Datasheet
3Maxim Integrated
Adjustable Overvoltage and Overcurrent
Protectors with High Accuracy
MAX14571/MAX14572/MAX14573
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 4.5V to 36V, T
A
= -40NC to +85NC, unless otherwise noted. Typical values are at V
IN
= 24V, R
ISET
. = 12kI, T
A
= +25°C.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INTERNAL FETs
Internal FET On-Resistance R
ON
I
LOAD
= 100mA, V
IN
R 8V
100 160
mI
Current-Limit Adjustment Range I
LIM
(Notes 5, 6) 0.7 4.2 A
Current-Limit Accuracy -15 +15 %
FLAG Assertion Drop Voltage
Threshold
V
FA
Increase (V
IN
- V
OUT
) drop until FLAG
asserts, V
IN
= 24V
560 mV
Reverse Current Blocking Threshold V
RIB
V
OUT
- V
IN
40 100 160 mV
Reverse Blocking Leakage Current I
RBL
V
OUT
- V
IN
> 160mV, current into OUT 400 600
FA
FLAG OUTPUT
FLAG Output Logic-Low Voltage
I
SINK
= 1mA 0.4 V
FLAG Output Leakage Current V
IN
= V
FLAG
= 5V, FLAG desasserted
2
FA
LOGIC INPUT
HVEN Threshold Voltage
V
HVEN_TH
1 2 3.5 V
HVEN Threshold Hysteresis
2 %
HVEN Input Leakage Current
I
HVEN_LEAK
V
HVEN
= 36V
26 40
FA
HVEN Input Reverse Leakage
Current
I
HVEN_RLEAK
V
IN
= V
HVEN
= -36V
-45 -27
FA
EN, RIEN Input Logic-High V
IH
1.4 V
EN, RIEN Input Logic-Low V
IL
0.4 V
EN, RIEN Input Leakage Current
I
EN_LEAK,
I
RIEN_LEAK
V
EN
= V
RIEN
= 5.0V -1 +1
FA
THERMAL PROTECTION
Thermal Shutdown T
JC_MAX
Low-to-high temperature 150
NC
Thermal-Shutdown Hysteresis T
JC_HYST
High-to-low temperature 30
NC
TIMING CHARACTERISTICS (Note 7)
Switch Turn-On Time t
ON
From OFF to IN, see Table 1. R
LOAD
=
240I, C
OUT
= 470FF
25 ms
Switch Turn-Off Time t
OFF
R
LOAD
= 47I
3
Fs
Overvoltage Switch Turn-Off Time t
OFF_OVP
V
IN
> V
OVLO
to V
OUT
= 80% of V
OVLO
,
R
LOAD
= 47I, R
SETI
= 10kI
3
Fs
Overcurrent Switch Turn-Off Time t
OFF_OCP
I
IN
> I
LIM
, after t
BLANK
, I
LIM
= 1A 3
Fs
IN Debounce Time t
DEB
V
IN
changes
from 0V to greater than
V
UVLO
to V
OUT
= 10% of V
IN
15.0 16.7 18.4 ms
Blanking Time t
BLANK
18.6 20.7 22.8 ms
Autoretry Time t
RETRY
After blanking time from I
OUT
> I
LIM
to
FLAG clear (deassertion) (Note 8)
540 600 660 ms