Datasheet
3
LT4220
4220f
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
INFB
+
FB
+
Input Current FB
+
= 3V ● 0.09 ±1 µA
I
INFB
–
FB
–
Input Current FB
–
= –3V ● 0.08 ±1 µA
∆V
FB
+
H
FB
+
PWRGD Threshold Line Regulation V
CC
= 2.7V, V
EE
= –2.7V to V
CC
= 16.5V, V
EE
= –16.5V ● 0.015 0.15 mV/V
∆
VFB
–
H
FB
–
PWRGD Threshold Line Regulation V
CC
= 2.7V, V
EE
= –2.7V to V
CC
= 16.5V, V
EE
= –16.5V ● 0.05 0.5 mV/V
V
SENSE
+
SENSE
+
Trip Voltage (V
CC
– V
SENSE
+
)V
FB
+
= 0V, GATE
+
– 0.5V ● 61522 mV
V
FB
+
= 1V, GATE
+
– 0.5V 36 48 60 mV
V
SENSE
–
SENSE
–
Trip Voltage (V
SENSEK
– V
SENSE
–
)V
FB
–
= 0V, GATE
–
– 0.5V ● –10 –15 –22 mV
V
FB
–
= –1V, GATE
–
– 0.5V –43 –52 –61 mV
I
GATEUP
+
GATE
+
Pull-Up Current Charge Pump On, V
GATE
+
= 7V ● –9 –13 –17 µA
I
GATEUP
–
GATE
–
Pull-Up Current V
GATE
– = –3V ● –6 –10 –14 µA
I
GATEDN
+
GATE
+
Pull-Down Current Any Fault Condition, V
GATE
+
= 1V ● 20 40 60 mA
I
GATEDN
–
GATE
–
Pull-Down Current Any Fault Condition, V
GATE
–
= V
EE
+ 4V ● 30 70 130 mA
∆V
GATE
+
External N-Channel GATE
+
Drive V
GATE
+
– V
CC
, V
CC
= 2.7V, V
EE
= –2.7V ● 3.5 4 6 V
V
CC
= 5V to 16.5V, V
EE
= –5V to –16.5V 5 6.5 8 V
∆V
GATE
–
External N-Channel GATE
–
Drive V
GATE
–
– V
EE
, V
CC
= 2.7V, V
EE
= –2.7V ● 3.5 5.2 6 V
V
CC
= 5V to 16.5V, V
EE
= –5V to –16.5V 7.5 8.5 9 V
V
TIMERH
TIMER High Threshold, Sets FAULT ● 1.22 1.24 1.26 V
V
TIMERL
TIMER Low Threshold, Allows Restart ● 0.4 0.5 0.6 V
I
TIMERUP
TIMER Pull-Up Current TIMER = 0V ● –40 –65 –85 µA
I
TIMERDN
TIMER Pull-Down Current TIMER = 1V ● 2 3.3 4.5 µA
I
TIMER(R)
TIMER Current Ratio I
TIMERDN
/I
TIMERUP
57 %
V
OL
PWRGD Output Low Voltage I
O
= 2mA ● 0.3 V
I
O
= 5mA 0.5 V
I
OH
PWRGD Leakage Current V
PWRGD
= 16.5V ● 0.1 2 µA
V
FOL
FAULT Output Low Voltage I
O
= 2mA ● 0.3 V
I
O
= 5mA 0.5 V
I
FPH
FAULT Leakage Current V
FAULT
= 16.5V ● 0.06 2 µA
V
TRKTHR
TRACK Input Threshold ● 0.3 0.8 1.1 V
I
TRK
TRACK Input Current TRACK = 16.5V ● 0.05 2 µA
V
TRKFB
+
TRACK Mode FB
+
Threshold I
GATE
+
= 0µA, TRACK = V
CC
(Note 3) ● 40 70 mV
V
TRKFB
–
TRACK Mode FB
–
Threshold I
GATE
–
= 0µA, TRACK = V
CC
(Note 3) ● 40 80 mV
DC ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, V
EE
= –5V, unless otherwise noted.