Datasheet

MAX6495–MAX6499
72V, Overvoltage-Protection Switches/
Limiter Controllers with an External MOSFET
3
Maxim Integrated
Note 1: Specifications to T
A
= -40°C are guaranteed by design and not production tested.
Note 2: The MAX6495–MAX6499 power up with the external MOSFET in off mode (V
GATE
= GND). The external MOSFET turns on
t
START
after all input conditions are valid.
Note 3: For accurate overtemperature-shutdown performance, place the device in close thermal contact with the external MOSFET.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, C
GATE
= 6nF, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS MIN TYP MAX
UNITS
OVSET to GATE Propagation
Delay
t
OV
SET rising from V
TH
- 100mV to V
TH
+ 100mV
0.6 µs
UVSET to GATE, POKSET to
POK Propagation Delay
POKSET, UVSET falling from V
TH
+ 100mV to
V
TH
- 100mV
20 µs
V
OUTFB
= V
IN
= 5.5V, R
GATE
to IN = 1MΩ
V
IN
+ 3.4 V
IN
+ 3.8 V
IN
+ 4.2
GATE Output High Voltage V
OH
V
OUTFB
= V
IN
,
V
IN
≥ 14V, R
GATE
to IN = 1MΩ V
IN
+ 8 V
IN
+ 10 V
IN
+ 11
V
GATE sinking 15mA, OUTFB = GND 1
GATE Output Low Voltage V
OL
V
IN
= 5.5V, GATE sinking 1mA, OUTFB = GND
0.9
V
GATE Charge-Pump Current
I
GATE
GATE = GND 100 µA
GATE to OUTFB Clamp
Voltage
V
CLMP
12 18 V
IN to GATEP Output Low
Voltage
I
GATEP
_
SINK
= 75µA, I
GATEP
_
SOURCE
= 1µA 7.5 11.7 V
IN to GATEP Clamp Voltage
V
IN
= 24V, I
GATEP
_
SOURCE
= 10µA 12 18 V
SHDN, CLEAR Logic-High
Input Voltage
V
IH
1.4
SHDN, CLEAR Logic-Low
Input Voltage
V
IL
0.4
V
SHDN Input Pulse Width 7µs
CLEAR Input Pulse Width 0.5 µs
SHDN, CLEAR Input
Pulldown Current
SHDN is Internally pulled down to GND 0.6 1.0 1.4 µA
Thermal Shutdown (Note 3)
+160
°C
Thermal-Shutdown
Hysteresis
20 °C
POKSET to POK Delay
(MAX6497/MAX6498)
35 µs
V
IN
≥ 14V, POKSET = GND, I
SINK
= 3.2mA 0.4
POK Output Low Voltage
(MAX6497/MAX6498)
V
OL
V
IN
≥ 2.8V, POKSET = GND, I
SINK
= 100µA 0.4
V
POK Leakage Current
(MAX6497/MAX6498)
V
POKSET
= 14V 100 nA