LTC3609 datasheet(4/26 Pages) LINER

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LTC3609

3609fb

elecTrical characTerisTics

Theldenotesthespecificationswhichapplyoverthefulloperating

junctiontemperaturerange,otherwisespecificationsareatTA=25°C.VIN=15Vunlessotherwisenoted.

Note1: 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.

Note2: 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).

Note3: The LTC3609 is tested in a feedback loop that adjusts VFB to

achieve a specified error amplifier output voltage (ITH). The specification at

85°C is not tested in production. This specification is assured by design,

characterization, and correlation to testing at 125°C.

Note4: The LTC3609 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3609E 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

LTC3609I 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.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

InternalVCCRegulator

VINTVCC

Internal VCC Voltage

6V < VIN < 30V, VEXTVCC = 4V

4.7

5.5

∆VLDO(LOADREG)

Internal VCC Load Regulation

ICC = 0mA to 20mA, VEXTVCC = 4V

–0.1

±2

VEXTVCC

EXTVCC Switchover Voltage

ICC = 20mA, VEXTVCC Rising

4.5

4.7

∆VEXTVCC

EXTVCC Switch Drop Voltage

ICC = 20mA, VEXTVCC = 5V

150

300

∆VEXTVCC(HYS)

EXTVCC Switchover Hysteresis

500

PGOODOutput

∆VFBH

PGOOD Upper Threshold

VFB Rising

∆VFBL

PGOOD Lower Threshold

VFB Falling

–7

–10

–13

∆VFB(HYS)

PGOOD Hysteresis

VFB Returning

2.5

VPGL

PGOOD Low Voltage

IPGOOD = 5mA

0.15

0.4

TransientResponse

(DiscontinuousMode)

Start-Up

LOAD STEP 0A TO 5A

VIN = 25V

VOUT = 2.5V

FCB = 0V

FIGURE 6 CIRCUIT

3609 G01

20µs/DIV

VOUT

200mV/DIV

5A/DIV

ILOAD

5A/DIV

LOAD STEP 1A TO 6A

VIN = 25V

VOUT = 2.5V

FCB = INTVCC

FIGURE 6 CIRCUIT

3609 G02

20µs/DIV

VOUT

200mV/DIV

5A/DIV

ILOAD

5A/DIV

VIN = 12V

VOUT = 2.5V

RLOAD = 0.5

FIGURE 6 CIRCUIT

3609 G03

40ms/DIV

RUN/SS

2V/DIV

VOUT

1V/DIV

5A/DIV

Typical perForMance characTerisTics

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