature (TJ) is calculated from the ambient temperature

(TA) and power dissipation (PD) according to the formula:

TJ = TA + (PD • θJA°C/W)

where

θJA is the package thermal impedance. Note that the maximum

ambient temperature is consistent with these specifications determined by

specific operating conditions in conjunction with board layout, the rated

package thermal resistance and other environmental factors.

Note 3. The LTC3607 is tested in a proprietary test mode that connects

VFB to the output of the error amplifier to an external servo loop.

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 formula: TJ = TA + (PD • θJA).

Note 6. The QFN switch on-resistance is guaranteed by correlation to

wafer level measurements.

Note 7. 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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