LTC4232
3
4232fc
For more information www.linear.com/LTC4232
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Inputs
I
IN
OV, UV, FB Input Current V = 1.2V
l
0 ±1 µA
V
TH
OV, UV, FB Threshold Voltage V
PIN
Rising
l
1.21 1.235 1.26 V
ΔV
OV(HYST)
OV Hysteresis
l
10 20 30 mV
ΔV
UV(HYST)
UV Hysteresis
l
50 80 110 mV
V
UV(RTH)
UV Reset Threshold Voltage V
UV
Falling
l
0.55 0.62 0.7 V
ΔV
FB(HYST)
FB Power Good Hysteresis
l
10 20 30 mV
R
ISET
I
SET
Internal Resistor
l
19 20 21 kΩ
Outputs
V
INTVCC
INTV
CC
Output Voltage V
DD
= 5V, 15V, I
LOAD
= 0mA, –10mA
l
2.8 3.1 3.3 V
V
OL
PG, F LT Output Low Voltage I
SINK
= 2mA
l
0.4 0.8 V
I
OH
PG, F LT Input Leakage Current V = 30V
l
0 ±10 µA
V
TIMER(H)
TIMER High Threshold V
TIMER
Rising
l
1.2 1.235 1.28 V
V
TIMER(L)
TIMER Low Threshold V
TIMER
Falling
l
0.1 0.21 0.3 V
I
TIMER(UP)
TIMER Pull-Up Current V
TIMER
= 0V
l
–80 –100 –120 µA
I
TIMER(DN)
TIMER Pull-Down Current V
TIMER
= 1.2V
l
1.4 2 2.6 µA
I
TIMER(RATIO)
TIMER Current Ratio I
TIMER(DN)
/I
TIMER(UP)
l
1.6 2 2.7 %
A
IMON
I
MON
Current Gain I
OUT
= 2.5A
l
18.5 20 21.5 µA/A
BW
IMON
I
MON
Bandwidth 250 kHz
I
OFF(IMON)
I
MON
Offset Current I
OUT
= 150mA
l
0 ±4.5 µA
I
GATE(UP)
Gate Pull-Up Current Gate Drive On, V
GATE
= V
OUT
= 12V
l
–18 –24 –29 µA
I
GATE(DN)
Gate Pull-Down Current Gate Drive Off, V
GATE
= 18V, V
OUT
= 12V
l
180 250 400 µA
I
GATE(FST)
Gate Fast Pull-Down Current Fast Turn Off, V
GATE
= 18V, V
OUT
= 12V 140 mA
AC Characteristics
t
PHL(GATE)
Input High (OV), Input Low (UV) to Gate Low
Propagation Delay
V
GATE
< 16.5V Falling
l
8 10 µs
t
PHL(ILIM)
Short-Circuit to Gate Low V
FB
= 0, Step I
SENSE
to 6A,
V
GATE
< 15V Falling
l
1 5 µs
t
D(ON)
Turn-On Delay Step V
UV
to 2V, V
GATE
> 13V
l
50 100 150 ms
t
D(FAULT)
UV Low to Clear Fault Latch Delay 1 µs
t
D(CB)
Circuit Breaker Filter Delay Time (Internal) V
FB
= 0V, Step I
SENSE
to 3A
l
1.3 2 2.7 ms
t
D(AUTO-RETRY)
Auto-Retry Turn-On Delay (Internal)
l
50 100 150 ms
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into pins are positive, all voltages are referenced to
GND unless otherwise specified.
Note 3: An internal clamp limits the GATE pin to a maximum of 6.5V
above OUT. Driving this pin to voltages beyond the clamp may damage the
device.
Note 4: This IC includes overtemperature protection that
is intended
to protect the device during momentar
y overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 5: T
J
is calculated from the ambient temperature, T
A
, and power
dissipation, P
D
, according to the formula:
T
J
= T
A
+ (P
D
• 46°C/W)
elecTrical characTerisTics
The l denotes those specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
DD
= 12V unless otherwise noted.
