LTC4217CDHC datasheet(4/18 Pages) LINER

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LTC4217

4217fc

ELECTRICAL CHARACTERISTICS

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: All currents into pins are positive, all voltages are referenced to

GND unless otherwise speciﬁed.

Note 3: An internal clamp limits the GATE pin to a maximum of 6.5V

above OUT. Driving this pin to voltages beyond the clamp may damage the

device.

Note 4: 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.

The

l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VDD = 12V unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Inputs

IIN

OV, UV, FB Pin Input Current

VIN = 1.2V, LTC4217

0±1

μA

RIN

OV, UV, FB Pin Input Resistance

LTC4217-12

VTH

OV, UV, FB Pin Threshold Voltage

VIN Rising

1.21

1.235

1.26

ΔVOV(HYST)

OV Pin Hysteresis

ΔVUV(HYST)

UV Pin Hysteresis

110

VUV(RTH)

UV Pin Reset Threshold Voltage

VUV Falling

0.55

0.62

0.7

ΔVFB(HYST)

FB Pin Power Good Hysteresis

RISET

ISET Pin Output Resistor

19.5

20.5

Outputs

VOL

PG, FLT Pin Output Low Voltage

IOUT = 2mA

0.4

0.8

IOH

PG, FLT Pin Input Leakage Current

VOUT = 30V

±10

μA

VTIMER(H)

TIMER Pin High Threshold

VTIMER Rising

1.2

1.235

1.28

VTIMER(L)

TIMER Pin Low Threshold

VTIMER Falling

0.1

0.21

0.3

ITIMER(UP)

TIMER Pin Pull-Up Current

VTIMER = 0V

–80

–100

–120

μA

ITIMER(DN)

TIMER Pin Pull-Down Current

VTIMER = 1.2V

1.4

2.6

μA

ITIMER(RATIO)

TIMER Pin Current Ratio ITIMER(DN)/ITIMER(UP)

1.6

2.7

AIMON

IMON Pin Current Gain

IOUT = 2A

47.5

52.5

μA/A

IOFF(IMON)

IMON Pin Offset Current

IOUT = 132mA

±7.5

μA

IGATE(UP)

Gate Pull-Up Current

Gate Drive On, VGATE = VOUT = 12V

–19

–24

–29

μA

IGATE(DN)

Gate Pull-Down Current

Gate Drive Off, VGATE = 18V, VOUT = 12V

190

250

340

μA

IGATE(FST)

Gate Fast Pull-Down Current

Fast Turn Off, VGATE = 18V, VOUT = 12V

140

AC Characteristics

tPHL(GATE)

Input High (OV), Input Low (UV) to Gate Low

Propagation Delay

VGATE < 16.5V Falling

810

μs

tPHL(ILIM)

Short-Circuit to Gate Low

VFB = 0, Step ISENSE to 1.2A,

VGATE < 16.5V Falling

μs

tD(ON)

Turn-On Delay

Step VUV to 2V, VGATE > 13V

100

150

tD(CB)

Circuit Breaker Filter Delay Time (Internal)

VFB = 0V, Step ISENSE to 1.2A

1.5

2.7

tD(AUTO-RETRY)

Auto-Retry Turn-On Delay (Internal)

100

150

Note 5: TJ is calculated from the ambient temperature, TA, and power

dissipation, PD, according to the formula:

LTC4217DHC, LTC4217DHC-12: TJ = TA + (PD • 43°C/W)

LTC4217FE: TJ = TA + (PD • 38°C/W)

Note 6: For the DHC package, switch on-resistance is guaranteed by

design and test correlation.

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