LTC3621 datasheet(3/16 Pages) LINER

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LTC3621/LTC3621-2

3621f

For more information www.linear.com/LTC3621

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

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

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 LTC3621 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3621E 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

LTC3621I is guaranteed over the –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 4: The quiescent current in forced continuous mode does not include

switching loss of the power FETs.

Note 5: The LTC3621 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)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VFB

Regulated Feedback Voltage

0.594

0.591

0.6

0.606

0.609

IFB

FB Input Current

ΔVLINE(REG)

Reference Voltage Line Regulation

VIN = 2.7V to 17V (Note 5)

0.01

0.015

%/V

ΔVLOAD(REG) Output Voltage Load Regulation

(Note 5)

0.1

ILSW

NMOS Switch Leakage

PMOS Switch Leakage

0.1

µA

RDS(ON)

NMOS On-Resistance

PMOS On-Resistance

VIN = 5V

0.15

0.37

DMAX

Maximum Duty Cycle

VFB = 0.5V, VMODE = 1.5V

100

tON(MIN)

Minimum On-Time

VFB = 0.7V, VMODE = 1.5V

VRUN

RUN Input High Threshold

RUN Input Low Threshold

0.3

1.0

IRUN

RUN Input Current

VRUN = 12V

VMODE

Pulse-Skipping Mode

Burst Mode Operation

Forced Continuous Mode

VINTVCC – 0.4

1.0

0.3

VINTVCC – 1.0

IMODE

MODE Input Current

VMODE = 3.6V

tSS

Internal Soft-Start Time

0.5

ILIM

Peak Current Limit

1.44

1.30

1.60

1.76

1.80

VUVLO

VINTVCC Undervoltage Lockout

VIN Ramping Up

2.4

2.6

2.7

VUVLO(HYS)

VINTVCC Undervoltage Lockout Hysteresis

250

VOVLO

VIN Overvoltage Lockout Rising

VOVLO(HYS)

VIN Overvoltage Lockout Hysteresis

300

fOSC

Oscillator Frequency

2.25MHz Parts

1MHz Parts

2.25MHz Parts

1MHz Parts

2.05

0.92

1.8

0.82

2.25

1.00

2.45

1.08

2.6

1.16

MHz

VINTVCC

VINTVCC LDO Output Voltage

VIN > 4V

3.3

3.6

3.9

ΔVPGOOD

Power Good Range

±7.5

±11

RPGOOD

Power Good Resistance

PGOOD RDS(ON) at 500µA

275

350

tPGOOD

PGOOD Delay

PGOOD Low to High

PGOOD High to Low

Cycles

IPGOOD

PGOOD Leakage Current

100

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