LTC3546 datasheet(4/28 Pages) LINER

4 / 28 page

LTC3546

3546fb

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

junction temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = VCCA = 3.6V, unless otherwise speciﬁed. (Note 2)

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

ISW1D(LKG)

Switch Leakage Current SW1D

VIN = 6V

VITH1 = VITH2 = 0V

VRUN1 = VRUN2 = 0V

0.01

μA

ISW2A/B(LKG)

Switch Leakage Current SW2A/B

VIN = 6V

VITH2 = 0V

VRUN2 = 0V

0.01

μA

VUVLO

Undervoltage Lockout Threshold

VIN1, VIN2, VCCA, VCCD Rising

VIN1, VIN2, VCCA, VCCD Falling

2.03

1.86

2.14

1.97

2.2

2.03

TPGOOD1

Threshold for Power Good

Percentage Deviation from Regulated VFB1

(Typically 0.6V).

VFB1 Ramping Up, VSYNC/MODE = 0V

–8

TPGOOD2

Threshold for Power Good

Percentage Deviation from Regulated VFB2

(Typically 0.6V).

VFB2 Ramping Up, VSYNC/MODE = 0V

–8

RPGOOD1

Power Good Pull-Down On-Resistance

132

300

RPGOOD2

Power Good Pull-Down On-Resistance

132

300

tSS

Soft-Start Internal Time.

VFB from 0% to 95%, VTRACK/SS Is Floating

0.8

1.2

1.9

VRUN1, VRUN2,

VPHASE

RUN1, RUN2, and PHASE Threshold

0.3

0.8

1.2

IRUN1, IRUN2,

IPHASE

RUN1, RUN2, and PHASE Leakage Current VIN = 6V, VPHASE = 3V, VRUN1 = VRUN2 = 3V

±0.01

±1

μA

VTLSYNC/MODE SYNC/MODE Threshold Voltage Low to Put

the Part into Pulse-Skipping Mode

0.5

VTHSYNC/MODE SYNC/MODE Threshold Voltage High to

Put the Part into Burst Mode Operation

VIN – 0.5

VSYNC/MODE

SYNC/MODE Threshold for Clock

Synchronization

0.3

0.8

1.2

ISYNC/MODE

SYNC/MODE Leakage Current

VIN = 6V, VSYNC/MODE = 3V

±0.01

±1

μA

VTHFREQ

FREQ Threshold Voltage High

VIN – 0.85

IBMC1, IBMC2

BMC1, BMC2 Leakage Current

VIN = 6V, VBMC = 3V

±0.4

μA

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 LTC3546E is guaranteed to meet performance speciﬁcations

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 LTC3546I is guaranteed

to meet performance speciﬁcations over the full –40°C to 125°C operating

junction temperature range

Note 3: The LTC3546 is tested in feedback loop which servos VFB1 to the

midpoint for the error ampliﬁer (VITH1 = 0.6V) and VFB2 to the midpoint for

the error ampliﬁer (VITH2 = 0.6V).

Note 4: Total supply current is higher due to the internal gate charge being

delivered at the switching frequency.

Note 5: Variable frequency operation with resistor is guaranteed by design

and is subject to duty cycle limitations.

Note 6: 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.

Note 7: TJ is calculated from the ambient temperature, TA, and power

dissipation, PD, according to the following formula:

TJ = TA + (PD • 34°C/W)

Note 8: Minimum current limit is guaranteed by design and correlation to

the RDS(ON)1D, ILIM1 and ILIM2 measurements.

LTC3546 Datasheet(PDF) 4 Page - Linear Technology

LTC3546 Datasheet(HTML) 4 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Datasheet Download

Link URL