LTC4221CGN Ver la hoja de datos (PDF) - Linear Technology
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LTC4221CGN
Linear Technology
LTC4221CGN Datasheet PDF : 28 Pages
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LTC4221
ELECTRICAL CHARACTERISTICS 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.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
IGATE(UP)
GATEn Output Current
VON1 = VON2 = 2V, VGATEn = 0V
● –7
IGATE(DN)
GATEn Output Current
VON1 = VON2 = 0.6V, VGATEn = 3.3V
● 75
IGATE(FSTDN)
GATEn Output Current
UVLO with VGATEn = 3.3V or FAULT
Latched with VGATEn = 3.3V
ΔVGATE
External N-Channel Gate Drive
VGATEn – VCC1 for VCC1 = 2.7V, VCC2 = 1V ● 4.5
VGATEn – VCC1 for VCC1 = 3.3V, VCC2 = 2.5V ● 5
VGATEn – VCC1 for VCC1 = 5V, VCC2 = 3.3V ● 8
VGATEn – VCC1 for VCC1 = 12V, VCC2 = 12V ● 7
VGATE(OV)
GATEn Overvoltage Lockout Threshold
●
ION(IN)
ONn Pin Input Current
0V ≤ VONn ≤ VCC1
●
VON(RESET)
ON1 Reset Threshold
VON1 Falling
● 0.375
ΔVON(RESETHYST) ON1 Reset Threshold Hysteresis
VON(OFF)
ONn Off Threshold
High to Low, GATEn Turns Off by 100μA
Pull-Down
● 0.796
–9.5
100
16
0.4
±0.01
0.4
25
0.821
–12
125
13
16
16
18
0.5
±1
0.425
0.846
ΔVON(OFFHYST)
IFB(IN)
VFB(UV)
ΔVFB(UVHYST)
ΔVFB(LREG)
VFB(OV)
IFILTER(UP)
IFILTER(DN)
VFILTER(TH)
ΔVFILTER(HYST)
ITMR(UP1)
ITMR(UP2)
ITMR(FSTDN)
VTMR(H)
VTMR(L)
IFAULT(UP)
VFAULT(TH)
ΔVFAULT(HYST)
VFAULT(OL)
IPWRGD(LK)
VPWRGD(OL)
ONn Off Threshold Hysteresis
FBn Input Current
0V ≤ VFBn ≤ VCCn
●
FBn Undervoltage Threshold
FBn Falling
●
FBn Undervoltage Threshold Hysteresis
FBn Threshold Line Regulation
2.7V ≤ VCC1 ≤ 13.5V
FBn Overvoltage Threshold
FBn Rising
●
FILTER Pull-Up Current
During Current Fault Condition
●
FILTER Pull-Down Current
During Normal Cycle
●
FILTER Threshold
Latched Off Threshold, FILTER Rising
●
FILTER Threshold Hysteresis
TIMER Pull-Up Current 1
Initial Timing Cycle
●
TIMER Pull-Up Current 2
Start-Up Cycle
●
TIMER Pull-Down Current
TIMER High Threshold
VTIMER = 1.5V, End of Initial Timing Cycle
TIMER Rising
●
TIMER Low Threshold
TIMER Falling
●
FAULT Pull-Up Current
●
FAULT Threshold
FAULT Falling
●
FAULT Hysteresis
FAULT Output Low Voltage
PWRGDn Leakage Current
PWRGDn Output Low Voltage
IFAULT = 1.6mA, VCC1 = 5V
●
VPWRGDn = VCC1, VFBn = 0.7V, Normal Cycle ●
IPWRGDn = 1.6mA, VCC1 = 5V, VFBn = 0V,
●
Normal Cycle
0.605
0.805
–80
1.15
1.18
–1.2
–15
1.172
0.1
– 2.5
0.791
30
±0.01
0.617
3
2
0.822
–105
1.8
1.24
105
– 1.9
– 20
9
1.234
0.4
– 3.8
0.816
35
0.14
±0.01
0.14
±1
0.629
0.838
–132
2.45
1.30
– 2.6
– 25
1.27
0.5
–5
0.841
0.4
±10
0.4
tP(FC-GATE)
Fast Comparator Trip to GATEn
Discharging
VSENSEn = VCCn to (VCCn – 200mV) Step
●
1
1.5
tP(SC-FAULT)
Slow Comparator Trip to FILTER
High and FAULT Latched
VSENSEn = VCCn to (VCCn – 50mV) Step.
●
FILTER Open
15
35
UNITS
μA
μA
mA
V
V
V
V
V
μA
V
mV
V
mV
μA
V
mV
mV
V
μA
μA
V
mV
μA
μA
mA
V
V
μA
V
mV
V
μA
V
μs
μs
4221fa
3
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