MAX5970EVKIT+ Maxim Integrated, MAX5970EVKIT+ Datasheet - Page 12

• Manufacturer Part Number: MAX5970EVKIT+
• Description: Power Management IC Development Tools MAX5970 Eval Kit
• Manufacturer: Maxim Integrated
• Series: MAX5970r

Specifications of MAX5970EVKIT+

• Rohs: yes

MAX5970 Evaluation Kit
During startup, each hot-swap channel is enabled if the
respective EN2 bit is set to 1 and the ON_ input is high.
The EN2 bit is dependent on the state of the HWEN pin.
If the HWEN pin is pulled to DREG during startup, the
EN2 bit for both channels is set to 1. The EV kit circuit
provides jumper JU15 to configure the HWEN pin. See
Table 1 for jumper JU15 configuration. Connecting the
HWEN pin to GND after startup does not change the
EN2 bit state to 0. However, after startup, the EN2 bit
state for each channel can be changed using the EV kit
GUI software.
Whenever the ON_ pin voltage exceeds the input-voltage
threshold of 0.6V (typ), the ON_ bit is set to 1; otherwise,
it is set to 0. The EV kit circuit is configured to pull up the
ON_ pins to the respective VS_ channel inputs through
resistors R20 or R22. The VS_ input undervoltage thresh-
old can be modified by completing the resistive divider
at each ON_ pin. Use the following equation to select the
value for each ON_ resistor:
where VS_
input and R is the resistor value in ohms for R19 and R21,
respectively.
The EV kit circuit also provides jumpers JU13 and JU14
to connect the respective ON_ pins to GND, thus setting
the ON_ bit to 0. See Table 1 for jumpers JU13 and JU14
configuration.
Refer to the MAX5970 IC data sheet for detailed informa-
tion on enabling and disabling each hot-swap channel.
Depending on the state of the MODE input pin during
startup, the MAX5970 can operate as two independent
hot-swap controllers, or with both controllers together.
The EV kit circuit provides jumper JU5 to configure the
MODE pin. See Table 1 for jumper JU5 configuration.
Reconfiguring jumper JU5 after startup does not change
the initial setting.
The MAX5970 fault-protection mode is programmed dur-
ing startup depending on the PROT pin configuration.
The PROT pin configuration determines whether the PG_
output signal for the channel(s) is cleared or the PG_ out-
put is cleared and the channel(s) shut down. The EV kit
circuit provides jumper JU6 to configure the PROT pin.
12
_____________________________________________________________________________________
UVLO
is the desired VS1 or VS2 undervoltage
R
Grouping Hot-Swap Channels
=



Hot-Swap Channel Enable
VS_
0.6V
100k
UVLO
Ω
−
PROT and ALERT
1



See Table 1 for jumper JU6 configuration. Reconfiguring
JU6 after startup does not change the initial setting.
Once a PG_ output is asserted, the ALERT output signal
(red LED D5 or TP11) is always asserted low if any of the
channels’ output voltage is outside the warning or critical
limits, or when an overcurrent-limit fault is detected.
The MAX5970 power-good (PG_) output signals are
asserted when the output voltage is inside the undervolt-
age and overvoltage programmed limits. The PG_ output
signal polarity is programmed depending on the POL pin
configuration. If the signal polarity is set for active-high
outputs, the respective channel LEDs (D14 and D15) are
turned on when PG_ is asserted. If the signal polarity is
set for active-low outputs, the respective channel’s LED
is turned off when PG_ is asserted. The PG_ output sig-
nals can also be accessed at test points TP5 and TP7.
The EV kit circuit provides jumper JU4 to configure the
POL pin. See Table 1 for jumper JU4 configuration.
The MAX5970 FAULT_ output signal is asserted low
whenever a circuit-breaker channel shutdown event
occurs. A circuit-breaker shutdown event occurs when-
ever a fast-trip or slow-trip overcurrent-fault event is
detected. The respective channel LED (D12 and D13)
is turned on when the FAULT_ output is asserted. The
FAULT_ output signals can also be accessed at test
points TP6 and TP8. See the RETRY Configuration sec-
tion for instructions to clear the FAULT_ outputs.
The MAX5970 can be programmed to autoretry or
latch-off mode during startup depending on the RETRY
pin configuration. In autoretry mode, after a shutdown
event, the FAULT_ is cleared and the MAX5970 control-
ler automatically attempts to restart the corresponding
channel after 200ms. In latch-off mode, the channel is
in shutdown. The power at the IN pin must be cycled or
the affected channel’s ON_ pin, EN1 bit, or EN2 bit must
be toggled to restart the latched-off channel and clear
the FAULT_. The EV kit circuit provides jumper JU16 to
configure the RETRY pin. See Table 1 for jumper JU16
configuration. Reconfiguring JU16 after startup does not
change the initial RETRY setting. Refer to the MAX5970
IC data sheet when operating in autoretry mode.
RETRY Configuration
Power-Good Outputs
FAULT_ Outputs