LTC4449 datasheet(3/14 Pages) LINER

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LTC4449

4449fa

The

l denotes the speciﬁcations which apply over the full operating junction

temperature range, otherwise speciﬁcations are at TA = 25°C. VCC = VLOGIC = VBOOST = 5V, VTS = GND = 0V, unless otherwise noted. (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 LTC4449 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC4449E 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

LTC4449I is guaranteed over the –40°C to 125°C operating junction

temperature range. Note that the maximum ambient temperature

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Signal (IN)

VIH(TG)

TG Turn-On Input Threshold

VLOGIC ≥ 5V, IN Rising

VLOGIC = 3.3V, IN Rising

1.9

3.5

2.2

2.6

VIL(TG)

TG Turn-Off Input Threshold

VLOGIC ≥ 5V, IN Falling

VLOGIC = 3.3V, IN Falling

2.75

1.8

3.25

2.09

3.75

2.5

VIH(BG)

BG Turn-On Input Threshold

VLOGIC ≥ 5V, IN Falling

VLOGIC = 3.3V, IN Falling

0.8

1.25

1.1

1.6

1.4

VIL(BG)

BG Turn-Off Input Theshold

VLOGIC ≥ 5V, IN Rising

VLOGIC = 3.3V, IN Rising

1.05

0.9

1.5

1.21

1.85

1.5

IIN(SD)

Maximum Current Into or Out of IN in

Shutdown Mode

VLOGIC ≥ 5V, IN Floating

VLOGIC = 3.3V, IN Floating

150

300

150

μA

High Side Gate Driver Output (TG)

VOH(TG)

TG High Output Voltage

ITG = –100mA, VOH(TG) = VBOOST – VTG

140

VOL(TG)

TG Low Output Voltage

ITG = 100mA, VOL(TG) = VTG – VTS

IPU(TG)

TG Peak Pull-Up Current

3.2

IPD(TG)

TG Peak Pull-Down Current

1.5

2.4

Low Side Gate Driver Output (BG)

VOH(BG)

BG High Output Voltage

IBG = –100mA, VOH(BG) = VCC – VBG

100

VOL(BG)

BG Low Output Voltage

IBG = 100mA

100

IPU(BG)

BG Peak Pull-Up Current

3.2

IPD(BG)

BG Peak Pull-Down Current

4.5

Switching Time

tPLH(TG)

BG Low to TG High Propagation Delay

tPHL(TG)

IN Low to TG Low Propagation Delay

tPLH(BG)

TG Low to BG High Propagation Delay

tPHL(BG)

IN High to BG Low Propagation Delay

tr(TG)

TG Output Rise Time

10% to 90%, CL = 3nF

tf(TG)

TG Output Fall Time

90% to 10%, CL = 3nF

tr(BG)

BG Output Rise Time

10% to 90%, CL = 3nF

tf(BG)

BG Output Fall Time

90% to 10%, CL = 3nF

consistent with these speciﬁcations is determined by speciﬁc operating

conditions in conjunction with board layout, the rated package thermal

impedance, and other environmental factors. The junction temperature TJ

is calculated from the ambient temperature TA and power dissipation PD

according to the following formula:

TJ = TA + (PD • 64°C/W)

Note 3: 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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