Datasheet

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