Datasheet

LTC4222
3
4222fb
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 12V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Supplies
V
DDn
Input Supply Range
l
2.9 29 V
I
DD1
V
DD1
Input Supply Current V
DD1
= 12V
l
0.85 1.25 mA
I
DD2
V
DD2
Input Supply Current V
DD2
= 12V, I
INTVCC
= 0mA
l
3 4.5 mA
V
DDn(UVL)
Input Supply Undervoltage Lockout V
DD
Rising
l
2.34 2.43 2.53 V
V
DDn(HYST)
Input Supply Undervoltage Lockout
Hysteresis
l
60 80 100 mV
INTV
CC
Internal Regulator Voltage I
INTVCC
= 0mA
l
3.15 3.3 3.45 V
INTV
CC(UVL)
INTV
CC
Undervoltage Lockout INTV
CC
Rising
l
2.55 2.64 2.73 V
INTV
CC(HYST)
INTV
CC
Undervoltage Lockout Hysteresis
l
35 50 65 mV
Current Limit and Circuit Breaker (Both Channels)
∆V
SENSE(TH)
Circuit Breaker Threshold (V
DD
– V
SENSE
)
l
47.5
48.75
50
50
52.5
51.25
mV
mV
∆V
SENSE
Current Limit Voltage (V
DD
– V
SENSE
) V
FB
= 1.3V
V
FB
= 0V
Start-Up Timer Expired
l
l
l
46
14
130
50
16.6
150
54
19
165
mV
mV
mV
t
D(OC)
OC Fault Filter
∆V
SENSE
= 100mV
l
10 20 30 µs
I
SENSE(IN)
SENSE
+
/SENSE
–
Pin Input Current V
SENSE
= 12V
l
0 20 45 µA
Gate Drive
∆V
GATE
External N-Channel Gate Drive
(V
GATE
– V
SOURCE
) (Note 3)
V
DD
= 2.9V to 29V
l
4.7 5.9 6.5 V
I
GATE(UP)
External N-Channel Gate Pull-Up Current Gate On, V
GATE
= 0V
l
–8 –12 –18 µA
I
GATE(DN)
External N-Channel Gate Pull-Down Current Gate Off, V
GATE
= 15V
l
0.8 1 2.0 mA
I
GATE(LIM)
Pull-Down Current from GATE to SOURCE
During OC/UVLO
V
GATE
= 15V, (V
DD
– V
SENSE
)n = 200mV 450 mA
t
PHL(SENSE)
(V
DD
– SENSE) High to GATE Low V
DD
– SENSE = 200mV, C
GATE
= 10nF
l
0.5 1 µs
V
GS(POWERBAD)
(GATE-SOURCE) Voltage for Power Bad Fault V
SOURCE
= 2.9V to 29V
l
3.8 4.3 4.7 V
Comparator Inputs
V
INPUT(TH)
CONFIG, EN, FB, ON, OV and UV Input
Threshold
V
IN
Rising
l
1.215 1.235 1.255 V
∆V
CONFIG,EN,ON(HYST)
CONFIG, EN, ON Hysteresis
l
80 128 180 mV
∆V
FB(HYST)
FB Power Good Hysteresis
l
2 7 20 mV
∆V
OV(HYST)
OV Hysteresis
l
16 24 32 mV
∆V
UV(HYST)
UV Hysteresis
l
60 90 110 mV
I
(IN)
CONFIG, FB, ON, OV and UV Input Current V
IN
= 3V
l
0 ±1 µA
I
EN(UP)
EN Pull-Up Current V
EN
= 0V
l
5 10 20 µA
V
UV(RTH)
UV Reset Threshold Voltage V
UV
Falling
l
0.36 0.4 0.46 V
∆V
UV(RHYST)
UV Reset Threshold Hysteresis
l
60 125 180 mV
V
GPIO(TH)
GPIO Input Threshold V
GPIO
Rising
l
0.8 1 1.2 V