The MAX6399 is a small overvoltage and undervoltage
protection circuit. The device can monitor a DC-DC output
voltage and quickly disconnect the power source
from the DC-DC input load when an overvoltage condition
occurs. A power-OK output signals when the
DC-DC input voltage falls below an adjustable threshold.
This controller architecture provides the ability to
size the external n-channel MOSFET to meet specific
load current requirements.
When the DC-DC monitored output voltage is below the
user-adjustable overvoltage threshold, the GATE output
of the MAX6399 goes high to enhance the n-channel
MOSFET. The MAX6399 offers internal charge-pump
circuitry that allows the GATE voltage to be 10V above
the input voltage (VGS = 10V) to fully enhance the
external n-channel MOSFET, thus minimizing the drain-to-
source resistance.
When the monitored output voltage rises above the
user-adjusted overvoltage threshold, the GATE output
rapidly pulls low to shut off the MOSFET. The MOSFET
remains latched off until either the MAX6399 input
power or SHDN-bar input is cycled. The MAX6399 includes
a logic-low shutdown input that disables the GATE. An
internal overtemperature detector also disables the
gate when the MAX6399 temperature reaches the thermal-shutdown threshold.
The device operates over a wide supply voltage range
(5.75V to 72V) and is offered in a small TDFN package,
fully specified from -40°C to +125°C.
Key Features
Applications/Uses
Wide Supply Voltage Range (5.75V to 72V)
Internal Charge Pump Ensures n-Channel
MOSFET is Fully Enhanced During Normal
Operation (VGS = 10V)
Fast GATE Shutoff During Overvoltage with 20mA
Sink Capability
Latches Off External n-Channel MOSFET During
High-Voltage Transients
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-4
of
4
MAX6399
Free Sample
Buy
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX6399ATA
THIN QFN (Dual);8 pin;
Dwg: 21-0137 (PDF)
Use pkgcode/variation: T833-2*
Download
E-Mail
