LTC4221IGN datasheet(3/28 Pages) LINER

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LTC4221

4221f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VON(OFF)

n Off Threshold

High to Low, GATE

n Turns Off by 100µA

●

0.796

0.821

0.846

Pull-Down

∆VON(OFFHYST)

n Off Threshold Hysteresis

IFB(IN)

n Input Current

0V ≤ VFBn ≤ VCCn

●

±0.01

±1

µA

VFB(UV)

n Undervoltage Threshold

n Falling

●

0.605

0.617

0.629

∆VFB(UVHYST)

n Undervoltage Threshold Hysteresis

∆VFB(LREG)

n Threshold Line Regulation

2.7V ≤ VCC1 ≤ 13.5V

VFB(OV)

n Overvoltage Threshold

n Rising

●

0.805

0.822

0.838

IFILTER(UP)

FILTER Pull-Up Current

During Current Fault Condition

●

–80

–105

–132

µA

IFILTER(DN)

FILTER Pull-Down Current

During Normal Cycle

●

1.15

1.8

2.45

µA

VFILTER(TH)

FILTER Threshold

Latched Off Threshold, FILTER Rising

●

1.18

1.24

1.30

∆VFILTER(HYST)

FILTER Threshold Hysteresis

105

ITMR(UP1)

TIMER Pull-Up Current 1

Initial Timing Cycle

●

–1.2

–1.9

–2.6

µA

ITMR(UP2)

TIMER Pull-Up Current 2

Start-Up Cycle

●

–15

–20

–25

µA

ITMR(FSTDN)

TIMER Pull-Down Current

VTIMER = 1.5V, End of Initial Timing Cycle

VTMR(H)

TIMER High Threshold

TIMER Rising

●

1.172

1.234

1.27

VTMR(L)

TIMER Low Threshold

TIMER Falling

●

0.1

0.4

0.5

IFAULT(UP)

FAULT Pull-Up Current

●

–2.5

–3.8

–5

µA

VFAULT(TH)

FAULT Threshold

FAULT Falling

●

0.791

0.816

0.841

∆VFAULT(HYST)

FAULT Hysteresis

VFAULT(OL)

FAULT Output Low Voltage

IFAULT = 1.6mA, VCC1 = 5V

●

0.14

0.4

IPWRGD(LK)

PWRGD

n Leakage Current

VPWRGDn = VCC1, VFBn = 0.7V, Normal Cycle ●

±0.01

±10

µA

VPWRGD(OL)

PWRGD

n Output Low Voltage

IPWRGDn = 1.6mA, VCC1 = 5V, VFBn = 0V,

●

0.14

0.4

Normal Cycle

tP(FC-GATE)

Fast Comparator Trip to GATE

VSENSEn = VCCn to (VCCn – 200mV) Step

●

1.5

µs

Discharging

tP(SC-FAULT)

Slow Comparator Trip to FILTER

VSENSEn = VCCn to (VCCn – 50mV) Step.

●

µs

High and FAULT Latched

FILTER Open

tP(FAULT-GATE)

FAULT Low to GATE

n Discharging

VFAULT = 3.3V to 0V

●

µs

tP(OV-GATE)

n OV Comparator Trip to GATEn

VFBn = 0V to 1V

●

µs

Discharging

tP(FILTER-GATE)

Filter Comparator Trip to GATE

VFILTER = 0V to 1.5V

●

µs

Discharging

tRESET

Circuit Breaker Reset Delay Time

VON1 < 0.4V to FAULT High

●

µs

tP(ON-GATE)

Turn Off Propagation Delay

VONn ≤ 0.821V to GATEn Discharging

●

µs

The

● indicates specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VCC1 = 5V, VCC2 = 3.3V, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of the device may be impaired.

Note 2: All current into device pins are positive. All voltages are referenced

to ground unless otherwise specified.

Note 3: An internal zener on each GATE pin clamps the charge pump

voltage to a typical maximum operating voltage of 26V. External overdrive

of either GATE pin beyond its internal zener voltage may damage the

device.

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