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LTC4221
4221fa
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I
GATE(UP)
GATEn Output Current
V
ON1
 = V
ON2
 = 2V, V
GATEn
 = 0V
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">   7
9.5
12
糀
I
GATE(DN)
GATEn Output Current
V
ON1
 = V
ON2
 = 0.6V, V
GATEn
 = 3.3V
?/DIV>
75
100
125
糀
I
GATE(FSTDN)
GATEn Output Current
UVLO with V
GATEn
 = 3.3V or FAULT
16
mA
Latched with V
GATEn
 = 3.3V
擵
GATE
External N-Channel Gate Drive
V
GATEn
  V
CC1
 for V
CC1
 = 2.7V, V
CC2
 = 1V
?/DIV>
4.5
13
V
V
GATEn
  V
CC1
 for V
CC1
 = 3.3V, V
CC2
 = 2.5V    ?/SPAN>
5
16
V
V
GATEn
  V
CC1
 for V
CC1
 = 5V, V
CC2
 = 3.3V
?/DIV>
8
16
V
V
GATEn
  V
CC1
 for V
CC1
 = 12V, V
CC2
 = 12V
?/DIV>
7
18
V
V
GATE(OV)
GATEn Overvoltage Lockout Threshold
?/DIV>
0.4
0.5
V
I
ON(IN)
ONn Pin Input Current
0V d V
ONn
 d V
CC1
?/DIV>
?.01
?
糀
V
ON(RESET)
ON1 Reset Threshold
V
ON1
 Falling
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">    0.375
0.4
0.425
V
擵
ON(RESETHYST)
ON1 Reset Threshold Hysteresis
25
mV
 V
ON(OFF)
ONn Off Threshold
High to Low, GATEn Turns Off by 100糀
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">    0.796
0.821
0.846
V
Pull-Down
擵
ON(OFFHYST)
ONn Off Threshold Hysteresis
30
mV
I
FB(IN)
FBn Input Current
0V d V
FBn
 d V
CCn
?/DIV>
?.01
?
糀
V
FB(UV)
FBn Undervoltage Threshold
FBn Falling
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">    0.605
0.617
0.629
V
擵
FB(UVHYST)
FBn Undervoltage Threshold Hysteresis
3
mV
擵
FB(LREG)
FBn Threshold Line Regulation
2.7V d V
CC1
 d 13.5V
2
mV
V
FB(OV)
FBn Overvoltage Threshold
FBn Rising
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">    0.805
0.822
0.838
V
I
FILTER(UP)
FILTER Pull-Up Current
During Current Fault Condition
?/DIV>
80
105
132
糀
I
FILTER(DN)
FILTER Pull-Down Current
During Normal Cycle
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">    1.15
1.8
2.45
糀
V
FILTER(TH)
FILTER Threshold
Latched Off Threshold, FILTER Rising
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">    1.18
1.24
1.30
V
擵
FILTER(HYST)
FILTER Threshold Hysteresis
105
mV
I
TMR(UP1)
TIMER Pull-Up Current 1
Initial Timing Cycle
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">    1.2
1.9
2.6
糀
I
TMR(UP2)
TIMER Pull-Up Current 2
Start-Up Cycle
?/DIV>
15
20
25
糀
I
TMR(FSTDN)
TIMER Pull-Down Current
V
TIMER
 = 1.5V, End of Initial Timing Cycle
9
mA
V
TMR(H)
TIMER High Threshold
TIMER Rising
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">    1.172
1.234
1.27
V
V
TMR(L)
TIMER Low Threshold
TIMER Falling
?/DIV>
0.1
0.4
0.5
V
I
FAULT(UP)
FAULT Pull-Up Current
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">    2.5
3.8
5
糀
V
FAULT(TH)
FAULT Threshold
FAULT Falling
?SPAN class="pst LTC4221IGN-TRPBF_2345295_4">    0.791
0.816
0.841
V
擵
FAULT(HYST)
FAULT Hysteresis
35
mV
V
FAULT(OL)
FAULT Output Low Voltage
I
FAULT
 = 1.6mA, V
CC1
 = 5V
?/DIV>
0.14
0.4
V
I
PWRGD(LK)
PWRGDn Leakage Current
V
PWRGDn
 = V
CC1
, V
FBn
 = 0.7V, Normal Cycle   ?/SPAN>
?.01
?0
糀
V
PWRGD(OL)
PWRGDn Output Low Voltage
I
PWRGDn
 = 1.6mA, V
CC1
 = 5V, V
FBn
 = 0V,
?/DIV>
0.14
0.4
V
Normal Cycle
t
P(FC-GATE)
Fast Comparator Trip to GATEn
V
SENSEn
 = V
CCn
 to (V
CCn
  200mV) Step
?/DIV>
1
1.5
約
Discharging
t
P(SC-FAULT)
Slow Comparator Trip to FILTER
V
SENSEn
 = V
CCn
 to (V
CCn
  50mV) Step.
?/DIV>
15
35
約
High and FAULT Latched
FILTER Open
The ?/SPAN> indicates specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
 = 25?/SPAN>C. V
CC1
 = 5V, V
CC2
 = 3.3V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
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