Datasheet

LTC4280
3
4280f
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
Supplies
V
DD
Input Supply Range
l
2.9 15 V
V
OV(VDD)
Input Supply Overvoltage Threshold
l
15 15.6 16.5 V
I
DD
Input Supply Current
l
35 mA
V
DD(UVL)
Input Supply Undervoltage Lockout V
DD
Rising
l
2.75 2.84 2.89 V
V
DD(HYST)
Input Supply Undervoltage Lockout Hysteresis
l
75 100 125 mV
INTV
CC
Internal Regulator Voltage V
DD
≥ 3.3V
l
2.9 3.1 3.4 V
INTV
CC(UVL)
INTV
CC
Undervoltage Lockout INTV
CC
Rising
l
2.55 2.64 2.79 V
INTV
CC(HYST)
INTV
CC
Undervoltage Lockout Hysteresis
l
20 55 75 mV
Current Limit and Circuit Breaker
∆V
SENSE(TH)
Circuit Breaker Threshold (V
DD
– V
SENSE
)
l
22.5 25 27.5 mV
∆V
SENSE
Current Limit Voltage (V
DD
– V
SENSE
)V
FB
= 1.3V
V
FB
= 0V
l
l
22.5
7
26
10
29.5
13.5
mV
mV
I
SENSE(IN)
SENSE +/– Input Current
V
SENSE
= 12V
l
10 20 35 µA
Gate Drive
∆V
GATE
External N-Channel Gate Drive (V
GATE
– V
SOURCE
)
(Note 3)
V
DD
= 2.9V to 15V
l
4.7 5.9 6.5 V
I
GATE(UP)
External N-Channel Gate Pull-Up Current Gate On, V
GATE
= 0V
l
–15 –20 –30 µA
I
GATE(DN)SLOW
External N-Channel Gate Pulldown Current Gate Off, V
GATE
= 15V
l
0.8 1 1.6 mA
I
GATE(DN)FAST
Pulldown Current From GATE to SOURCE
During OC/UVLO
V
DD
– SENSE = 100mV, V
GS
= 4V
l
300 450 700 mA
t
PHL(SENSE)
(V
DD
– SENSE) High to GATE Low V
DD
– SENSE = 100mV, C
GS
= 10nF
l
0.5 1 µs
V
GS(POWERBAD)
Gate-Source Voltage for Power Bad Fault V
SOURCE
= 2.9V – 15V
l
3.8 4.3 4.7 V
Comparator Inputs
V
ON(TH)
ON Pin Threshold Voltage V
ON
Rising
l
1.210 1.235 1.26 V
∆V
ON(HYST)
ON Pin Hysteresis
l
60 128 180 mV
I
ON(IN)
ON Pin Input Current V
ON
= 1.2V
l
0
±1
µA
V
EN(TH)
EN Input Threshold V
EN
= Rising
l
1.215 1.235 1.255 V
∆V
EN(HYST)
EN Hysteresis
l
50 128 200 mV
I
EN
EN Pin Input Current EN = 3.5V
l
0
±1
µA
V
OV(TH)
OV Pin Threshold Voltage V
OV
Rising
l
1.215 1.235 1.255 V
∆V
OV(HYST)
OV Pin Hysteresis
l
10 30 40 mV
I
OV(IN)
OV Pin Input Current V
OV
= 1.8V
l
0
±1
µA
V
UV(TH)
UV Pin Threshold Voltage V
UV
Rising
l
1.215 1.235 1.255 V
∆V
UV(HYST)
UV Pin Hysteresis
l
60 80 100 mV
I
UV(IN)
UV Pin Input Current V
UV
= 1.8V
l
0
±1
µA
V
UV(RTH)
UV Pin Reset Threshold Voltage V
UV
Falling
l
0.33 0.4 0.47 V
∆V
UV(RHYST)
UV Pin Reset Threshold Hysteresis
l
60 125 210 mV
V
FB
Foldback Pin Power Good Threshold FB Rising
l
1.215 1.235 1.255 V
∆V
FB(HYST)
FB Pin Power Good Hysteresis
l
3815 mV
I
FB
Foldback Pin Input Current FB = 1.8V
l
0
±1
µA
V
GPIO(TH)
GPIO Pin Input Threshold V
GPIO
Rising
l
0.8 1 1.2 V