MAX6397EVKIT Maxim Integrated, MAX6397EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX6397EVKIT
• Description: Supervisory Circuits Evaluation Kit for the MAX6397
• Manufacturer: Maxim Integrated
• Series: MAX6397, MAX6398r

Specifications of MAX6397EVKIT

• Number Of Voltages Monitored: 1
• Undervoltage Threshold: 1.181 V
• Overvoltage Threshold: 1.248 V
• Supply Voltage - Max: 72 V
• Supply Current (typ): 118 uA
• Supply Voltage - Min: 5.5 V

The MAX6397 EV kit is fully assembled and tested. Follow
these steps to verify operation. Do not turn on the
power supply until all connections are completed.
1) Connect a DC power supply (0 to 20V or above, 5A
2) Connect a voltmeter or oscilloscope and a load (if
3) Make sure the J2 shunt connects pins 1 and 2 (over-
4) Turn on the power supply and increase the input volt-
5) The above steps can be followed for a power supply
6) Check the linear regulator output and POK signal.
The MAX6397 EV kit demonstrates a high-voltage over-
voltage protection circuit for automotive applications
that must survive load dump and high-voltage transient
conditions. This EV kit can be configured in overvoltage
mode or overvoltage limiter mode by setting jumper J2
(see Table 1 for the jumper settings), and can supply
up to 5A of output current.
MAX6397 Evaluation Kit
Note: Indicate you are using the MAX6397 when contacting these manufacturers.
2
AVX
Central Semiconductor
Diodes Inc.
ECS
Epcos
International Rectifier
Murata
ST Microelectronics
TDK
Vishay
or depending on load) to VIN1 and GND.
desired) to OUT and GND.
voltage-protect mode). The J4 shunt should connect
pins 1 and 2.
age. The output turns on when the input voltage
reaches 5.5V. Increase the supply voltage further; the
output turns off when the input voltage reaches 17V.
connected to VIN2 or VIN3. The thresholds for turn
on and turn off for inputs VIN2 and VIN3 are higher
due to the voltage drop across the reverse-battery
protection.
_______________________________________________________________________________________
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Detailed Description
602-678-0384
516-435-1110
805-446-4800
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847-390-4373
402-563-6866
PHONE
Quick Start
602-678-0385
516-435-1824
805-446-4850
714-894-1858
732-603-5935
310-322-3332
770-436-3030
408-452-1549
847-390-4428
402-563-6296
The MAX6397 EV kit has three positive power-supply
inputs: VIN1, VIN2, and VIN3. Inputs VIN2 and VIN3
have diode-based and p-channel MOSFET-based
reverse-battery protections, respectively, and VIN1
bypasses all reverse-battery protections.
In overvoltage mode, the MAX6397 monitors the input
voltage and turns off the series-pass n-channel
MOSFET (M1) when the input voltage exceeds the pro-
grammed threshold voltage. As soon as the input volt-
age drops below the overvoltage threshold, the
MAX6397 charge pump fully enhances MOSFET M1 to
turn the output back on. The voltage-divider formed by
R1 and R2 sets the threshold voltage. The resistors pro-
vided in the MAX6397 EV kit set the threshold at 17V. If
inputs VIN2 or VIN3 are used, this threshold is higher
due to the voltage drop in D1 or M2.
The overvoltage threshold can be adjusted by varying
R1 or R2 using the equation below:
where V
maintain threshold accuracy, R2 must be less than
250kΩ. Since the EV kit ships with R2 set at 49.9kΩ,
use the formula above to change the threshold by
changing R1 only.
In overvoltage limiter mode, the MAX6397 monitors the
output voltage instead of the input voltage. The output
voltage is sensed through the same voltage-divider
FAX
OV
is the desired overvoltage threshold. To
R
www.avx.com
www.centralsemi.com
www.diodes.com
www.ecsconn.com
www.epcos.com
www.irf.com
www.murata.com
www.st.com
www.component.tdk.com
www.vishay.com
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Component Suppliers
1 215
Overvoltage Limiter Mode
V
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OV
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Overvoltage Mode
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