Datasheet

MAX5921/MAX5939
-48V Hot-Swap Controllers with External
R
SENSE
and High Gate Pulldown Current
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
EE
= 0V, V
DD
= 48V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.) (Notes 1, 4)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
PWRGD OUTPUT SIGNAL (REFERENCED TO DRAIN)
DRAIN Input Current I
DRAIN
V
DRAIN
= 48V 10 80 250 µA
DRAIN Threshold for PWRGD V
DL
V
DRAIN
- V
EE
threshold for power-good
condition, DRAIN decreasing
1.1 1.7 2.0 V
GATE High Threshold V
GH
∆V
GATE
- V
GATE
, decreasing 1.0 1.6 2.0 V
V
PWRGD
= 80V, V
DRAIN
= 48V 10
PWRGD, PWRGD Output
Leakage
I
OH
V
PWRGD
= 80V, V
DRAIN
= 0V 10
µA
PWRGD Low Voltage
(V
PWRGD
- V
EE
)
V
OL
V
DRAIN
- V
EE
< V
DL
, I
SINK
= 5mA
(A, E versions)
0.11
0.4 V
PWRGD Low Voltage
(V
PWRGD
- V
DRAIN
)
V
OL
V
DRAIN
= 5V, I
SINK
= 5mA (B, F versions)
0.11
0.4 V
OVERTEMPERATURE PROTECTION
Overtemperature Threshold
T
OT
(
TH
)
Junction temperature, temperature rising
135
°C
Overtemperature Hysteresis T
HYS
See Thermal Shutdown section 20 °C
AC PARAMETERS
OV High to GATE Low t
PHLOV
Figures 1a, 2 0.5 µs
UV Low to GATE Low t
PHLUV
Figures 1a, 3 0.4 µs
OV Low to GATE High t
PLHOV
Figures 1a, 2 3.3 µs
UV High to GATE High t
PLHUV
Figures 1a, 3 8.4 ms
SENSE High to GATE Low
t
PHLSENSE
Figures 1a, 4a 1 µs
A, B versions 0.35
0.5
0.65
Current Limit to GATE Low t
PHLCL
Time from continuous
current limit to GATE
shutdown (see Overcurrent
Fault Integrator section),
Figures 1b, 4b
E, F versions 1.4 2.0 2.6
ms
Figures 1a, 5a; A and E versions 8.2
DRAIN Low to PWRGD Low
DRAIN Low to (PWRGD - DRAIN)
High
t
PHLDL
Figures 1a, 5a; B and F versions 8.2
ms
Figures 1a, 5b; A and E versions 8.2
GATE High to PWRGD Low
GATE High to (PWRGD - DRAIN)
High
t
PHLGH
Figures 1a, 5b; B and F versions 8.2
ms
TURN-OFF
Latch-Off Period t
OFF
(Note 3)
A, B, E, F versions
128 x
t
PHLCL
ms
Note 1: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to V
EE
,
unless otherwise specified.
Note 2: Gate pulldown current after the current limit to GATE low (t
PHLCL
) time has elapsed.
Note 3: Minimum duration of GATE pulldown following a circuit breaker fault. The MAX5921_ automatically restarts after a circuit
breaker fault. The MAX5939_ is latched off and can be reset by toggling UV low. The GATE pulldown does not release until
t
OFF
has elapsed.
Note 4: The min/max limits are 100% production tested at +25°C and +85°C and guaranteed by design at -40°C.