LTC4227
elecTrical characTerisTics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Hot Swap Control
l
l
∆V
∆V
∆V
∆V
Circuit Breaker Trip Sense Voltage
SENSE
47.5
60
50
65
52.5
70
mV
mV
SENSE(CB)
SENSE(ACL)
HGATE
+
–
(V
– V
)
SENSE
Active Current Limit Sense Voltage
+
–
(V
SENSE
– V
)
SENSE
l
l
External N-Channel Gate Drive
(V – V
IN < 7V, I = 0, –1µA
4.8
10
7
12
14
14
V
V
)
OUT
IN = 7V to 18V, I = 0, –1µA
HGATE
l
l
l
Gate-Source Voltage for Power Good
External N-Channel Gate Pull-Up Current Gate Drive On, HGATE = 0V
3.6
–7
4.2
–10
300
4.8
–13
500
V
µA
µA
HGATE(PG)
HGATE(UP)
HGATE(DN)
I
I
External N-Channel Gate Pull-Down
Current
Gate Drive Off
OUT = 12V , HGATE = OUT + 5V
150
l
l
I
t
t
External N-Channel Gate Fast Pull-Down Fast Turn-Off
Current OUT = 12V , HGATE = OUT + 5V
100
200
0.5
300
1
mA
µs
HGATE(FPD)
PHL(SENSE)
OFF(HGATE)
+
–
Sense Voltage (SENSE – SENSE )
High to HGATE Low
∆V = 300mV, C = 10nF
SENSE
HGATE
l
l
l
EN High to HGATE Low
20
10
10
40
20
20
µs
µs
µs
ON Low to HGATE Low
+
SENSE Low to HGATE Low
l
l
t
t
ON High, EN Low to HGATE Turn-On
LTC4227-1, LTC4227-2
LTC4227-3, LTC4227-4
50
0.8
100
1.6
150
2.4
ms
ms
D(HGATE)
P(HGATE)
Delay
l
ON to HGATE Propagation Delay
ON = Step 0.8V to 2V
10
20
µs
Input/Output Pin
+
+
+
l
l
l
l
I
I
SENSE Input Current
SENSE = 12V
1.2
50
2.2
100
2.05
90
mA
µA
V
SENSE
SENSE
–
–
–
SENSE Input Current
SENSE = 12V
10
1.75
10
+
+
+
V
SENSE Undervoltage Lockout
SENSE Rising
1.9
50
SENSE (UVL)
+
+
∆V
SENSE Undervoltage Lockout
mV
SENSE (HYST)
Hysteresis
l
l
l
l
l
l
l
l
l
l
V
ON Pin Threshold Voltage
ON Pin Hysteresis
ON Rising
1.21
40
1.235
80
1.26
140
0.65
1.26
1.22
140
1
V
mV
V
ON(TH)
∆V
ON(HYST)
ON(RESET)
D2ON(H,TH)
D2ON(L,TH)
V
V
V
ON Pin Fault Reset Threshold Voltage
D2ON Pin High Threshold
D2ON Pin Low Threshold
D2ON Pin Hysteresis
ON Falling
0.55
1.21
1.07
40
0.6
D2ON Rising
D2ON Falling
1.235
1.145
90
V
V
∆V
mV
µA
V
D2ON(HYST)
I
Input Leakage Current (ON, D2ON)
EN Pin Threshold Voltage
EN Pin Hysteresis
ON = D2ON = 5V
EN Rising
0
IN(LEAK)
V
1.185
40
1.235
110
–10
1.284
200
–13
EN(TH)
∆V
mV
µA
EN(HYST)
I
EN Pull-Up Current
EN = 1V
–7
EN(UP)
l
l
V
TMR Pin Threshold Voltage
TMR Rising
TMR Falling
1.198
0.15
1.235
0.2
1.272
0.25
V
V
TMR(TH)
l
l
l
I
I
I
I
TMR Pull-Up Current
TMR = 1V, In Fault Mode
TMR = 2V, No Faults
–75
1.4
1.4
–100
–125
2.6
µA
µA
%
TMR(UP)
TMR(DN)
TMR(RATIO)
OUT
TMR Pull-Down Current
2
2
TMR Current Ratio I
OUT Pin Current
/I
2.7
TMR(DN) TMR(UP)
l
l
OUT = 11V, IN = 12V, ON = 2V
OUT = 13V, IN = 12V, ON = 2V
50
1.9
100
4
µA
mA
l
V
Output Low Voltage (FAULT, PWRGD)
I = 1mA
0.15
0.4
V
OL
422712fa
4
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