MAX5968 Datasheet, PDF (1/26 Pages) Maxim Integrated Products – Circuit-Breaker and Ideal Diode Controller with Digital Monitoring Functions

19-5115; Rev 1; 2/10
Circuit-Breaker and Ideal Diode Controller
with Digital Monitoring Functions
General Description
The MAX5968 soft-switch and ideal diode controller pro-
tects systems with redundant DC-DC converter modules
against failure of the converter by controlling external
n-channel MOSFETs at the input and output of the con-
verter. Input short-circuit and overload current protection is
provided by means of a current-sense amplifier connected
to a sense resistor that resides at the source of the exter-
nal protection MOSFET. If a failure occurs at the input of
the associated converter, the MAX5968 protects the input
supply by pulling the gate of the input protection MOSFET
low and disconnecting the failed converter. Similarly, if
there is a failure at the output of the redundant converter,
the MAX5968 detects the reverse potential across the
output MOSFET and pulls the gate low to disconnect the
failed converter from the load. The MAX5968 features
VariableSpeed/BiLevelK input circuit-breaker protection.
The MAX5968 also integrates a 10-bit ADC that moni-
tors converter input current, load voltage, and output
MOSFET forward voltage. An analog input (ADCIN) is
provided to monitor a temperature signal from the asso-
ciated converter. The MAX5968 features two 10-bit cir-
cular buffers that contain a history of the 50 most recent
input current and output load voltage digital conversion
results. This data helps to diagnose and troubleshoot
converter failures. All ADC results, including circular buf-
fers and several configuration registers are accessible
through a 400kHz I²C interface.
Digital limits for overvoltage and undervoltage warning are
user programmable. An ALERT output notifies the system
controller of any failure condition that arises or requires
attention. When any of the measured signals violates digi-
tally programmable limits, the ALERT output is asserted.
A precision ON comparator input can be used to imple-
ment programmable undervoltage lockout for the input
and output MOSFET drivers.
An open-drain READY output can be used to enable
the associated DC-DC converter by releasing the con-
verter’s enable input when both the input and output
MOSFETs are fully enhanced.
Two general-purpose I/Os can be fully configured
through the I²C interface to provide external indications
or to control additional peripheral devices.
The MAX5968 is available in a 28-pin thin QFN package
and operates over the -40NC to +125NC temperature
range.
Features
S 10-Bit ADC for Temperature, Voltage, Output
MOSFET Forward Voltage, and Input Current
Monitoring
S Circular Buffers Store 50 Most Recent Voltage
and Current Values for Fault Transient Analysis
S Input Circuit-Breaker Controller Drives External
Low-Side n-Channel MOSFET
S Output Reverse-Current Protection Controller
Drives Parallel External n-Channel MOSFETs
S Programmable VariableSpeed/BiLevel Fault
Protection Provides Electronic Circuit-Breaker
Function
S Internal 4A Pulldown Current for Fast Shutdown
of the Circuit Breaker
S Internal 600mW Gate Drive for Fast On-Off Control
of the ORing FETs
S Minimum- and Maximum-Value Detection
Registers for All Digitized Signals
S Two GPIO Pins
S 400kHz I²C Interface
S Small, 5mm x 5mm, 28-Pin TQFN Package
Applications
Redundant DC-DC Converter Protection
Servers
High-Reliability Systems
Ordering Information
PART
MAX5968ATI+
TEMP RANGE
-40NC to +125NC
PIN-PACKAGE
28 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
VariableSpeed/BiLevel is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.