MAX5921AEVKIT Maxim Integrated, MAX5921AEVKIT Datasheet - Page 4

• Manufacturer Part Number: MAX5921AEVKIT
• Description: Hot Swap & Power Distribution Evaluation Kit for the MAX5920 MAX5921 MAX5939
• Manufacturer: Maxim Integrated

Specifications of MAX5921AEVKIT

• Product: Controllers & Switches
• Supply Voltage - Max: 80 V
• Supply Voltage - Min: 20 V
• Operating Temperature Range: - 40 C to + 85 C
• Power Dissipation: 471 mW
• Supply Current: 0.7 mA

The MAX5921A EV kit features a push-button switch
SW1 to disable the EV kit output. When pressed, the
switch connects the UV pin of the MAX5921A IC to -VIN
and disables the EV kit output.
The SW1 switch can be used to reset latched faults when
the MAX5920_ or MAX5939_ hot-swap controllers have
been installed on the EV kit board. The reset command
can be issued immediately after a fault condition; how-
ever, the hot-swap controller does not restart until t
delay time has elapsed after the fault. Cycling the input
power also disables the output or clears latched faults.
The PWRGD output can be used as a status signal or
to enable an active-low power module after a hot inser-
tion. The PWRGD output signal is pulled to -VIN during
normal operation and pulled to +VIN during an under-
voltage or current-limit fault condition. When evaluat-
ing the MAX5921A EV kit with an external module,
remove resistor R7 and capacitor C4.
MAX5921A Evaluation Kit
Table 1. MAX5920/MAX5921/MAX5939 Hot-Swap Controllers
4
MAX5920_
MAX5921_
MAX5939_
_______________________________________________________________________________________
PART
OUTPUT SIGNAL
PWRGD, PWRGD
PWRGD, PWRGD
PWRGD, PWRGD
(MAX5920_ and MAX5939_)
Latch-Fault Management
Disable/Fault Reset
PWRGD Output
LATCHED/AUTORETRY
OFF
Autoretry
Latched
Latched
The GATE pin on the MAX5921_ controller drives the
gate pin of external MOSFET N1 high when the input
voltage is between the UVP and OVP thresholds and
the output current has not exceeded the current-limit
threshold. The GATE voltage is regulated at 13.5V
above -VIN and can be monitored with differential
oscilloscope probes connected across test point TP1
and -VIN. The MAX5921_ controller contains an internal
voltage clamp that ensures the GATE voltage never
exceeds 18V. If MOSFET N1 is replaced, the MOSFET
must have a V
The MAX5921A EV kit can also evaluate other versions of
the MAX5920, MAX5921, or MAX5939 hot-swap con-
trollers.
swap controllers that can be evaluated with the
MAX5921A EV kit board. Refer to the MAX5920 or
MAX5921/MAX5939 data sheets for detailed information
of these products. The MAX5921A must be removed and
replaced by the desired IC. Remove resistor R7 when
evaluating ICs with an active-high output signal. When
evaluating the MAX5921A EV kit with an external
module remove resistor R7 and capacitor C4.
Table
Evaluating MAX5920/MAX5921/MAX5939
0.5, 1, 2
0.5, 1, 2
0.5, 1, 2
GS
t
1 lists the features among the other hot-
LIM
rating of at least 20V.
(ms)
AUTORETRY DUTY CYCLE
GATE Pin Voltage
Hot-Swap Controllers
1/128, 1/64, 1/32
1/128
1/128