LTC3415 datasheet(4/36 Pages) LINER

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LTC3613

3613fa

The

l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C. SVIN = 15V, VFB = VOSNS+ – VOSNS–, unless otherwise noted. (Note 4)

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: TJ is calculated from the ambient temperature, TA, and power

dissipation, PD, as follows:

TJ = TA + (PD • 29°C/W) (θJA is simulated per JESD51-7 high effective

thermal conductivity test board)

θJC =1°C/W (θJC is simulated when heat sink is applied at the bottom

of the package.)

Note 3: The LTC3613 is tested in a feedback loop that adjusts VFB = VOSNS+

– VOSNS– to achieve a specified error amplifier output voltage (ITH).

Note 4: The LTC3613 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3613E is guaranteed to meet specifications from

0°C to 125°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

LTC3613I is guaranteed over the full –40°C to 125°C operating junction

temperature range. 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 5: Delay times are measured using 50% levels.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Oscillator and Clock Synchronization

fOSC

Free Running Switching Frequency

RT = 205k

RT = 80.6k

RT = 38.8k

175

450

900

200

500

1000

225

550

1100

kHz

CLKIH

Clock Input High Level Into Mode/PLLIN

CLKIL

Clock Input Low Level Into Mode/PLLIN

0.5

Internal VCC Regulator and External VCC

INTVCC

Internal VCC Voltage

6V < VIN < 24V

5.1

5.3

5.55

INTVCC(%)

Internal VCC Load Regulation

ICC = 0mA to 50mA

–1

–2

EXTVCC(TH)

EXTVCC Switchover Voltage

EXTVCC Rising

4.4

4.6

4.75

EXTVCC(HYS)

EXTVCC Switchover Hysteresis

200

ΔINTVCC

EXTVCC Voltage Drop

VEXTVCC = 5V. ICC = 50mA

200

PGOOD Output

PGDOV

PGOOD Upper Threshold

VFB Rising (With Respect to Regulated

Feedback Voltage VREG)

7.5

PGDUV

PGOOD Lower Threshold

VFB Falling (With Respect to Regulated

Feedback Voltage VREG)

–10

–7.5

–5

PGDHYS

PGOOD Hysteresis

VFB Returning

VPGD(LO)

PGOOD Low Voltage

IPGOOD = 5mA

0.15

0.4

tPGD(FALL)

Delay from OV/UV Fault to PGOOD Falling

(Note 5)

μs

tPGD(RISE)

Delay from OV/UV Recovery to PGOOD Rising (Note 5)

μs

RDS(ON)

Top Switch On-Resistance

Bottom Switch On-Resistance

7.5

5.5

mohm

ELECTRICAL CHARACTERISTICS

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