Datasheet

LTC4218
3
4218ff
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
DD
= 12V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DC Characteristics
V
DD
Input Supply Range
l
2.9 26.5 V
I
DD
Input Supply Current FET On
l
1.6 5 mA
V
DD(UVL)
Input Supply Undervoltage Lockout V
DD
Rising
l
2.65 2.73 2.85 V
V
DD(UVTH)
Input Supply Undervoltage Threshold LTC4218-12 Only V
DD
Rising
l
9.6 9.88 10.2 V
ΔV
DD(UVHYST)
Input Supply Undervoltage Hysteresis LTC4218-12 Only
l
520 640 760 mV
V
DD(OVTH)
Input Supply Overvoltage Threshold LTC4218-12 Only V
DD
Rising
l
14.7 15.05 15.4 V
ΔV
DD(OVHYST)
Input Supply Overvoltage Hysteresis LTC4218-12 Only
l
183 244 305 mV
V
SOURCE(PGTH)
SOURCE Power Good Threshold LTC4218-12 Only V
SOURCE
Rising
l
10.2 10.5 10.8 V
ΔV
SOURCE(PGHYST)
SOURCE Power Good Hysteresis LTC4218-12 Only
l
127 170 213 mV
ΔV
SNS(TH)
Current Limit Sense Voltage Threshold
(V
SENSE
+
– V
SENSE
–
)
V
FB
= 1.23V
V
FB
= 0V
V
FB
= 1.23V, R
SET
= 20kΩ
l
l
l
14.25
2.8
6.7
15
3.75
7.5
15.75
4.7
8.325
mV
mV
mV
I
SENSE
–
(IN)
SENSE
–
Pin Input Current V
SENSE
–
= 12V
l
4 ±10 μA
I
SENSE
+
(IN)
SENSE
+
Pin Input Current V
SENSE
+
= 12V
l
5.5 ±20 μA
ΔV
GATE
External N-Channel Gate Drive
(V
GATE
– V
SOURCE
)
V
DD
= 2.9V to 26.5V (Note 3)
I
GATE
= 0, –1μA
l
5 6.15 6.5 V
ΔV
GATE-HIGH(TH)
Gate High Threshold (V
GATE
– V
SOURCE
)
l
3.5 4.2 4.8 V
I
GATE(UP)
External N-Channel Gate Pull-Up Current Gate Drive On, V
GATE
= V
SOURCE
= 12V
l
–19 –24 –29 μA
I
GATE(FST)
External N-Channel Gate Fast Pull-Down
Current
Fast Turn Off, V
GATE
= 18V,
V
SOURCE
=12V
l
100 170 220 mA
I
GATE(DN)
External N-Channel Gate Pull-Down Current Gate Drive Off, V
GATE
= 18V,
V
SOURCE
=12V
l
200 250 340 μA
Inputs
I
IN
OV, UV, FB Pin Input Current V
IN
= 1.2V, LTC4218 Only
l
0±1 μA
R
IN
OV, UV, FB Pin Input Resistance LTC4218-12 Only
l
13 18 23 kΩ
V
(TH)
OV, UV, FB Pin Threshold Voltage V
IN
Rising
l
1.21 1.235 1.26 V
ΔV
OV(HYST)
OV Pin Hysteresis
l
10 20 30 mV
ΔV
UV(HYST)
UV Pin Hysteresis
l
50 80 110 mV
V
UV(RTH)
UV Pin Reset Threshold Voltage V
UV
Falling
l
0.55 0.62 0.7 V
ΔV
FB(HYST)
FB Pin Power Good Hysteresis
l
10 20 30 mV
R
ISET
I
SET
Pin Output Resistor
l
19.5 20 20.5 kΩ
I
SOURCE
SOURCE Pin Input Current V
SOURCE
= V
GATE
= 12V, LTC4218-12 Only
V
SOURCE
= V
GATE
= 12V, LTC4218 Only
V
SOURCE
= V
GATE
= 0V
l
l
l
50
1
70
2
0
90
4
±1
μA
μA
μA
Outputs
V
INTVCC
INTV
CC
Output Voltage I = 0mA, 10mA 3.1 V
V
OL
PG, FLT Pin Output Low Voltage I
OUT
= 2mA
l
0.4 0.8 V
I
OH
PG, FLT Pin Input Leakage Current V
OUT
= 30V
l
0 ±10 μA
V
TIMER(H)
TIMER Pin High Threshold V
TIMER
Rising
l
1.2 1.235 1.28 V
V
TIMER(L)
TIMER Pin Low Threshold V
TIMER
Falling
l
0.1 0.21 0.3 V
I
TIMER(UP)
TIMER Pin Pull Up Current V
TIMER
= 0V
l
–80 –100 –120 μA
I
TIMER(DN)
TIMER Pin Pull-Down Current V
TIMER
= 1.2V
l
1.4 2 2.6 μA